ACT · Act now — correcting soonShale shaker →Cost of fault ≈ $120k+ / incident
Why it matters
A blinded or flooded shaker dumps whole mud and unscreened solids into the active system — or over the end of the deck. Every minute of flooding is fine solids bypassing your first and most important removal stage.
Likely causes
Near-size particle blinding — particles the same size as the openings lodge and plug them.
Screen too fine for the loading / ROP — the deck can’t pass the volume.
Worn or holed panels being masked by finer screens elsewhere.
High viscosity / gel — fluid won’t pass the screen fast enough.
Deck angle / pool mismanaged.
Uneven feed distribution — one end overloaded.
How to diagnose it
Read the pool (beach): fluid off the discharge end = overload/flooding; a bone-dry deck = you could go finer.
Inspect panels for near-size blinding (a packed film) vs actual holes.
Check the screen API number against the section (top-hole/high-ROP vs fine).
Check mud rheology — high PV/YP slows throughput.
Confirm deck angle and feed spread across the deck.
The fix — step by step
Step to the correct API screen for the load — coarser to clear flooding; finer only when the deck runs dry.
Replace blinded/holed panels — never patch around with mismatched mesh.
Manage the pool: set the deck angle so the beach sits correctly.
Address rheology upstream if viscosity is throttling throughput.
Balance the feed across the deck.
Confirm it's fixed
✓ Verify: A managed pool — fluid breaking just before the discharge, a defined beach of dry-ish cuttings rolling off the end — with no flooding and no bypass. Solids leaving dry, fluid going through, not over.
Field note. The shaker is the cheapest barrel of removal on the rig — everything downstream is just cleaning up what it missed. Chasing a finer screen while the deck floods is the classic mistake; the fix is usually a coarser screen and a managed pool, not a finer one.