Optimized liner thickness for positive displacement drilling motors

  • US 6,604,921 B1
  • Filed: 01/24/2002
  • Issued: 08/12/2003
  • Est. Priority Date: 01/24/2002
  • Status: Active Grant
First Claim
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1. A stator for a positive displacement motor comprising:

  • an external tube comprising an outer surface and an inner surface, the inner surface comprising at least two radially inwardly projecting lobes extending helically along a selected length of the external tube; and

    a liner disposed proximate the inner surface, the liner conforming to the radially inwardly projecting lobes formed on the inner surface and to the helical shape of the inner surface, wherein a thickness of the liner is at a maximum proximate the at least two radially inwardly projecting lobes.

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