Coring tool and method
First Claim
1. A coring tool for use in a borehole formed in a subterranean formation, comprising:
- a tool housing adapted for suspension within the borehole at a selected depth;
a coring aperture formed in the tool housing;
a core receptacle disposed in the tool housing;
a bit housing disposed within the tool housing;
a coring bit mounted within a coring bit assembly, the coring bit assembly being movably disposed in the bit housing;
a bit motor operably coupled to the coring bit and adapted to rotate the coring bit;
a series of pivotably connected extension link arms;
a first piston adapted to actuate the coring bit between the retracted and extended positions;
a first rotation link arm having a first end pivotably coupled to the tool housing and a second end pivotably coupled to the bit housing to rotate the bit housing between an eject position, in which the coring bit registers with the core receptacle, and a coring position, in which the coring bit registers with the tool housing coring aperture;
a second rotation link arm having a first end pivotably coupled to the tool housing and a second end pivotably coupled to the bit housing thereby to further control rotation of the bit housing between the eject and coring positions; and
a second piston operably coupled to the bit housing and adapted to actuate the bit housing between the eject and coring positions;
wherein the series of extension link arms comprises;
a scissor jack;
a follower link arm; and
a rocker arm pivotably mounted on the bit housing and having a first segment pivotably coupled to the follower link arm and a second segment pivotably coupled to the scissor jack.
1 Assignment
0 Petitions
Accused Products
Abstract
A coring tool for use in a borehole formed in a subterranean formation includes a tool housing with a coring aperture and a core receptacle. A coring bit is mounted within the tool housing and movable between retracted and extended positions by a series of pivotably connected extension link arms. Another set of link arms rotates the coring bit between coring and eject positions. The coring tool may also include a multi-column core storage magazine with shifters to move cores or core holders between columns. The coring tool may be used to measure core lengths during operation and facilitates retrieval of cores having larger lengths and diameters than conventional sidewall coring tools.
28 Citations
16 Claims
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1. A coring tool for use in a borehole formed in a subterranean formation, comprising:
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a tool housing adapted for suspension within the borehole at a selected depth; a coring aperture formed in the tool housing; a core receptacle disposed in the tool housing; a bit housing disposed within the tool housing; a coring bit mounted within a coring bit assembly, the coring bit assembly being movably disposed in the bit housing; a bit motor operably coupled to the coring bit and adapted to rotate the coring bit; a series of pivotably connected extension link arms; a first piston adapted to actuate the coring bit between the retracted and extended positions; a first rotation link arm having a first end pivotably coupled to the tool housing and a second end pivotably coupled to the bit housing to rotate the bit housing between an eject position, in which the coring bit registers with the core receptacle, and a coring position, in which the coring bit registers with the tool housing coring aperture; a second rotation link arm having a first end pivotably coupled to the tool housing and a second end pivotably coupled to the bit housing thereby to further control rotation of the bit housing between the eject and coring positions; and a second piston operably coupled to the bit housing and adapted to actuate the bit housing between the eject and coring positions; wherein the series of extension link arms comprises; a scissor jack; a follower link arm; and a rocker arm pivotably mounted on the bit housing and having a first segment pivotably coupled to the follower link arm and a second segment pivotably coupled to the scissor jack. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus, comprising:
a coring tool configured for conveyance within a wellbore extending into a subterranean formation, wherein the coring tool comprises; a tool housing extending along a longitudinal axis and defining a coring aperture through which core samples are retrieved; a coring assembly disposed within the tool housing and comprising; a bit housing rotatably coupled to the tool housing; a coring motor mounted on the bit housing and configured to rotate the coring bit; a coring bit assembly disposed in the bit housing and comprising the coring bit; upper and lower rotation link arms each including a first end pivotably coupled to the bit housing and a second end pivotably coupled to the tool housing; a rotation piston configured to rotate the bit housing 156 between eject and coring positions; an extension piston; and a plurality of extension link arms comprising; a yoke adapted for coupling to the extension piston; a follower pivotably coupled to the yoke; a rocker arm pivotably mounted on the bit housing and comprising;
a first segment pivotably coupled to the follower; and
a second segment; anda scissor jack pivotably coupled to the rocker arm and comprising;
a bit arm pivotably coupled to the rocker arm second segment and further pivotably coupled to the coring bit assembly; and
a housing arm having a first end pivotably coupled to the bit arm and a second end pivotably coupled to the bit housing.- View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification