Down hole drilling motor with lobed stator of nitrile rubber
The down hole drilling motor, eg of the progressing cavity or Moineau type, comprising a tubular housing 12, eg of steel, enclosing a lobed stator 20 of nitrile rubber which defines a cavity 34 within which a lobed rotor 22 is caused to rotate by applying fluid pressure to the cavity 34. The stator...
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Main Author | |
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Format | Patent |
Language | English |
Published |
24.09.2003
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | The down hole drilling motor, eg of the progressing cavity or Moineau type, comprising a tubular housing 12, eg of steel, enclosing a lobed stator 20 of nitrile rubber which defines a cavity 34 within which a lobed rotor 22 is caused to rotate by applying fluid pressure to the cavity 34. The stator 20 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. |
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Bibliography: | Application Number: GB20030001605 |