Downhole tool including related lug slots and lugs for coupling a milling tool and whipstock assembly

Abstract

Provided is a milling tool, a whipstock assembly, a well system, and a method. The milling tool, in at least one aspect, includes a plurality of blades extending radially outward from a mill body, each of the plurality of blades having a primary surface and first and second side surfaces coupled to opposing sides of the primary surface, adjacent blades of the plurality of blades separated by a spacing. The milling tool may further includes a lug slot extending partially into one of the plurality of blades from the first side surface exposed by the spacing, the lug slot configured to engage with a lug of a related tool to couple the milling tool with the related tool when rotating in a first direction and to disengage from the lug of the related tool to release the milling tool from the related tool when rotating in a second opposite direction.

What is claimed is: 
     
         1 . A whipstock assembly, comprising:
 a whipstock body having an uphole end and a downhole end, the whipstock body defining a taperface; and   a lug coupled proximate the uphole end of the whipstock body, the lug configured to engage with a lug slot of a related milling tool to couple the whipstock assembly with the related milling tool when the milling tool rotates in a first direction and to disengage from the lug slot of the related milling tool to release the whipstock assembly from the related milling tool when the milling tool rotates in a second opposite direction.   
     
     
         2 . The whipstock assembly as recited in  claim 1 , wherein the lug has a smaller lug portion and a larger lug portion, the smaller lug portion more proximate the whipstock body than the larger lug portion. 
     
     
         3 . The whipstock assembly as recited in  claim 2 , wherein the lug is a T-shaped lug, the smaller lug portion coupled to the whipstock body. 
     
     
         4 . The whipstock assembly as recited in  claim 1 , wherein the lug is a first lug, and further including a second lug coupled proximate the uphole end of the whipstock body. 
     
     
         5 . The whipstock assembly as recited in  claim 4 , wherein a centerline taken through the first lug and the second lug is angled relative to a longitudinal centerline of the whipstock body. 
     
     
         6 . The whipstock assembly as recited in  claim 5 , wherein an angle (θ 3 ) between the centerline taken through the first lug and the second lug and the longitudinal centerline is substantially identical to an angle (θ 1 ) of a plurality of blades of the related milling tool that the whipstock assembly is configured to engage. 
     
     
         7 . The whipstock assembly as recited in  claim 1 , wherein the lug is integrally formed with the whipstock body. 
     
     
         8 . The whipstock assembly as recited in  claim 1 , wherein the lug is coupled to the whipstock body via an opening in the whipstock body. 
     
     
         9 . The whipstock assembly as recited in  claim 8 , wherein a fastener extends at least partially into the opening to couple the lug to the whipstock body. 
     
     
         10 . The whipstock assembly as recited in  claim 1 , wherein the lug is coupled to a concave portion of the whipstock body.