Efficient positive displacement motor drill under well

Abstract

An efficient positive displacement motor under a well comprises a bypass valve assembly, a falling prevention joint, a motor joint, a universal joint assembly and a bearing joint assembly. The efficient positive displacement motor under the well is simple in structure, convenient to use, stable in operation under the well, safe, reliable, high in complete machine efficiency, capable of outputting larger torque, long in working time and service life, suitable for drilling needs of various complex wells at the present, free of piercing leakage and high in working reliability. A streamlined flow channel enables water conservancy losses of a main flow channel to be reduced, turn-off force is large, the defects of the interference effect and tooth form distortion of the conjugation curvature of a traditional single-screw machine type positive displacement motor are overcome, a universal shaft operates flexibly, energy efficiency is high, the universal shaft can work in the environments where no sand grain exists, and drilling fluid erosion exists, the service life is long, and mechanism strength is high.

Description

Technical field [0001] The invention relates to a petroleum drilling equipment, in particular to an efficient screw drilling tool. Background technique [0002] In recent years, due to the increasing demand for petroleum resources, my country has accelerated the development of drilling technology, which has promoted the development and application of downhole power drilling tools. Screw drilling tools occupies a very important position in current oil drilling. They were initially used in vertical wells. With the need for resource development, the emergence of directional wells, horizontal wells, extended reach wells and other complex wells has made screw drilling The performance advantages are more prominent, and the problems encountered at the same time also emerge one by one, and the screw drilling tools still have certain shortcomings. [0003] Among the currently used screw drilling tools, single screw mechanical screw drilling tools generally have the disadvantages of complex...

AI Technical Summary

Problems solved by technology

[0003] Among the currently used screw drilling tools, the single-screw mechanical screw drilling tools generally have disadvantages such as complex conjugated meshing surfaces, difficult manufacturing and high precision requirements, many leakage channels, and easy to form inter-teeth interference and linear distortion.

The length of the upper and lower radial straightening bearings of ordinary screw drilling tools for straightening is 400mm~500mm. This length is set to ensure that the mud flow rate for cooling and lubricating the metal rolling bearing group is within a certain range. The length of the radial centering bearing is arranged at the upper joint and the lower joint of the bearing section shell, so that although the length of the bearing section is shortened, the concentricity of the radial centering bearing and the metal rolling bearing group is reduced, so that the radial centering bearing Poor righting effect

In the mud for cooling and lubricating the metal rolling bearing group, the larger solid-phase grinding sand particles will enter the inner cavity where the bearing group is located, causing the bearing to wear and fail

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