E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/00 (2006.01) E21B 47/06 (2006.01) E21B 49/08 (2006.01) E21B 49/10 (2006.01)
Patent
CA 2421000
The present invention is directed to methods and apparatus for using a formation tester to perform a pretest, in a formation having low permeability, by intermittently collecting a portion of fluid at a constant drawdown rate. The drawdown pressure is monitored until a maximum differential pressure is reached between the formation and the tester. Then the piston is stopped until the differential pressure increases to a set value, at which time the piston is restarted. The controlled intermittent operation of the piston continues until a set pretest volume is reached. The modulated drawdown allows for an accurate collection of pressure versus time data that is then used to calculate the formation pressure and permeability. The present invention also finds applicability in logging-while-drilling and measurement-while drilling applications where power conservation is critical.
Proett Mark A.
Segura Pedro R.
Weintraub Preston N.
Emery Jamieson Llp
Halliburton Energy Services Inc.
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