CN209083324U - A kind of underground gas extraction hole doubles as the device in coal-bed flooding hole - Google Patents

Abstract

The utility model relates to a device for the underground gas drainage hole which doubles as a coal seam water injection hole. It consists of the connected branch pipe of the branch and the main pipe of the branch. Multiple branch pipes of the branch are arranged on the same side of the main pipe of the branch. The gas extraction pipe is installed in the borehole through the bag type grouting hole sealer. , or the water injection pipe is sealed and installed in the gas extraction pipe through the capsule type hole sealer; The utility model can utilize and transform conventional drainage boreholes into water-injection boreholes according to actual needs, so as to achieve high-efficiency utilization of one hole for two purposes, and utilize a branching device to perform intensive drainage-water injection for multiple boreholes, which can be optimized Drainage-water injection coupled drilling and sealing effect shortens the underground gas drainage-water injection cycle, improves the work efficiency of underground operators, and is of great significance for efficient, fast and economical underground mining.

Description

A device for underground gas drainage holes that double as coal seam water injection holes

technical field

The utility model relates to a device with underground gas drainage holes also serving as coal seam water injection holes, in particular to an intensive device that can realize simultaneous drainage and water injection of multiple boreholes.

Background technique

my country is rich in coal resources and has a wide geographical distribution, but the coal seam occurrence conditions are quite different. There are many coal seams containing gas with high gas content, and coal and gas outbursts are serious. According to the "Regulations on Compliance of Coal Mine Gas Drainage", in order to implement the gas control policy of "extracting first, then mining, monitoring and monitoring, and determining production based on wind", a gas control system of "reliable ventilation, up to standard extraction, effective monitoring, and proper management" is established. Work system, curb coal mine gas accidents, and achieve coal mine gas extraction standards. Nowadays, underground gas extraction has been normalized and universalized. In order to strengthen the effect of gas extraction and control and rationally utilize underground resources, the remaining drainage holes after gas extraction are often further rationally utilized, usually combined with the drilling water injection method. . Coal seam water injection is to inject pressurized water through drilling holes, so that it penetrates into the coal body, destroys the original coal-gas two-phase system balance in the coal body, and forms a coal-gas-water three-phase system. The physical and chemical properties, mechanical properties and thermodynamic properties of coal change. Coal seam water injection is the most fundamental and effective measure to reduce dust generation in coal mining face.

However, the existing drainage-water injection coupling methods generally construct a water injection hole on the basis of the original drainage hole, or directly use the original drainage hole. In the former, the cost of a single hole is high because the sleeve hole is easy to be deflected, and the manpower and material resources are consumed. The latter generally uses yellow mud to plug the borehole, resulting in poor borehole sealing and substandard water injection. In addition, in the process of water extraction and water injection, multiple branch pipes are generally used for gas extraction at this stage, and the pipeline is complex and difficult to maintain. In the water injection stage, single-hole single injection is used, which has a long working cycle and poor water injection effect.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a device in which the underground gas drainage hole doubles as a water injection hole in a coal seam, which can utilize and transform conventional drainage holes into water injection holes according to actual needs, and play a dual purpose of one hole. It can effectively utilize the coal mine, and can perform intensive drainage and water injection sealing for multiple boreholes, optimize the drainage and water injection drilling hole sealing effect, improve work efficiency, speed up the working cycle of underground coal mining, and reduce coal mining costs.

The technical scheme adopted by the utility model to solve the technical problem is as follows: the gas drainage pipe, the drainage hose, the water injection pipe, the tap, the trunk connecting pipe, the drainage trunk and the water injection trunk, and the tap is connected by It is composed of the tap branch pipe and the tap trunk pipe, and multiple tap branch pipes are arranged at intervals on the same side of the tap trunk pipe. The extraction pipe is installed in the borehole through the bag type grouting hole sealer, or the water injection pipe is sealed and installed in the gas extraction pipe through the capsule type hole sealer; the gas extraction pipe passes through the extraction hose and the tap. The branch pipe of the tap is connected with the branch pipe of the tap, or the water injection pipe is connected with the branch pipe of the tap through the adaptor;

Compared with the prior art, the utility model provides a device in which the underground gas drainage hole doubles as a coal seam water injection hole. The drainage hole is transformed into a water injection hole, which omits the complicated process of constructing the water injection hole or re-drilling the water injection hole, which greatly reduces the workload of the underground operators, and also reduces the underground gas drainage and coal seam water injection. cost. In addition, the gas extraction pipe is embedded with a water injection pipe, which strengthens the protection of the water injection pipe and reduces the possibility of broken rods and ruptures caused by external factors during the water injection process. In addition, the two-blocking and one-injection drainage hole sealing technology is used in combination with the capsule-sealed water injection hole sealing technology to ensure the tightness of the water injection hole, improve the shortcoming of poor sealing performance of the water injection hole, and improve the water injection efficiency. In addition, the tap system designed by the utility model can intensively connect the extraction pipeline and the water injection pipeline through hoses and taps with different performances, so that gas extraction and coal seam can be carried out to multiple boreholes at the same time. Water injection can realize the integration of rapid underground drainage and water injection, improve the work efficiency of operators, speed up the working cycle of underground coal mining, and reduce the cost of coal mining. It is of great significance to reduce the risk of downhole prominence, improve the operating environment and optimize the production structure.

Description of drawings

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 is a schematic layout diagram of an embodiment of the present invention.

Fig. 2a is a schematic diagram of the application structure of drilling holes as gas drainage holes in an embodiment of the present invention.

Figure 2b is a schematic diagram of the gas drainage hole in Figure 2a being changed to a water injection hole.

Figure 3a is a schematic diagram of the connection of the gas drainage pipeline in the embodiment of the present invention.

Figure 3b is a schematic diagram of the connection of the coal seam water injection pipeline in the embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a tap in an embodiment of the present invention.

In the picture: 1. Coal seam, 2. Drilling hole, 4. Drainage hose, 5. Splitter, 6. Main road connecting pipe, 7. Drainage main pipe, 8. Water injection main pipe, 10, Roadway, 11 , gas extraction pipe, 12, bag grouting pipe, 15, sealed capsule, 16, capsule water injection pipe, 17, water injection pipe, 18, plug, adapter 20, branch pipe of tap, 21, tap dry pipe.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments of the present invention are some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Fig. 1 to Fig. 4 are schematic structural diagrams of a preferred embodiment of the present utility model. In Fig. 1, a device in which the underground gas drainage hole doubles as a coal seam water injection hole includes a gas drainage pipe 11 and a drainage hose. , water injection pipe 17, tap 5, draining main pipe 7, trunk connecting pipe 6 and water injection main pipe 8; refer to Figure 4, the tap 5 is connected by the tap branch pipe 20 and the tap trunk pipe. 21, a plurality of tap branch pipes 20 are arranged at intervals on the same side of the tap trunk pipe 21, the number of the tap branch pipes 20 can be taken as 2-40, and the tap trunk pipe 21 is 1- 2, with valves attached to each tap branch 20 and tap main 21.

Figures 2a and 3a show pipelines for gas extraction. The gas extraction pipe 11 is installed in the borehole 2 through a pocket grouting hole sealer. The pocket grouting hole sealer includes two ends. The plugs 18 are connected with the outside of the two plugs 18 with a bag grouting pipe 12 , through which the slurry is poured into the plugs 18 through the bag grouting pipe 12 , and the slurry is finally solidified into a solid state to achieve hole sealing. The gas extraction pipe 11 is connected to the tap branch pipe 20 on the tap 5 through the tap hose 4, and the tap trunk 21 on the tap 5 is connected to the drain trunk 7 via the trunk connecting pipe 6 connected.

Figures 2b and 3b show the water injection pipeline formed on the basis of the original gas extraction borehole. The water injection pipe 17 is sealed and installed in the gas extraction pipe 11 through a capsule type hole sealer. It includes a sealing capsule 15 and a capsule water injection pipe 16 that communicates with the outside. The water injection pipe 17 is connected to the branch pipe 20 of the tap through the adapter 19; The water injection main pipe 8 is connected.

In this embodiment, the tap 5 has the ability to resist hydraulic fracturing, and the pressure it can withstand is 0-40 MPa; the extraction hose 4 has certain anti-deformation characteristics, and the larger diameter can be directly matched with the tap The branch pipe 20 is used; the water injection pipe 17 has certain pressure resistance characteristics, and can withstand a pressure of 0-40MPa, and the pipe diameter is small, and it needs to be used in conjunction with the branch pipe 20 of the tap through the adapter 19; the main road connecting pipe 6 has a certain resistance to deformation It has certain pressure resistance characteristics, and can withstand pressures of 0 to 40MPa. The interfaces of the gas extraction pipe 11 , the extraction hose 4 , the water injection pipe 17 and the trunk connecting pipe 6 are all quick joints, which can be quickly connected with the tap 5 , the extraction trunk 7 and the water injection trunk 8 .

Referring to Figures 1 to 4, a construction method using a device with an underground gas drainage hole that doubles as a coal seam water injection hole includes the following steps:

a. Use conventional methods to construct a drill hole 2 from the floor rock roadway or roof rock roadway or the coal seam roadway to the coal seam 1. After the construction of the drill hole 2, follow the conventional two-blocking and one-injection hole sealing method or the conventional bag grouting method The borehole sealing method is used to seal borehole 2. After the borehole is sealed, the gas extraction pipe 11 passes through the sealing section so that the coal seam 1 is connected to the outside world; A tap branch pipe 20 on the 5 is connected, and the tap trunk pipe 21 on the tap 5 is connected to the extraction trunk pipe 7 through the trunk connecting pipe 6, and the tap branch pipe 20 and the tap are opened. The valve on the main pipe 21 implements gas extraction;

b. Construct a group of boreholes 2 in sequence according to step a, and connect this group of boreholes 2 to the same tap 5, and implement a group of boreholes 2 to extract gas synchronously;

c. When the gas extraction effect is lost, or when the excavation head is 20-60m away from the extraction hole, close the valves on the branch pipe 20 and the main pipe 21 of the tap, and remove the gas extraction pipe 11 and the tap 5 At the same time, remove the connection between the main road connecting pipe 6 and the draining main pipe 7, and connect the main road connecting pipe 6 with the water injection main pipe 8;

d. Insert the sealing capsule 15 into the gas extraction pipe 11, the sealing capsule 15 is located in the grouting and sealing section, and inject high-pressure water into the sealing capsule 15 through the capsule water injection pipe 16 to make the sealing capsule 15 expand, and The gas extraction pipe 11 is closely attached to realize sealing, and the water injection pipe 17 is connected to the branch pipe 20 of the tap through the adapter 19;

e. Operate all drill holes 2 in a group according to step c and step d, and connect all drill holes 2 in a group with the same tap 5;

f. Open the valves on the branch pipe 20 of the tap and the main pipe 21 of the tap to realize synchronous water injection to a group of boreholes 2 .

The utility model utilizes and transforms conventional drainage boreholes into water-injection boreholes according to actual needs, so as to achieve high-efficiency utilization of one hole for two purposes, and utilizes a branching device to perform intensive drainage and water injection for a plurality of boreholes 2, thereby optimizing the The hole sealing effect of the drainage-water injection hole shortens the underground gas drainage-water injection cycle, improves the work efficiency of underground operators, and is of great significance to efficient, fast and economical underground mining.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments according to the technical essence of the present invention are fall within the protection scope of the present invention.

Claims (3)

1. a kind of underground gas extraction hole doubles as the device in coal-bed flooding hole, it is characterized in that: including gas drainage pipe (11), extraction Hose (4), water injection pipe (17), coupler (5), main line connecting tube (6), extraction main pipe (7) and water filling main pipe (8), coupler (5) It is made of the coupler branch pipe (20) and coupler main pipe (21) being connected, multiple coupler branch pipes (20), which are intervally arranged, to be tapped The same side of device main pipe (21), each coupler branch pipe (20) and coupler main pipe (21) are attached to valve；Gas drainage pipe (11) it is mounted in drilling (2) by bag type paste injection hole sealing device or water injection pipe (17) is sealed by capsule-type hole packer again It is mounted in gas drainage pipe (11)；Gas drainage pipe (11) is by the coupler branch pipe on extraction hose (4) and coupler (5) (20) it is connected or water injection pipe (17) is cooperatively connected by adapter (19) and coupler branch pipe (20)；On coupler (5) Coupler main pipe (21) is connected by main line connecting tube (6) with extraction main pipe (7) or water filling main pipe (8).

2. a kind of underground gas extraction hole according to claim 1 doubles as the device in coal-bed flooding hole, it is characterized in that: described Coupler branch pipe (20) quantity be 2-40, coupler main pipe (21) is 1-2.

3. a kind of underground gas extraction hole according to claim 1 or 2 doubles as the device in coal-bed flooding hole, it is characterized in that: The gas drainage pipe (11), extraction hose (4), water injection pipe (17) and main line connecting tube (6) interface be quick coupling.