Solids control is not won by big decisions; it is won by the same short round of checks every tour. A stage drops out quietly — a torn screen, a roped cone, an idle centrifuge — and by the time the retort confirms it, you are already buying dilution. This checklist is the round that catches it first.
Walk the train in order
Start at the shakers, because they carry the biggest load. Look for pooling fluid (blinding), torn or holed panels, and cuttings that look wetter than they should — each is a screen problem passing solids downstream. Confirm the screens are the size the section calls for, seated and tensioned, with no mud channelling around a bent frame. Then the hydrocyclones: the desilter and desander underflow should be a light, fanned spray, not a thick rope; a rope means a starved or plugged cone dumping mud instead of cutting.
Then the centrifuge — the stage most often left idle. Is it running, at the right bowl speed, taking the fines the cyclones pass? A centrifuge that is off is LGS building in slow motion. Finally the pumps and lines that feed the cyclones: the cones only cut if they get their feed head, so a worn feed pump or a pinched line quietly starves the whole silt stage.
Read the numbers, not just the machines
The mud report is the other half of the round. Watch plastic viscosity and gel strengths for the early signature of rising low-gravity solids — PV creeping up, gels thickening the longer the mud sits. Check the retort solids and, from the mud weight, the low-gravity fraction: is drilled-solids content trending toward the 5% line, or past it? Note the sand content; a rise with no other cause means a screen is passing what it should catch.
Track one economic number too: the dilution rate or dilution ratio — how much fluid you are replacing against the footage drilled. It is the honest scorecard for whether the whole train is keeping up. A dilution rate that climbs while the machines ‘look fine’ is the cue to look harder, because a stage is bypassing somewhere the eye missed.
Close the loop on the discard
The last check is the cheapest and most overlooked: look at what you are throwing away. Shaker cuttings that are soaking wet mean fluid is leaving with the solids — screen or deck-angle problem, and money over the end. Cyclone underflow that is watery means the cones are barely loaded; a centrifuge cake that is sloppy means it is not making its cut. The discard tells you, tour over tour, whether the train is removing solids or removing mud.
None of these checks takes long, and that is the point. The whole value of a daily round is that it is short enough to actually do every tour, and complete enough to catch a stage dropping out while the fix is still a maintenance ticket — not a dilution program written after the retort finally caught up.
The daily round (checklist)
Shakers — no pooling/blinding · screens intact & correct size · frame sealed · cuttings not over-wet
Cyclones — desander & desilter underflow = spray, not rope · fed at head
Centrifuge — running · right bowl speed · taking the fines · cake not sloppy
Feed pumps/lines — head maintained · no worn pump or pinched line
Mud report — PV & gels trend · retort/LGS vs ~5% · sand content
Discard — cuttings not soaked · underflow loaded · dilution rate vs footage
The value of the round is that it’s short enough to do every tour and complete enough to catch a stage dropping out early. Read the machines and the numbers — PV, LGS, sand, dilution rate — and always look at the discard. A stage caught on the round is a maintenance ticket; the same stage caught by the retort is a dilution bill.
Common questions
What should a daily solids-control check include?
Walk the train in order — shakers (blinding, tears, screen size), cyclones (spray not rope), centrifuge (running, right speed), feed pumps (head maintained) — then read the mud report (PV, gels, retort/LGS, sand) and the dilution rate, and finally inspect the discard for over-wet cuttings or watery underflow.
Why check the discard in solids control?
Because it shows whether you are removing solids or removing mud. Soaking-wet shaker cuttings mean fluid is leaving with the solids; watery cyclone underflow means the cones are barely loaded; a sloppy centrifuge cake means it isn't making its cut. The discard catches problems the gauges miss.
How does a daily checklist save money?
It catches a stage dropping out — a torn screen, a roped cone, an idle centrifuge — while the fix is still a cheap maintenance action, before rising low-gravity solids force an expensive dilution program that costs 3–4 times the fluid volume to correct.
