System, Method, and Apparatus for Centralizing a Downhole Casing and Connecting Portions Thereof

Abstract

Embodiments of the present invention may comprise a downhole casing system. A coupling may have a first end, a second end, an inner surface, and an outer surface. One or more blades may be configured on the outer surface of the coupling. The one or more blades may extend substantially from the first end to the second end. The one or more blades may extend in a helical pattern. A first casing portion may thread into or onto the first end of the coupling. A second casing portion may thread into or onto the second end of the coupling to form a connected casing. The connected casing may be inserted into a borehole, whereby the one or more blades of the coupling centralize the connected casing within the borehole.

1 . A downhole casing system comprising:
 a first casing portion;   a second casing portion;   a coupling comprising:
 an inner surface; 
 an outer surface; 
 a first end; 
 a second end; 
 one or more blades configured on the outer surface and extending substantially from the first end to the second end; and 
   a borehole;   wherein the first casing portion and second casing portion are connected by the coupling to form a connected casing,   wherein the connected casing is inserted into a borehole,   wherein the one or more blades of the coupling centralize the connected casing within the borehole.   
     
     
         2 . The system of  claim 1 ,
 wherein the first casing portion is connected to the coupling at the first end by internal threads configured on the inner surface of the coupling,   wherein the second casing portion is connected to the coupling at the second end by internal threads configured on the inner surface of the coupling.   
     
     
         3 . The system of  claim 1 ,
 wherein the first casing portion is connected to the coupling at the first end by external threads configured on the outer surface of the coupling,   wherein the second casing portion is connected to the coupling at the second end by internal threads configured on the inner surface of the coupling.   
     
     
         4 . The system of  claim 1 ,
 wherein the first casing portion is connected to the coupling at the first end by external threads configured on the outer surface of the coupling,   wherein the second casing portion is connected to the coupling at the second end by external threads configured on the outer surface of the coupling.   
     
     
         5 . The system of  claim 1 , wherein the one or more blades extend substantially from the first end of the coupling to the second end of the coupling in a helical pattern. 
     
     
         6 . The system of  claim 1 , wherein the one or more blades are integrally formed with the outer surface of the coupling. 
     
     
         7 . The system of  claim 1 , wherein the coupling further comprises a shoulder ring configured on the inner surface of the coupling,
 wherein the first casing portion and the second casing portion are separated by the shoulder ring when the first casing portion and the second casing portion are connected by the coupling.   
     
     
         8 . The system of  claim 1 , wherein the shoulder ring increases the torque that is applied when connecting the first casing portion and the second casing portion to the coupling. 
     
     
         9 . A coupling comprising:
 an inner surface;   an outer surface;   a first end;   a second end; and   one or more blades configured on the outer surface and extending substantially from the first end to the second end,   wherein the coupling connects two portions of downhole casing to form a connected casing,   wherein the connected casing is inserted into a borehole,   wherein the one or more blades of the coupling centralize the connected casing in the borehole.   
     
     
         10 . The coupling of  claim 9 , further comprising a shoulder ring configured on the inner surface between the first end and the second end. 
     
     
         11 . The coupling of  claim 9 , further comprising:
 internal threads configured on the inner surface and extending from the first end towards the shoulder ring; and   internal threads configured on the inner surface and extending from the second end towards the shoulder ring,   wherein the two portions of the downhole casing are threaded into the coupling at the first end and second end, respectively.   
     
     
         12 . The coupling of  claim 9 , further comprising:
 internal threads configured on the inner surface and extending from the first end towards the shoulder ring; and   external threads configured on the outer surface and extending from the second end away from the shoulder ring,   wherein the two portions of the downhole casing are threaded into the coupling at the first end and onto the coupling at the second end, respectively.   
     
     
         13 . The coupling of  claim 9 , further comprising:
 external threads configured on the outer surface and extending from the first end away from the shoulder ring; and   external threads configured on the outer surface and extending from the second end away from the shoulder ring,   wherein the two portions of the downhole casing are threaded onto the coupling at the first end and the second end, respectively.   
     
     
         14 . The coupling of  claim 9 , further comprising:
 internal threads configured on the inner surface and extending from the first end towards the shoulder ring;   internal threads configured on the inner surface and extending from the second end towards the shoulder ring;   external threads configured on the outer surface and extending from the first end away from the shoulder ring; and   external threads configured on the outer surface and extending from the second end away from the shoulder ring,   wherein the two portions of the downhole casing are connected to the coupling at the first end and the second end, respectively.   
     
     
         15 . The coupling of  claim 9 , wherein the one or more blades extend substantially from the first end to the second end in a helical pattern. 
     
     
         16 . The coupling of  claim 9 , wherein the one or more blades are integrally formed with the outer surface. 
     
     
         17 . A method for running a casing downhole, comprising:
 providing a borehole;   providing a first casing portion;   providing a second casing portion;   providing a coupling comprising:
 an inner surface; 
 an outer surface; 
 a first end; 
 a second end; 
 one or more blades configured on the outer surface and extending substantially from the first end to the second end; 
   forming a connected casing by:
 connecting the first casing portion to the first end of the coupling; 
 connecting the second casing portion to the second end of the coupling; 
   inserting the connected casing into the borehole; and   centralizing the connected casing within the borehole with the one or more blades of the coupling.   
     
     
         18 . The method of  claim 17 , wherein the first casing portion is connected to the first end of the coupling by threading the first casing portion into internal threads configured on the inner surface of the coupling. 
     
     
         19 . The method of  claim 17 , wherein the first casing portion is connected to the first end of the coupling by threading the first casing portion onto external threads configured on the outer surface of the coupling. 
     
     
         20 . The method of  claim 17 , further comprising:
 moving drilling fluid through the borehole,
 whereby some of the drilling fluid moves through the borehole outside of the casing, 
   wherein the motion of the some of the drilling fluid outside of the casing is aided by the one or more blades of the coupling.