Spring Break-up

Time to plan for our #AER Annual Pressure Requirements. Surface pressure recorders are fine for an annual #welltest — the caveat for gas (#LNG) wells being that there cannot be a liquid level above the top perforation. Measuring the flowing, pumping, or injecting pressure before shut-in is critical for #PTA. Typical shut-in times are 48 – 196 h, depending on matrix permeability (k). Shut-in times do not have to comply with the 2 kPa/h or >14 Day Rules if PTA is used to extrapolate p*. Testing water, gas, or miscible flood injection...

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Spring Break-up

Time to plan for our #AER Annual Pressure Requirements. D40, section 4.5.7, states that  “…the minimum number of pressure surveys should equal about 25 % of a pool’s producing well count. Based on quarter section spacing for oil pools this translates to one survey per productive section. For gas pools, one survey per four productive sections is required.”  Referencing ‘one survey (#welltest) per X productive sections’ is confusing for large gas (#LNG) plays which have not been fully drilled up. In these low density, or low...

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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...

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Spring Break-up

A great time to get miscellaneous, low priority #welltest projects off your desk. It’s also when we should be planning for our #AER Annual Pressure Requirements. Plan ahead to coincide with a scheduled plant turn-around, routine maintenance program, or pump change. If we are coordinating a pressure survey with turn-around, we want all the pressure recorders installed a day-or-two beforehand, then we put the wells back on production, ready for the field-wide shut-down. This especially adds value to #LNG plays with near wellbore condition...

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More on Alberta Annual Pressure Survey Requirements

ERCB–D40, section 4.5.7, states that “…the minimum number of pressure surveys should equal about 25 % of a pool’s producing well count, based on quarter section spacing for oil pools. This translates to one survey per productive section. For gas pools, one survey per four productive sections is required. The reference to “one survey per X productive sections” can be confusing, especially in large gas pools which have not been fully drilled up. In these low density, or low well count pools, surveying 25 % of the drilled...

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