Directional fracturing top control and pressure relief device for hard roof

Abstract

The invention discloses a directional fracturing top control and pressure relief device for a hard roof, which can effectively improve the pressure relief efficiency and effect and ensure the pressurerelief capacity through the modes of hole washing, groove cutting treatment, hole sealing and fracturing. During groove cutting, a venturi tube is utilized, and cutting particles can be directly fedinto cutting liquid or hole washing liquid, so that radial groove cutting treatment can be directly achieved, and the follow-up pressure relief effect is guaranteed. By the manner disclosed by the invention, cutting equipment does not need to be specially arranged, a fracturing pipe does not need to be pulled out after hole washing, operations can be completed, and the operation effect is guaranteed. Radial groove cutting treatment can be achieved; and besides, during groove cutting, a high-pressure spraying sleeve is arranged in a rotating manner, through rotation of the high-pressure spraying sleeve, impact and spraying force in the rotating direction can be provided for the cutting particles, the high-pressure cutting capacity is improved, and rapid and efficient operations are achieved.

Description

technical field [0001] Specifically, the invention relates to a directional fracturing control roof pressure relief device for a hard roof, and relates to the related field of directional fracturing pressure relief for a hard roof. Background technique [0002] If the hard roof cannot be relieved in time during the coal mining process, it is extremely easy to form a large-area suspended roof. Once the suspended roof breaks, it will instantly cause damage to the roadway and seriously threaten the safety of the coal mine. Therefore, the weakening of the hard roof is the key to the control of coal mine roof disasters. At present, the most commonly used methods of weakening the hard roof are blasting broken roof and hydraulic fracturing. Due to the high safety hazard of blasting broken roof, it will greatly interfere with production; hydraulic fracturing uses high-pressure water to break the roof, and the construction process is relatively simple. The controllability and operab...

AI Technical Summary

Problems solved by technology

However, the current pressure relief for fracturing is relatively simple. Generally, direct high-pressure fracturing is performed in the borehole. However, due to the relatively hard roof, the pressure relief effect is not ideal, and the required pressure is extremely high. High equipment requirements and high energy consumption

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