Apparatus and Method for Positioning Extended Lateral Channel Well Stimulation Equipment

Abstract

Disclosed is a movable boring assembly and a boring tool positioner for drilling a plurality of holes in a well casing and jetting a well production zone through the plurality of holes. All of the holes can be drilled in the casing at different angular positions, as well as different levels within the casing. The drilling tool can then be removed and a perforation jet can be reliably and accurately reoriented into the drilled holes to perforate a production zone in multiple directions and at multiple levels.

1 . A movable boring assembly for drilling a plurality of holes in a well casing and jetting a well production zone through said plurality of holes at a plurality of levels and in a plurality of directions comprising:
 a boring tool positioner that orients a drill tool to cut a plurality of holes in a plurality of directions in a well casing and orient a perforation jet in said plurality of holes to perforate a well production zone in said plurality of directions;   an antirotation mandrel coupled to a lower end of said boring tool positioner; and   a bow spring anchor that engages said antirotation mandrel to prevent said boring tool positioner from rotating.   
     
     
         2 . The movable boring assembly of  claim 1 , further comprising an anchor assembly that anchors said boring tool positioner at a predetermined level in said well. 
     
     
         3 . The movable boring assembly of  claim 1  wherein said boring tool positioner comprises:
 a housing sleeve having a plurality of apertures distributed at different locations on said housing sleeve; 
 a tool guide cylinder positioned rotatably in said housing sleeve that orients said drill tool and said perforation jet with said plurality of apertures; 
 an angular positioner that controls rotational movement of said tool guide cylinder in said housing sleeve in a manner that causes a releasable, self-latching engagement between said tool guide cylinder and said housing sleeve to accurately and repeatably align said tool guide cylinder with said housing sleeve so that said drill tool and said perforation jet are accurately and repeatably aligned with said plurality of apertures. 
 
     
     
         4 . The movable boring assembly of  claim 3  wherein said angular positioner comprises one or more of:
 a ratchet and paw; 
 a spring-loaded ball and detent; and 
 a retractable tapered pin and mating tapered aperture. 
 
     
     
         5 . The movable boring assembly of  claim 3  wherein said tool guide cylinder has a curved channel that extends from a proximal end of said tool guide cylinder, and is substantially centered on a longitudinal axis of said tool guide cylinder, to a distal end and exists said tool guide cylinder at an angle of approximately 90° to said axis. 
     
     
         6 . The movable boring assembly of  claim 5  further comprising:
 a socket disposed at said tool guide cylinder that receives and guides said drill tool and said perforation jet into and through said curved channel. 
 
     
     
         7 . The movable boring assembly of  claim 6  wherein said socket further comprises a center bore that receives and retains a drill motor, longitudinal slots formed in said socket along said center bore, spiral shoulders formed on said proximal end of said socket in said center bore that engage radially extending ears from a transmission of said drill motor. 
     
     
         8 . The movable boring tool assembly of  claim 7  further comprising:
 a support that connects said boring tool positioner to a tubing string that extends to the surface of said well. 
 
     
     
         9 . The movable boring tool assembly of  claim 8  wherein said support comprises a carrier pipe. 
     
     
         10 . The movable boring tool assembly of  claim 8  further comprising:
 a boring tool positioner bow spring anchor that is coupled to said housing sleeve that holds said housing to said well casing to prevent rotation and centers said boring tool positioner in said well casing. 
 
     
     
         11 . An apparatus comprising:
 a tool guide cylinder positioned rotatably in a housing sleeve that orients a drill tool and a perforation jet with a plurality of apertures distributed around a circumferential wall on said housing sleeve;   an angular positioner that aligns said tool guide cylinder with said housing sleeve so that said drill tool and said perforation jet are aligned with said plurality of apertures.   
     
     
         12 . The boring tool positioner of  claim 11  wherein said angular positioner comprises one or more of:
 a ratchet and paw; 
 a spring-loaded ball and detent; and 
 a retractable tapered pin and mating tapered aperture. 
 
     
     
         13 . The boring tool positioner of  claim 11  wherein said tool guide cylinder has a curved channel that extends from a proximal end of said tool guide cylinder, and is substantially centered on a longitudinal axis of said tool guide cylinder, to a distal end and exists said tool guide cylinder at an angle of approximately 90° to said axis. 
     
     
         14 . The boring tool positioner of  claim 13  further comprising:
 a socket disposed at said tool guide cylinder that receives and guides said drill tool and said perforation jet into and through said curved channel wherein said socket further comprises a center bore that receives and retains a drill motor, longitudinal slots formed in said socket along said center bore, spiral shoulders formed on said proximal end of said socket in said center bore that engages radially extending ears from a transmission of said drill motor. 
 
     
     
         15 . The boring tool positioner of  claim 14  further comprising:
 a support that connects said boring tool positioner to a tubing string that extends to the surface of said well. 
 
     
     
         16 . The boring tool positioner of  claim 15  further comprising:
 a boring tool positioner bow spring anchor that is coupled to said housing sleeve that holds said housing to said well casing to prevent rotation and centers said boring tool positioner in said well casing. 
 
     
     
         17 . A method comprising:
 providing a housing sleeve having a plurality of apertures distributed around a circumferential wall of said housing sleeve;   holding said housing sleeve so that said housing sleeve does not rotate in a well; and   aligning a tool guide cylinder in said housing sleeve so that a drill tool and a perforation jet are aligned with said apertures.   
     
     
         18 . The method of  claim 17  wherein said process of holding said housing sleeve comprises:
 anchoring said housing sleeve to said well casing. 
 
     
     
         19 . The method of  claim 18  wherein said process of holding said housing sleeve comprises:
 anchoring an antirotational mandrel to said well casing that allows said housing sleeve to be moved vertically in said well but prevents rotational movement of said housing sleeve. 
 
     
     
         20 . The method of  claim 19  wherein said process of aligning said tool guide cylinder in said housing sleeve comprises:
 using an angular positioner that releasably sets an angular position of said tool guide cylinder in said housing sleeve using a self-latching mechanism.