Power retrieving tool

Abstract

Apparatuses and methods for retrieving a tool or bottom hole assembly. The apparatus may include a latching device that couples to a tool or bottom hole assembly to be retrieved and at least one seal extending radially from the apparatus to engage an inner diameter of a tubular, such as a casing string. A pump inlet is disposed in or through an outer surface of the apparatus uphole of the at least one seal. A pump outlet is disposed in or through an outer surface of the apparatus downhole of the at least one seal. The apparatus may also include a pump for pumping a drilling fluid from the pump inlet to the pump outlet in order to generate a differential pressure across the at least one seal and provide a hydraulic force to effect retrieval of the tool or bottom hole assembly.

What is claimed is: 
     
         1 . An apparatus for retrieving one of a tool and a bottom hole assembly, comprising:
 a latching device arranged and designed to couple to a tool or bottom hole assembly to be retrieved;   at least one seal extending radially from the apparatus and configured to engage an inner diameter of a tubular;   a pump inlet disposed in an outer surface of the apparatus uphole of the at least one seal;   a pump outlet disposed in an outer surface of the apparatus downhole of the at least one seal; and   a pump for pumping a drilling fluid from the pump inlet to the pump outlet to generate a differential pressure across the at least one seal and provide a hydraulic force to effect retrieval of the tool or bottom hole assembly.   
     
     
         2 . The apparatus of  claim 1 , wherein the at least one seal includes a downward facing packer cup configured to sealingly engage the inner diameter of the tubular during the retrieval operation. 
     
     
         3 . The apparatus of  claim 1 , wherein the at least one seal includes an upward facing packer cup configured to sealingly engage the inner diameter of the tubular during and allow the apparatus to be pumped downhole. 
     
     
         4 . The apparatus of  claim 1 , further comprising an electric wireline configured to provide at least one of the following:
 power to an electric motor to operate the pump;   communications to a control module for monitoring or controlling retrieval operations; and   application of additional upward force to the apparatus.   
     
     
         5 . The apparatus of  claim 4 , wherein the control module has external wickers thread. 
     
     
         6 . The apparatus of  claim 1 , further comprising a pressure measurement system arranged and designed to determine a differential pressure across the at least one seal. 
     
     
         7 . A method of retrieving a tool or a bottom hole assembly, comprising:
 coupling a retrieval apparatus to one of a tool and a bottom hole assembly to be retrieved, the retrieval apparatus having at least one seal extending radially therefrom and configured to sealingly engage an inner diameter of a tubular; and   pumping fluid from an inlet of the retrieval apparatus positioned uphole of the at least one seal to an outlet of the retrieval apparatus positioned downhole of the at least one seal to generate a differential pressure across the at least one seal and provide a hydraulic force to effect retrieval of the tool or bottom hole assembly.   
     
     
         8 . The method of  claim 7 , further comprising deploying the retrieval apparatus downhole and engaging a drill lock assembly or tool lock assembly. 
     
     
         9 . The method of  claim 8 , wherein the deploying comprises pumping the retrieval apparatus downhole. 
     
     
         10 . The method of  claim 7 , wherein the tubular is a casing string and the method further comprising sealingly engaging an inner diameter of the casing string via the at least one seal. 
     
     
         11 . The method of  claim 7 , further comprising pulling a wireline coupled to the retrieval apparatus to provide additional upward force to the retrieval apparatus. 
     
     
         12 . The method of  claim 7 , further comprising at least one of measuring and controlling the differential pressure. 
     
     
         13 . The method of  claim 7 , further comprising adding fluid to the casing string above the retrieval apparatus. 
     
     
         14 . A method of circulating fluids during a wireline retrieval operation, comprising:
 flowing fluid through a casing string to an inlet of a retrieval apparatus; and   pumping fluid from the inlet to an outlet of the retrieval apparatus to:
 generate a differential pressure across the retrieval apparatus and provide a hydraulic force to effect retrieval of a tool or a bottom hole assembly; and 
 circulate fluid from the casing string into a casing string annulus. 
   
     
     
         15 . The method of  claim 14 , further comprising withdrawing fluid from the casing string annulus. 
     
     
         16 . The method of  claim 14 , further comprising at least one of measuring and controlling the differential pressure. 
     
     
         17 . The method of  claim 16 , wherein controlling the differential pressure includes adjusting a fluid pumping rate from the inlet to the outlet. 
     
     
         18 . The method of  claim 14 , further comprising pulling a wireline coupled to the retrieval apparatus to provide additional upward force to the retrieval apparatus. 
     
     
         19 . The method of  claim 14 , further comprising reciprocating the casing string while performing the wireline retrieval operation. 
     
     
         20 . The method of  claim 14 , further comprising when the retrieval tool is at surface:
 monitoring a pressure of the well;   when static, disconnecting surface pressure control equipment from an upper end portion of the casing string; and   recovering the tool or the bottom hole assembly.