Rear-mounted double-channel abrasive jet slotting device

Abstract

The invention relates to a rear-mounted double-channel abrasive jet slotting device, and belongs to the field of coal seam pressure relief and permeability improvement. The rear-mounted double-channel abrasive jet slotting device mainly comprises an ultrahigh-pressure clean water pump, an ultrahigh-pressure hose, an ultrahigh-pressure rotary water tail, an abrasive pumping device, an abrasive rotary sealing water tail, a double-channel sealing drill rod and a double-channel slotting device. The ultrahigh-pressure clean water pump provides a jet flow power source, and the ultrahigh-pressure hose, the ultrahigh-pressure rotary water tail and the double-channel sealing drill rod ensure safe transmission of high-pressure water. The abrasive pumping device, the abrasive rotary sealing water tail, the double-channel sealing drill rod and the double-channel slotting device form an abrasive sand adding channel, and double-channel supply of high-pressure water transmission and abrasive transmission separation is achieved. According to the rear-mounted double-channel abrasive jet slotting device, the double-channel abrasive jet slotting device is innovatively invented, and abrasion to a high-pressure hose and a drilling tool in the abrasive and high-pressure water mixed conveying process is avoided. Meanwhile, the on-way pressure loss of the high-pressure water is avoided, the high-pressure water jet slotting coal breaking capacity is greatly improved, and the service life of equipment is prolonged.

Description

technical field [0001] The invention belongs to the field of coal seam pressure relief and antireflection, and relates to a rear-mounted dual-channel abrasive jet slotting device. Background technique [0002] Coal seam pressure relief and permeability enhancement is one of the effective means for the prevention and control of coal-rock gas dynamic disasters. In recent years, with the development of coal mine disaster prevention technology and equipment, hydraulic measures have become one of the main technical means for pressure relief and permeability enhancement of coal seams. In particular, hydraulic slotting technology has strong coal breaking ability and a wide range of effective pressure relief, and has been widely used. However, due to the increase of coal mining depth, the influence of factors such as the increase of ground stress and the increase of coal rock firmness coefficient, the ability of water jet slotting to break coal has declined, which seriously restric...

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Problems solved by technology

[0004] In view of this, in view of the problems that the coal mine abrasive jet slitting device has great wear on the drilling tool, short service life, and serious pressure loss along the way, the purpose of the present invention is to provide a rear-mounted dual-channel abrasive jet slitting device to realize high-pressure water and abrasive dual-channel transmission, to avoid the abrasion of abrasives on high-pressure transmission pipelines and drilling tools under the action of high-pressure water, so as to prolong the service life of the device

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