Autonomous formation pressure test process for formation evaluation tool
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United States of America Patent
Stats
-
Sep 23, 2014
Issued Date -
N/A
app pub date -
Jul 22, 2011
filing date -
Jul 22, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A formation tester places an isolation device, preferably a probe, in fluid communication with a formation to determine formation pressures. The tester's controller uses a pressure pre-test process to autonomously control operation. The controller measures drawdown pressure and interval as the tester draws down pressure in flowline coupled to the probe. If the drawdown pressure indicates a dry test has occurred, the process is aborted. Otherwise, the controller measures buildup pressure and interval by allowing buildup of pressure of the flowline. The controller permits this to continue until the interval is longer than the drawdown interval and/or until a rate of the buildup falls below a predetermined rate. If the buildup pressure is too tight relative to the drawdown pressure, the controller aborts the test. Eventually, the controller measures a final buildup pressure when the buildup terminates. A new drawdown rate and volume can be determined for subsequent formation tests.
First Claim
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Family
International Classification(s)
- 2011 Application Filing Year
- E21B Class
- 2545 Applications Filed
- 2297 Patents Issued To-Date
- 90.26 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 5 Citation Count
- E21B Class
- 5.02 % this patent is cited more than
- 11 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Mar 23, 2026 |
