US2006180312A1PendingUtilityA1

Displacement annular swivel

33
Individually held — no corporate assignee on recordPriority: Feb 11, 2005Filed: Feb 11, 2005Published: Aug 17, 2006
Est. expiryFeb 11, 2025(expired)· nominal 20-yr term from priority
Inventors:Neal BracksieckDavid Hebert
E21B 33/076E21B 33/064E21B 33/038E21B 17/07E21B 17/05
33
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Claims

Abstract

A displacement annular swivel is disclosed consisting of a mandrel with a sleeve assembly positioned around the outside diameter of the mandrel. The sleeve assembly consists of at least one radial bushing such that the mandrel can be rotated and reciprocated within the sleeve assembly when the sleeve assembly is fixed in a stationary position. At least one sealing element is present on the sleeve assembly to radially seal against the outside diameter of the mandrel. A method for displacing drilling mud from a completed subsea wellbore is also disclosed consisting of closing a blowout preventer around the aforementioned tool connected to the work string. The tool thereby allows the work string to be rotated and reciprocated when the blowout preventer is closed. Drilling fluid can then be displaced from the wellbore by pumping a fluid such as completion brine through the work string and out the choke and kill lines.

Claims

exact text as granted — not AI-modified
1 . A method for displacing drilling fluids from a wellbore, comprising: 
 closing a blowout preventer around a tool connected to a work string; and    displacing drilling fluid from the wellbore;    wherein the work string can be rotated and reciprocated during the displacing step.    
   
   
       2 . The method of  claim 1 , wherein the wellbore is a subsea wellbore.  
   
   
       3 . The method of  claim 1 , wherein the blowout preventer is an annular blowout preventer.  
   
   
       4 . The method of  claim 1 , wherein the drilling fluid is displaced by pumping fluid through the work string.  
   
   
       5 . The method of  claim 4 , wherein the fluid is completion brine.  
   
   
       6 . The method of  claim 1 , wherein the drilling fluid is displaced through at least one line connected to the wellbore below the closed blowout preventer.  
   
   
       7 . The method of  claim 6 , wherein the at least one line is selected from the choke line or the kill line.  
   
   
       8 . The method of  claim 1 , wherein the tool comprises: 
 a mandrel, the mandrel having a first length and an outside diameter; and    a sleeve assembly positioned around the outside diameter of the mandrel, the sleeve assembly having a second length that is smaller than the first length.    
   
   
       9 . The method of  claim 8 , wherein the blowout preventer is closed around the sleeve assembly.  
   
   
       10 . The method of  claim 9 , wherein the sleeve assembly is substantially stationary when the blowout preventer is closed.  
   
   
       11 . The method of  claim 8 , wherein the mandrel is rotated within the sleeve assembly when the work string is rotated.  
   
   
       12 . The method of  claim 8 , wherein the mandrel is reciprocated within the sleeve assembly when the work string is reciprocated.  
   
   
       13 . The method of  claim 8 , wherein the sleeve assembly further comprises at least one sealing element that seals radially on the outside diameter of the mandrel.  
   
   
       14 . A displacement annular swivel, comprising: 
 a mandrel, the mandrel having a first length and an outside diameter; and    a sleeve assembly positioned around the outside diameter of the mandrel, the sleeve assembly having a second length that is smaller than the first length;    wherein the mandrel can be rotated within the sleeve assembly when the sleeve assembly is fixed in a stationary position.    
   
   
       15 . The tool of  claim 14 , wherein the sleeve assembly comprises at least one radial bushing.  
   
   
       16 . The tool of  claim 14 , wherein the mandrel can be reciprocated when the sleeve assembly is fixed in a stationary position.  
   
   
       17 . The tool of  claim 14 , wherein the sleeve assembly further comprises at least one sealing element that seals radially on the outside diameter of the mandrel.  
   
   
       18 . The tool of  claim 17 , wherein the at least one sealing element is an o-ring.  
   
   
       19 . The tool of  claim 14 , further comprising an upper sub connected to the top of the mandrel and a lower sub connected to the bottom of the mandrel.  
   
   
       20 . The tool of  claim 14 , wherein the upper sub connects to a string section above the tool and the lower sub connects to a string section below the tool.

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