Horizontal well self-guiding hydraulic water injection device and method

Abstract

A self-guiding hydraulic water injection device and method for a horizontal well, the device includes an upper joint, a liquid cylinder, a connecting sleeve, a push rod, a gravity rod, a direction control ring, a rotating ring spray gun assembly and a lower joint, and the device is connected to the middle and lower joints of the pipe string After entering the designed perforation position, the pressure in the wellbore is increased, and the hydraulic cylinder moves downward by hydraulic pressure, driving the push rod and gravity rod to move. Rotate, then connect the spray gun assembly with the steering ring, and perform perforation after the angle is determined. Therefore, the present invention is not affected by the pipe string structure and the wellbore environment, and the positioning method is not affected by the external environment. When the pressure in the tool is raised , The self-guiding mechanism forces the injection hole to turn, and the orientation of the injection hole is accurate and reliable. Therefore, the invention can effectively avoid downhole accidents caused by shooting through invalid or dangerous formation directions, and improve the recovery rate of coal bed gas and the effect of gas disaster control.

Description

technical field [0001] The invention relates to the technical field of underground gas extraction in mines, in particular to a horizontal well self-guiding hydraulic water injection device and method for coalbed gas well stimulation and gas control wells. Background technique [0002] As the development of coalbed methane advances towards complex geological conditions, in order to improve the recovery rate and development effect of coalbed methane, in the process of fracturing and increasing production of coalbed methane wells and controlling coal mine gas disasters, the preset position of hydraulic sandblasting is realized through self-guiding And other special operations have become one of the indispensable means. [0003] At present, the common solutions are mainly divided into two types, mechanical directional water jetting and cable instrument supporting directional water jetting. Among them, mechanical directional hydraulic jetting is mainly used in horizontal well op...

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Problems solved by technology

Among them, mechanical directional hydraulic jetting is mainly used in horizontal well operations. By installing eccentric components on the working tool string, relying on the gravity stroke turning torque of the eccentric component, and then controlling the rotation of the entire tool string to achieve hydraulic jetting at a preset position. The rotation torque is small, and it is greatly affected by the cleanliness of the downhole environment, the friction of the wellbore, and the friction of the tool seal assembly, which can easily cause inaccurate or large deviations in the perforation direction, and ultimately seriously affect the directional perforation direction

The directional hydraulic injection carried out by the cable instrument is mainly used in vertical wells. By using the gyroscope and the directional key to measure the azimuth of the downhole spray gun, and by continuously rotating the operation string on the ground, the operation string is finally consistent with the preset azimuth. In the actual operation In the process, due to the limitation of the operation well type, the horizontal section cannot be measured by the electronic gyroscope, and the final application range is narrow

[0004] To sum up, the two common orientation methods currently have problems such as large orientation errors and difficult operations, and it is difficult to accurately reduce the gas pressure and gas content of the coal mining face, and it is difficult to accurately achieve the goal of enhanced underground gas drainage

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