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US 4,011,917 AGranted
Process and universal downhole motor for driving a tool
OwnerWladimir Tiraspolsky, Roger Francois Rouviereinventors
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OwnerWladimir Tiraspolsky, Roger Francois Rouviereinventors
Estimating the term…
The process enables, while starting from the same basical members, assembled in two different arrangements, to drive an earth-boring tool such as a bit, a milling cutter, a core barrel or the like with a reduced speed or a fast speed, according to the prevailing boring conditions. The downhole motor comprises a shaft and a body constituted by two helicoidal gears arranged within each other, providing an encapsulation preferably of right-handed pitch and having K and K+1 teeth. For providing a reduced speed the body is rotatably mounted and the tool is connected to said body. The shaft is angularly fixed and free to undergo a nutation movement. The resulting speed is the relative speed of rotation between the said body and the said shaft. For providing a fast rotation speed, the body is angularly and radially fixed. The helicoidal shaft meshes with the body and is supported in order freely to rotate around a crank system. The tool is connected to the crank.
Downhole motor for driving an earth-boring tool, supported from a drill stem and comprising a helicoidal shaft and a tubular body having a helicoidal lining, said shaft and body comprising two helicoidal gears located within each other, comprising K and K+1 teeth respectively, arranged for creating an encapsulation of a given pitch direction, said shaft being located within said tubular body, means for mounting said shaft in order that it is angularly fixed, but free to undergo a nutating movement, a casing rigidly secured to said drill stem, upper and lower radial bearing means and thrust bearing means for rotatively mounting said body within said casing, means for connecting said tool with said rotating body, and means for supplying a driving fluid between said shaft and said tubular body.
Downhole motor adapted for connection to a tubular conduit for driving an earth boring tool comprising:
Dependencies are inferred from the claim text.