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Downhole flexible drive system

  • US 4,227,584 A
  • Filed: 12/19/1978
  • Issued: 10/14/1980
  • Est. Priority Date: 12/19/1978
  • Status: Expired due to Term
First Claim
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1. A downhole flexible drive system which attaches to the downhole end of a drill pipe string and operates a drill bit for the drilling of a curved hole in earth formations and drilling fluids can be pumped through the downhole flexible drive system and the downhole flexible drive system comprises:

  • an assembly of motors comprising a plurality of double shaft downhole motors assembled in line a three hundred and sixty degree flexible connection connects the respective ends of said double shafts of said motors forming a flexible joint between said motors, a three hundred and sixty degree flexible assembly constructed to said motors and encloses said flexible connection forming a flex point in said drive system and supports the structure of said drive system and providing a means for drilling fluids to be pumped through said system, an uphole tool joint attached to the uphole end of said system so said drive system can be attached to said drill pipe string and receive drilling fluids from said drill pipe string, a downhole tool joint, a connecting mechanism for connecting said downhole tool joint to the downhole end of said drive system so said drive system can be attached to said drill bit and said motors can operate said drill bit, a plurality of centralizers, a centralizer attached around said system on the uphole side and downhole side of each said flexible connection near said flexible connection.

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