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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2013 ERCB Annual Pressure Requirements

The ERCB has published the 2013 list of Annual Pressure Requirements. Don’t forget that surface data and acoustic well sounder (AWS) surveys are acceptable for compliance. Since we have a whole year it is a good idea to coordinate testing with a plant turnaround, a pump change, or a routine maintenance shut-in. Testing water or gas injection wells is another good tactic for sustaining oil revenues. What’s not specifically clear in G40 is that Pressure Transient Analysis (PTA) is acceptable for estimating Annual Pressure Oil and Annual...

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Diagnostic Fracture Injection Testing (DFIT)

Characterizing Reservoir Properties using Diagnostic Fracture Injection Testing (DFIT) was presented at a recent Society of Petroleum Engineers (SPE) luncheon. A great talk – and a great reservoir diagnostic test – as our example Level 2 eREPORT illustrates: DFIT2 Mini-frac’ Fall-off. But…here in Alberta…as per ERCB Bulletin 2010-38 surface (or acoustic well sounder) data are no longer acceptable for Initial Pressure Gas or Initial Pressure Oil requirements. For compliance with Initial Pressure requirements the...

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