E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 4/02 (2006.01) B29C 45/00 (2006.01) C07C 255/08 (2006.01) F03C 2/08 (2006.01) F04C 2/107 (2006.01)
Patent
CA 2417565
The down hole drilling motor, eg of the progressing cavity or Moineau type, comprising a tubular housing, eg of steel, enclosing a lobed stator of nitrile rubber which defines a cavity within which a lobed rotor is caused to be rotate by applying fluid pressure to the cavity. The stator may be formed from a compound comprising nitrile rubber having about 35% by weight acyrlonitrile, a Mooney viscosity of about 50 (35-5 NBR) and a hardness of less than 90 Shore A. Various other structural properties of the compound including tensile strength, elongation at break, tear strength, tensile modulus, compression modulus, E', E" and tan s are specified. The stator compound has improved manufacturing and performance characteristics.
Halliburton Energy Services Inc.
Kirby Eades Gale Baker
LandOfFree
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