I ran a 6-hour DST on a nice Class III amplitude, modeled 18% phi and 120 mD, and the well delivered 0.2 bbl/hr with a pressure derivative so flat I could use it as a core plug face… I need a support group for geologists who keep believing crossplots like they’re Tinder profiles — who else has a textbook reservoir characterization that turned into a rom-com plot twist at 2 a.m?
But got burned on a Class III too — 6-hr DST gave 0.2 bbl/hr thanks to OBM invasion and fat skin. > like they’re Tinder profiles — who else has a textbook reservoir characterization that turned into a rom-com plot We re-perf’d hotter, pumped a tiny acid spearhead, and stretched cleanup to about 10 hrs; derivative finally moved and rates went 2–3 bbl/hr — if you can’t acid, try underbalanced perf or at least a longer shut-.
Had a Class III looker with about 18% phi and “120 mD ” that turned into a 2 a.m. trickle; the next time, a 10–15 min micro‑injection before the 6‑hour clock told us the face was choked before we wasted the flow period. If you can, throw a tiny underbalance cleanup shot first; if the derivative still lays flat, it’s not the rock romance you think, it’s near‑wellbore drama.
We started doing a quick 3–5 minute underbalance surge before starting the test and it rescued a couple of AVO swipe‑right sands, @OP. If OBM cleanup’s the suspect and you can’t swap, a tiny diesel + mutual solvent preflush with a short soak can knock down skin; otherwise, depth‑shift half a stand and try again.
Quick tip we learned the hard way: before you start the six‑hour timer, TCP with deep‑penetration charges and run two 2–3 minute flow/kill cycles; if the derivative stops looking “core‑plug flat” after the second pass, you had near‑wellbore crud, not a dead sand… If it stays flat, it’s probably laminated or a tiny compartment — — and no cleanup trick will save it, @jordan_wilms82.