Downhole High Efficiency Screw Drilling Tools

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 an oil drilling equipment, in particular to a high-efficiency screw drilling tool. Background technique [0002] In recent years, due to the increasing demand for oil resources, my country has accelerated the development of drilling technology, thus promoting the development and application of downhole power drilling tools. Screw drilling tools occupy a very important position in the current oil drilling. It was originally used in large quantities in vertical wells. With the needs of resource development, the emergence of some complex wells such as directional wells, horizontal wells, and extended-reach wells has made the screw drilling tools The performance advantages are more prominent, and at the same time, the problems encountered are also emerging one by one, and the screw drilling tools still have certain deficiencies. [0003] Among the currently used screw drilling tools, single-screw mechanical screw drilling tools ge...

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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