Casing puller

摘要

A casing puller includes a body and at least one arm. The body has first and second ends, at least one end connectable to a drill pipe. The body defines a longitudinal axis and sized for insertion into a casing pipe. The at least one arm is disposed on the body and moves between a stowed position and a deployed position. The at least one arm extends away from the longitudinal axis when in its deployed position and is arranged to engage an arm receiver defined by the casing pipe.

主权项

1. A method comprising:
inserting a casing puller into a casing pipe, the casing puller comprising:
a body having first and second ends, at least one end connectable to a drill pipe, the body defining a longitudinal axis and sized for insertion into the casing pipe; andat least one arm disposed on the body and moving between a stowed position and a deployed position, the at least one arm extending away from the longitudinal axis when in its deployed position and arranged to engage an arm receiver defined by the casing pipe;wherein the body comprises:
a stem extending along the longitudinal axis; andfirst and second fins disposed on the stem and extending away from the longitudinal axis, each fin circumferentially spaced from the other about the stem and defining a receptacle housing a respective arm; moving the at least one arm to its deployed position to engage an a receiver defined by the casing pipe; moving the casing puller in a first direction wherein the deployed at east one arm maintains engagement with the arm receiver of the casing pipe; and moving the casing puller in a second direction, causing the at least one arm to move to its stowed position, disengaging the at least one arm from the arm receiver of the pipe casing.