POSITIVE DISPLACEMENT DOWNHOLE MOTOR Russian patent published in 1995 - IPC

FIELD: well drilling. SUBSTANCE: positive displacement downhole motor has cylindrical body. Fastened inside body without gap are shaped stators in form of half-bushings and cross partitions with channels. Channels successively communicate working chambers. Made in lower corner part of inlet edge of each half-bushings outlet channel in form of cutout combined with partition channel. Located inside body is rotor with through recesses located in same axial plane. Arranged in recesses are blades for radial displacement. Blades are made in form of halves and spring-loaded in radial direction. Installed between blade halves is shim. Stator half-bushings are turned relative to one another through 180 deg. EFFECT: higher efficiency. 5 dwg