Patent ID: 8550160

Claim:
A method for measuring properties of a formation with a borehole extending there through including: disposing a formation tester within the borehole, the formation tester including: a cylinder with a drawdown piston slideably disposed therein, the drawdown piston translatable from a first position toward a second position at a specified flow rate to draw formation fluid into the cylinder; and a sealing assembly extendable into engagement with the borehole wall that isolates an area of the borehole wall from borehole fluid with the isolated area hydraulically connected to the cylinder; a pressure sensor to measure pressure at one of the sealing assembly and the cylinder; and performing a test sequence, including: extending the sealing assembly into engagement with the borehole wall; drawing formation fluid into the formation tester through the sealing assembly by translating the drawdown piston toward the second position; injecting the formation fluid back into the formation through the sealing assembly by translating the drawdown piston from the second position toward the first position to an intermediate position such that the fluid pressure in the sealing assembly after the translation of the piston exceeds the formation pressure, and thereafter holding the piston in the intermediate position for a period of time and measuring pressure; and determining a property of the formation.