A high-pressure hose and hydraulic jet radial drilling method

Abstract

The invention discloses a high-pressure hose, which includes a hose body and an outer sleeve; the outer sleeve is formed by sequentially connecting several single sections, and when the hose body is bent, high-pressure water flow can be sprayed from adjacent single sections . And a hydraulic jet radial drilling method, the method uses a high-pressure hose, when the drilling power is insufficient, the high-pressure hose is bent to form a bend, and the high-pressure water flow at the bend is sprayed on the pipe wall to form a reverse The thrust pushes the curved section to progress along the hose body until the last formed curved section reaches the hydraulic jet drill bit, thereby increasing the drilling depth of the hydraulic jet drill bit. It solves the problem that the current self-propelled hydraulic jet drill bit is difficult to drill into deeper formations under the condition of increased friction and insufficient self-propelled force.

Description

technical field [0001] The invention relates to radial drilling technology in unconventional oil and gas exploitation (such as coal rock), in particular to a hydraulic jet radial drilling technology. Background technique [0002] At present, hydraulic fracturing technology is the most commonly used stimulation measure in unconventional oil and gas exploitation, which can greatly improve the exploitation efficiency and recovery degree of oil and gas resources. However, for rock formations with special physical properties, such as coal rocks (high Poisson’s ratio, low Young’s modulus, low strength, high plasticity, and natural fractures), short and wide fractures are easy to form near the wellbore. It is difficult to form high conductivity and stable long fractures in the fracture mode, so the communication ability is limited. [0003] The hydraulic jet radial drilling technology can drill one or more horizontal holes radially distributed perpendicular to the main wellbore. ...

AI Technical Summary

Problems solved by technology

[0004] However, the current radial drilling technology uses conventional high-pressure hoses or coiled tubing to connect self-propelled hydraulic jet drill bits. After drilling radially to a certain depth, the frictional resistance increases due to the bending of conventional high-pressure hoses or coiled tubing. , the self-progression force is insufficient, and it is difficult to drill deeper formations, which can only reach about 100m, which seriously restricts the length of the fracturing controllable well section. Therefore, it is necessary to improve the existing technology to achieve longer radial channel drilling. Enter

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