Apparatus and method of anchoring and releasing from a packer

An apparatus for anchoring to and releasing from a downhole device of the type having threads in the upper end thereof, said apparatus comprising:

• a stinger adapted for insertion into the downhole device;
• a collet slidably disposed on said stinger and having a plurality of collet fingers, said collet defining threads thereon adapted for engaging the threads in said downhole device;
• a shear ring shearably attached to said stinger and adapted for engaging an end of said collet fingers such that said threads on said collet are held in engagement with said threads in said downhole device;
• and
• a splined load ring attached to said stinger and having splines extending therefrom between said collet fingers such that torque applied to said stinger is transmitted to said collet.

An apparatus for anchoring to and releasing from a downhole device of the type having threads in the upper end thereof, said apparatus comprising:

• a stinger adapted for insertion into the downhole device;
• a collet slidably disposed on said stinger and having a plurality of collet fingers, said collet defining threads thereon adapted for engaging the threads in said downhole device;
• a shear ring attached to said stinger and adapted for engaging an end of said collet fingers such that said threads on said collet are held in engagement with said threads in said downhole device;
• and
• a splined load ring attached to said stinger and having splines extending therefrom between said collet fingers such that torque applied to said stinger is transmitted to said collet, and said load ring having an upper end adapted for engaging said collet after a predetermined tension has been applied to said stinger.

A method of anchoring a work string to a packer set in a wellbore and releasing the work string from the packer, said method comprising the steps of:

• stinging an anchoring apparatus into the packer;
• engaging collet fingers on said anchoring apparatus with a threaded surface in the packer;
• holding said collet fingers in engagement with said threads in said packer by engaging an engaging means with said collet fingers;
• rotating the work string such that torque is applied to said collet fingers without applying torque to said engaging means;
• and
• applying tension to the work string for releasing said engaging means such that said collet fingers may be disengaged from said threads in said packer.

An apparatus for anchoring to and releasing from a downhole device of the type having threads in the upper end thereof, said apparatus comprising:

• a stinger adapted for insertion into the downhole device;
• thread mating means for threadingly engaging said stinger with the threads in said downhole device, said thread mating means being characterized by a collet having a plurality of collet fingers adapted for engagement with said thread in said downhole device;
• engaging means for engaging said thread mating means such that said thread mating means is held in engagement with said threads in said downhole device;
• and
• means for transmitting torque from said stinger to said mating means without transmitting torque to said engaging means, said means for transmitting torque being characterized by a load ring threadingly engaged with said stinger and having a spline extending therefrom between adjacent collet fingers such that rotation of said stinger and lock ring results in rotation of said collet, said load ring having an upper end adapted for engaging said collet after a predetermined tensile load has been applied to said stinger.

An apparatus for anchoring to and releasing from a downhole device of the type having threads in the upper end thereof, said apparatus comprising:

• a stinger adapted for insertion into the downhole device;
• a collet slidably disposed on said stinger and having a plurality of collet fingers, said collet defining threads thereon adapted for engaging the threads in said downhole device;
• a shear ring shearably attached to said stinger and adapted for engaging an end of said collet fingers such that said threads on said collet are held in engagement with said threads in said downhole device, said shear ring being releasable in response to a predetermined tension applied to said stinger;
• and
• a splined load ring attached to said stinger and having splines extending therefrom between said collet fingers such that torque applied to said stinger is transmitted to said collet.

An apparatus for anchoring to and releasing from a downhole device of the type having threads in the upper end thereof, said apparatus comprising:

• a stinger adapted for insertion into the downhole device;
• a collet slidably disposed on said stinger and having a plurality of collet fingers, said collet defining threads thereon adapted for engaging the threads in said downhole device;
• a shear ring attached to said stinger by a shear pin and adapted for engaging an end of said collet fingers such that said threads on said collet are held in engagement with said threads in said downhole device;
• and
• a splined load ring attached to said stinger and having splines extending therefrom between said collet fingers such that torque applied to said stinger is transmitted to said collet.