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Bottom hole assembly for directional drilling

  • US 5,857,531 A
  • Filed: 04/18/1997
  • Issued: 01/12/1999
  • Est. Priority Date: 04/10/1997
  • Status: Expired due to Term
First Claim
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1. A bottom hole assembly for connection to a drill string for drilling directional wells at build-up rates between 20 and 70 degrees per hundred feet, comprising:

  • a drill bit operatively connected to a positive displacement drilling motor;

    said motor having tubular housings including a power generation housing;

    one of said housings having a bend downhole of said power generation housing for the purpose of deflecting said drill bit away from the axis of the drill string; and

    a flexible section between said power generation housing and said bend for purposes of reducing side loads on said drill bit and increasing build-up rate capability of the bottom hole assembly.

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