Devices and systems for extracting drilling equipment through a drillstring

Abstract

A device and system for extracting equipment from a drillstring are disclosed. The system comprises an equipment extraction device having an anchor coupled to the equipment, a housing coupled to an uphole portion of the drillstring, and a stator tube coupled to a downhole portion of the drillstring. The anchor is comprised of an anchor extraction pin and at least one anchor claw and the equipment extraction device is detachably coupled to the stator tube.

1 . A equipment extraction device, comprising:
 an anchor coupled to the equipment, the anchor comprising:
 an anchor extraction pin; and 
 at least one anchor claw adapted to engage an interior portion of a drill string. 
   
     
     
         2 . The equipment extraction device of  claim 1 , wherein the equipment is one of a turbine-driven generator, an agitator, a measure while drill (MWD) device, a log while drill (LWD) device, a telemetry or downhole communications device, repeaters for the telemetry or communication device, instruments for measuring drillstring dynamics (e.g. torque, rotational rate, translation rate), an electrical turbine generator, a mid-string instrument cluster, an electrical generator, and combinations thereof. 
     
     
         3 . The equipment extraction device of  claim 1 , further comprising a shear pin or a spring detent detail adapted to maintain the engagement of the at least one anchor claw in the interior portion of the drill string until a force is applied significant enough to overcome the strength of the shear pin or the spring detent detail. 
     
     
         4 . The equipment extraction device of  claim 1 , further comprising a housing couplable to an uphole portion of the drillstring and a stator tube couplable to a downhole portion of the drillstring. 
     
     
         5 . The equipment extraction device of  claim 4 , wherein the interior portion of the drill string is an interior portion of the stator tube. 
     
     
         6 . The equipment extraction device of  claim 5 , wherein the at least one anchor claw is adapted to detachably engage holes, recesses, or openings in the interior portion of the stator tube. 
     
     
         7 . The equipment extraction device of  claim 4 , wherein the anchor and equipment are extractable from the housing and the stator tube. 
     
     
         8 . The equipment extraction device of  claim 7 , wherein, once the anchor and equipment are extracted, a clear bore is left in the housing and the stator tube. 
     
     
         9 . The equipment extraction device of  claim 4 , further comprising at least one slot in the stator tube, wherein drilling fluid is able to flow around the anchor and equipment, through the at least one slot, and into the stator tube. 
     
     
         10 . The equipment extraction device of  claim 1 , wherein the anchor extraction pin is adapted to be grappled from the surface. 
     
     
         11 . A system for extracting equipment from a drillstring, comprising:
 an equipment extraction device having an anchor coupled to the equipment, wherein the anchor is comprised of an anchor extraction pin and at least one anchor claw;   a housing coupled to an uphole portion of the drillstring; and   a stator tube coupled to a downhole portion of the drillstring;   wherein the equipment extraction device is detachably coupled to the stator tube.   
     
     
         12 . The system of  claim 11 , wherein the equipment is one of a turbine-driven generator, an agitator, a measure while drill (MWD) device, a log while drill (LWD) device, a telemetry or downhole communications device, repeaters for the telemetry or communication device, instruments for measuring drillstring dynamics (e.g. torque, rotational rate, translation rate), an electrical turbine generator, a mid-string instrument cluster, an electrical generator, and combinations thereof. 
     
     
         13 . The system of  claim 11 , wherein the equipment extraction device further comprises a shear pin or a spring detent detail adapted to maintain the engagement of the at least one anchor claw in an interior portion of the stator tube until a force is applied significant enough to overcome the strength of the shear pin or the spring detent detail. 
     
     
         14 . The system of  claim 11 , further comprising grappling device adapted to couple to the anchor extraction pin and extract the anchor and equipment from the drillstring. 
     
     
         15 . The system of  claim 11 , further comprising multiple anchors each coupled to a different piece of equipment. 
     
     
         16 . The system of  claim 11 , wherein the at least one anchor claw is adapted to detachably engage holes, recesses, or openings in the interior portion of the stator tube. 
     
     
         17 . The system of  claim 11 , wherein the anchor and equipment are extractable from the housing and the stator tube. 
     
     
         18 . The system of  claim 17 , wherein, once the anchor and equipment are extracted, a clear bore is left in the housing and the stator tube. 
     
     
         19 . The system of  claim 11 , further comprising at least one slot in the stator tube, wherein drilling fluid is able to flow around the anchor and equipment, through the at least one slot, and into the stator tube. 
     
     
         20 . The system of  claim 11 , wherein anchor and equipment are extractable without removing the drillstring.