DWM · OIL-BASED RECOVERY

Vertical cuttings dryer

The single biggest recovery on an oil-based well

On an oil- or synthetic-based-mud well, the vertical cuttings dryer is usually the single biggest lever on both fluid cost and waste volume. Every percent of fluid left clinging to the cuttings is base oil you bought and will now pay to dispose of, plus waste mass you'll pay to haul. Getting oil-on-cuttings down is where the recovery lives — and where compliance is won or lost on a non-aqueous well.

What it does

Spin the clinging base fluid off the drilled cuttings to recover it to the active system and drive oil-on-cuttings (OOC) down toward the discharge limit, before the cuttings are discarded, re-injected or hauled.

How it works

A high-speed vertical centrifuge with a conical screen basket: cuttings are fed in and centrifugal force throws the clinging fluid through the screen while the dried solids are conveyed out. The recovered fluid still carries fine solids, so it is polished by a decanting centrifuge before rejoining the active system — dryer and centrifuge work as a pair.

Key components

Conical screen basketThe working surface; throws fluid off the solids. Wear or holes send fluid through with the solids.

Rotor & tips / scraperScrape and re-expose the cake so the inner face dries; worn tips leave a wet face.

Feed system (PCP)A progressive-cavity feed pump for a steady, controllable rate — as important as the dryer itself.

Effluent (recovered-fluid) lineCarries recovered fluid out; a backed-up line floods the bowl and re-wets the cake.

VFD / driveSets bowl speed / G; belt slip or a VFD fault drops the dewatering G.

Operating parameters

Parameter	Range	Notes
OOC target (OBM/SBM)	~3–5%	Below what a shaker alone reaches
NAF discharge limit	6.9% (40 CFR 435)	Retention-on-cuttings cap on a non-aqueous well
Feed rate	steady, rated	Surging / over-feeding is the usual cause of wet discard
Partner stage	decanter centrifuge	Polishes the recovered fluid before reuse

Health indicators — what good looks like

Discard leaving as dry, free-flowing granules.
Retort OOC under target and the discharge limit.
Recovered fluid returning clean to the centrifuge / system.
Steady feed — no surging, thin even bed in the basket.

Common problems & how to fix them

The failures this machine throws, each with a full field fix:

Wet / oily discard (high OOC)

Base oil leaving on the cuttings — recovery loss + compliance.

Troubleshoot →

Field tips

Measure OOC with a retort, not the eye — ‘looks dry' has signed off a lot of barrels that weren't.
Feed it at a steady, rated rate; surging and over-feeding are the usual cause of a wet, oily discard.
The dryer never works alone — the recovered fluid is polished by a decanter centrifuge before reuse.
On a NAF well, the discard retort is your compliance number, not just a performance check.

Want this machine read on your rig?

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