Spring Break-up
Time to get low priority #welltest odds-and-ends off your desk. It’s also when we should be planning for our #AER Annual Pressure Requirements. Popular annual welltest methods include acoustic well sounder (AWS) for pumping oil wells, and surface pressure build-up tests for gas (#LNG) wells. If pressure transient analysis (#PTA) is conducted for p* the 2 kPa/h and >14 day Rules are waived. In other words, with a minimum eight hours (8 h) of transient pressure data, it doesn’t matter whether-or-not the test meets the 2 kPa Rule. If the data are analyzable the p* will be compliant.
Comments
Hi,
I work with PDO in Oman. I wonder if the AWS can measure P* in our deep gas condensate wells. The depth can reach more than 5000 meters. How long shut-in period is required knowing that it is a tight gas formation of 0.01 to 0.1 md.
Thanks,
Adel Hammouda
Howdy Adel, I’d recommend a few trials to calibrate bottom hole pressure calculations and friction effects – i.e. run concurrent subsurface and AWS (surface) tests a couple of times to see if they corroborate. Tight gas might take several weeks to achieve middle-time radial flow, analogous well tests would help with scheduling. Or consider Rate Time Analysis (RTA) on the long-term production data – which is best if you have surface pressure data. Later, David.