Stator for down hole drilling motor
AssigneeHalliburton Energy Services, Inc.
InventorLillian Guo
Life of this patent
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Abstract
An improved down hole drilling motor suitable for drilling applications. The down hole drilling motor comprising a stator disposed in the tubular housing. The stator includes an internal cavity having one or more lobes. A rotor operatively positioned in the cavity of the stator is adapted to cooperate with the one or more lobes of the stator. The stator comprising a compound having improved manufacturing and performance characteristics.
Claims20
A down hole drilling motor for well drilling operations including:
- a tubular housing;
- a stator disposed in the tubular housing, said stator having an internal cavity passing therethrough, wherein the stator includes one or more lobes defining at least a portion of the cavity;
- a rotor operatively positioned in the cavity to cooperate with the one or more lobes of the stator;
- and
- wherein the improvement comprises the one or more lobes being formed from a compound comprising nitrile rubber having about 35% by weight acrylonitrile and a Mooney viscosity of about 50% (35-5 NBR).
A stator for use in a down hole drilling motor for use in well drilling operations including a tubular housing, wherein the stator comprises one or more lobes defining at least a portion of a cavity adapted to receive a rotor and wherein the improvement comprises the stator being formed from a compound comprising nitrile rubber having about 35% by weight acrylonitrile and a Mooney viscosity of about 50 (35-5 NBR).
A down hole drilling motor for use in well drilling applications, the motor including:
- a tubular housing;
- and
- a stator disposed in the housing, said stator having an internal cavity;
- a rotor disposed in said cavity in said stator;
- wherein the improvement comprises the stator being formed from a compound having structural properties of:
- a tensile strength of about 2300 psi;
- an elongation at break of about 350%;
- a tear strength of about 195 lb/in;
- a 25% tensile modulus of about 230 psi;
- a 50% tensile modulus of about 330 psi;
- a 100% tensile modulus of about 620 psi;
- and
- a hardness of about 75 Shore A.
A down hole drilling motor for use in oil and gas well drilling applications, the motor comprising:
- a tubular housing;
- a stator disposed in the housing, said stator having an internal cavity therein;
- a rotor disposed in said internal cavity of said stator;
- wherein the improvement comprises the stator being formed from an improved compound having dynamic structural properties of:
- an E′ at 60° C. of about 12.3;
- an E″ at 60° C. of about 2.5;
- and
- a tan δ at 60° C. of about 0.20.
A down hole drilling motor for use in fluid drilling applications, the motor comprising:
- a tubular housing;
- and
- a stator disposed in the housing, an internal cavity being in said stator;
- a rotor disposed in said cavity in said stator;
- wherein the improvement comprises a stator being formed from an improved compound of:
- nitrile rubber having about 35% by weight acrylonitrile and a Mooney viscosity of about 50;
- wherein the compound has a hardness measurement less than 90 Shore A.
A method of manufacturing a down hole motor, the method comprising:
- injection-molding a stator into a tubular housing, having an internal cavity, with one or more lobes defining said cavity, said stator being formed from a compound;
- wherein the improvement comprises forming the compound from a nitrile rubber having about 35% by weight acrylonitrile and the compound has a hardness measurement less than 90 Shore A.
A method of operating a down hole drilling motor in a well drilling application, the method comprising:
- loading a rotor positioned in an internal cavity in a stator, wherein said cavity has one or more lobes therein;
- allowing lobes of the stator to deform;
- maintaining a predetermined clearance between the lobes of the stator and the rotor, wherein the lobes of the stator are formed from a compound comprising nitrile rubber having about 35% by weight acrylonitrile and the compound has a hardness measurement of less than 90 Shore A.
A method of improving down hole drilling motor performance characteristics, the method comprising:
- providing a tubular housing for said down hole motor, and
- injection-molding a stator formed from an improved rubber compound into the housing, wherein the improved compound comprises nitrile rubber having about 35% by weight acrylonitrile and the compound has a hardness measurement less than about 90 Shore A.
A method of operating a down hole drilling motor in a well drilling operation, the method including the steps of:
- introducing a drilling fluid into a first end of a down hole drilling motor;
- loading a rotor positioned in a stator by passing drilling fluid introduced at the first end of said motor through a cavity between one or more lobes of a stator formed from an improved compound;
- allowing the stator to deform;
- wherein the improvement comprises forming the stator from an improved compound of nitrile rubber having about 35% by weight acrylonitrile and a hardness measurement less than about 90 Shore A.
Dependencies are inferred from the claim text.