Welltest 101: Wireline (Slickline) Reporting

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) In British Columbia (BC) all test data and applicable pressure transient analyses (#PTA) must be submitted, as per requirements of Section 95 of the Drilling and Production Regulation. Well testing requirements are further detailed in Section 6.7 of the British...

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Welltest 101: Wireline (Slickline) Reporting

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...

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Welltest 101: Wireline (Slickline) Reporting

Differentials should be created for both #welltest pressure and temperature traces, for quality control and data validation. Liquid shifts are most clearly exhibited by differential diagnostics. Drift is also evident from the differential. Every effort should be undertaken to identify an erroneous or malfunctioning pressure gauge. The final test pressure should be taken immediately prior to purging the lubricator, since this operation causes a slight flow, effectively ending the buildup. Purging the lubricator at the end of the test is...

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Welltest 101: Wireline (Slickline) Reporting

Temperature data are a primary #welltest measurement (i.e. not calculated like pressure data) and should be examined for quality control and anomalies. Temperature data are a good indicator of wellbore and reservoir characteristics. Joule-Thompson cooling usually dominates flowing temperatures in gas wells (#LNG) as a function of gas expansion through pore throats or perforations. If the magnitude of cooling decreases  (becomes less cool) then the near wellbore region might be cleaning up. With recorders landed above the...

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Welltest 101: Wireline (Slickline) Reporting

Pressure buildup data should always be examined for #welltest analysis (#PTA) quality control and anomalies. Several phenomena might cause data anomalies immediately after shut-in. Phase redistribution (gas going back into solution) can cause a hump in the early-time data. Liquid fill-up can cause a drop in pressures (changing from gas above the formation to a liquid head). A falling liquid level may cause a sudden increase in pressures, as the column between recorders and formation changes from liquid to gas. One might also...

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