MOUNTING DEVICE FOR ORIENTED ASSEMBLY OF WORKING MEMBERS OF SCREW-TYPE DOWNHOLE ENGINE, METHOD OF TUNING THE ENGINE AND ASSEMBLY METHOD

摘要

PCT No. PCT/SU85/00051 Sec. 371 Date Mar. 17, 1986 Sec. 102(e) Date Mar. 17, 1986 PCT Filed Jun. 27, 1985 PCT Pub. No. WO86/00954 PCT Pub. Date Feb. 13, 1986.A downhole motor includes a bearing unit connected to a moving section incorporating successively arranged working members-a stator and a rotor interacting with each other along profile surfaces. The like pairs of the adjacent working members are rigidly connected to each other by means of solid threaded bushings. A mounting fixture includes two mounting elements each made as two bushings interconnected by a coupling, the bushings having their profile surfaces located on the same longitudinal axis. One of the bushings is rigidly connected to the coupling, while the other bushing is mounted with the possibility of moving with respect to the longitudinal axis. A method of assembling the downhole motor is effected with the use of a pre-adjusted mounting fixture and resides in interconnecting the like working members by thread bushings ensuring the arrangement of the profile surfaces of the working members analogously to the profile surface of the single monolithic rotor and stator.