US2007181297A1PendingUtilityA1

Downhole well pump with bottom standoff

34
Individually held — no corporate assignee on recordPriority: Feb 7, 2006Filed: Feb 6, 2007Published: Aug 9, 2007
Est. expiryFeb 7, 2026(expired)· nominal 20-yr term from priority
Inventors:Charles W. Mcanally
E21B 43/126E21B 17/00
34
PatentIndex Score
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References
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Claims

Abstract

In a downhole well pumping system an elongated bottom standoff pipe member is connected at one end to the lower end of a well pump and includes a plug disposed at the opposite end of the standoff pipe. The standoff pipe member is adapted to rest on the wellbore bottom wall to relieve at least some of the tensile forces acting on and otherwise causing elastic stretching of the tubing string of the pumping system. The bottom standoff pipe member is preferably a smooth walled cylindrical member with fluid inlet ports and a gas relief port formed therein, respectively.

Claims

exact text as granted — not AI-modified
1 . In a downhole well pump system, the improvement comprising: 
 a reciprocating piston pump connected to a tubing string and disposed in a wellbore, said pump including an elongated cylinder member; and    an elongated standoff member connected to said cylinder member and adapted to engage a bottom wall of said wellbore for transferring at least a portion of the weight of said tubing string and pump to said wellbore bottom wall to reduce elastic stretching of said tubing string.    
   
   
       2 . The system set forth in  claim 1  wherein: 
 said standoff member comprises a cylindrical tube or pipe.    
   
   
       3 . The system set forth in  claim 2  wherein: 
 said standoff member includes a plug connected to a distal end thereof.    
   
   
       4 . The system set forth in  claim 2  wherein: 
 said standoff member includes at least one opening formed therein for admitting fluids from a wellbore space into a chamber defined by said standoff member.    
   
   
       5 . The system set forth in  claim 2  wherein: 
 said standoff member includes a gas relief port formed therein and providing an opening between said wellbore space and said chamber within said standoff member.    
   
   
       6 . The system set forth in  claim 1  wherein: 
 said standoff member is of a length of between about 20 feet and 500 feet.    
   
   
       7 . In a downhole well pump system, the improvement comprising: 
 a reciprocating piston pump connected to a tubing string and disposed in a wellbore, said pump including an elongated cylinder member; and    an elongated standoff pipe member connected to and extending below said pump, said standoff member including a plug connected to a distal end thereof for engagement with a well bottom wall.    
   
   
       8 . The system set forth in  claim 7  wherein: 
 said standoff member includes at least one opening formed therein for admitting fluids from a wellbore space into a chamber defined by said standoff member.    
   
   
       9 . The system set forth in  claim 8  wherein: 
 said standoff member includes a gas relief port formed therein and providing an opening between said wellbore space and said chamber.    
   
   
       10 . The system set forth in  claim 7  wherein: 
 said standoff member is of a length of between about 20 feet and 500 feet.

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