SU945340A1 - Screw-type hole-bottom motor - Google Patents

Description

(5A) SCREW DRIVING ENGINE

The invention relates to a drilling technique, and in particular to a downhole motor designed for drilling oil and gas wells.

Known gerotor screw mechanism containing working bodies,. stator and rotor, in the form of a conical screw gyratory mechanism, cardan joint, shaft and radial-resistant bearing joint venture.

The disadvantage of the device lies in the fact that during tripping operations there is no flow of flushing fluid to the mine working bodies of the engine.

 A close solution of the known ones is a downhole hydraulic motor containing working bodies, a stator and an axially movable rotor in the form of a screw gyratory motor, a shaft and a angular contact bearing t2.

A disadvantage of the known engine is that the durability of the working bodies is limited due to the wear and change in the dimensions of the rotor and stator teeth and, consequently, the appearance of a gap in the pair, which leads to a decrease in the load characteristic of the engine.

The purpose of the invention is to increase engine durability.

The goal is achieved by

This means that the engine is equipped with a replaceable jacket mounted on the shaft to limit the rotor travel upwards, and the working bodies are made with conical helical surfaces, the tops of the cones of which are facing upwards towards the flow of flushing fluid.

FIG. 1 shows a general view of a screw downhole motor, a longitudinal section; in fig. 2 is a section A-A in FIG. t; in fig. 3 is a section BB in FIG. one.

Claims (2)

SCREW. A bottomhole motor contains working bodies in the form of a screw gerotor mechanism, comprising a stator 1 and an axially movable roto. The rotor 2 and the stator 1 are made with a to. Nical helical surfaces with the tops of the cones facing the moving flow of flushing fluid Rotor 2 through the universal joint .3 and adapter 4 are connected to the shaft 5. On the shaft 5 of the spindle there is an intermediate sleeve 6, on which the radial-proof bearing 7 is mounted. is coupled with the shaft 5 of the spindle shaft by means of a groove connection, which is axially movable,. for example spline. The bearing is fixed on the intermediate sleeve 6 of the nuts 8. On the shaft 5 of the spindle between the lower thrust end of the intermediate sleeve and the shaft shoulder there is a replaceable coupling 9, limiting the upward movement of the rotor and having a longitudinal connector. Coupling parts are interconnected, for example, by means of bolts Yu. The downhole motor operates as follows. When pumping a fluid, in the absence of a downhole load on the bit, the PS5D is affected by the weight of the rotating parts of the engine and the force from the pressure pass acting at the initial moment on the rotor, the spindle shaft together with the coupling and the rotor moves down by the value H to the stop the end face 0 of the adapter k in the upper end face g of the intermediate sleeve 6. This opens the passage of fluid into the formed gap between the rotor and the stator. When an axial load is created on the D9LOTO, the spindle shaft moves along the groove connection up to the stop of the coupling end at the lower end of the intermediate sleeve, and the rotor of the engine occupies the upper position (Fig. 1), providing a certain tension on the working pair. With the upper position of the moving system of the engine and the supply of flushing fluid under pressure, the planetary rotor movement is converted into coaxial rotation of the spindle shaft when the propeller shaft is transmitting torque and the hydraulic axial load from the rotor. In order to restore the degree or contraction of the conical working parts due to the wear of the screw surfaces of the teeth after the engine is raised to the surface, a new interchangeable coupling is installed along the height of the smaller height L of the previous coupling. By reducing the height of the coupling, the rotor moves upward relative to the stator and, therefore, the tension is restored in the working pair and the load capacity of the engine. The implementation of a downhole motor with conical working bodies, which have the possibility of relative axial movement, improves the durability of the engine by repeatedly restoring the compression ratio of the stator plate when the working bodies are worn, to create an optimal tension in the pair. The presence of a replaceable clutch, with possible axial re-rotation of the rotating parts of the engine, allows the engine to recover its capacity in drilling conditions when the screw surfaces of the working parts are worn. In addition, in the absence of axial load on the bit and, consequently, there is a gap in the conical working bodies of the engine, the flushing fluid is circulated in the well bore, as well as the flushing or filling of the drill string with flushing fluid during the launching operation without the use of additional devices. Claims An downhole motor comprising working bodies, a stator and an axially movable rotor in the form of a screw gerotor mechanism, a shaft and a radial-thrust bearing, characterized in that, in order to increase engine durability, it is equipped with a replaceable coupling mounted on the shaft to limit the rotor stroke up, and the working bodies are made with conical helical surfaces, the tops of the cones of which are facing upward to meet the flow of washing liquid. Sources of information taken into account in the examination 1. The author's certificate of the USSR f i (00689, class E 21 B 3/12, 1970. 2. USSR author's certificate F, cl. Е 21 В 3/12, 1973. TO h t