Method and system for the simultaneous mining of coal and natural gas

Abstract

The application provides a coal and natural gas cooperative mining method and a mining system, and the method comprises the following steps: arranging a natural gas collecting chamber in a stable rock layer below a coal seam, arranging a natural gas collecting device in the natural gas collecting chamber, and pumping natural gas in a gas layer below the rock layer; and conveying the pumped natural gas to the ground through a gas pipeline, wherein the gas pipeline is arranged in the natural gas collecting chamber, a coal mining roadway and a auxiliary shaft in sequence, and a wellhead of the auxiliary shaft is arranged above the ground. The natural gas collecting chamber is arranged in the stable rock layer below the coal seam, the natural gas collecting device is arranged in the natural gas collecting chamber, and the natural gas in the gas layer below the rock layer is pumped, so that the natural gas well does not need to pass through the coal seam, the problem of well killing of natural gas in the process of cooperative mining of coal and natural gas can be effectively avoided, and the influence of mining and the influence of overburden rock fracture on the natural gas well caused by the coal seam mining can be reduced.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and more specifically, to a method and system for the coordinated mining of coal and natural gas. Background Technology

[0002] Coal and natural gas are both conventional energy sources that affect the national economy and people's livelihood. In the process of coal and natural gas mining, it is often found that coal resources and natural gas resources overlap. The mining of large amounts of coal and natural gas resources that overlap may affect each other.

[0003] In traditional coal and natural gas co-mining schemes, natural gas wells are located on the surface. To protect the gas wells, protective coal pillars need to be left, resulting in the loss of coal resources. Furthermore, when drilling natural gas wells, the wells inevitably pass through coal seams. Due to the impact of mining, there will be a large number of overburden fissures, which will cause difficulties such as leakage and blockage during the drilling process, which is labor-intensive and time-consuming. At the same time, leakage and blockage may also occur during the drilling process.

[0004] Therefore, existing technologies present a technical problem where coal and natural gas resources cannot be mined in a coordinated manner when they overlap. Summary of the Invention

[0005] The main objective of this invention is to provide a method and system for the coordinated mining of coal and natural gas, in order to solve the technical problem that the coal and natural gas resources cannot be coordinated in the case of overlapping resources in the prior art.

[0006] To achieve the above objectives, according to one aspect of the present invention, a method for the coordinated mining of coal and natural gas is provided, comprising setting up a natural gas extraction chamber in a stable rock stratum below the coal seam, and installing natural gas extraction equipment in the natural gas extraction chamber to extract natural gas from a gas layer located below the rock stratum; and transporting the extracted natural gas to the surface through a gas pipeline, wherein the gas pipeline is sequentially arranged in the natural gas extraction chamber, in the main coal mining roadway, and in the auxiliary shaft, and the wellhead of the auxiliary shaft is located above the surface.

[0007] Furthermore, the establishment of a natural gas collection chamber in a stable rock stratum below the coal seam includes: after the main coal mining roadway is excavated, excavating the natural gas collection chamber in a stable rock stratum below the main coal mining roadway and located below the coal seam.

[0008] Furthermore, the extraction of natural gas from the gas layer located below the rock strata includes: drilling a natural gas well connected to the gas layer in the natural gas extraction chamber; and extracting the natural gas through the natural gas well using the natural gas extraction equipment.

[0009] Furthermore, the method also includes: arranging the gas transmission pipeline in the corresponding coal mining main roadway according to the layout conditions of the coal mine roadway, wherein the coal mining main roadway includes at least an auxiliary transport roadway, a return air roadway, and a transport roadway.

[0010] Furthermore, the method also includes: arranging the natural gas extraction chamber in the goaf of the mined coal seam or in a stable rock stratum at the same level as the coal seam, based on the spatial location and stability of the coal seam and the rock stratum.

[0011] Furthermore, the mining areas of the coal seam and the natural gas wells are staggered.

[0012] Furthermore, the method also includes: setting up a gas transmission pipe tray in the main coal mining roadway, fixing the gas transmission pipe on the gas transmission pipe tray; and fixing the gas transmission pipe to the wall of the auxiliary shaft.

[0013] Furthermore, the extraction pipeline connected to the natural gas extraction equipment extends horizontally within the gas layer.

[0014] Furthermore, the method also includes connecting the gas pipeline in the auxiliary well to an oil and gas station located on the ground via a surface gas pipeline.

[0015] According to another aspect of the present invention, a coal and natural gas co-mining system is provided, comprising: a natural gas extraction chamber disposed in a stable rock stratum below a coal seam; a natural gas extraction device disposed in the natural gas extraction chamber for extracting natural gas from a gas layer located below the rock stratum; and a gas transmission pipeline connected to the natural gas extraction device for transporting the extracted natural gas to the surface, wherein the gas transmission pipeline is sequentially arranged in the natural gas extraction chamber, in the main coal mining roadway, and in the auxiliary shaft, and the wellhead of the auxiliary shaft is disposed above the surface.

[0016] The coal and natural gas co-mining method provided by this invention involves setting up a natural gas extraction chamber in a stable rock stratum beneath the coal seam and installing natural gas extraction equipment within the chamber to extract natural gas from the gas layer located beneath the rock stratum. Since the natural gas well does not need to penetrate the coal seam, the problem of natural gas well kill during coal and natural gas co-mining can be effectively avoided, reducing the impact of coal seam mining and the influence of overburden fractures on the natural gas well. By using gas pipelines arranged sequentially in the natural gas extraction chamber, the main coal mining roadway, and the auxiliary shaft with the wellhead located above the ground to transport natural gas to the ground surface, the existing coal mining equipment can be reused, effectively saving mining costs and improving resource production efficiency. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structural layout of a coal and natural gas co-mining system according to the present invention is shown;

[0019] Figure 2 A schematic diagram of the ground layout of the coal and natural gas co-mining system according to the present invention is shown;

[0020] Figure 3 A schematic diagram of the auxiliary transport roadway gas pipeline layout of the coal and natural gas co-mining system according to the present invention is shown;

[0021] Figure 4 A schematic diagram of the auxiliary well gas pipeline layout of the coal and natural gas co-mining system according to the present invention is shown.

[0022] The above figures include the following reference numerals:

[0023] 1. Coal seam; 2. Rock strata; 3. Gas layer; 4. Acquisition chamber; 5. Natural gas acquisition equipment; 6. Gas pipeline; 7. Auxiliary shaft; 8. Oil and gas station; 9. Auxiliary transport roadway; 10. Gas pipeline tray; 11. Surface gas pipeline. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0027] To address the technical problem of the inability to coordinate the mining of coal and natural gas resources when they overlap in existing technologies, this invention provides a method and system for the coordinated mining of coal and natural gas.

[0028] like Figures 1 to 4As shown, the method for co-mining coal and natural gas provided by the present invention includes setting up a natural gas extraction chamber 4 in a stable rock stratum below coal seam 1, and installing a natural gas extraction device 5 in the natural gas extraction chamber 4 to extract natural gas from a gas layer 3 located below rock stratum 2. In this way, the natural gas well is located below coal seam 1, and the natural gas extraction process will not affect coal seam 1. The extracted natural gas is transported to the surface through a gas pipeline 6, wherein the gas pipeline 6 is arranged sequentially in the natural gas extraction chamber 4, in the main coal mining roadway, and in the auxiliary shaft 7, and the wellhead of the auxiliary shaft 7 is located above the surface.

[0029] The coal and natural gas co-mining method provided by this invention involves setting up a natural gas extraction chamber 4 in a stable rock stratum below coal seam 1 and installing natural gas extraction equipment 5 inside the natural gas extraction chamber 4 to extract natural gas from the gas layer 3 located below rock stratum 2. Since the natural gas well does not need to penetrate coal seam 1, the problem of natural gas well kill during coal and natural gas co-mining can be effectively avoided, reducing the impact of mining on coal seam 1 and the impact of overburden fractures on the natural gas well. By using gas pipelines 6 arranged sequentially in the natural gas extraction chamber 4, in the main coal mining roadway, and in the auxiliary shaft 7 located above the ground, natural gas is transported to the ground surface, realizing the secondary utilization of existing coal mining equipment, effectively saving mining costs, and improving resource production efficiency.

[0030] Furthermore, the establishment of the natural gas collection chamber 4 in the stable rock strata below the coal seam 1 includes: after the main coal mining roadway is excavated, excavating the natural gas collection chamber 4 in the stable rock strata below the main coal mining roadway and located below the coal seam 1. Specifically, a stable rock stratum is selected to ensure that the collection chamber 4 after extraction can withstand the vibrations generated during natural gas extraction, and at the same time, to ensure long-term use. The collection chamber 4 needs to be able to accommodate the natural gas collection equipment 5. For example, the natural gas collection chamber 4 can be 10m long and wide and 13m high. The natural gas extraction equipment adopts the XSL7 / 360 deep hole drilling rig.

[0031] The extraction of natural gas from the gas layer 3 located below the rock stratum 2 includes: drilling a natural gas well connected to the gas layer 3 within the natural gas extraction chamber 4; and extracting the natural gas through the natural gas extraction equipment 5 via the natural gas well. Specifically, as... Figure 1 As shown, natural gas well drilling is carried out in the collection chamber 4, and natural gas is extracted from the natural gas layer 3 using a small natural gas collection device 5. The extracted natural gas is transported to the surface through the gas pipeline 6.

[0032] In one specific embodiment of this application, the method further includes: arranging the gas transmission pipeline 6 in the corresponding coal mining main roadway according to the layout conditions of the coal mine roadways, wherein the coal mining main roadway includes at least an auxiliary haulage main roadway 9, a return air main roadway, and a haulage main roadway. Specifically, the natural gas collected by the extraction equipment needs to be transported through the coal seam 1 to the surface oil and gas station 8. Based on the layout of the coal mine roadways during coal mining, the gas transmission pipeline 6 can be arranged in the auxiliary haulage main roadway 9, the return air main roadway, and the haulage main roadway, thereby avoiding the need for drilling again to lay the transmission pipeline; only the natural gas pipeline needs to be fixed, thus saving mining costs.

[0033] Furthermore, the method also includes: arranging the natural gas extraction chamber 4 in the goaf of the mined coal seam 1 or in a stable rock stratum at the same level as the coal seam 1, based on the spatial location and stability of the coal seam 1 and the rock stratum 2. This arrangement can make full use of existing resources, avoid the cost of further excavation, and reduce the risks that may arise during the excavation process. At the same time, arranging the extraction chamber 4 in a stable rock stratum at the same level as the coal seam 1 and less affected by mining can balance mining costs and mining impact.

[0034] To further reduce the mutual influence during coal and natural gas mining, the mining area of ​​the coal seam 1 and the natural gas well can be staggered, and the chamber is located below the non-mining area of ​​the coal seam 1 to avoid potential mutual influence during coal and natural gas mining.

[0035] To secure the gas pipeline 6, the method further includes installing a gas pipeline tray 10 within the main coal mining roadway and fixing the gas pipeline 6 to the tray 10; and fixing the gas pipeline 6 to the wall of the auxiliary shaft 7, which is relative to the main shaft and is primarily used for hoisting and lowering personnel, materials, and waste rock during underground mining operations. This structural design avoids the gas pipeline 6 from affecting the operation of the main coal mining roadway and the auxiliary shaft 7, and also facilitates subsequent pipeline maintenance.

[0036] Furthermore, the extraction pipeline connected to the natural gas extraction equipment extends horizontally within the gas layer 3. This arrangement facilitates full contact between the natural gas extraction equipment and the gas layer 3, as well as the addition or removal of natural gas extraction equipment located in the natural gas layer 3 in the future.

[0037] In one specific embodiment of this application, the method further includes connecting the gas pipeline 6 in the auxiliary well 7 to the oil and gas station 8 located on the ground via a surface gas pipeline 6. Connecting the surface gas pipeline 6 to the oil and gas station 8 reduces the length of the gas pipeline 6 underground, which can effectively reduce pipeline laying costs and facilitate subsequent pipeline inspection.

[0038] The following explains the technical terms used in this application:

[0039] Underground chambers refer to structures that are artificially excavated or naturally existing in underground rock and soil masses for various purposes. They are classified according to their uses as follows: mine shafts (vertical shafts, inclined shafts, roadways), traffic tunnels, hydraulic tunnels, underground factories and warehouses, underground military engineering, etc.

[0040] Auxiliary transport roadways: including stage roadways, horizontal roadways and main horizontal roadways, are excavated along the coal seam below the stage roadway, and are responsible for transporting materials and personnel, as well as ventilation, drainage, laying pipelines, etc., serving the stage and level roadways.

[0041] Mining impacts: Mining impacts are the collective term for the displacement and deformation of the surrounding rock roof, surface, floor, and the mined stratum itself caused by large-scale mining in underground mining projects, as well as the various damages they cause.

[0042] Overburden fissures: Overburden fissures refer to rock fissures that are porous and have contractile properties, formed along geological structural planes within the overburden strata.

[0043] According to another aspect of the present invention, a coal and natural gas co-mining system is provided, comprising a natural gas extraction chamber 4, a natural gas extraction device 5, and a gas transmission pipeline 6, wherein the natural gas extraction chamber 4 is disposed in a stable rock stratum below a coal seam 1; the natural gas extraction device 5 is disposed in the natural gas extraction chamber 4 for extracting natural gas from a gas layer 3 located below a rock stratum 2; the gas transmission pipeline 6 is connected to the natural gas extraction device 5 for transporting the extracted natural gas to the surface, wherein the gas transmission pipeline 6 is sequentially arranged in the natural gas extraction chamber 4, in the main coal mining roadway, and in an auxiliary shaft 7, the wellhead of the auxiliary shaft 7 being disposed above the surface.

[0044] The coal and natural gas co-mining system provided by this invention places the natural gas collection chamber 4 in a stable rock stratum below the coal seam 1, and the natural gas collection equipment 5 inside the natural gas collection chamber 4. This effectively avoids the impact of natural gas collection on the coal seam 1, and also avoids the problem of coal well pressure during the co-mining of coal and natural gas. It also reduces the impact of mining on the coal seam 1 and the impact of overburden fissures on the natural gas well. By sequentially arranging the gas pipeline 6 inside the natural gas collection chamber 4, the main coal mining roadway, and the auxiliary shaft 7, and transporting the natural gas to the oil and gas station 8 through the surface gas pipeline 6, the cost of natural gas extraction can be further reduced, and the subsequent maintenance of the pipeline can be facilitated.

[0045] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0046] 1. Effectively solves the technical problem of the inability to coordinate mining when coal and natural gas resources overlap in existing technologies;

[0047] 2. It enables the secondary use of existing coal mining equipment, effectively saving mining costs and improving resource production efficiency.

[0048] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for the co-mining of coal and natural gas, characterized in that, include: A natural gas extraction chamber (4) is set up in the stable rock strata below the coal seam (1), and a natural gas extraction device (5) is set up in the natural gas extraction chamber (4) to extract natural gas from the gas layer (3) located below the rock strata (2); The extracted natural gas is transported to the ground through a gas pipeline (6), wherein the gas pipeline (6) is arranged sequentially in the natural gas collection chamber (4), the coal mining roadway and the auxiliary shaft (7), and the wellhead of the auxiliary shaft (7) is located above the ground. The extraction of natural gas from the gas layer (3) located below the rock layer (2) includes: Drill a natural gas well connected to the gas layer (3) inside the natural gas collection chamber (4); The natural gas is extracted from the natural gas well via the natural gas extraction device (5).

2. The method for co-mining coal and natural gas according to claim 1, characterized in that, The establishment of a natural gas extraction chamber (4) in a stable rock stratum below the coal seam (1) includes: After the main coal mining roadway is excavated, the natural gas extraction chamber (4) is excavated in the stable rock strata below the main coal mining roadway and below the coal seam (1).

3. The method for co-mining coal and natural gas according to claim 1, characterized in that, The method further includes: According to the layout conditions of the coal mine roadways, the gas transmission pipeline (6) is arranged in the corresponding coal mining roadway, wherein the coal mining roadway includes at least the auxiliary transport roadway (9), the return air roadway and the transport roadway.

4. The method for co-mining coal and natural gas according to claim 1, characterized in that, The mining area of ​​the coal seam (1) and the natural gas well are staggered.

5. The method for co-mining coal and natural gas according to claim 1, characterized in that, The method further includes: setting up a gas pipeline tray (10) in the coal mining roadway and fixing the gas pipeline (6) on the gas pipeline tray (10); The gas pipeline (6) is fixed to the well wall of the auxiliary well (7).

6. The method for co-mining coal and natural gas according to claim 1, characterized in that, The extraction pipeline connected to the natural gas extraction equipment extends horizontally within the gas layer (3).

7. The method for co-mining coal and natural gas according to claim 1, characterized in that, The method further includes: The gas pipeline (6) in the auxiliary well (7) is connected to the oil and gas station (8) located on the ground via the surface gas pipeline (6).

8. A system for the coordinated mining of coal and natural gas, characterized in that, include: The natural gas extraction chamber (4) is located in a stable rock stratum below the coal seam (1); Natural gas extraction equipment (5) is installed in natural gas extraction chamber (4) and is used to extract natural gas from gas layer (3) located below rock layer (2); A gas pipeline (6) is connected to the natural gas collection equipment (5) and is used to transport the extracted natural gas to the ground. The gas pipeline (6) is arranged in sequence in the natural gas collection chamber (4), the coal mining roadway and the auxiliary shaft (7). The wellhead of the auxiliary shaft (7) is located above the ground. The extraction of natural gas from the gas layer (3) located below the rock layer (2) includes: Drill a natural gas well connected to the gas layer (3) inside the natural gas collection chamber (4); The natural gas is extracted from the natural gas well via the natural gas extraction device (5).

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