SC DrillTechSOLIDS CONTROL · DWM ← Main site

SC DRILLTECH · KNOWLEDGE LIBRARY

Engineering Knowledge Library

Now 321 technical articles across the solids-control & drilling-waste library — grounded in API RP 13C, 13B & 13D, growing continuously.

Solids control, drilling fluids and drilling-waste management — the complete field-tested library including the Mud Plants & Bulk mega-guide, the working knowledge behind the train, written from 26+ years on the rig.

Newsletter 2

SC DrillTech Monthly — August 2026 industry briefing

The global solids-control and drilling-waste news that matters: market, technology, contracts and regulation, filtered for the field…

Browse all 16 weekly issues →

The full field series, one theme at a time — solids control, drilling fluids, waste management, optimize & audit.

Engineering Calculations 57

Backreaming & hole cleaning

Backreaming can clear a cuttings bed that won't move any other way — but it risks pack-off, swabbing and overpull, and dumps the bed on the shaker as a slug. When it helps and when it hurts.

Hole-cleaning sweeps

High-vis sweeps clean vertical holes but channel over the bed in deviated wells. The tandem sweep — low-vis to erode, then weighted to lift — is the deviated answer. Why sweeps need rotation, and why the shaker reads them.

Swab & surge pressures

Swab (pulling pipe) drops bottomhole pressure toward a kick; surge (running in) raises it toward a fracture. Why high solids and gel strength make both worse, and why conditioning the mud before tripping is a solids job.

Torque & drag from solids

Rising torque and drag is often a solids problem the shaker sees first. How cuttings beds add to the string's friction factor, and why torque and drag is the early warning before pack-off and stuck pipe.

The true cost of poor solids control

Poor solids control bills you five ways: dilution, disposal, pump and bit wear, lost ROP, and ECD-driven losses. Why the system that looks cheapest is quietly the most expensive on the rig.

Owned vs rented solids control

Own the equipment or rent it with a service crew? The trade-offs, and why the real cost isn't the rental line but whether the equipment is operated to perform. A decision guide.

Dilution ratio & dilution factor

Dilution factor (API RP 13C) is the dilution you needed versus what you'd need with no removal system — a scorecard for solids-control performance. The definition, the dilution-volume formula, and a worked example.

Solids-control cost per foot

Cost per foot turns solids control into a measurable performance number. What goes into it, why mechanical removal beats dilution barrel for barrel, and how a good system saves six figures a well.

When to run a centrifuge

On unweighted mud, run it high-G to strip fine solids cyclones can't catch. On weighted mud, run it low-G to recover barite, not throw it away. A decision guide for when the centrifuge earns its place.

Barite alternatives

Hematite (SG ~5.0), ilmenite (~4.6) and Micromax (~4.8) vs API barite (4.1-4.2). Their specific gravities, the abrasion and iron trade-offs, and what a higher-gravity weighting material means for solids control.

Riserless mud recovery (RMR)

RMR uses a subsea pump to return top-hole mud and cuttings to the rig instead of dumping them on the seabed — turning the one section with no solids control into a full solids-control operation.

MPD and solids control

In managed pressure drilling the mud is a pressure medium managed to the psi — so drilled solids that shift its density and rheology threaten the pressure window. Why solids control becomes a well-control function in MPD.

Average specific gravity of solids (ASG)

On weighted mud, percent solids hides what matters. ASG splits barite from drilled solids using only mud weight and the retort. The formula, a worked example, and why a falling ASG warns of drilled solids.

Hole cleaning in horizontal wells

In a horizontal well cuttings fall to the low side and build beds. Why 30-60° is the dangerous angle, why annular velocity alone won't clear a bed, and why pipe rotation is the real lever.

LCM and shaker screens

LCM must stay in the mud to seal losses, but most is too coarse to pass the screen. Why bypassing shakers to keep it builds ECD and makes losses worse — and what to do instead.

The solids-control mass balance

Drilled-solids removal is a mass balance, not an equipment reading. Every barrel of solids has four destinations — out with cuttings, out by dilution, retained, or left downhole. How to close the balance.

Barite recovery by centrifuge

On weighted mud you can't remove all solids without discarding barite. Two centrifuges in series — a low-speed one recovers barite, a high-speed polisher strips fine drilled solids. How the density split works.

Gel strength explained

Gel strength is what suspends cuttings and barite when the pumps stop — but too much spikes the pressure to break circulation. 10-second vs 10-minute gels, flat vs progressive, and how solids drive them.

Barite sag is weighting material settling out of the mud; driven by low shear-rate viscosity and deviated holes.

The API sand content test

The fastest field check of the coarse abrasive fraction — the volume percent of solids larger than 74 microns.

Screen blinding vs plugging

A flooding shaker screen has plugged or blinded — same symptom, opposite fixes. A wedged near-size particle vs a film plastered over the mesh, and how to correct each.

Solids-control equipment order

The solids-control train has one correct sequence — shaker, degasser, desander, desilter, centrifuge — each removing finer solids. Why the order protects the system and where the degasser goes.

Shale shaker G-force explained

G-force is the engine of shaker separation: G = N²A/π²g, scales with RPM squared; the trade-off with screen life.

How a hydrocyclone works

A hydrocyclone turns feed pressure into a vortex — coarse solids out the apex, clean fluid out the vortex finder.

Equivalent circulating density (ECD)

ECD is mud weight plus annular friction — where solids control meets well integrity via PV.

Drill cuttings vs drilled solids

Drill cuttings and drilled solids come from the same bit but have opposite fates: cuttings are removed at surface on the first pass; drilled solids are the finer fraction that stays in the mud and degrades. Why the distinction decides your strategy.

How a decanter centrifuge works

A decanter centrifuge is the final mechanical stage: a bowl and scroll turning at a differential speed throw fine solids to the wall above 1,000 G. The two levers that tune it — pool depth and differential speed.

Retort analysis explained

The retort measures oil, water and solids — but the number that counts is the low-gravity-solids split hidden inside. How to read a retort and split the solids the way it actually matters. A 12.0 ppg mud at 20% solids carries ~12.5% LGS.

API screen number vs mesh

A screen's mesh count describes its weave; its API Screen Number (RP 13C) describes what it separates — the D100 cut point. Two same-mesh screens can cut differently. Select on the API number and conductance, not mesh.

Mud cleaner: when to use it

A mud cleaner is desilter cones over a fine screen, built to recover barite on weighted mud. Above ~10.5 ppg a bare desilter dumps barite. When it pays — and when a fine-screen shaker beats it.

Sizing a hydrocyclone bank

Size the bank to process 100%+ of the flow into its suction tank, not the circulation rate. 10" desander ~500 gpm, 4" desilter ~60 gpm at 75 ft head, plus 100 gpm backflow.

OBM vs SBM vs WBM solids control

The mud type sets the strategy: cheap WBM runs the full aggressive train; expensive OBM/SBM drop the cyclones for fine screens and a high-speed centrifuge to save the base fluid.

Vertical cuttings dryer: the basics

Cuttings leave the shaker >12% oil. A vertical dryer (high-G screen centrifuge) recovers base fluid and drops OOC below ~5%.

Cuttings re-injection (CRI) basics

CRI grinds cuttings into slurry and injects it below a fracture — permanent, contained, zero-discharge disposal. The full chain.

Zero-discharge solids control

Zero discharge = nothing to the environment. The waste streams, the routes (dryer/CRI/haul), and why solids control decides the cost.

Cyclone roping: field decision tree

Spray is the target, rope is the fault. Confirm head, then offload upstream, open the apex, add cones — not just crank pressure.

Centrifuge wet-cake troubleshooting

A sloppy cake = not enough force/time on the beach. Work bowl speed, feed rate, pond depth in order to dry it without losing the cut.

Top shale-shaker operating mistakes

The shaker sets the load on everything downstream. Flooded, wrong screen, wrong angle, bypass, poor tension, uneven feed — each fix.

High LGS: root-cause decision tree

Above ~10% LGS the fluid is untreatable. A decision tree that separates a mechanical bypass from an ultrafine overload before you burn mud.

Runaway dilution cost

Runaway dilution is a removal-efficiency problem, not chemistry. Because dilution costs 3–4× the volume, a few points move six figures.

Daily solids-control checklist

A tour-by-tour round — shakers, cyclones, centrifuge, mud report, discard — that catches a stage dropping out before the retort does.

How often to change shaker screens

Screen life runs 20 hrs to 22 days — but it's condition, not the clock. The four signals that say change now.

What micron does a desilter remove?

A desilter removes ~15–44 micron solids with small 4–5in cones — finer than a desander, coarser than a centrifuge.

Linear vs balanced-elliptical shakers

Linear: high-G, dry cuttings, more screen wear. Elliptical: gentler (3–4.5G), longer screen life, beats blinding in gumbo.

What is a good solids-removal efficiency?

SRE runs 60–90%; above 70% is good, above 85% very good — held without dumping expensive mud. Benchmarks explained.

Drilled-solids generation rate

Calculate how fast the bit makes solids — from hole size, ROP and porosity — to size the train and read removal efficiency.

Normal drilled-solids percentage

Low-gravity drilled solids should stay below ~5% by volume. What's normal, how the retort splits it, and why 2 points move rig days.

Oil–water ratio (OWR) from the retort

OWR straight from retort data — the ratio that sets emulsion stability on oil-based mud, with a worked example. API RP 13B-2…

Chloride & salinity by titration

Chloride and NaCl salinity from a silver-nitrate titration — the formula, strength factors and a worked example. API RP 13B-1…

Alkalinity Pf, Mf & lime content

What Pf, Mf and Pm mean, carbonate vs bicarbonate, and lime content as 0.26(Pm − Fw·Pf) — worked example. API RP 13B-1…

LGS vs HGS from one retort

Split total retort solids into drilled solids and barite by a mud-weight material balance at SG 2.6 and 4.2…

Stokes' Law settling velocity

Why fine drilled solids won't settle in a pit — and why the shaker and centrifuge, not gravity, must remove them…

Decanter Centrifuge G-Force and RCF: Calculation, Meaning and Field Limits

Calculate centrifuge RCF from bowl radius and RPM, distinguish RCF from speed, and interpret its practical drilling-fluid limits.

Lag time & bottoms-up

Annular volume ÷ pump output — tie the cuttings on your shaker back to the depth they actually came from…

Cuttings volume generated

How much solid a hole section really makes — hole capacity × interval × (1−porosity), the solids-control and waste load…

Annular velocity & carrying capacity

AV = 24.5·Q/(Dh²−Dp²) and the transport ratio — hole cleaning vs the solids load hitting your shakers…

Drilling-waste disposal cost

Turn cuttings volume into a disposal cost — bulk dry cuttings for retained fluid, then × the haul-and-treat rate…

Equipment Performance & Optimization 11

Feed-pump TDH & system head curve

Total dynamic head, the system curve, and where a feed pump actually runs — so your cyclones get their design head. Worked example.

Vertical cuttings dryer & ROC

How a vertical cuttings dryer strips base oil off OBM/SBM cuttings, what retention-on-cuttings (ROC) means, and the recovery it delivers.

Shaker deck angle & conveyance

How deck angle trades fluid throughput against cuttings conveyance, why +3° is the ceiling, and reading the pool and beach to set it.

Centrifuge Bowl Tip Speed and Wear: The Mechanical Limit Behind G-Force

Calculate decanter bowl tip speed, relate it to RCF and hoop stress, and manage feed-zone, scroll and discharge wear in abrasive drilling-fluid service.

Screen blinding & near-size particles

Why shakers plug: near-size particles wedge and blind screens. Plugging vs blinding, and the opposite fixes for each.

Feed-pump NPSH & cavitation

The silent killer of cyclone and centrifuge feed. Calculate NPSH available and stop starving your pumps. Worked example.

Sizing hydrocyclone banks by cone count

How many desander/desilter cones you actually need: 100–125% of suction flow ÷ per-cone capacity, with feed-head target.

Pump affinity laws

Flow scales with speed, head with the square, power with the cube. Tune feed head without tripping the motor. Worked example.

Centrifuge sizing by sigma (Σ)

The equivalent settling area that scales a centrifuge from pilot to field. The tubular-bowl formula and the Q/Σ scale-up law.

Vacuum degasser & gas-cut mud

Why a 50% surface density cut is only ~3% at bottomhole, when to reach for the degasser vs weighting up. Grounded in JPT.

Agitator sizing & tank turnover

Sizing mud-tank agitators by turnover rate so barite and drilled solids stay suspended instead of sagging. Worked TOR example.

Shale, Stability & Equipment Efficiency 5

Shale dispersion (hot-roll recovery)

Measure shale reactivity with %R = W1/W0 — and why dispersed shale dumps fines your shakers can't catch. Hot-roll recovery test.

Shale accretion & bit balling

The accretion bar test, the accretion % formula, and why sticky clay wrecks ROP, torque and the solids reaching surface.

Drilled solids, ECD & the stability window

How weak solids control raises ECD until it crosses the fracture gradient and the section starts losing mud. Grounded in API RP 59.

Centrifuge recovery efficiency

The solids mass balance that tells you what RPM won't: how much of the feed solids actually left in the cake.

Shale shaker capacity & solids loading

Match screen throughput to flow and solids rate — and why reactive-shale cavings surges flood the deck.

Mud Plants & Bulk Systems 42

★ Complete guide — start here

The full Mud Plants & Bulk pillar: 41 articles across 11 clusters — storage, mixing, bulk, transfer, reconditi…

Open the hub →

Inside a liquid mud plant

A map of the liquid mud plant (LMP): the bulk-silo side, the mixing system, the segregated…

What a mud plant does that the rig can't

Why drilling-fluid operations are centralised at a liquid mud plant rather than handled at…

The supply base & offshore logistics

How a liquid mud plant fits the offshore supply base: the flow of bulk and fluids between…

Mud plant layout & plot plan

How a liquid mud plant is zoned and laid out: the plot plan that separates bulk, mixing,…

Storage tank farm & segregation

How a mud plant stores finished and in-process fluids: the segregated tank farm with…

Agitation: keeping mud uniform

Why stored drilling mud must be continuously agitated: the physics of barite settling,…

Base oil & brine storage

How a mud plant stores base oil and clear brines: hydrocarbon vapour, flash point and fire…

The mixing & shearing system

How a mud plant mixes and shears drilling fluid: jet hoppers and eductors for wetting and…

Jet hoppers & eductors

How jet hoppers and eductors disperse additives into drilling fluid: the venturi principle…

Building & weighting a mud system

How a mud plant builds and weights a drilling-fluid system: starting from base fluid,…

Bulk silo systems

How a mud plant stores and meters dry bulk: the pressure silo and aerated cone, the rotary…

Pneumatic conveying & weighing

How a mud plant conveys and weighs dry bulk: dense-phase versus dilute-phase pneumatic…

Dust collection & control

How a mud plant controls dust: bin vents on silos, central baghouses and filter-receivers…

Barite & bentonite handling

How a mud plant handles barite and bentonite: bulk receipt and silo storage, the cohesive…

Bulk transfer to/from vessels

How dry bulk is transferred between a mud plant and a supply vessel: dense-phase conveying…

Liquid mud transfer operations

How a mud plant moves liquid fluids in operation: tank-to-tank and tank-to-vessel…

Vacuum units & recovery

How a mud plant recovers spilled and residual fluid: vacuum units that lift dirty fluid…

Ship-to-shore transfer operations

How fluids and bulk are transferred between a mud plant and a supply vessel: the ship-shore…

Transfer line cleaning & pigging

How a mud plant clears transfer lines between fluids: why the heel contaminates the next…

Reconditioning returned mud

How a mud plant reconditions mud returned from the well: removing accumulated low-gravity…

Solids removal at the plant

How a mud plant removes drilled solids from returned fluid: shale shakers for the coarse…

Slops collection & segregation

How a mud plant collects and segregates slops: capturing line flushes, sump and bund…

Drilling waste at the supply base

How drilling waste is handled at the supply base: receiving back-loaded cuttings and waste…

Wash water & effluent management

How a mud plant manages wash water and effluent: capturing deck and equipment wash-down,…

The mud plant laboratory

What the mud plant laboratory does: the API RP 13B tests it runs — density, rheology, fluid…

Quality control before supply

How a mud plant assures quality before fluid leaves: confirming each batch against the…

Mud plant HSE & hazardous areas

The HSE essentials of a liquid mud plant: hazardous-area classification and ignition…

Spill containment & environmental

How a mud plant prevents and contains spills: bunding and secondary containment sized to a…

Confined space & safe handling

Two everyday mud-plant hazards: confined-space entry into tanks and silos with permits,…

Tank farm design & bunding

How a mud plant's storage tank farm is designed: vertical agitated tanks sized for…

Piping, manifolds & hoses

The fluid and bulk transfer network of a mud plant: dedicated piping per fluid, manifolds…

How a mud plant chooses pumps: centrifugal pumps for transfer and circulation,…

Power, air & utilities

The utilities behind a mud plant: electrical power and distribution to motors and…

Instrumentation & controls

How a mud plant measures and controls itself: load-cell weigh systems, level, density and…

Commissioning & installation

What it takes to install and commission a liquid mud plant: civil and mechanical…

Barite sag in storage

Why barite settles in mud-plant storage and how to prevent it: the physics of sag in static…

Silo bridging & conveying faults

The common dry-bulk faults in a mud plant: silo bridging and rat-holing, blocked or worn…

Cross-contamination between fluids

How fluids get cross-contaminated in a mud plant — shared lines and pumps, residual heels,…

Dust & emissions problems

Dust and emission faults at a mud plant: blinded or failed bin vents, baghouse problems,…

Transfer & vessel-loading problems

What goes wrong during mud-plant to vessel transfer: slow or blocked bulk and liquid…

LMP audit & advisory

Independent, vendor-neutral liquid mud plant audits and advisory from SC DrillTech: bulk…

Solids Control 3

Reactive vs inert solids

Both read as low-gravity solids — but one you inhibit and the other you remove. Treat them the same and you pay…

Primary vs secondary solids control

The shaker is primary; cyclones, mud cleaner and centrifuge are secondary — dividing the cut by…

Removal efficiency (η)

Drilled-solids removal efficiency — written η (eta) — is the single most useful number in solid…

Mud Cooling 16

Drilling Mud Cooler Systems: Engineering Guide

Engineering guide to drilling mud cooler systems: heat load, exchanger duty, cooling options, HPHT applications, field…

How a Drilling Mud Cooler Works

How drilling mud coolers move heat from hot return mud through an exchanger to seawater or a closed-loop coolant and…

Mud Cooler Sizing & Heat Load Calculation

Calculate drilling mud cooler heat load from flow, density, heat capacity and temperature target, then understand LMTD,…

Mud Cooler Flow Rate vs Temperature Reduction

Understand the relationship between mud flow, heat duty and temperature drop in a drilling mud cooler, with worked…

Mud Cooler Performance Test & Heat Duty

Evaluate drilling mud cooler performance using verified heat duty, temperature approach, flow, pressure drop,…

Mud Cooler Heat Exchanger Configurations

Compare plate-and-frame, wide-gap, semi-welded and shell-and-tube mud coolers by duty, pressure drop, solids tolerance,…

Mud Cooler Cooling Circuits

Compare seawater, cooling-water and glycol circuits for drilling mud coolers, including heat sinks, corrosion, scaling,…

Mud Cooler Selection Guide

Select a drilling mud cooler configuration by heat load, cooling medium, ambient conditions, contamination risk, solids…

Mud Cooler Integration with the Mud System

Engineer mud cooler integration with the active mud system: location, bypass, pumps, tanks, mixing, instruments,…

Mud Cooler Fouling & Plugging Guide

Mud cooler fouling and plugging guide: pressure-drop trends, LCM/debris restriction, strainers, backflushing, CIP,…

Mud Cooler Troubleshooting & Failure Modes

Troubleshoot mud cooler high outlet temperature, fouling, plugging, low coolant flow, bypass leakage, sensor error,…

Mud Cooler HSE and Operational Risks

Mud cooler HSE guide for hot drilling fluid, stored pressure, isolation, cross-leakage, cleaning chemicals, rotating…

Why Drilling Fluid Temperature Matters

Why drilling-fluid temperature matters to rheology, hydraulics, equipment, measurements, personnel exposure, mud cost…

How Mud Temperature Affects Rheology

How drilling-fluid temperature can affect PV, YP, gel strength and flow behavior, why OBM/WBM responses differ and how…

HPHT Drilling Mud Cooling Guide

Why HPHT drilling can require mud cooling, how temperature affects drilling-fluid rheology and surface operations, and…

OBM vs WBM Mud Cooling Considerations

Compare oil-based and water-based mud cooling considerations: heat capacity, density, rheology, emulsion/polymer…

Equipment 13

Mud cleaner vs desilter

The same cones — but the screen underneath decides whether you keep your barite or pay to dump it on weighted…

Shaker screen API → micron chart

The full API RP 13C cut-point chart, why mesh is obsolete, and how to read a screen…

Degasser vs mud-gas separator

Entrained gas vs free gas, conditioning vs well control — and the poor-boy naming…

Mud-gas separator operating principle

Inlet momentum, phase separation, vent backpressure and liquid sealing — how an MGS handles gas–liquid returns…

Mud-gas separator liquid seal

Mud-leg head, vent backpressure and seal-margin loss — the physics that keeps gas out of the shaker house…

Mud-gas separator troubleshooting

Diagnosing gas blow-through, liquid carryover, abnormal pressure and unstable level without bypassing well control…

Hydrocyclone feed head

Hydrocyclones — desanders and desilters — are the only major piece of solids-control equipment …

The pit train in order

You can buy the best shakers, the sharpest cones and the biggest centrifuge on the market and s…

Shaker motion and G-force

Two shakers can carry identical API RP 13C screens and perform completely differently — because…

Desanders and desilters

Desanders and desilters are the same machine at two sizes. Both are banks of hydrocyclones — co…

Of all the equipment in the pit room, the degasser is the one most likely to be misunderstood a…

Tanks, agitation and turnover

Spend on the best shakers, cones and centrifuge on the market and you can still run a poor soli…

The mud cleaner

On a weighted mud, a bank of desilters becomes a liability: barite is ground to pass 200 mesh (…

Method 10

Reading a shaker

Pick a shaker screen by “mesh” alone and you are guessing. Mesh count never described what a sc…

The sand content test

The sand content test is the cheapest, fastest measurement in the entire mud-check kit — a glas…

The daily solids-control report

Most solids-control losses are invisible not because they are hard to see, but because no one i…

Microns, mesh and cut points

Strip solids control down to one sentence and it is this: sorting particles by size, and removi…

Retention on cuttings (ROC)

Retention on cuttings (ROC) is the mass of fluid clinging to discharged solids after the separa…

The solids-control rig audit

A solids-control audit is a systematic inspection of the entire surface separation train — equi…

The methylene blue test

What the MBT tells the solids engineer — how much of your solids load is reactive clay versus inert grind, and what to do…

The retort test

The most honest instrument on the mud bench — oil, water and solids, and how to split solids into LGS versus barite…

The fluid-loss test

API and HPHT filtration, what filtrate and cake really tell you, and why your drilled-solids load decides the cake…

The electrical stability test

How tough your invert emulsion is — the fast ES read, and why water-wet solids quietly drag the number down…

Centrifuge 14

High-Speed vs Low-Speed Centrifuge: Select the Mode by Treatment Objective

Select centrifuge speed for LGS removal, barite recovery or dewatering using RCF, PSD, density contrast, flow and mass balance.

Centrifuge Differential Speed: Cake Dryness, Residence Time and Torque

Understand how decanter bowl-to-scroll differential speed controls solids residence, transport capacity, torque, cake dryness and operating stability.

Centrifuge feed rate & the cut

Feed rate is retention time — your cut-point dial from outside the bowl, balanced against torque…

Dual-centrifuge setups

Slow then fast — middle-speed keeps the barite, high-speed dumps the fines, in series…

Why centrifuges fail

The decanting centrifuge is the most capable machine on the solids-control train and the one mo…

Centrifuge capacity and run hours

A decanting centrifuge that sits idle while dilution climbs is one of the most common and least…

Decanter Centrifuge Operating Variables: Bowl Speed, Differential Speed, Torque and Feed Rate

A systems-level guide to how bowl speed, differential speed, torque, feed rate and pond depth interact in an oilfield decanter centrifuge.

Decanter Centrifuge Torque Explained: What the Number Actually Tells the Operator

Interpret decanter centrifuge conveyor torque, distinguish load from failure, and use torque trends with differential speed, feed solids and cake behavior.

Why Maximum Centrifuge Bowl Speed Does Not Guarantee Better Separation

Why maximum centrifuge RPM can increase stress, wear and conveyor load without delivering the best drilling-fluid separation result.

Centrifuge Solids Loading: Why G-Force Alone Cannot Predict Performance

Calculate centrifuge hydraulic and solids loading, recognize mass-load limits, and understand why equal G-force does not mean equal separation performance.

How to Recognize an Overloaded Decanter Centrifuge

Differentiate hydraulic, solids, conveyor and discharge overload in a decanter centrifuge using field trends and outlet evidence.

Centrifuge Feed Dilution: When It Helps, When It Hurts and How to Test It

Evaluate centrifuge feed dilution by viscosity, solids concentration, hydraulic load, separation result and recovered-liquid economics.

Centrifuge Cut Point vs Liquid Recovery: The Hidden Operating Trade-Off

Understand why finer centrifuge separation can increase liquid or barite loss, and evaluate cut point together with recovery and mass balance.

Why a Dry Centrifuge Cake Does Not Always Mean Better Performance

Evaluate centrifuge cake dryness alongside centrate quality, mass balance, solids recovery, liquid loss and treatment objective.

Drilling Fluids 45

Drilling Fluid Mixing and Conditioning Systems

System-level guide to hoppers, eductors, pumps, shear, bulk additives, tanks and operational mixing control.

Gel strength & thixotropy

How your mud holds barite when the pumps stop — the 10-second and 10-minute gels, and what the gap between them…

Bingham vs power law vs Herschel-Bulkley

Three rheology models from the same viscometer — and why the simplest one over-predicts exactly where it…

Same invert family, different base fluid — and the base decides toxicity, discharge and total…

Low-gravity solids, the retort, and the dilution they force

Every problem solids control exists to solve comes down to one quantity: low-gravity solids (LG…

Marsh funnel viscosity

The Marsh funnel is the most-used and most-misunderstood instrument on the rig. It is quick, ru…

Mud weight, barite and sag

Solids control spends most of its attention on the solids it wants out — but it has an equally …

Plastic viscosity, yield point and what they tell the solids engineer

To diagnose what solids are doing to the mud, you need two numbers from a rotational viscometer…

Non-aqueous drilling fluids

Non-aqueous drilling fluids (NADF) — OBM and SBM — change the solids-control job in fundamental…

Air, Mist, Foam and Aerated Drilling Fluids

Guide to gasified and low-density drilling fluids: air, mist, foam and aerated mud, including applications, limits, corrosion and…

Bentonite Hydration and Yield: Water Chemistry, Shear and Performance

Bentonite hydration guide covering yield, water chemistry, hardness, salinity, shear, prehydration and field performance.

Bridging Particle-Size Design: Abrams Rule, D50/D90 and Ideal Packing

Particle-size design guide for bridging/sealing fluids using Abrams rule, D50/D90 concepts, packing logic and field limitations.

Carbonate and Bicarbonate Contamination in Drilling Fluids

Technical guide to carbonate/bicarbonate contamination, alkalinity interpretation, rheology symptoms, CO2 links and treatment…

Cement Contamination in Water-Based Drilling Fluids

Guide to cement contamination in WBM: pH, calcium, rheology spikes, flocculation, testing sequence, treatment logic and field…

Bacterial Degradation and Biocide Control in Water-Based Mud

Guide to bacterial degradation in WBM, polymer breakdown, odor, pH shifts, biocide control, mud maintenance and field diagnosis.

Drilling Fluid Corrosion Control: Oxygen, CO2, H2S and Salts

Corrosion-control guide for drilling fluids covering oxygen, CO2, H2S, salts, pH, scavengers, inhibitors and monitoring.

Drilling Fluid Foaming and Defoamer Selection

Foaming guide for drilling fluids: causes, surfactants, gas entrainment, solids, defoamer selection, mixing practice and field…

Drilling Fluid Lubricity: EP Test, Coefficient of Friction and Field Interpretation

Field guide to drilling-fluid lubricity testing, EP-lubricity results, coefficient of friction, torque-risk interpretation and…

Drilling Fluid Water Activity: Osmosis, Shale Hydration and Inhibition

Explains drilling-fluid water activity, osmotic shale inhibition, salt/polymer effects and why water activity must be interpreted…

Dynamic HPHT Filtration: Spurt Loss, Cake Deposition and Crossflow

Dynamic HPHT filtration guide covering spurt loss, moving-cake behavior, crossflow, differential pressure and field interpretation…

Gas-Hydrate Inhibition in Deepwater Drilling Fluids

Deepwater drilling-fluid guide to hydrate risk, thermodynamic and kinetic inhibition, salinity, glycols, temperature and…

Glycol Drilling Fluids: Cloud Point, Shale Inhibition and Field Use

Glycol drilling-fluid guide covering cloud point behavior, shale inhibition mechanisms, WBM performance, limitations and field…

Gypsum, Anhydrite and Calcium Contamination in Drilling Fluids

Guide to calcium contamination from gypsum/anhydrite, hardness increase, clay flocculation, rheology impact and field response.

H2S in Drilling Fluids: Chemistry, Detection and Safe Control

H2S drilling-fluid guide covering sulfide chemistry, pH control, scavengers, detection, safety limits and operational response.

HPHT Mud Density: Thermal Expansion, Compressibility and ECD

Explains HPHT mud density behavior, thermal expansion, compressibility, pressure/temperature effects and ECD interpretation.

Invert-Emulsion Emulsifiers vs Wetting Agents

Explains the difference between emulsifiers and wetting agents in invert-emulsion mud, how they protect stability, and how field…

Internal Brine Phase and Water Activity in Invert Mud

Guide to internal brine salinity, water activity, osmotic shale control, emulsion stability and field checks in invert-emulsion mud.

KCl/PHPA Drilling Fluid: Shale Inhibition, Encapsulation and Field Control

KCl/PHPA drilling-fluid guide covering potassium inhibition, PHPA encapsulation, shale control, testing, limitations and…

Lime Reserve in Invert-Emulsion Mud: What It Controls

Explains lime reserve in invert-emulsion mud, why alkalinity matters, how it supports emulsifier chemistry and how to avoid…

Low-Solids Nondispersed Polymer Mud: Design, Benefits and Limits

Low-solids nondispersed mud guide covering polymer design, solids control, dilution discipline, rheology, applications and field…

Micronized Barite: High-Density Drilling Fluid, Sag and Rheology

Guide to micronized barite in high-density drilling fluids: PSD, sag control, rheology, ECD, separation and field limitations.

Mud Balance Calibration: Density Errors, Checks and Field Practice

Mud balance calibration guide covering density measurement errors, freshwater checks, trapped air, dirty cups and field QA practice.

Organophilic Clay in Invert-Emulsion Drilling Fluids

Technical guide to organophilic clay in invert mud: suspension, low-shear structure, activation, overtreatment and solids-control…

PAC vs CMC vs Starch: Fluid-Loss Control in Water-Based Mud

Compares PAC, CMC and starch for WBM fluid-loss control, salinity/temperature tolerance, viscosity contribution and field selection.

Polyamine Drilling Fluids: Shale Inhibition and High-Performance WBM

Polyamine drilling-fluid guide covering shale inhibition, high-performance WBM design, compatibility, field monitoring and limits.

Pressure-Transmission Testing for Shale-Fluid Interaction

Pressure-transmission testing guide for shale-fluid interaction, membrane efficiency, pore-pressure response and wellbore stability…

Reservoir Drill-In Fluids: Bridging, Formation Damage and Cleanup

Reservoir drill-in fluid guide covering bridging design, formation damage mechanisms, cleanup, compatibility and solids-control…

Retort Calibration and Volume-Error Control

Retort QA guide covering calibration, sample size, condenser condition, reading errors, solids/oil/water interpretation and LGS/HGS…

Salt Contamination in Water-Based Drilling Fluids

Salt contamination guide covering chloride increase, rheology effects, shale inhibition context, polymer response and treatment…

Shale Inhibition Tests: Hot Roll, Linear Swell, CST and Accretion

Compares shale inhibition test methods including hot-roll recovery, linear swell, CST and accretion, with interpretation limits.

Silicate Drilling Fluids: Shale Sealing, Inhibition and Limitations

Silicate drilling-fluid guide covering shale sealing, high-pH chemistry, compatibility, operational limits and field…

Spud Mud and Bentonite Systems: Hydration, Yield and Surface-Hole Use

Guide to spud mud and bentonite systems for surface-hole drilling, viscosity, hole cleaning, losses, solids loading and transition…

Drilling Fluid Thermal Aging: Hot Rolling, Property Drift and Interpretation

Thermal aging guide for drilling fluids covering hot rolling, HPHT property drift, polymer degradation, emulsion stability and…

Rotational Viscometer Calibration and Field Verification

Rotational viscometer QA guide covering calibration, bob/sleeve condition, spring checks, temperature, speed and field verification.

Xanthan Gum in Drilling Fluids: Low-Shear Rheology and Hole Cleaning

Guide to xanthan gum in drilling fluids, low-shear rheology, suspension, hole cleaning, thermal limits and contamination effects.

Completion Filtration 4

Brine clarity & NTU

What “clean” completion brine actually means — turbidity targets, API RP 13J, and why particle size matters as much as NTU…

The filter press (DE)

Diatomaceous-earth filtration for bulk solids — precoat, body feed, and where the press sits in the brine train…

Cartridge & bag filtration units

The final polish to NTU spec — micron ratings, nominal vs absolute, Beta-rating and coarse-to-fine staging…

Brine filtration troubleshooting

Hitting NTU without killing throughput — blinding, breakthrough, DE release and the staging that fixes them…

Regional / MENA 4

Drilling waste disposal: GCC & MENA

Where Gulf drilling waste goes — CRI, thermal, landfarming, evaporation, and the move to zero discharge…

Onshore desert operations

Evaporation pits, landfarming, CRI and thermal — running desert waste so the climate works for you…

Cuttings disposal routes

Injection, thermal and land — the real routes for drill cuttings and how to choose between them…

Oil on cuttings & discharge limits

The OSPAR 1% limit, EPA no-free-oil rule and GCC zero-discharge — the number that decides where waste goes…

Pump Engineering
Selection, feed, transfer, DWM, calculators, troubleshooting and enclosed cuttings-transfer references.

Vacuum & Cuttings Transfer 8

Vacuum Transfer Components and Process Cycle for Drill Cuttings

Component-level guide to enclosed drill cuttings vacuum transfer systems for cuttings, sludge, pit material and tank-cleaning duties.

How Vacuum Cuttings Transfer Works

Process explanation for vacuum cuttings transfer: suction cycle, receiver filling, pressure discharge, air demand and operating limits.

Vacuum Transfer Lines and Hose Routing

Engineering guide to vacuum-transfer line sizing, hose routing, bend control, vertical lift and blockage prevention.

Wet vs Dry Cuttings Vacuum Transfer

Technical comparison of wet, dry and semi-dry cuttings transfer behaviour in enclosed vacuum and pneumatic movement systems.

Tank Cleaning Solids Transfer System

Engineering guide to tank-cleaning solids transfer for sludge, settled solids, pit material and drilling-fluid residues.

Loss of Suction in Vacuum Transfer Systems

Troubleshooting loss of suction in drill cuttings and sludge vacuum-transfer systems: leaks, restrictions, receiver cycle and air supply.

Blocked Vacuum Transfer Line

Troubleshooting guide for blocked vacuum transfer lines in drilling waste and tank-cleaning service.

Vacuum Transfer vs Screw Conveyor for Drill Cuttings

Engineering comparison of enclosed vacuum transfer and screw conveyors for drill cuttings handling, logistics and layout decisions.

Pump Selection & Comparisons 5

Rig Solids-Control and DWM Pump Duty Selection

Vendor-neutral pump selection guide for drilling fluids, solids control and waste transfer duties: flow, head, solids, viscosity, NPSH, control and acceptance checks.

Centrifugal vs Progressive Cavity Pumps in Drilling Systems

Engineering comparison of centrifugal and progressive-cavity pumps for drilling-fluid, feed, sludge and waste-transfer duties.

AODD vs Progressive Cavity Pumps for Sludge and Waste Transfer

Engineering comparison of AODD and progressive-cavity pumps for sludge, pit material, tank-cleaning and drilling-waste transfer.

Slurry Pump vs Transfer Pump in Drilling Waste Service

How to separate slurry-pump duties from general transfer-pump duties in mud systems, waste pits and abrasive solids movement.

Pump Materials and Wear in Drilling Fluids Service

Pump material, wear and elastomer selection guide for drilling fluids, weighted mud, cuttings slurry, chemicals and waste service.

Pump Troubleshooting 5

Pump Priming in Drilling Fluid Systems

Troubleshooting guide to pump priming in drilling-fluid systems: flooded suction, air locks, foot valves, hose routing and restart checks.

Air Entrainment in Pump Suction

Troubleshooting guide to air entrainment in pump suction: vortexing, leaking joints, low tank level, foaming mud and unstable discharge.

Mechanical Seal Failure in Mud System Pumps

Troubleshooting guide to mechanical seal failure in mud-system pumps: dry running, misalignment, solids, flush plans and pressure limits.

Pump Troubleshooting: Low Flow and Low Pressure

Troubleshooting guide to low pump flow and low pressure in drilling-fluid systems: suction, speed, wear, air entry, wrong curve point and restriction checks.

Pump Vibration Troubleshooting in Drilling Fluid Systems

Troubleshooting guide to pump vibration in drilling-fluid systems: cavitation, misalignment, imbalance, piping strain, air entry and operating point.

Specialized Pumps 5

Submersible and Sump Pumps on Rig Sites

Engineering guide to submersible and sump pumps for rig drains, cellars, pits, washdown recovery and dirty-water handling.

Metering Pumps for Drilling Fluid Chemicals

Engineering guide to metering pumps for drilling-fluid chemicals: dose accuracy, calibration, turndown, injection point and field verification.

Peristaltic Pumps for Polymer Dosing

Engineering guide to peristaltic pumps for polymer dosing: tube life, low-shear delivery, calibration, pulsation and pressure limits.

Diaphragm Pumps for Drilling Waste Transfer

Engineering guide to diaphragm pumps for drilling waste, dirty transfer, pressure limits, pulsation, check valves and solids handling.

Gear and Lobe Pumps in Drilling Fluid Service

Vendor-neutral guide to limited gear and lobe pump applications in drilling-fluid service, with viscosity, shear, pressure and solids limits.

Pump Calculators 5

Pump TDH Calculator for Drilling Fluid Systems

Field guide to pump TDH calculation for drilling-fluid transfer, hydrocyclone feed, mixing loops and DWM routing.

NPSH Available Calculator for Mud Pumps

Field guide to NPSH available calculation for drilling-fluid pumps, suction losses, vapor pressure, cavitation and margin.

Pipe Pressure Loss for Drilling Fluids

Engineering guide to pipe pressure loss for drilling-fluid pumps: velocity, SG, viscosity, fittings, hose routing and field checks.

Tank Transfer Time Calculator for Mud Systems

Field guide to tank transfer time calculation for mud systems, mud plants, storage movement, dilution volume and pump performance checks.

Hydrocyclone Feed Pressure and Head Calculator

Engineering guide to hydrocyclone feed pressure/head calculation for desanders, desilters and mud cleaners.

Pump Systems 24

Pumps in Drilling Fluids, Solids Control and DWM

Pump duty hub for feed, transfer, mixing, dewatering, sludge and drilling-waste pump duties.

Desander Feed Pump

Pressure-to-head conversion, cone count, pump duty and field acceptance checks.

Desilter Feed Pump

Fine-cone feed stability, active cone count, manifold behavior and weighted-mud caution.

Centrifuge Feed Pump

Feed stability, residence-time effect, torque response, dosing impact and centrate quality.

Cuttings Disposal Pumps

Pumpable vs conveyable waste, dilution penalty and transfer-method selection.

Air-Operated Solids Transfer Units

Suction/discharge cycle, practical transfer rate, air demand and tank-cleaning limits.

Centrifugal Pumps in Drilling Fluid Systems

Curves, head, density correction, cavitation, impeller trim and acceptance checks.

Pump Curve for Drilling Fluid Pumps

Flow, head, efficiency, horsepower, NPSH, impeller diameter and system resistance.

Pump Hydraulic Power and Motor HP

Hydraulic horsepower, motor load, SG correction, efficiency and safety margin.

Impeller Diameter and Pump Performance

Impeller trim, affinity checks, motor load and field approval governance.

Specific Gravity and Viscosity Correction for Mud Pumps

How density and viscosity change pressure, power, line loss and suction risk.

VFD Pump Control in Drilling Fluid Systems

Affinity laws, speed bands, motor load, cavitation and process acceptance.

Pumps in Series and Parallel in Mud Systems

Head addition, flow addition, header limits, curve interaction and field control.

Pump Suction and Discharge Design for Mud Systems

Flooded suction, line velocity, fittings, valves, NPSH and erosion control.

Progressive-Cavity Pumps for Drilling Waste

Controlled viscous transfer, sludge feed, dry-run protection and pressure limits.

Screw Pumps for Drilling Waste Transfer

Viscous oily waste transfer, pressure protection, wear limits and acceptance checks.

AODD Pumps for Sludge and Waste Transfer

Portable sludge, sump and waste transfer with air demand and pulsation control.

Slurry Pumps for Drilling Waste

Abrasive drilling-waste transfer, line velocity, settling and erosion window.

Tank Cleaning and Sludge Transfer Pumps

Settled sludge pickup, debris handling, suction recovery and disposal-volume control.

Mud System Transfer Pumps

Tank-to-tank movement, line losses, valve-up, flow measurement and transfer limits.

Mixing Hopper Pump Selection

Venturi pull, nozzle energy, powder induction and mixing-loop stability.

Mud Plant Transfer Pumps

Storage movement, loading, receiving, segregation, long lines and SG correction.

Dewatering Feed Pumps

Stable feed, chemistry contact, centrifuge load, variable sludge and flow control.

Chemical Dosing Pumps for Dewatering

Dose calculation, active concentration, solution strength, calibration and turndown.

DWM 34

Thermomechanical Cuttings Cleaner (TCC)

Vendor-neutral guide to friction-based thermal desorption, process mill behavior, vapour handling and selection limits.

Drill Cuttings Vacuum Transfer Systems

Cuttings and sludge vacuum transfer as an enclosed drilling-waste handling system, distinct from vacuum degassing.

Coagulation vs Flocculation in Drilling-Waste Dewatering

Coagulation vs flocculation in drilling-waste dewatering: mechanisms, mixing, sequence, polymer selection and field verification.

Cuttings dryer vs centrifuge

Two machines, one recovery train — the dryer recovers the fluid, the centrifuge cleans…

Five drilling-waste-management mistakes that quietly cost you money

Drilling waste management is where solids control meets the environment — and the budget. The h…

Cuttings dryers

On an oil- or synthetic-based-mud well, the cuttings dryer is usually the single biggest lever …

Dewatering Chemistry: Coagulants, Flocculants and Jar-Test Logic

Drilling-waste dewatering chemistry: coagulation, flocculation, pH, salinity, jar testing, mixing, overdose risk and scale-up…

Closed-loop and zero-discharge

A closed-loop system removes the one thing solids control has always quietly leaned on: the res…

Thermal Desorption Units (TDU) for Drilling Waste

Engineering guide to thermal desorption for drilling waste: feed conditioning, thermal separation, vapour recovery, residual-oil targets, TCC relationship and selection limits.

CRI Closure and Post-Injection Monitoring

CRI closure framework covering inventory reconciliation, pressure decline, barrier verification, post-injection surveillance,…

CRI Formation Selection, Fracture Containment and Injection Capacity

CRI formation selection, barriers, fracture containment, cumulative capacity, offset-well risk and the limits of surface-only…

CRI Grinding and Screening: PSD Control and Plugging Prevention

CRI grinding, de-trashing and screening for controlled PSD, reliable throughput and lower plugging risk without copying…

CRI Injection Pressure: Reading the Pressure Trend Correctly

Interpret CRI injection pressure with rate, slurry properties, friction, well condition and formation response—not one surface…

CRI Injection-Well Integrity: Barriers and Surveillance

CRI well-integrity guide covering barriers, cement, annulus surveillance, erosion, corrosion, pressure testing, leak diagnosis and…

CRI Injectivity and Step-Rate Testing: Purpose, Interpretation and Limits

Understand CRI injectivity and step-rate tests, preserve comparable data, and keep interpretation within the approved subsurface…

CRI Monitoring and Injection Assurance: Volumes, Pressure, Rate and Trends

Build CRI monitoring around volume reconciliation, pressure-rate trends, slurry QA/QC, batch traceability, downtime and data…

CRI Shutdown, Stop Conditions and Restart Assessment

CRI stop conditions, controlled shutdown, flushing, settling risk, restart checks and escalation without unsafe universal limits.

CRI Slurry Design: PSD, Solids Concentration, Rheology and Suspension

CRI slurry engineering for PSD, solids concentration, density, rheology, suspension, sampling and QA/QC without unsafe universal…

CRI Surface System: Collection, Grinding, Mixing and Injection

Engineer the CRI surface system from cuttings collection and de-trashing through grinding, slurry mixing, buffer capacity and…

CRI Troubleshooting: Rising Pressure, Plugging and Loss of Injectivity

Cause-and-evidence CRI troubleshooting for rising pressure, plugging, falling injectivity, slurry inconsistency and surface…

CRI vs Offsite Disposal: Engineering Decision Guide

Compare CRI with offsite disposal using waste compatibility, containment, logistics, capacity, HSE, contingency and lifecycle cost.

Dewatering Centrifuge Operating Variables

Control bowl speed, differential speed, pond depth, feed, torque, chemistry and mass loading in a drilling-waste dewatering…

Dewatering Centrifuge vs Filter Press

Compare decanter centrifuges and sludge filter presses by feed, duty cycle, chemistry, outlet quality, operability and lifecycle…

Dewatering Chemical Dose Calculation and Solution Make-Down

Dewatering chemical-dose calculation: convert jar-test doses to active mass rate, product rate and calibrated solution-pump…

Coagulant Selection for Drilling-Waste Dewatering

Select dewatering coagulants by feed chemistry, pH, alkalinity, salinity, mineralogy, polymer compatibility and jar-test evidence.

Dewatering Feed Variability: Oil, Salinity, Solids and pH Effects

How pH, salinity, solids, PSD, clay mineralogy, oil/emulsion contamination and drilling-fluid additives change dewatering response.

Flocculant Selection: Charge, Molecular Weight and Shear Sensitivity

Select dewatering flocculants by charge, molecular weight, salinity response, make-down quality, shear sensitivity and field…

Dewatering Jar Test: Dose Selection, Mixing and Scale-Up

Jar-test method for drilling-waste dewatering: representative sampling, stock basis, dose matrix, mixing, floc evaluation and…

Polymer Make-Down and Aging for Dewatering

Control polymer wetting, concentration, hydration, aging, shear, water quality, dosing basis and verification in drilling-waste…

Dewatering Unit Mass Balance: Feed, Recovered Water and Solids

Dewatering mass balance for feed, recovered liquid and concentrated solids, including dry-solids capture, closure and a worked…

Dewatering Unit Process Flow: Feed, Conditioning, Separation and Water Return

Dewatering process flow: feed equalization, pH adjustment, chemical make-down, injection, centrifuge separation and output routing.

Dewatering Unit Troubleshooting: Chemistry, Mixing, Centrifuge and Water Quality

Dewatering troubleshooting for cloudy water, weak floc, high chemical use, wet solids, low throughput and changing feed conditions.

Dewatering Water Quality: Turbidity, TSS, Oil and Reuse Boundaries

Assess recovered dewatering water using turbidity, TSS, oil and grease, pH, conductivity and destination-specific acceptance…

Drilling-Waste Dewatering Unit: Complete Process Guide

Engineering guide to drilling-waste dewatering: conditioning, coagulation, flocculation, centrifuge separation, water quality and…

Solids Control Performance 4

Solids control performance KPIs

The six numbers that decide it — SRE, LGS, dilution ratio, ROC, screen life and cost per foot…

Solids loading & ROP

The feedback loop — drilled solids you don’t remove slow the bit, and the slow bit makes more solids…

The cut-point cascade

Shaker to centrifuge — each stage catches a finer band, and a dropped band is where LGS climbs…

Screen conductance & utilization

Cut point vs conductance, NBA and utilization — the API RP 13C numbers that set the shaker’s ceiling…

Performance 5

D50 vs D100 cut point

A cut point is one number on a curve — D50 is the median, D100 is total separation, and which one changes the…

Efficiency that keeps the bit turning

Solids control is often filed under “cost centre” — equipment you run because you have to. That…

Differential sticking

Differential sticking is the most expensive single failure mode in drilling — and one of the mo…

Solids control on HPHT wells

HPHT drilling — BHT above 150 °C and/or pore pressures exceeding 10,000 psi — is where the soli…

Equivalent circulating density (ECD) is the effective mud weight the formation sees while the p…

Economics 1

Cutting dilution cost

Most solids-control losses are invisible because the system never stops running. Nothing trips,…

Compliance 1

Drilling-waste environmental compliance

Environmental compliance used to be paperwork the HSE department handled after the well was dri…

History 1

The history of solids control

Most people assume solids control started on a drilling rig. It didn’t. The equipment standing …