E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/08 (2006.01) E21B 49/10 (2006.01)
Patent
CA 2535054
A method is disclosed for estimating a formation pressure using a formation tester disposed in a wellbore penetrating a formation, said method comprising: (a) establishing fluid communication between a pretest chamber in the downhole tool and the formation via a flowline, the flowline having an initial pressure therein; (b) moving a pretest piston in a controlled manner in the pretest chamber to reduce the initial pressure to a drawdown pressure during a drawdown phase; (c) terminating movement of the piston to permit the drawdown pressure to adjust to a stabilized pressure during a build-up phase and measuring simultaneously in relation to time, pressure P(t) and temperature T(t) in the pretest chamber; (d) extracting an index i(t) dependent of the pressure P(t) and the temperature T(t) informing on the build-up phase; (e) analyzing index i(t) and repeating steps (b) - (d) or going to step (f); (f) determining the formation pressure based on a final stabilized pressure in the flowline. And more generally a method could be used for estimating type of a build up pressure phase, the build up pressure phase being done after a drawdown pressure phase, said both drawdown and build up phases being done to determine formation pressure using a formation tester disposed in a wellbore penetrating a permeable formation, said permeable formation being able to create a formation flow, said method being characterized by using an index to determine the contribution of formation flow on the pressure build up phase.
Liger Francois
Manin Yves
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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