In-hole supercharger for high-pressure jet assisted drilling and operating method thereof

Abstract

The invention discloses an in-hole supercharger for high-pressure jet assisted drilling and an operating method thereof. The supercharger comprises a shell, wherein an upper piston sleeve, a lower piston sleeve and a high-pressure piston sleeve are arranged in the shell, a fixed valve element is further fixedly arranged between the upper piston sleeve and the lower piston sleeve, a movable valve element is further arranged in the fixed valve element in a penetrating mode, an upper piston is connected to the interior of the upper piston sleeve in a sliding mode, a lower piston is connected to the interior of the lower piston sleeve in a sliding mode, the end, close to the upper piston, of the lower piston penetrates through the movable valve element and is detachably connected with the upper piston, the lower piston is connected with the movable valve element in a sliding mode, a high-pressure piston is connected to the interior of the high-pressure piston sleeve in a sliding mode, the end, close to the lower piston, of the high-pressure piston penetrates through the high-pressure piston sleeve, and a penetrating high-pressure slurry channel is formed in the inner wall of the shell and the outer side walls of the upper piston sleeve, the lower piston sleeve, the fixed valve element and the high-pressure piston sleeve. The in-hole supercharger has the advantages of the simple structure, small equipment size and the like.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to an in-hole supercharger for high-pressure jet assisted drilling. Background technique [0002] The rock-breaking mechanism of conventional rotary drilling mainly relies on the mechanical rock breaking of the drill bit, and the bottom hole water jet (mud) mainly plays the role of cleaning cuttings, cooling and lubricating the drill bit. With the continuous increase of well (hole) depth, low ROP has become one of the main problems affecting the benefits of oilfield exploration and development. For this reason, people have researched and applied many technical measures to improve drilling speed. Among them, making full use of hydraulic energy is one of the effective ways to increase the drilling speed. [0003] The current underground pressurization scheme mainly includes the following methods: [0004] (1) The pilot valve + reversing valve scheme adopted by Flowdril...

AI Technical Summary

Problems solved by technology

The lost energy will increase the pressure drop of the system resulting in insufficient output pressure

[0006] (3) Screw-type downhole booster pump: the system first converts the high-pressure mud energy into rotational motion through the mud motor, and the conversion efficiency of the mud motor is low

In addition, the plunger is pushed and reversed by the cam, and the energy loss of the cam itself is relatively large. In the case of high pressure, the wear problem is serious.

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