Adjustable constant-shooting-speed rock breaking sprayer

Abstract

The invention relates to an adjustable constant-shooting-speed rock breaking sprayer which comprises a shell and a spraying pipe, a pressure bearing part is formed at one end of the spraying pipe, the other end of the spraying pipe is provided with a spraying opening communicated with the interior of the spraying pipe, and the spraying pipe is arranged in the shell in a sliding mode. A plurality of drainage holes are formed in the shell; when the flow of the liquid entering the shell in unit time is equal to or smaller than the preset jet flow, the jet pipe blocks each drainage hole, and the liquid entering the shell flows through the jet pipe and is jetted out from the jet orifice; when the flow of the liquid entering the shell in unit time is larger than the preset jet flow, the liquid entering the shell pushes the jet pipe to slide in the direction away from the first opening end, at least part of the drainage holes recover to be communicated with the shell, and part of the liquid in the shell is discharged out of the drainage holes. The injection flow of the injection port to the liquid is equal to the preset injection flow. The technical problem that a nozzle used for jet flow rock breaking cannot provide stable jet speed is solved.

Description

technical field [0001] The present invention relates to the field of petroleum drilling engineering, and further relates to an adjustable constant-fire-rate rock-breaking nozzle, in particular to an adjustable constant-fire-rate rock-breaking nozzle based on high-pressure jet rock-breaking technology. Background technique [0002] In the process of petroleum exploration and development, high-pressure water jet rock-breaking technology is an efficient rock-breaking method, which has been widely used and researched, and has achieved remarkable results. Among them, the jet nozzle is a key component that converts fluid kinetic energy into high-pressure kinetic energy to crush rock mass and break rock. At present, self-advancing high-pressure nozzles are mostly used, and the jet flow modes of nozzles in high-pressure nozzles are generally straight jets, rotating jets, and straight jets. Rotary mixing jet or abrasive jet, etc. [0003] In the application of coalbed methane or sha...

AI Technical Summary

Problems solved by technology

[0004] 1. In the process of jet rock breaking, the rate of fire is mainly adjusted by controlling the pumping displacement of the ground pump truck. The adjustment effect cannot be observed underground, and then the rock breaking rate of fire is unstable due to the fluctuation of the displacement, and the jet operation area changes randomly. Irregular holes in nozzles are formed, which increases the resistance during drilling and affects the efficiency of jet drilling;

[0005] 2. Due to the surge of displacement caused by the pneumatic pressure of the manifold or other uncontrollable factors, in the high-speed environment, the front end of the nozzle will be eroded by sand and gravel due to the rock-breaking backsplash force, which may cause damage to the nozzle in severe cases And shorten the life of the nozzle

[0006] At this stage, various types of nozzles are also provided. Although these nozzles can achieve the effects of improving hydraulic energy utilization efficiency, reducing nozzle resistance, and improving drilling efficiency and drilling length, the injection speed of the above-mentioned nozzles is limited by the displacement. Fluctuation has a great influence, and it is impossible to form a stable rate of fire, resulting in irregular holes and poor quality of the jet, which affects the drilling efficiency; in addition, the jet backsplash at the front end of the nozzle will increase the erosion of the nozzle under sudden high displacement. Shorten the service life of the nozzle. Therefore, the existing nozzle cannot achieve the purpose of improving the quality of the hole and reducing the erosion of the nozzle to increase the life by providing a stable rate of fire.

[0007] Aiming at the problem that the nozzles used in jet rock breaking cannot provide a stable rate of fire in related technologies, no effective solution has been given so far

Images