Borehole drilling motor with flexible shaft coupling
First Claim
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1. A downhole drilling motor, comprising:
- a housing,a stator secured within said housing and having a helically contoured internal surface.a rotor disposed within said stator and having a helically contoured external surface, said rotor including a first tempered polygonal socket;
a drive shaft rotatably mounted within housing, said drive shaft including a polygonal socket;
a flexible shaft for connecting said drive shaft to said rotor and allowing eccentric movement of said rotor within said stator, said flexible shaft having first and second polygonal ends;
wherein said first polygonal end of said flexible shaft is received within the polygonal socket of said rotor and said second polygonal end of said flexible shaft is received with said polygonal socket on said drive shaft.
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Abstract
A downhole drilling motor includes a rotor and stator of the Moineau positive displacement type within a housing. A drive shaft is rotatably mounted within the housing. A flexible shaft with a polygonal connection at each end transmits the rotational motion of the rotor to the drive shaft while compensating for the eccentric movement of said rotor within said stator relative to said drive shaft.
75 Citations
18 Claims
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1. A downhole drilling motor, comprising:
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a housing, a stator secured within said housing and having a helically contoured internal surface. a rotor disposed within said stator and having a helically contoured external surface, said rotor including a first tempered polygonal socket; a drive shaft rotatably mounted within housing, said drive shaft including a polygonal socket; a flexible shaft for connecting said drive shaft to said rotor and allowing eccentric movement of said rotor within said stator, said flexible shaft having first and second polygonal ends; wherein said first polygonal end of said flexible shaft is received within the polygonal socket of said rotor and said second polygonal end of said flexible shaft is received with said polygonal socket on said drive shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A downhole drilling motor for directional drilling, comprising:
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a housing, said housing having a first tubular portion extending along a first longitudinal axis, a second tubular portion extending along a second longitudinal axis and a transitional portion between the first and second tubular portions, said first and second longitudinal axes being noncolinear and intersecting in said transitional portion; a stator secured within the first portion of the housing and having a helically contoured inner surface; a rotor disposed within the stator and having a helically contoured external surface; a drive shaft rotatably mounted within the second portion of the housing; a flexible shaft for connecting the drive shaft to the rotor and allowing eccentric movement of the rotor within the stator; and wherein the rotor defines an internal bore extending from an open downhole end of the rotor to a closed uphole end of the rotor, said flexible shaft being received within the internal bore and secured to the closed uphole end of the rotor. - View Dependent Claims (17, 18)
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Specification