Impulse Tests are Useful for many Other Applications. Surface casing-vent tests can be conducted using the closed-chamber method. Closed-chamber drill stem tests. Pre-frac’ evaluations and frac’ falloff tests. Alberta AER Initial Pressure requirements can be achieved with a variety
Proving Movable Reserves. In this example a high permeability sandstone overlaid a shale zone. Decline curve analysis indicated natural gas (#LNG) reserves greater than volumetrics could justify. It was hypothesized that the shale gas reserves migrated vertically, due to
Perforation Inflow Distribution Diagnostic (PIDD) Tests. The PID #welltest is analogous to production logging when two or more intervals are perforated. Based on changes to the Dp/Dt slope, gas (#LNG) inflow and AOF ratios can be estimated. Starting with
Perforation Inflow Distribution Diagnostic (PIDD) Tests. The PID #welltest is analogous to production logging when two or more intervals are perforated. Based on changes to the Dp/Dt slope, gas (#LNG) inflow and AOF ratios can be estimated. Starting with
Perforation Inflow Diagnostic (PID) Tests—Modern Analysis. Colleague Florin Hategan suggests that formation net pay (h) be replaced by effective perforated pay (hp) thus generating formation permeability (kf) such that formation flow capacity becomes (kh = kf h) (unpublished).
Perforation Inflow Diagnostic (PID) Tests—Modern Analysis. Modern analytical techniques to estimate order-of-magnitude reservoir flow characteristics (kh, s, q, p*) have been programmed into IHS WellTest™ software. Slug, PITA, or Closed Chamber diagnostics can be performed for either build-up or
Perforation Inflow Diagnostic (PID) Tests—Conventional Analysis. Using conventional #welltest analysis software, then, data before the critical flow cut-off can be analyzed as a pressure drawdown. Data following the cut-off point can be analyzed as a pressure buildup. Conventional pressure
Perforation Inflow Diagnostic (PID) Tests—Conventional Analysis. For this test, a surface #welltest data recorder was rigged in, the well was perforated, and the resulting pressure buildup was recorded. As per accepted closed-chamber #DST theory, gas inflow rates were calculated
Perforation Inflow Distribution Diagnostic (#PID) #welltests can differentiate inflow ratios in multi-layer completions. By perforating subsequently better layers, an increase in surface pressure buildup slope is equal to an increase in gas inflow. It may be necessary to blow
Perforation Inflow Diagnostic (#PID) #welltests can be conducted in high permeability systems. Analytical results are useful for testing-on-the-fly decisions, tie-in decisions and facility infrastructure planning. For specific fields and pools, correlations can be developed whereby tie-in decisions can be