Recoverable large-resistance high-pressure drill hole sealing device and using method thereof

Abstract

The invention discloses a recoverable large-resistance high-pressure drill hole sealing device and a using method thereof. The recoverable large-resistance high-pressure drill hole sealing device is characterized in that a high-pressure capsule assembly comprises a front capsule and a rear capsule, the front capsule and the rear capsule are sleeved with resistance increasing components with variable diameters, and resistance increasing fins are arranged on the resistance increasing components correspondingly; the rear end of the resistance increasing component of the front capsule and the front end of the resistance increasing component of the rear capsule are fixedly connected in a sealed mode through a rubber sealing barrel, the front end of the resistance increasing component of the front capsule and the rear end of the resistance increasing component of the rear capsule are sleeved with elastic sealing rubber rings respectively, and a leakage pressure monitoring space is formed between the front capsule and the rear capsule. By monitoring the pressure value in the leakage pressure monitoring space, high-pressure leakage early warning can be achieved, the situations of pluggingfailure and accidental disengagement of the high-pressure capsule assembly under the action of high-pressure water injection or gas injection counter-acting force can be avoided through the arrangement of the resistance increasing components, recycling can be achieved after the high-pressure capsule assembly contracts and resets, and the safety, reliability and economical efficiency of the high-pressure water injection or the gas injection operation of a coal seam are greatly improved.

Description

technical field [0001] The invention relates to a drilling sealing device and its use method, in particular to a recyclable high-resistance high-pressure drilling sealing device and its usage method which are suitable for coal seam anti-permeability through hydraulic fracturing or coal seam gas injection, and belong to the category of coal mine gas disasters. Control and efficient development of technical fields. Background technique [0002] Coalbed methane (or called gas, natural gas) is an important energy resource in the world. Because of its low pollutants and high calorific value, it is considered to be an efficient and clean energy. Coalbed methane is mainly a derivative produced during the coal-forming process. There are two main mining methods for coalbed methane: one is usually ground drilling and extraction, and the other is underground drilling for extraction. However, the low gas permeability of the coal seam makes it difficult to desorb and flow coal seam gas,...

AI Technical Summary

Problems solved by technology

There are still defects in this plugging method: on the one hand, relying on the capsule as the main body of the hole to mainly resist the high-pressure reverse force of high-pressure water injection or gas injection, the outer surface of the expanded capsule directly contacts the inner wall of the borehole, causing The fatigue strength of the capsule and the friction from the inner wall of the borehole can easily cause fatigue wear of the capsule, greatly reducing the service life, often resulting in failure to recycle and continue to use, and increasing the cost of use; After the cracks, the leakage can be further reduced, but the leakage is still unable to be monitored, and there is still the problem that it is impossible to monitor and predict when the pressure of water injection or gas injection reaches a certain value, which will cause plugging failure

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