In situ measurements in formation testing to determine true...

Details In situ measurements in formation testing to determine true... In situ measurements in formation testing to determine true...

G - Physics

01

V

G01V 3/20 (2006.01)

Patent

CA 2668437

A borehole formation testing system that measures resistivity of near borehole formation in situ rather than the measuring resistivity of fluid drawn into a formation tester tool. A radially extendable probe assembly contacts and forms a hydraulic seal with the wall of a borehole using a pad. Electrode contacts are disposed on the contact surface of the pad and electrically contact the near borehole formation. Response of the electrode contacts are used to determine resistivity of the near borehole formation. This resistivity is with a deeper formation resistivity measurement to determine if virgin formation fluid is at or in the vicinity of the pad. Alternately, a plurality of resistivity measurements is made at the formation tester pad and virgin formation fluid at or near the pad is determined from the rate of change of the plurality of resistivity measurements.

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