| CPC E21B 47/06 (2013.01) [E21B 49/008 (2013.01); E21B 49/087 (2013.01); E21B 49/10 (2013.01)] | 21 Claims |
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9. A method comprising:
positioning a formation tester tool into a borehole formed within a formation;
radially expanding a first radially extendable inner packer, a second radially extendable outer packer, a third radially extendable inner packer, and a fourth radially extendable outer packer of the formation tester tool out from the formation tester tool to the formation to form a sealed volume between the first radially extendable inner packer and the third radially extendable inner packer and to form a sealed connection volume between the formation and a pressure sensor of the formation tester tool;
iteratively performing drawdown tests on the sealed volume to determine a formation pressure estimate, the iterative drawdown tests including
lowering, in a first iteration, a pressure of the sealed volume to be within a first pressure range based on a borehole pressure and an initial measurement of a pressure of the sealed connection volume, and
lowering, in one or more later iterations, the pressure of the sealed volume to be within a second pressure range based on the pressure of the sealed connection volume at a preceding iteration; and
in response to a determination that the pressures of the sealed volume during the iterative drawdown tests shows a trend in a formation pressure value, generating a formation property prediction based on the trend.
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