Closed compartment well tool for wellhead re-packing

Abstract

A well tool assembly well tool includes a coupling subassembly and a supporting subassembly coupled to the coupling subassembly. The coupling subassembly is configured to couple to a pressure port positioned on an above-surface portion of a wellhead of a wellbore. The coupling subassembly includes a body configured to sealingly couple to the pressure port on the wellhead. The supporting subassembly includes a first plate and a second plate, each configured to couple to the portion of the wellhead above and below the pressure port, respectively. The supporting subassembly is configured to orient the body between the first plate and the second plate to couple to the pressure port and to support a weight of the coupling subassembly.

1 . A well tool comprising:
 a coupling subassembly configured to couple to a pressure port positioned on an above-surface portion of a wellhead of a wellbore, the coupling subassembly comprising a body configured to sealingly couple to the pressure port on the wellhead; and   a supporting subassembly coupled to the coupling subassembly, the supporting subassembly comprising a first plate and a second plate, each configured to couple to the portion of the wellhead above and below the pressure port, respectively, the supporting subassembly configured to orient the body between the first plate and the second plate to couple to the pressure port and to support a weight of the coupling subassembly.   
     
     
         2 . The well tool of  claim 1 , wherein the body comprises a first hollow cylindrical portion, wherein the body comprises a second hollow cylindrical portion concentrically positioned within the first hollow cylindrical portion, the first hollow cylindrical portion configured to rotate independently of the second hollow cylindrical portion, the second hollow cylindrical portion configured to translate with the first hollow cylindrical portion. 
     
     
         3 . The well tool of  claim 2 , wherein an inner surface of the first hollow cylindrical portion defines a first shoulder, wherein an outer surface of the second hollow cylindrical portion defines a second shoulder, wherein the first shoulder and the second shoulder are configured to abut to limit a translation of the second hollow cylindrical portion within the first hollow cylindrical portion. 
     
     
         4 . The well tool of  claim 2 , wherein the body comprises a piston stem positioned within the second hollow cylindrical portion, the piston stem configured to slide within the second hollow cylindrical portion towards and away from a plug that covers the pressure port. 
     
     
         5 . The well tool of  claim 4 , wherein the second hollow cylindrical portion comprises a locking gland nut configured to threadedly couple to the second hollow cylindrical portion and to retain the piston stem within the second hollow cylindrical portion. 
     
     
         6 . The well tool of  claim 4 , wherein the body comprises a retrieving socket head attached to the piston stem, the retrieving socket head configured to mate with the plug. 
     
     
         7 . The well tool of  claim 2 , wherein the body comprises a locking ring attached to a proximal end of the second hollow cylindrical portion relative to the pressure port. 
     
     
         8 . The well tool of  claim 7 , wherein the body comprises a compression ring attached to the locking ring and configured to be positioned between the locking ring and the pressure port, the compression ring configured to seal to an outer surface of the portion of the wellhead at which the pressure port is positioned. 
     
     
         9 . The well tool of  claim 8 , wherein the compression ring defines an O-ring groove, and wherein the compression ring further comprises an O-ring positioned in the O-ring groove, the O-ring configured to seal the compression ring to the outer surface of the portion of the wellhead at which the pressure port is positioned. 
     
     
         10 . The well tool of  claim 2 , wherein the second hollow cylindrical portion comprises an autoclave fitting configured to couple to a pressure gauge configured to sense a pressure within the second hollow cylindrical portion. 
     
     
         11 . The well tool of  claim 2 , wherein the first hollow cylindrical portion comprises threads formed on an outer surface of the first hollow cylindrical portion, wherein the supporting subassembly comprises a third plate positioned between and perpendicular to the first plate and the second plate, the third plate defining an opening in which the threads of the first hollow cylindrical portion are received. 
     
     
         12 . The well tool of  claim 11 , wherein the supporting subassembly comprises a first support bar and a second support bar, wherein the third plate is attached to the first support bar and the second support bar. 
     
     
         13 . The well tool of  claim 12 , wherein each of the first support bar and the second support bar defines a respective guide to which the third plate is attached, wherein each respective guide is configured to allow adjusting a position of the third plate between the first plate and the second plate. 
     
     
         14 . The well tool of  claim 1 , wherein the first plate defines a plurality of first openings through which the first plate is attached to the wellhead. 
     
     
         15 . The well tool of  claim 14 , wherein the second plate defines a plurality of second openings through which the second plate is attached to the wellhead. 
     
     
         16 . The well tool of  claim 15 , wherein the plurality of first openings and the plurality of second openings are configured to receive respective rods configured to be bolted to the wellhead. 
     
     
         17 . A method comprising:
 coupling a first plate and a second plate of a supporting subassembly of a well tool to an above-surface portion of a wellhead of a wellbore, a coupling subassembly coupled to the supporting subassembly and positioned between the first plate and the second plate; and   coupling the coupling subassembly to a pressure port positioned on the above-surface portion of a wellhead of a wellbore to form a seal between a body of the coupling subassembly and the pressure port on the wellhead, the pressure port positioned at a location on the portion of the wellhead between the first plate and the second plate, the seal sufficient to prevent a pressure within the wellbore from being released to the atmosphere through the pressure port.   
     
     
         18 . The method of  claim 17 , wherein the body of the coupling subassembly comprises:
 a first hollow cylindrical portion; and   a second hollow cylindrical portion concentrically positioned within the first hollow cylindrical portion,   wherein coupling the coupling subassembly to the pressure port comprises, after coupling the first plate and the second plate of the supporting subassembly to the portion of the wellhead, rotating the first hollow cylindrical portion between the first plate and the second plate, wherein, in response to rotating the first hollow cylindrical portion, the second hollow cylindrical portion non-rotationally translates within the first hollow cylindrical portion towards the pressure port.   
     
     
         19 . The method of  claim 18 , wherein coupling the coupling subassembly to the pressure port comprises sliding a piston stem positioned within the second hollow cylindrical portion towards a plug that covers the pressure port. 
     
     
         20 . The method of  claim 19 , wherein coupling the coupling subassembly to the pressure port comprises positioning a retrieving socket head attached to a proximal end of the piston stem relative to the plug, over the plug.