Induced flow device and method for water jet kerf in drilled hole
A water jet and drilling technology, which is applied in the direction of safety devices, drill bits, mining fluids, etc., can solve the problems of limited jet cutting range and powder discharge capacity, affecting equipment reliability, and blockage of drilling jets, etc., to achieve expanded damage Range of influence of pressure relief, wide applicability, effect of improving air permeability
Active Publication Date: 2013-03-13
CHINA UNIV OF MINING & TECH
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Problems solved by technology
Under the condition of high gas and soft coal seam, the gas gushing is serious, and the nozzle hole and coal body collapse are prone to occur during the cutting process, resulting in the blockage of the drill hole and the ejector in the drilling hole, resulting
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[0015] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0016] The water-jet slotting and spraying device in the borehole of the present invention is mainly composed of a drill body 1, a pressure control valve 2, an alloy blade 3, a double-jet flow generator 4, and a one-way valve 5. The drill body 1 has a Stepped through hole, the left end hole of the drill bit body 1 is connected with the drilling machine, the internal interval of the stepped through hole of the drill bit body 1 is provided with a pressure control valve 2 and a one-way valve 5, and the wall of the drill bit body 1 between the pressure control valve 2 and the one-way valve 5 A double-jet generator 4 is arranged symmetrically up and down, and a plurality of wing-shaped alloy blades 3 are arranged on the front portion of the drill bit body 1; and springs; the alloy blades 3 are three pieces arranged at an angle of 120 degrees, and the horizontal ...
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The invention provides an induced flow device and a method for water jet kerf in a drilled hole. The device comprises a drill bit body, wherein a stepped through hole is formed in the drill bit body; a pressure control valve and a one-way valve are arranged in the stepped through hole in such a manner that an interval is formed between the pressure control valve and the one-way valve; double fluidic generators are symmetrically arranged up and down on the wall of the drill bit body, which is between the pressure control valve and the one-way valve; and a plurality of wing-shaped alloy blades are arranged in the front of the drill bit body. Two high-pressure jet beams are jet from the water fluidic generators, so as to conduct double jet slotting on coal of drilled hole walls with different sections, form a local to entirety 'point-surface-body' destructive function, and guide the coal to generate instable orifices and expand in the radial direction of the drilled hole in a certain range, enlarge drilling pressure relief influenced area, and realize efficient methane gas exploitation; efficient coal cutting of water jet is realized; the phenomena of drill holding, drill bit loss and the like caused by jet emitter blockage due to pulverized coal and drilled hole blockage due to coal slay during the jet kerf induced flow process are avoided; and the purpose that coal bed methane gas exploration and outstanding hazard elimination for a high- methane gas floppy complex coal bed are carried out by adopting manual permeability increasing method is realized.
Description
technical field [0001] The invention relates to a device and method for inducing water jet slotting in a borehole and is especially suitable for pressure relief and permeability enhancement of high-gas soft and complex coal seams and elimination of coal and gas outburst risks in coal seams. Background technique [0002] The fundamental means of gas control in mines in my country is gas drainage measures based on borehole gas drainage. As my country's coal mines enter deep mining, problems such as poor coal seam permeability, difficult gas extraction, and prominent dynamic phenomena are becoming more and more serious. The measure is an effective measure to improve the efficiency of coal seam gas drainage and has been widely used in the field. The technology of high-pressure jet slotting in the borehole for pressure relief and anti-reflection technology uses high-pressure water jets to erode the coal body to form pressure relief slots, which expands the effective range of boreh...
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Login to View More IPC IPC(8): E21B10/61E21B10/54E21B10/43E21F7/00E21B43/26
Inventor 林柏泉沈春明邹全乐张其智
Owner CHINA UNIV OF MINING & TECH