Method for pumping and draining coalbed methane
A technology for coal bed methane and coal seam, applied in the field of gas mining, can solve problems such as large drilling workload, and achieve the effects of improving efficiency, saving costs and reducing water seals
Inactive Publication Date: 2019-03-08
CHINA SHENHUA ENERGY CO LTD +1
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] The main purpose of the present invention is to provide a method for pumping coalbed methane, so as to solve the problem of large drilling workload in branch wells with nearly parallel directions in the prior art
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0024] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0025] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0026] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects, ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for pumping and draining coalbed methane. The method comprises the steps that main coal mining roadways are established in a coal mining area, mine tunnel horizontal well heads are formed in the upper part of a target driving coal seam, and mine tunnel horizontal wells are excavated along the coal seam by using a drilling tool at the mine tunnel horizontal well heads; when the length of the mine tunnel horizontal wells reaches a preset length, the drilling tool is dragged back to form horizontal multilateral wells above the mine tunnel horizontal wells in the mode of opposite to the dip direction and close to the vertical direction, and the horizontal multilateral wells have included angles with the mine tunnel horizontal wells; and the coalbed methane enters the mine tunnel horizontal wells through the horizontal multilateral wells opposite to the dip direction and close to the vertical direction to be drained. The pumping and draining of the coalbed methane are performed on the coal seam by the method, dirt bands of the coal seam can be drilled through the horizontal multilateral wells opposite to the dip direction and close to the vertical direction to reduce the water seal during the pumping and draining, the efficiency of pumping and draining the coalbed methane is effectively improved, and thus the cost of pumping and draining the coalbed methane is saved.
Description
technical field [0001] The invention relates to the technical field of coal gas exploitation, in particular to a method for extracting coalbed methane. Background technique [0002] At present, the method adopted by coal mines to implement horizontal branch shafts in main roads to realize coalbed methane drainage is that the branch shafts run in nearly parallel directions. This method has the following disadvantages: [0003] 1. All the near-parallel branch horizontal wells cannot penetrate all gangue in the coal seam. [0004] 2. The drilling workload of branch wells with near-parallel trend is heavy. [0005] 3. Since the branch wells with nearly parallel directions can only penetrate part of the coal seam, the coalbed methane in the same coal seam cannot be effectively pumped. [0006] 4. Increase the project cost and increase the construction period. [0007] 5. Increase the pumping time. Contents of the invention [0008] The main purpose of the present invention...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 向军文吴联君
Owner CHINA SHENHUA ENERGY CO LTD