Positive pulse device for slurry under shaft

Abstract

The invention discloses a positive pulse device for high-speed slurry under a shaft. The positive pulse device comprises an output terminal, a valve body and generator assembly, an intermediate bearing bush and top assembly which are connected sequentially, wherein the top assembly comprises a piston and a spring which are arranged in a shell on the top and a plunger pump and a tilting tray which are arranged at the upper end of the intermediate bearing bush; the plunger pump comprises a plunger pump shell and a plunger positioned in the plunger pump shell; an oil drainage hole is formed in the shell on the top and is positioned on the end part below the shell on the top; and a return spring is arranged between the shell on the top and the piston. In order to overcome the defect of slow data transmission of the conventional pulser, according to the positive pulse device, parts such as the oil drainage hole, the plunger, the tilting tray and the like are improved, namely a slant angle of the tilting tray is improved, the round-trip distance of the piston is shortened, the speed of pulses is improved, and the return spring is arranged between the piston and the pump additionally to change the response speed of the return stroke of the pulser, so that the response speed of the pulser is improved, and the data transmission speed of high-speed pulse interval data formats is ensured.

Description

technical field [0001] The invention belongs to the field of petroleum drilling engineering, and in particular relates to a downhole device for wirelessly measuring well deviation and relevant geological parameters while drilling in petroleum drilling. Background technique [0002] MWD (Measurement While Drilling) and LWD (Logging While Drilling) are the key technologies for completing large-angle and horizontal well drilling, real-time data acquisition, interpretation and on-site decision-making at the well site, and guiding the completion of geosteering drilling. The most important part of the drilling measurement system, the signal is mainly transmitted through the pressure wave of the drilling fluid. The basic principle of mud pulse transmission is that the signal measured by the downhole sensor is coded, and the drive control circuit of the pulser drives the cone valve, rotary valve or rotor of the mud pulser to work, resulting in a interception effect, thereby generati...

AI Technical Summary

Problems solved by technology

[0004] 1. The working principle of the mud negative pulse generator is that by opening a relief valve, the mud in the drill string can flow into the annulus of the wellbore through the relief valve and the discharge hole on the drill collar, thereby causing a The mud pressure is reduced, but because the mud negative pulse generator has strong erosion damage to the formation, it will cause relatively serious damage to the well wall, and has a relatively strong erosion effect on parts, and it consumes a lot of power. The structure of the instrument is relatively Complicated, not conducive to assembly, operation, maintenance

[0005] 2. The working principle of the mud continuous wave pulse generator is to use the rotary valve to generate a fixed frequency pressure continuous wave, and encode and decode the information according to the phase shift of the continuous wave, but the mud continuous wave pulse generator also has complex structure and expensive manufacturing cost And other issues

However, due to the slow transmission speed of mud positive pulse transmission signal data, this system is not suitable for transmitting a large number of geological data parameters

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