In Canada, petroleum well testing is mandated and controlled by provincial boards, each with a variety of rules, regulations, and submission requirements:
- Alberta Energy Regulator (AER)
- British Columbia Oil and Gas Commission (BC-OGC)
- Saskatchewan Industry and Resources (SIR)
Alberta has the most stringent #welltest requirements, and one should be thoroughly familiar with Oil and Gas Conservation Act sections 151 & 71, AER published guides G3, G5, G40 and G60 as well as General Bulletins 2003-01, 2003-05, and especially 2003-15 (the PAS file mnemonic guide).
All wireline data, reports and pressure transient analyses (#PTA) are required to be submitted to the AER, in electronic format, via their web site, as PAS files (pressure ASCII standard). The GRD.pas file supports gradient and acoustic surveys while the TRG.pas file supports extended or flow and buildup/falloff tests (with or without PTA).
There are numerous checks to validate PAS data. In particular, there is a check to verify if data can be submitted with or without PTA, known as the “2 kPa Rule”.
•Note that, to be submitted without PTA, G40 requires pressures building less than 2 kPa/h — but the Board’s computer has built-in leniency, and checks for pressures building less than 2.5 kPa/h, to pass submission requirements.
•Stand-alone static gradient surveys are checked over the last 2 h on-bottom time for compliance with the 2 kPa/h rule.
•Extended tests and buildup tests are checked over the last 6 h on-bottom time for compliance with the 2 kPa/h rule.
Despite the Board’s attempts to ensure data quality, through computer validation checks, there are loopholes allowing false representation. All purchased AER.pas files should thus be reviewed by a qualified welltest interpretation and pressure transient analysis expert.