SU941526A1 - Positive-displacement hydraulic hole-bottom motor - Google Patents

Description

one

The invention can be used in the drilling of oil and gas wells, mining.

Known volumetric hydraulic downhole motor, comprising a housing, a multi-cylinder drive and a distribution node 1.

The closest technical solution to the invention is a volumetric hydraulic downhole motor, comprising a housing, a multi-cylinder drive, a distribution unit, pushers on the axles with helical surfaces of the right and left directions for interaction with two figured projections of the cylinder, the drive shaft 2.

The disadvantage of this engine is deformation (destruction) of the working profile of the pushers and figured protrusions of the drive shaft. When starting and operating the engine without load due to the autonomy of the drive cylinders, a pusher wedges on the plane (parallel to the generator of the drive shaft) of the figure ledge. When descending from the plane, the irreversibly working profile of the pusher and the figured protrusions of the shaft is deformed.

If, for example, the stroke frequency (double stroke time) of a pusher, taking into account the idling losses of the mechanical part of the engine (drive shaft, support (spindle), etc.), is less than the freewheel frequency of the remaining pushers (taking into account only its own losses) then the engine is seized with the frequency K fmax-fmin K - the frequency of seizure (by analogy with the frequency of the beating),

10 gpah and fmin of the stroke frequency of the pushers. In addition, a disadvantage is the emergency wear of the working surfaces of the figured protrusions of the shaft and pushers due to plastic deformation due to high specific pressures.

Claims (2)

15 The purpose of the invention is to improve the reliability of the launch and engine durability. The purpose of the invention is achieved by the fact that the engine is equipped with additional cylinders with shaped protrusions, the cylinders with shaped protrusions mounted on the drive shaft by means of ratchet couplings, free running, the beginning of coupling in which each cylinder is offset relative to other cylinders by an angle of 2d / n, where n is the number pushers, and the total number of cylinders is equal to the number of pushers. In addition, the free-wheeling ratchet clutch of each cylinder has working pairs of different lengths. In addition, each pusher has a spring-loaded ball, and the cylinders are made with longitudinal grooves for fixing the balls. FIG. 1 shows the engine, a longitudinal section; in fig. 2 — node I in FIG. 1 (freewheel couplings not shown); in fig. 3 shows section A-A in FIG. 2; in fig. 4 is a section BB in FIG. 3; in fig. 5 is a diagram of the arrangement of the working pairs of ratchet-tooth freewheel couplings of the upper, middle and lower sleeves. The hydraulic volumetric engine consists of a housing 1 with longitudinal grooves 2, thrust bearings 3 and 4, a multi-cylinder drive 5 with a distribution unit, including piston rods of b-8 pistons with pushers 9 equipped with right 10 screw surfaces and 11 left-side tension, cylinders 12 which are provided with figured protrusions 13 and 14 with helical surfaces 15 and 16 of the response form and are successively located on the drive shaft 17 on the freewheel ratchet sleeves 18. On the surface of the cylinders 12 there are made longitudinal grooves 19, and the plane 20 of FIG ur projections 13 and 14 are made parallel to the generator of the cylinder. In the guides 21 of the pushers 9, the channels 22 are provided in which the balls 23 with the spring 24 are placed. Along the contour of the pushers 9 there is a rolling track (groove) 25 equipped with a ball row 26. The engine works as follows. The energy source actuates the rods 6-8 with the pushers 9, which, having made reciprocating movements, come into periodic contact with the screw surfaces of the engagement 15 and 16 of the figured protrusions 13 and 14 of the cylinders 12 and rotate the latter clockwise. The torque from the cylinders 12 is transmitted to the shaft 17 of the engine using the freewheel ratchets 18. The engagement of the freewheel sleeves 18 of each cylinder 12 with the shaft 17 is shifted relative to each other in phase by an angle 2 11/3 (with three pushers) to prevent engine shaft stops, for example, if the start of the coupling for each power pair of the pusher-cylinder coincides in phase, the engine shaft will stop while simultaneously switching the pushers 9 to reverse (see Fig. 5). To shift the start of coupling, the ratchet-tooth coupling pairs of the free stroke 18 are made of different lengths 1 (1 is the maximum length of the working pair, see Fig. 5). To prevent the pushing of the pusher 9 to the top of the figure ledge 14 when the engine is started, the cylinders 12 are mounted during assembly when the spring-loaded ball 23 in the guide pusher 9 is fixed in one of the grooves 19 of the cylinder. To reduce the coefficient of friction and increase the torque, the rolling track 25 provided with balls 26 is made along the contour of the pushers 9. Axial forces from rods 6-8 of the actuator 5 are perceived by thrust bearings 3 and 4. The invention eliminates the destruction of the working surfaces of the shaped cylinder projections and pushers when start and engine operation without load. In addition, the replacement of a pair of sliding friction for a couple of rolling friction with the same engine dimensions increases the rotational speed, this time by 1.5-2 times. Claim 1. Full-volume hydraulic downhole motor, including housing, multi-cylinder drive, distribution assembly, tappets on piston rods with screw surfaces of right and left direction for interaction with two figured projections of the cylinder, drive shaft, characterized in that, in order to increase reliability start and durability, the engine is equipped with additional cylinders with figured protrusions, and with cylinders with figured protrusions mounted on the drive shaft through ratchet couplings This stroke, the beginning of the coupling of which in each cylinder is displaced relative to the other cylinders by an angle of 2il / n, where n is the number of pushers and the total number of cylinders is equal to the pusher pitch. 2. Engine according to Claim 1, characterized in that the free-wheeling ratchet clutch of each cylinder has working pairs of different lengths. 3. The motor according to claim 1, characterized in that each pusher has a spring-loaded ball, and the cylinders are made with longitudinal grooves for fixing the balls. Sources of information taken into account during the examination 1. USSR author's certificate No. 69420, cl. E 21 B 4/02, 1941. 2. USSR author's certificate number 463770, cl. Е 21 В 4/02, 1972 (prototype). / J / J 12 fug. one one  - / ff7O e / 7 // / 77tyJ 2f 6-6 F1 / d O / 3 / d f / J / j y- F1 / g. fPt / Z.5