Tubing Installation Assembly

Abstract

Liner hanger running tool assemblies that may function as a treating string after the liner is set are disclosed. Such assemblies may have a stomp tool that with variable positions so that the stomp tool may be positioned optimally for run-in and them may be moved to a second position that is more optimal during treatment operations. The stomp tool may also serve as a locating device during high pressure treatment to permit full insertion of the seal assembly without impacting the liner hanger assembly with the bottom of the running tool.

We claim: 
     
         1 . A downhole tool for installing a tubing string into a well or wellbore, the downhole tool having a run-in state and a treating state and comprising:
 a mandrel   a top sub and a seal sub fixed to the mandrel;   a stomp sub slidingly engaging the mandrel;   
       wherein,
 the stomp sub is adjacent to the seal sub in the setting state and distal to the seal sub in the treating state; and 
 the stomp sub is adjacent to the top sub in the treating state. 
 
     
     
         2 . The downhole tool of  claim 1  further comprising a shear element fixing the stomp sub along the mandrel in the run-in state, wherein the stomp sub is released from the shear element in the treating state. 
     
     
         3 . The downhole tool of  claim 2  wherein the shear element is at least one shear pin. 
     
     
         4 . The downhole tool of  claim 1  further comprising a running nut releasably connected to the top of liner assembly, wherein the downhole tool is locked in the run-in state until the running nut is released from the liner assembly. 
     
     
         5 . The downhole tool of  claim 1  wherein the running nut is releasably connected to a liner top packer. 
     
     
         6 . The downhole tool of  claim 1  wherein the stomp sub is a dog sub comprising a plurality of radially expandable dogs. 
     
     
         7 . The downhole tool of  claim 5  wherein the stomp sub is configured to prevent the running nut from contacting the liner top packer when the downhole tool is in the treating state. 
     
     
         8 . The downhole tool of  claim 1  wherein the top sub is fixed to the stomp sub in the treating state. 
     
     
         9 . A landed seal assembly for sealing the interior of a polished bore receptacle connected above a liner top packer, the landed seal assembly having a run-in state and a treating state and comprising:
 a locater sub;   a seal sub; and   a top sub;   a mandrel   
       wherein,
 the top sub and the seal sub are fixed to the mandrel; 
 the locater sub is inside the polished bore receptacle in the run-in state and 
 above the polished bore receptacle in the set state; 
 the mandrel extends between the top sub and the seal sub; 
 the mandrel substantially extends between the top sub and the locater sub in the run-in position and between the locater sub and the seal sub in the treating position. 
 
     
     
         10 . The landed seal assembly of  claim 9  wherein the locater sub is a stomp sub. 
     
     
         11 . The landed seal assembly of  claim 9  where the locater sub is a dog sub with a plurality of expandable dogs arranged around the outer circumference of the dog sub, the plurality of dogs retracted in the run-in state and expanded in the treating state. 
     
     
         12 . The landed seal assembly of  claim 9  wherein the locater sub slidingly engages the mandrel, is fixed to the mandrel in the run-in state and is fixed to the top sub in the treating state. 
     
     
         13 . The landed seal assembly of  claim 9  further comprising a running nut connected to the liner top packer in the run in state. 
     
     
         14 . The landed seal assembly of  claim 13  wherein the connection of the running nut to the liner top packer prevents transition of the landed seal assembly from the run in state to the treating state. 
     
     
         15 . The landed seal assembly of  claim 9  wherein the seal sub comprises a plurality of chevron seals. 
     
     
         16 . A method for treating a subterranean formation penetrated by a well, the well comprising a casing string installed along an upper portion of the wellbore, the method comprising:
 running a tubing string into the wellbore, the tubing string having a continuous through bore and comprising:
 a liner, a liner hanger connected above the liner, a liner top packer, a tubing length connected above the liner top packer, and a running string having a running tool, the running tool comprising:
 a mandrel; 
 a stomp sub positioned at least partially inside the tubing length and slidingly engaging the mandrel; 
 a top sub; and 
 a seal sub sealingly engaged with the tubing length; 
 
 engaging the liner hanger with the casing; 
 removing the stomp sub from inside the tubing length and engaging a portion of the stomp sub on an end of the tubing length; 
 moving the top sub toward the stomp sub; 
 moving the seal sub away from the stomp sub; 
 setting the liner top packer with downward force from the running string applied to the stomp sub through the top sub; 
 removing the running tool from the tubing length; 
 reinserting the running tool into the tubing length and sealing the interior of the tubing length with the seal sub; 
 treating the formation through the running tool, tubing length, liner top packer, liner hanger, and liner. 
   
     
     
         17 . The method of  claim 16  wherein the running tool is connected to the liner top packer, the method comprising releasing the running tool from the liner top packer prior to removing the stomp sub from inside the tubing length. 
     
     
         18 . The method of  claim 17  further comprising flowing cement through the running string and liner and placing the cement around the liner in the wellbore and into the casing adjacent to the liner top packer. 
     
     
         19 . The method of  claim 18  further comprising running a wiper dart through the running tool, out of the running nut, and into the liner top packer. 
     
     
         20 . The method of  claim 16  wherein the top sub and the seal sub are fixed along the length of the running tool and moving the seal sub away from the stomp sub happens contemporaneously with moving the top sub toward the stomp sub.