Abstract
The following are described: the history of turbodrill development, positive displacement motor development, the theory of turbodrills, the theory of positive displacement motors, basic motor components, forces on thrust bearings, thrust bearing design, radial bearing design, rotary seal design, sealed lubrication system, lubricants, and project status. Included in appendices are materials on high-temperature lubricants and a progress report on the design of downhole motor seal, bearing, and lubrication test systems. (MHR)
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