Gas pumping-exhaust directional drilling tool and drilling method

Abstract

The invention discloses a gas pumping-exhaust directional drilling tool which comprises a hollow drill rod and a drill bit; a high-pressure gas path is connected to the hollow drill rod backwards; a pneumatic motor is connected to the front end of the hollow drill rod; an output shaft of the pneumatic motor is connected with the drill bit forwards; the position, behind the pneumatic motor, of thehollow drill rod is uniformly provided with more than three front pneumatic jacks in a circumferential direction; each front pneumatic jack is connected with the high-pressure gas path, and the connecting part of each front pneumatic jack and the high-pressure gas path is provided with a front electromagnetic valve used for controlling the working state of the corresponding front pneumatic jack; ajacking direction of each front pneumatic jack is perpendicular to an axis of the hollow drill rod; and the high-pressure gas path extends backwards to a high-pressure gas source outsides a drilled hole. The invention further discloses a corresponding drilling method. By adopting the gas pumping-exhaust directional drilling tool and the drilling method, self-propelled drilling is realized, a pipeis put down while drilling is performed, the drilled hole is timely supported, and operation of separately inserting a gas pumping-exhaust pipe does not need to be performed after drilling, so that the whole drilling process is safer, time-saving and efficient, lowers the operation difficulty and improves the working efficiency.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage. Background technique [0002] Coal mine gas disaster is the number one killer of coal mine safety production. Coal and gas outburst accidents, gas explosion accidents, gas burning accidents, and gas suffocation accidents seriously threaten the lives of coal miners and the property of coal mining enterprises, especially coal and gas outburst accidents and Gas explosion accidents often cause heavy casualties, bring heavy property losses to coal mining enterprises, and extremely serious damage to mines, which are extremely bad in nature and have extensive social impacts. Therefore, in order to ensure the safe and efficient production of coal mining enterprises, it is very important to control the gas well. [0003] Although the prevention and control of gas disasters is inseparable from a reliable ventilation system, it is precisely because ventilation cannot solve the gas problem or...

AI Technical Summary

Problems solved by technology

[0006] (1) The drill bit cannot achieve directional drilling, and the drill pipe will have different amplitudes of disturbance under the action of gravity, and it will become more significant as the hole depth increases. When encountering slightly complicated geological conditions, the drilling deflection will be more obvious

In my country, the drilling holes for coal seam gas drainage are designed to be straight holes, but the actual construction of the drilling holes has a certain deviation, which leads to the uneven distribution of coal seam drilling holes, and even the excessive spacing of some drilling holes, forming a gap for gas drainage. area or blank zone, the ideal sampling effect cannot be achieved

It is impossible to reduce the gas content in the blank zone and eliminate the risk of gas outburst, which is very easy to cause gas disaster accidents in coal mine production

[0007] (2) It is very easy to collapse the hole during the process of drilling the hole and retreating the rod, resulting in the blockage of the gas drainage channel

[0009] (3) The judgment of the location of the drill bit is lagging, that is, it is impossible to know the position and state of the drilling rig in a timely and accurate manner

[0010] The traditional gas drainage methods cannot solve the problems in the gas drainage drilling process well, such as: the drilling rig is not moving in a fixed direction during drilling, the gas drainage channel collapses during drilling or after drilling, traditional methods Gas extraction is difficult, time-consuming and labor-intensive, the quality of the extraction is not high, and the efficiency is low. Therefore, a new type of gas extraction drilling rig that can effectively solve the current problems is of great significance to the safe production of coal mines.

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