Mud cake probe extension apparatus and method
First Claim
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1. An apparatus, comprising:
- a downhole tool configured for conveyance within a wellbore extending into a subterranean formation, the downhole tool comprising;
a probe assembly comprising an inlet having one or more filter openings, a packer comprising an elastomeric material surrounding the inlet, and a filter piston actuatable between an extended position and a retracted position and having an external end, wherein;
in the extended position, the external end protrudes past the inlet to form an opening in the subterranean formation and substantially close the filter openings in the inlet; and
in the retracted position, the filter piston is retracted within the inlet to expose the filter openings to the subterranean formation through the opening.
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Abstract
In a formation pressure tester tool, an elongated filter piston possibly having a tapered or sharp edge configured to penetrate mud cake while the probe is being set. At the end of the setting sequence, the filter piston is retracted, thus opening a flowpath from the formation, through the mudcake, to the probe.
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Citations
20 Claims
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1. An apparatus, comprising:
a downhole tool configured for conveyance within a wellbore extending into a subterranean formation, the downhole tool comprising; a probe assembly comprising an inlet having one or more filter openings, a packer comprising an elastomeric material surrounding the inlet, and a filter piston actuatable between an extended position and a retracted position and having an external end, wherein; in the extended position, the external end protrudes past the inlet to form an opening in the subterranean formation and substantially close the filter openings in the inlet; and in the retracted position, the filter piston is retracted within the inlet to expose the filter openings to the subterranean formation through the opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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positioning a downhole tool within a wellbore extending into a subterranean formation, wherein the downhole tool comprises; a probe assembly comprising an inlet having a one or more filter openings, a packer comprising an elastomeric material surrounding the inlet, and a filter piston actuatable between an extended position and a retracted position and having an external end; engaging the probe assembly with a wall of the wellbore, such that the inlet is positioned proximate a mudcake lining the wellbore wall; translating the filter piston to the extended position, such that the external end protrudes past the inlet to form an opening in the subterranean formation and substantially close the filter openings in the inlet; and translating the filter piston to the retracted position, such that the filter piston is retracted within the inlet to expose the filter openings to the subterranean formation through the opening. - View Dependent Claims (17, 18, 19, 20)
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Specification