Torsional Restraints For Downhole Transmissions

Abstract

A noninvasive method for the affixing of a transmission in a downhole housing wherein the housing is deformed, creating an oval cross section, and inserting the transmission into the housing with the greatest cross section of the transmission being positioned along the major axis of the oval created and, thereafter, releasing pressure to cause said housing to return to its normal circular cross section.

1 . In a well for the production of subsurface fluids wherein a cylindrical housing, said housing having an interior wall surface and an exterior wall surface, extends from a power source at the surface to a pump immersed in the subsurface fluid;
 a method of affixing a transmission within the housing, comprising the steps of:   applying pressure to compress said housing so as to distort its cross section to an oval configuration;   positioning said transmission within said housing at a predetermined level;   releasing pressure on said housing so as to permit its return to its circular inside diameter whereby said internal diameter of said housing frictionally engaged with at least a portion of said transmission firmly holding the same in its predetermined position.   
     
     
         2 . In a well for the production of subsurface fluids wherein a cylindrical housing, said housing having an interior wall surface and an exterior wall surface, extends from a power source at the surface to a pump immersed in the subsurface fluid;
 a method of affixing a transmission within the housing, comprising the steps of:   applying pressure to compress said housing so as to distort its cross section to an oval configuration;   roughening the surface of the interior diameter of said housing;   positioning said transmission within said housing at a predetermined level;   releasing pressure on said housing so as to permit its return to its circular inside diameter whereby said internal diameter of said housing frictionally engaged with at least a portion of said transmission firmly holding the same in its predetermined position.   
     
     
         3 . The method of  claim 1 , comprising the step of introducing hydraulic jacks 180 degrees apart against the exterior surface of said housing and using said jacks to distort said housing. 
     
     
         4 . The method of  claim 1 , wherein spacers are provided intermittently throughout said transmission. 
     
     
         5 . The method of  claim 2 , wherein said hydraulic jacks providing a uniform radial pressure to said housing. 
     
     
         6 . The method of  claim 1 , wherein said interior wall of said housing being textured. 
     
     
         7 . The method of  claim 2 , wherein said interior wall of said housing being knurled. 
     
     
         8 . The method of  claim 1 , wherein said interior wall being knurled. 
     
     
         9 . The method of  claim 2 , wherein said interior wall of said housing being textured.