Underground water-hammer type pressure pulse generating tool

Abstract

The invention discloses a water-hammer type pressure pulse generating nipple comprising an external structure and an internal structure, wherein the external structure comprises an outer cylinder, an upper joint and a lower joint; and the internal structure comprises a flow guiding body, a valve wheel subassembly, a normally-open flow passage, a nozzle and two valve-control flow passages, wherein the flow guiding body is arranged at the upper end of the valve wheel subassembly, the valve wheel subassembly is arranged at the upper ends of the normally-open flow passage and the valve-control flow passages, the valve-control flow passages are periodically opened and closed through the valve wheel subassembly and are connected with the normally-open flow passage in parallel, and the nozzle is arranged at the lower end of the normally-open flow passage. In the invention, the valve-control flow passages are opened and closed by periodically rotating the valve wheels to generate water-hammer type pressure pulses.

Description

technical field [0001] The invention relates to the technical field of drilling in the petroleum industry, in particular to a water hammer pressure pulse generating tool. Background technique [0002] Hydraulic pulse drilling is to use the hydraulic pulse generator installed at the bottom of the well to generate pressure pulse waves at the bottom of the well. The pressure pulse wave acts on the bottom of the well to help remove cuttings at the bottom of the well, form an instantaneous negative pressure at the bottom of the well, and increase the drilling speed. In principle, the hydraulic pulse generating device is divided into the following two types: hydraulic oscillation type and throttling type. [0003] The hydraulic oscillating pressure wave generator generates pressure vibrations in the oscillating chamber through the structure of the fluid oscillating chamber. After the pressure vibration is amplified in the chamber, it is released through the outlet of the hydraulic...

AI Technical Summary

Problems solved by technology

However, the change of the flow area is limited and gradual, and there is no signal amplification design, so the amplitude and frequency characteristics of the hydraulic wave generated by the throttling tool are greatly restricted, and the amplitude is relatively small. Only a few atmospheric pressures pass through, and the effect is limited.

[0005] The above two kinds of hydraulic pulse generators, due to the limitation of the principle of hydraulic wave generation, have great limitations in amplitude and frequency characteristics, and have not been applied on a large scale.

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