Downward-binding type gas extraction drilling drainage device

Abstract

The utility model relates to the technical field of underground drainage of coal mines, in particular to a downward-binding type gas extraction drilling drainage device which comprises an extraction drilling hole, an extraction pipeline and a water storage bin, and the water storage bin is arranged below the extraction pipeline and communicated with the extraction pipeline. The water storage bin communicated with the extraction pipeline is additionally arranged below the extraction pipeline, accumulated water of the extraction pipeline enters the water storage bin to be collected in a centralized mode, negative pressure can be formed on the upper portion of the water storage bin when the extraction pipeline extracts gas, the accumulated water at the bottom of an extraction drill hole enters the water storage bin along the water pumping pipe, and the drainage effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine underground drainage technical field, and specifically is a kind of down type gas extraction drilling drainage device. BACKGROUND

[0002] Coal seam gas extraction drilling is divided into horizontal drilling, upward drilling and down type drilling according to different inclination directions, especially when down type gas extraction drilling, water in coal seam and roof and floor strata, water around hole wall in drilling process flows into drilling, and water is formed in drilling, if water in drilling is not discharged in time, it will affect drilling gas extraction effect, and long-term water in drilling will also cause coal seam extraction radius to reduce due to coal slime plugging hole fissure, further affect extraction effect.

[0003] At present, the commonly used down type drilling drainage in the industry is to put pressure pipe and drainage pipe into drilling, for example, the existing patent CN222558595U discloses a hole mouth management detachable downward extraction drilling drainage system, which comprises a downward drilling, a pressure pipe line, an extraction pipe line and a three-way pipe line for connecting the downward drilling, the pressure pipe line and the extraction pipe line and connected with the downward drilling, the pressure pipe line and the extraction pipe line, the first communication section of the three-way pipe line is connected with the pressure pipe and the drainage pipe, the first communication section is connected with the pressure pipe line through the pressure pipe, the pressure pipe is detachably connected with the pressure pipe line, the first communication section is connected with the extraction pipe line through the drainage pipe, and the drainage pipe is detachably connected with the extraction pipe line;The second communication section is connected with the downward drilling through two sealing and injection hole sections, and the second communication section is detachably connected with the two sealing and injection hole sections;The third communication section is connected with the extraction pipe line and detachably connected;The drainage pipe extends below the water surface in the downward drilling. The pressure pipe line is used to send pressure gas into the downward drilling, at this time, the gas in the downward drilling is above, and the water is below, under the action of the gas pressure above the water, the water is sequentially discharged through the drainage pipe and the extraction pipe line.

[0004] The above structure can realize the effect of the downward extraction drilling drainage system, but the water discharged by the drainage pipe is discharged into the extraction pipe, if the water in the extraction pipe is too much, it will affect the gas drainage effect, and the gas extraction efficiency is low, which undoubtedly increases the construction cost. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model aims at providing a down type gas extraction drilling drainage device, which can concentrate the water in the drilling, avoid too much water entering the drainage pipe, and ensure the gas drainage effect.

[0006] The technical scheme adopted by the utility model to solve its technical problems is:

[0007] The utility model provides a kind of lower type gas extraction drilling drainage device, including extraction drilling, and further including extraction pipeline and water storage warehouse, extraction pipeline is sealingly connected with extraction drilling, and the lower of extraction pipeline is provided with water storage warehouse, and water storage warehouse is communicated with extraction pipeline.

[0008] Compared with the prior art, the utility model has the beneficial effects that:

[0009] The utility model is provided with drainage port below extraction pipeline, and the accumulated water is collected and treated in water storage warehouse, so that the gas extraction efficiency is improved without affecting gas drainage effect due to excessive accumulated water in extraction pipeline.

[0010] As preferred, the further technical scheme of the utility model is:

[0011] Preferably, the bottom of the extraction pipeline is provided with a drainage port, the top of the water storage warehouse is provided with a top plate, the top plate is provided with a through hole matched with the drainage port, and the drainage port is sealingly communicated with the through hole.

[0012] Preferably, the water extraction pipe is further included, one end of the water extraction pipe extends to the bottom of the extraction drilling, and the other end of the water extraction pipe is communicated with the water storage warehouse.

[0013] Preferably, the lower end of the water extraction pipe is a closed end, and a plurality of water permeable holes are formed in the lower end side wall of the water extraction pipe.

[0014] Preferably, the extraction control valve is arranged on the extraction pipeline, and the extraction control valve is arranged at the front end of the communication position between the water storage warehouse and the extraction pipeline.

[0015] Preferably, the bottom of the water storage warehouse is provided with a water release valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings described below are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0017] Figure 1 is the structural schematic diagram of the utility model;

[0018] Marked with the following drawings: 1, extraction drilling; 2, extraction pipeline; 3, water storage warehouse; 4, drainage port; 5, top plate; 6, water release port; 7, water release valve; 8, valve; 9, water extraction pipe; 10, water permeable hole. DETAILED DESCRIPTION

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] A type of drainage device for gas extraction boreholes, such as Figure 1 As shown, it consists of a gas extraction borehole 1, a gas extraction pipeline 2, and a water storage tank 3. The gas extraction pipeline 2 is sealed to the gas extraction borehole 1. The water storage tank 3 is placed outside the gas extraction borehole 1 and below the gas extraction pipeline 2. A drain outlet 4 is provided on the pipe wall of the gas extraction pipeline 2. The top of the water storage tank 3 is sealed by a top plate 5. A through hole adapted to the drain outlet 4 is provided on the top plate 5. The drain outlet 4 is sealed to the top plate 5. When the gas extraction pipeline 2 performs gas extraction, a negative pressure is formed in the water storage tank 3.

[0021] In order to drain the water in the water storage tank 3 in a timely manner, a drain outlet 6 is provided at the bottom of the water storage tank 3. A drain valve 7 (a ball valve can be selected) is installed at the drain outlet 6 to control its opening and closing.

[0022] A valve 8 is also installed outside the extraction pipeline 2 and the extraction borehole 1. The valve 8 is used to control the opening and closing of the extraction pipeline 2 and the amount of extracted gas flow. The valve 8 is located in front of the water storage tank 3.

[0023] A pumping pipe 9 is also installed inside the pumping borehole. The lower end of the pumping pipe 9 extends to the bottom of the pumping borehole 1, and the upper end of the pumping pipe 9 extends to the outside of the pumping borehole 1 and connects to the upper part of the water storage tank 3.

[0024] In this embodiment, in order to prevent stones in the extraction borehole 1 from entering the pumping pipe 9, the lower end of the pumping pipe 9 is set as a closed end, and several permeable holes 10 are opened on the pipe wall of the lower section of the pumping pipe 9 to form a sieve section. The accumulated water enters the pumping pipe 9 along the permeable holes 10, blocking the stones outside the pipe wall and preventing the pumping pipe 9 from becoming blocked.

[0025] When the device is applied, the water collecting pipe in the extraction borehole 1 is communicated with the upper part of the water storage bin 3, and when the gas extraction pipeline 2 is used for gas extraction, negative pressure is formed in the water storage bin 3, and the accumulated water in the extraction borehole 1 is sucked into the water storage bin 3 under the action of the negative pressure. The valve 8 on the extraction pipeline 2 can adjust the negative pressure intensity in the water storage bin. When the valve 8 on the extraction pipeline 2 is closed, the entire negative pressure of the extraction pipeline 2 acts on the water pumping pipe 9, so that the drainage speed is accelerated. When the accumulated water in the extraction borehole 1 is more or the water output of the extraction borehole 1 is large, the accumulated water level is high or the accumulated water overflows the extraction borehole 1. At this time, the valve 8 on the extraction pipeline 2 can be completely opened. Since the top plate 5 of the water storage bin 3 is communicated with the extraction pipeline 2, the overflowed accumulated water or the accumulated water close to the hole of the extraction borehole 1 enters the water storage bin 3 along the extraction pipeline 2 under the action of the extraction pipeline 2, and the accumulated water is not formed in the extraction pipeline 2, thereby avoiding affecting the extraction effect.

[0026] In the embodiment, the capacity of the water storage bin 3 can be adjusted according to the water output of the extraction borehole 1, the water discharge time interval of the valve 8 and other factors, so that the accumulated water in the water storage bin 3 does not overflow from the top into the extraction pipeline when the water storage bin 3 is full.

[0027] The utility model discloses a kind of water pumping pipes and water storage bins are arranged in extraction borehole after lower type drilling construction is completed, and the water storage bin is installed in the pipeline of extraction borehole and communicated with extraction pipeline, and when extraction pipeline is used for gas extraction, negative pressure is formed in the water storage bin, so that the accumulated water in extraction borehole is collected uniformly along water pumping pipe into water storage bin, and accumulated water is not formed in extraction pipeline, ensure gas extraction effect, improve the extraction efficiency of gas.

[0028] The above-described embodiments enable those skilled in the art to implement or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A downhole gas extraction borehole drainage device comprising an extraction borehole, characterised in that: The water storage bin is in communication with the extraction pipeline.

2. The downwardly penetrating gas extraction borehole drainage device according to claim 1, characterized in that: The bottom of the extraction pipeline is provided with a water outlet, and the top of the water storage bin is provided with a top plate.

3. The downwardly penetrating gas extraction borehole drainage device according to claim 2, characterized in that: The water extraction pipe extends to the bottom of the extraction borehole at one end, and is in communication with the water storage bin at the other end.

4. The downwardly penetrating gas extraction borehole drainage device according to claim 3, characterized in that: The lower end of the water extraction pipe is a closed end, and a plurality of water-permeable holes are formed in the sidewall of the lower end of the water extraction pipe.

5. The downwardly penetrating gas extraction borehole drainage device according to claim 3, characterized in that: An extraction control valve is arranged on the extraction pipeline.

6. The downwardly penetrating gas extraction borehole drainage device of claim 1, wherein: The bottom of the water storage bin is provided with a water release valve.

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