Drilling, pressing and vibrating combined pressure-relieving coal bed gas exploitation method
A three-in-one, coalbed methane technology, applied in the fields of mining fluids, earthwork drilling, mining equipment, etc., can solve the problems of high gas content, low coal seam permeability, and difficulty in coalbed methane extraction, so as to improve permeability and increase drainage. The effect of efficient, simple and reliable extraction operations
Inactive Publication Date: 2012-11-07
河南省迪卡尔机电设备制造有限公司
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Problems solved by technology
Due to the complex geological conditions of coal seams in my country, high gas content, and low permeability of coal seams, there are great difficulties in coal seam gas extraction. method, but each has its specific adaptation conditions
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[0017] The present invention will be further described below in conjunction with an embodiment (accompanying drawing):
[0018] Such as figure 1 Shown, drilling, pressing, vibrating trinity of the present invention pressure-relief mining coalbed methane method, concrete implementation steps are as follows:
[0019] (1) First understand in detail the physical characteristics and geological structure characteristics of the extraction target coal seam 1, and if necessary, cooperate with testing measures such as geodesic stress;
[0020] (2) Select one or more orientations with relatively high hardness or relatively high density on the coal seam 1 as the bedding or through-bedding vibrating hole 2 hole positions, and at the same time, arrange a vibrating hole 2 hole position at an appropriate distance around each vibrating hole 2 hole position Or multiple fracturing holes 3 holes;
[0021] (3) Then, adopt known tool technology one by one to carry out drilling operation to the ho...
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The invention discloses a drilling, pressing and vibrating combined pressure-relieving coal bed gas exploitation method, which comprises: drilling holes at the positions of vibration holes (2) and fracturing holes (3), which are distributed one by one, by using known tool and technology; on the fracturing holes (3), fracturing a coal bed (1) by using fracturing equipment of which the outside diameter is matched with the aperture of the fracturing holes (3) and by a pressure higher than a stratum cracking pressure, and after the fracturing, starting vibration equipment to allow the vibration equipment to perform continuous vibration operation in the vibration holes (2) at a proper vibration frequency; and mounting gas production equipment on the fracturing holes (3), and relieving pressureof the coal bed (1) and drainage coal bed gas by using the conventional method. In the invention, the flowing state of the coal bed gas in the coal bed (1) is improved; and the coal bed is subjected to alternating tensile stress and pressure stress so that the coal bed gas can desorbs, diffuse and flow from micropores, which creates a good condition for the internal pressure relief and coal bed gas release and flowing and increases the drainage efficiency of the coal bed gas.
Description
technical field [0001] The invention relates to the technical field of coal-bed methane mining technology, in particular to a pressure-relief mining method for coal-bed methane that integrates drilling, pressure and vibration, which is suitable for high-gas and low-permeability coal seams. Background technique [0002] Coal seams contain a large amount of coalbed methane, also known as gas, which is not only a valuable resource, but also an important part of the coal and gas outburst potential in underground coal mining. Its main component is methane. my country is a country with abundant coal resources. With the rapid development of the coal industry and the sudden increase in scale, the amount of gas gushing out has increased, and the number of coal mine accidents caused by gas outbursts and explosions has risen rapidly. However, coalbed methane is a high-quality and clean fuel. If it is properly developed, recycled and utilized, it can not only reduce the occurrence of co...
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IPC IPC(8): E21B43/26E21B43/25E21F7/00
Inventor 冯立杰姜光杰陈党义李朝辉王金凤胡新平王慧智刘振锋翟雪琪邓珺邓波
Owner 河南省迪卡尔机电设备制造有限公司