Apparatus and Method for Characterizing a Reservoir
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Abstract
An apparatus and method for characterizing a subsurface formation is provided. The apparatus includes a tool body, a probe assembly carried by the tool body for sealing off a region of the borehole wall, an actuator for moving the probe assembly between a retracted position for conveyance of the tool body and a deployed position for sealing off a region of the borehole wall and a perforator extending through the probe assembly for penetrating a portion of the sealed-off region of the borehole wall. The tool may be provided with first and second drilling shafts with bits for penetrating various surfaces. The method involves sealing off a region of a wall of an open borehole penetrating the formation, creating a perforation through a portion of the sealed-off region of the borehole wall and testing the formation.
42 Citations
32 Claims
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1-6. -6. (canceled)
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7. An apparatus for characterizing a subsurface formation, comprising:
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a tool body adapted for conveyance within a borehole penetrating the subsurface formation; a probe assembly carried by the tool body for sealing off a region of the borehole wall; an actuator for moving the probe assembly between a retracted position for conveyance of the tool body and a deployed position for sealing off a region of the borehole wall; a perforator extending through the probe assembly for penetrating a portion of the sealed-off region of the borehole wall; and the probe assembly comprises a pair of inflatable packer rings each carried about axially-separated portions of the tool body and adapted for sealingly engaging axially-separated annular regions of the borehole wall. - View Dependent Claims (8)
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9-23. -23. (canceled)
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24. An apparatus for perforating a cased borehole penetrating a subsurface formation, comprising:
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a tool body adapted for conveyance within the cased borehole; a first drilling shaft having a first drill bit connected to an end thereof for perforating a portion of the casing lining the borehole wall; a second drilling shaft having a second drill bit connected to an end thereof for extending through the perforation in the casing and perforating a portion of the borehole wall; a drilling motor assembly for applying torque and translatory force to the first and second drilling shafts; and a coupling assembly for selectively coupling the drilling motor assembly to one of the first drilling shaft, the second drilling shaft, and combinations thereof. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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32. A method for perforating a cased borehole and penetrating a subsurface formation, comprising the steps of:
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perforating a portion of the casing lining the borehole wall using a drilling motor assembly and a first drilling shaft having a first drill bit connected to an end thereof; extending a second drilling shaft through the perforation in the casing using the drilling motor assembly, the second drilling shaft having a second drill bit connected to an end thereof for penetrating the formation; and perforating a portion of the borehole wall using the drilling motor assembly and the second drilling shaft with the second drill bit; the first and second drilling shafts being selectively coupled to the drilling motor assembly to execute the perforating and extending steps.
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Specification