Jam releasing device and method for hydraulic fracturing packer of underground long drill hole in coal mine

Abstract

The invention discloses a jam releasing device and method for a hydraulic fracturing packer of an underground long drill hole in a coal mine. The jam releasing device comprises a valve body, a plunger ball seat, a low-density ball, a lower connector and a spring, wherein one end of the lower connector is connected with the valve body, the other end of the lower connector is connected with a packer, a plurality of water outlets are formed in the positions, which correspond to the plunger ball seat, of the valve body, the plurality of water outlets are distributed around the valve body and are arranged towards the bottom of the hole, and a certain included angle is formed between the water outlets and the central axis of the valve body; and the spring is located in a cavity where the valve body and the lower connector are connected, one end of the spring is abutted with the plunger ball seat, and the other end of the spring is abutted with the lower connector. According to the jam releasing device, the technical problem that the in-hole fracturing packer cannot retreat smoothly when encountering resistance is solved, the device has the advantages of simplicity, convenience in operation and high jam releasing success rate, the risk of encountering resistance of the hydraulic fracturing packer of the long drill hole can be effectively reduced, the hydraulic construction efficiency is improved, and the fracturing engineering loss is reduced.

Description

Technical field [0001] The present invention relates to the field of hydraulic fracturing techniques, and more particularly to a coal mine well drilled hydraulic pressure fracturing clipper, a method, and a method. Background technique [0002] Hydraulic fracturing technology is an important means of coal seam gas strengthening and impacting prevention and treatment. With the continuous development and progress of drilling equipment and hydraulic fracturing equipment under coal mine, underground hydraulic fracture has been drawn by traditional wear The fracturing transition is a long bore (hole depth> 300m). Long bore hydraulic fracturing usually takes a quick and fixed-point sealing method, and is a bare eye fracturing, that is, the fracturing segment does not carry out casing and cement solid holes. [0003] For the naked eye fracturing, due to the objectivity of the formation pore and the fracture, the packer is affected by the pressure difference during the fracturing proc...

AI Technical Summary

Problems solved by technology

A large amount of coal (rock) debris accumulated in the annular space greatly increases the friction between the packer and the hole wall, and even causes blockage, which directly causes the packer to be stuck and causes fracturing accidents in the hole. It is difficult to deal with this problem Big, high risk, the existing unblocking operation can easily cause the fracturing string in the hole to break, which in turn leads to the interruption and failure of the fracturing project, and the loss is relatively large

The blockage of the fracturing packer has seriously affected the popularization and application of hydraulic fracturing technology for long boreholes, and the problem needs to be solved urgently

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