Downhole continuous wave mud pulse generator

Abstract

The invention provides a down-hole continuous wave mud-pulse generator. The down-hole continuous wave mud-pulse generator comprises a cylindrical shell, a main shaft is arranged on the shell, the lower end of the main shaft is provided with a vertical pipe, the upper end of the vertical pipe is movably connected with a bearing at the lower end of the main shaft, and the lower end of the vertical pipe is fixedly connected in the lower end of the shell. A blind hole is formed in the middle of the lower end face of the main shaft, a vertical water-proof motor is fixedly installed on the top in the shell, and the lower end of an output shaft of the water-proof motor is fixedly connected with the upper end of the main shaft. Through simple and smart design, the high pressure which the generatorinstantaneously withstands is buffered, the curve of the withstanding mud high pressure cannot be steppedly instantly increased but slowly changes in a continuous curve, the generator can be effectively protected against impact damage caused by instantaneous high pressure, the mud-pulse strength cannot be affected, the installation firmness between the generator and a drill collar can be improved, and the situation that the generator falls off is avoided.

Description

technical field [0001] The invention belongs to the field of petroleum measurement-while-drilling devices, in particular to a downhole continuous wave mud pulse generator. Background technique [0002] As the core part of the measurement while drilling, the mud pulse generator can be divided into positive pulse, negative pulse and continuous wave pulse generator according to its working principle. Negative pulse is rarely used due to the serious damage to the well wall, the complex structure of the downhole instrument, and the inconvenience of assembly, operation and maintenance. Mud positive pulse generators are widely used, but the transmission rate is low. With the development of technology, it can no longer meet the needs of large data transmission. The advantage of the continuous wave mud pulse generator is its fast transmission speed, which is one of the key technologies for development at present. The continuous wave system uses a rotary valve to generate a constant...

AI Technical Summary

Problems solved by technology

During the working process, high-pressure drilling fluid passes through the inside of the continuous wave mud pulse generator. During use, the internal components need to withstand the high pressure that increases periodically and instantaneously, which is easy to be damaged and affects the overall service life of the mud pulse generator.

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