SC DRILLTECH · COMPLETE GUIDE
Drilling fluid does the work of the well — it carries cuttings, balances pressure, cools the bit and stabilises the hole. Almost every property that matters is made or wrecked by solids: how many, how fine, how well controlled. This guide connects the fluid you test in the mud lab to the equipment that keeps it in spec, and links out to the fundamentals and to each property in depth.
Water-base mud (WBM) — cheapest and most common; tolerant of full hydrocyclone use on unweighted systems. Non-aqueous fluids (NAF) — oil- and synthetic-base mud for shale stability, high temperature and lubricity; expensive, regulated, and unforgiving of poor solids control because every barrel lost to dilution or ROC is costly. Where solids control matters most on NAF →
Density (mud weight) — set with barite; drilled solids creep it up uncontrollably if not removed, and barite that settles causes sag. Mud weight, barite and sag →
Rheology (PV / YP) — plastic viscosity tracks solids loading almost directly; a rising PV is usually a solids-control problem before it’s a chemistry problem. PV, YP and what they tell solids control →
Low-gravity solids (LGS) — the drilled fines you’re trying to keep out; the retort and a simple mass balance reveal how much dilution they’re forcing. LGS, the retort and dilution →
Funnel viscosity — the quick field check; what 46 seconds actually means. Marsh funnel viscosity →
Every property above is really a statement about particle size. The shaker, the cones and the centrifuge each own a band of the PSD curve; what one stage misses, the next must catch — or the fluid carries it and dilution pays. Reading the curve, not just the retort, is how you find where the solids are escaping. The Drilling Fluids Fundamentals page covers the testing and rheology in depth.
A mud check is a to-do list for the solids-control train. PV up? Read the centrifuge and cones. Weight creeping with no barite added? Drilled solids aren’t coming out — check the shakers. Sag appearing? Look at low-side dynamic settling and centrifuge balance. Every fluid symptom points back to a machine, and the Troubleshooting Center takes it from there. It all starts with solids control done right.
This map gathers the SC DrillTech drilling-fluids knowledge base in one place: core mud properties, testing, inhibition, invert systems, contamination, HPHT temperature, mud plant handling and the troubleshooting pages that affect mud performance.
The cluster intentionally links to pages that live in other sections when they directly affect drilling-fluid performance. The URL stays where it already belongs; this hub simply makes the technical path easier to follow.
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