Perforation Inflow Diagnostic (PID) tests satisfy ERCB Initial Pressure requirements. These simplified tests, now in common usage, provide an economical alternative to traditional methods. Basically the well is perforated under-balanced, and the subsequent closed chamber pressure build-up is monitored with subsurface pressure recorders. Data are then analyzed using impulse or closed-chamber theory (PITA) to generate a p*.
What’s not specifically clear in G40 is that Pressure Transient Analysis (PTA) is acceptable for estimating Initial Pressure Oil and Initial Pressure Gas conditions. The build-up does not have to pass the 2 kPa Rule, nor does the well have to be shut-in >14 days. A minimum 8 h of data is required, but typically tests are run from 48 – 196 h, depending on your completion operation logistics. The Board will accept PAS files flagged as analyzed with an input extrapolated reservoir pressure (p*):
~TEST DATA,INTRP.,Y,Test Interpretation Present
~PRESSURE RESULTS – SUMMARY,PEXTR.KPAA,9558.00,Representative Extrap/ False Pressure
Please give us a call to discuss tactics specific to your completion operations.