Speed increasing tool for underground drilling tool

Abstract

The invention provides a speed increasing tool for an underground drilling tool. The speed increasing tool comprises a conversion assembly, an energy storage assembly and an impact assembly, wherein the conversion assembly is connected with a rotary power source of the drilling tool to provide rotary power, the conversion assembly comprises a first outer cylinder and a transmission shaft, a speeddifference exists between the first outer cylinder and the transmission shaft, the energy storage assembly is connected to the lower end of the conversion assembly and comprises a second outer cylinder fixedly connected with the first outer cylinder, a center shaft fixedly connected with the transmission shaft and a torsion impact piece fixedly connected with the second outer cylinder in the circumferential direction, the impact assembly is used for generating impact force and comprises an impact body, the upper end part of the impact body is fixedly connected with the central shaft in the circumferential direction, the torsional impact piece and the impact body synchronously rotate along with the second outer cylinder and the center shaft to generate a rotating speed difference so as to generate relative rotation, and the torsional impact piece is configured to periodically and axially compress, store and release energy under the action of the relative rotation, so that the torsionalimpact piece generates periodic axial impact on the impact body, and the axial impact transmitted to a drill bit.

Description

technical field [0001] The patent of the present invention relates to the technical field of downhole tools in oil and gas drilling engineering, in particular to a speed-increasing tool for downhole drilling tools. Background technique [0002] With the development of oil and gas fields, oil and gas exploration is gradually moving towards deeper layers, and oil and gas well engineering has higher and higher requirements for drilling speed increase technology. At present, in the practice of oil and gas well engineering, the rotary percussion method is mainly used to increase the drilling speed of the drilling tool to improve the rock breaking efficiency, especially in the drilling process of deep and ultra-deep wells in hard formations. Rotary percussion drilling technology can be divided into three types in terms of working principle: jet impactor, hydraulic pulse impactor and mechanical impactor. Among them, the jet impactor uses the jet element to change the direction of ...

AI Technical Summary

Problems solved by technology

For example, the adjustable range of performance parameters such as impact power and impact frequency of the speed-up tool is relatively small, and the applicability of the tool is poor

Moreover, the performance parameters of the speed-up tool cannot be determined on the ground, and the correlation between the magnitude of the axial impact force and drilling parameters such as the weight on bit is too strong, and the actual application effect of the speed-up tool is not ideal

In addition, while realizing the impact function, the high-speed rotation function of the screw drilling tool is sacrificed. Its function is relatively single, and the speed-up effect is not obvious. Moreover, the internal structure of the speed-up tool is complex, there are too many parts, the failure rate is high, and the service life is long. short, poor reliability

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