Apparatus and method for characterizing a reservoir
First Claim
1. An apparatus for perforating a cased borehole penetrating a subsurface formation, comprising:
- 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, wherein the coupling coupling assembly comprises a gear assembly operatively connected to both the first and second drilling shafts.
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Accused Products
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.
39 Citations
15 Claims
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1. 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, wherein the coupling coupling assembly comprises a gear assembly operatively connected to both the first and second drilling shafts. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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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9. An apparatus for perforating a borehole penetrating a subsurface formation, comprising:
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a tool body adapted for conveyance within the borehole; a first drilling shaft having a first drill bit; a second drilling shaft having a second drill bit; a mover configured to apply torque and translatory force to the first and second drilling shafts; and a coupling assembly configured to selectively couple the mover to one of the first and second drilling shafts. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification