Slurry pulsator

Abstract

The invention relates to a mud pulse generator, which mainly comprises a rotating pulse head, a pulse head supporting seat, a main shaft supporting mechanism, a main shaft assembly, a controlling and buffering mechanism, a solenoid valve assembly, a balancing piston mechanism, a pulse generator casing body and a pressure bearing electrode assembly. By matching the impeller and the rotor of the rotating pulse head as well as the flow passage and the area of the pulse head supporting seat, not only the mud pulse generator has higher adaptability, but also the quality of the pulse signals is improved; the main shaft assembly, the controlling and buffering mechanism and the solenoid valve assembly all adopt hidden structures and the key mechanisms can work in the hydraulic oil inside the casing body, so that the reliability of the mud pulse generator is improved; dynamic seal is only adopted between the bearing nut of the stator of the pulse head supporting seat and the main shaft. The balanced pressure difference between the inside and the outside of the casing body can be basically maintained through the balancing piston mechanism. Therefore, the dynamic sealing performance is good, and the service cycle is long. The mud pulse generator has the advantages of simple structure and low processing and use cost.

Description

technical field [0001] The invention relates to downhole measuring instruments for petroleum drilling, in particular to a mud pulse generator for downhole wireless measurement while drilling. Background technique [0002] The mud pulser is the most important part of the wireless drilling tool. It is used in the mud environment of high temperature, high pressure and strong vibration. It requires strong adaptability, high reliability, good signal quality and simple maintenance. The pulse signal quality of the mud pulser is poor, which will cause errors in the uploaded data; the reliability is poor, which will lead to tripping due to instrument failure and increase drilling costs. At present, the mud pulsators used in oil drilling mainly include negative pulse mud pulsators and positive pulse mud pulsators with a small valve pushing large valve structure. Due to the small valve head working directly in the mud, the latter has problems such as being easily blocked by debris car...

AI Technical Summary

Problems solved by technology

The pulse signal quality of the mud pulser is poor, which will cause errors in the uploaded data; the reliability is poor, which will lead to tripping due to instrument failure and increase drilling costs

At present, the mud pulsators used in oil drilling mainly include negative pulse mud pulsators and positive pulse mud pulsators with a small valve pushing large valve structure. Due to the small valve head working directly in the mud, the latter has problems such as being easily blocked by debris carried by the mud, erosion, wear and other problems. The above two mud pulsers have configurations that are difficult to change and mud pulse signals Instability and other issues

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