Tubing head with installable shoulder

Abstract

Tubing heads are described herein. A tubing head includes a tubing head body and an installable shoulder. The tubing head body defines a bore extending longitudinally between a first end and a second end. The bore defines a cavity portion disposed longitudinally between a first portion of the bore and a second portion of the bore. The cavity portion has a cavity diameter greater than a first diameter of the first portion of the bore. The installable shoulder includes a plurality of shoulder segments configured to be installed within the cavity portion and collectively form an annular ring. The annular ring defines a bearing surface configured to support a wellhead component. The annular ring further defines a shoulder diameter less than the cavity diameter and greater than the first diameter of the first portion of the bore.

What is claimed is: 
     
         1 . A tubing head comprising:
 a tubing head body defining a bore extending longitudinally between a first end and a second end, the bore defining a cavity portion disposed longitudinally between a first portion of the bore and a second portion of the bore, wherein the cavity portion has a cavity diameter greater than a first diameter of the first portion of the bore; and   an installable shoulder comprising a plurality of shoulder segments configured to be installed within the cavity portion and collectively form an annular ring, wherein the annular ring defines a bearing surface configured to support a wellhead component and the annular ring further defines a shoulder diameter less than the cavity diameter and greater than the first diameter of the first portion of the bore.   
     
     
         2 . The tubing head of  claim 1 , wherein the cavity diameter is greater than a second diameter of the second portion of the bore. 
     
     
         3 . The tubing head of  claim 1 , wherein the tubing head comprises an upper flange disposed at the first end and a lower flange disposed at the second end. 
     
     
         4 . The tubing head of  claim 1 , wherein the first diameter of the first portion of the bore is greater than 6½ inches. 
     
     
         5 . The tubing head of  claim 4 , wherein a second diameter of the second portion of the bore is greater than 6½ inches. 
     
     
         6 . The tubing head of  claim 1 , wherein the first diameter of the first portion of the bore is configured to permit a casing isolation plug to pass therethrough. 
     
     
         7 . The tubing head of  claim 6 , wherein a second diameter of the second portion of the bore is configured to permit the casing isolation plug to pass therethrough. 
     
     
         8 . The tubing head of  claim 1 , wherein the first diameter of the first portion of the bore is drift compatible with 7⅝ inch casing. 
     
     
         9 . The tubing head of  claim 1 , wherein each shoulder segment of the plurality of shoulder segments is less than or equal to a 180 degree segment of the annular ring. 
     
     
         10 . The tubing head of  claim 1 , wherein the tubing head body is formed from a first material and the installable shoulder is formed from a second material that is different than the first material. 
     
     
         11 . The tubing head of  claim 10 , wherein the second material has a tensile strength greater than the first material. 
     
     
         12 . The tubing head of  claim 10 , wherein the second material has a tensile strength of at least approximately 120 kilopounds per square inch. 
     
     
         13 . The tubing head of  claim 1 , wherein the bearing surface of the annular ring is angled relative to the bore. 
     
     
         14 . A method to isolate a wellbore, the method comprising:
 introducing a casing isolation plug into the wellbore through a wellhead housing;   introducing a shoulder into the tubing head;   coupling a tubing head to the wellhead housing; and   retrieving the casing isolation plug through a bore of the tubing head and an inner diameter of the shoulder.   
     
     
         15 . The method of  claim 14 , further comprising:
 introducing a wellhead component through the bore of the tubing head; and   supporting the wellhead component relative to the tubing head via the shoulder.   
     
     
         16 . The method of  claim 14 , wherein the tubing head is formed from a first material and the shoulder is formed from a second material that is different than the first material. 
     
     
         17 . The method of  claim 14 , wherein introducing the shoulder into the tubing head comprises introducing a plurality of shoulder segments into the tubing head to collectively form an annular ring within the tubing head. 
     
     
         18 . A wellhead system comprising:
 a wellhead housing;   a tubing head coupled to the wellhead housing, the tubing head comprising:   a tubing head body defining a bore in fluid communication with the wellhead housing and extending longitudinally between a first end and a second end; and   an installable shoulder disposed within the bore; and   a wellhead component disposed within the bore of the tubing head and supported by the installable shoulder.   
     
     
         19 . The wellhead system of  claim 18 , wherein the tubing head body is formed from a first material and the installable shoulder is formed from a second material that is different than the first material. 
     
     
         20 . The wellhead system of  claim 18 , wherein the installable shoulder comprises a plurality of shoulder segments.