Reservoir Surviellance Planning

A: Picking too short a shut‑in leaves you with near‑wellbore storage effects and a wasted PTA window. Using the diffusivity relation r ≈ √(4αt), where α scales with k/(φμct), plugging the numbers lands you in tens of hours, not single digits. Days are excessive, but hours are optimistic. The 48–72 hr window clears the 800 ft target without crippling production.

A: Ignoring the dominant mechanism risks sudden gauge failure and loss of the surveillance string. At elevated temperature with H₂S, sulfide stress cracking governs material selection and is exactly what ISO 15156 addresses. CO₂ and oxygen effects are secondary here, and galvanic issues don't explain abrupt downhole failures seen in sour service.

A: Skipping the sequence leads to commissioning a gauge that looks alive but is numerically wrong, poisoning every future PTA. Scaling and units must be right before stimulus; otherwise, a good response masks a bad transfer function. Time alignment matters, but only after magnitude is trusted.

A: Overreacting here can shut in a healthy well and derail allocation. ±5–10% uncertainty on multiphase meters means a few percent swing is noise unless pressure or logs agree. The confident‑sounding reservoir mechanisms don't align with flat pressure and zero interference response.

A: Expecting early hits leads to declaring failure and stopping sampling too soon. Even with a nominal 5 ft/day, tortuosity and dispersion stretch arrival into months. Weeks are optimistic and days ignore physics. Years overshoot unless connectivity is extremely poor.

A: Ignoring cycling effects sets you up for gradual data corruption that no amount of analysis fixes. Drift correlates with repeated expansion and contraction of the sensing element, so cycle‑qualified hardware matters. Sampling and recalibration can't undo physical damage.

A: Accepting poor repeatability wastes seismic budget and leads to false flood‑fronts. NRMS under ~10% is the gate that keeps noise from masquerading as saturation change. Resolution limits and qualitative comfort don't replace repeatability control.

A: Chasing phantom drive mechanisms can trigger unnecessary redevelopment. A few percent mismatch is classic when models don't share reference conditions, creating apparent imbalance without physical cause. Real aquifer or gas cap effects wouldn't hide this cleanly.

A: Underestimating drift leads to biased depletion trends and wrong development calls. Over three years, 1.5 psi drift against 60 psi depletion is noticeable but correctable. It's not noise, and it's not fatal if accounted for in surveillance planning.