Downward extraction drilling drainage system with detachable orifice pipeline

Abstract

The utility model relates to a downward extraction drilling drainage system with a detachable orifice pipeline, and belongs to the technical field of coal mine gas extraction. Comprising a detachable three-way pipeline, the three-way pipeline is communicated with a pressure ventilation pipeline, an extraction pipeline and a downward drill hole, the three-way pipeline is provided with a pressure ventilation pipe and a drainage pipe, an extraction hose and a three-way valve are arranged on the extraction pipeline, and a hole sealing sleeve is arranged at an orifice of the downward drill hole; the pressure ventilation pipe is communicated with the pressure ventilation pipeline and the hole sealing sleeve, the drainage pipe is communicated with the extraction pipeline and the hole sealing sleeve, and the extraction hose is communicated with the hole sealing sleeve through the three-way pipeline. When drill hole drainage is needed, pressure gas is fed into the drill hole through the pressure ventilation pipeline, and accumulated water in the drill hole flows into the extraction pipeline through the drainage pipe under the action of air pressure and is discharged out of the drill hole. During gas extraction, the three-way pipeline can be detached, the extraction hose and the hole sealing sleeve are connected, and gas extraction is achieved. The device can be detached and reused, and the problems that downward drilling drainage is difficult, the extraction effect is poor, and cost is high are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine gas extraction, and relates to a downward extraction drilling drainage system with a detachable orifice pipeline. Background Art

[0002] During coal mining, gas problems seriously affect the safe production of mines. Usually, the gas content in the mine is reduced by drilling and extracting gas to reduce gas outburst during coal mining.

[0003] Gas extraction drilling holes can generally be divided into upward drilling holes and downward drilling holes. Among them, upward drilling holes are easy to operate in terms of drilling hole sealing and drainage, and have significant effects. They have advantages and are widely used. However, due to unfavorable factors such as difficult drainage of downward drilling holes, poor extraction effects, complex orifice devices, and high costs, downward drilling extraction has not been widely used for a long time.

[0004] Compared with upward drilling, downward drilling also has certain advantages: first, the trajectory of downward drilling is easier to control, so that the drilling can reach the predetermined target area more accurately, which is conducive to improving the extraction effect; second, the gas extraction efficiency is higher. Since the gas density is smaller than that of air, the gas can easily migrate from the bottom of the borehole to the top of the borehole, which is conducive to improving the gas extraction efficiency; third, the application scope of extraction drilling is expanded, which is suitable for various coal seam thicknesses and coal seam inclinations.

[0005] According to the requirements of the "Detailed Rules for Preventing and Controlling Coal and Gas Outbursts", drainage measures need to be taken when the inclination of the downward borehole exceeds 25° to ensure the extraction effect. The current technical methods for drainage of downward boreholes in the industry are mainly as follows: After the downward drilling construction is completed, a prefabricated drainage pipeline and a compressed air pipeline are placed in the borehole during the sealing and extraction operation. Then, when the hole mouth is closed, pressurized gas is continuously sent into the borehole through the compressed air pipeline. At this time, the air in the borehole is on the top and the water is on the bottom. The accumulated water in the hole will flow out of the hole along the drainage pipeline under the action of the air pressure. This method can solve the drainage problem of downward drilling, but the device cannot be disassembled, and each borehole needs to be equipped with a fixed drainage device, which cannot be reused, which undoubtedly increases the construction cost.

[0006] In order to solve the problems existing in the above-mentioned technologies, it is urgently necessary to propose a downward extraction drilling drainage system which is easy to operate, low in cost, has a significant extraction effect, and has a detachable and reusable orifice pipeline. Utility Model Content

[0007] In view of this, the purpose of the utility model is to provide a downward extraction drilling drainage system with a detachable orifice pipeline, which has a simple structure and can be disassembled and reused, thereby solving the problems of difficult downward drilling drainage, poor extraction effect and high cost.

[0008] In order to achieve the above object, the utility model provides the following technical solutions:

[0009] A downward extraction borehole drainage system with a detachable orifice pipeline, comprising a downward borehole, a compressed air pipeline and a drainage pipeline, and also comprising a three-way pipeline for connecting the downward borehole, the compressed air pipeline and the drainage pipeline and detachably connected to the downward borehole, the compressed air pipeline and the drainage pipeline, the three-way pipeline comprising a first connecting section, a second connecting section and a third connecting section which are connected at one end; a compressed air pipe and a drainage pipe are passed through the first connecting section, the first connecting section is connected to the compressed air pipeline through the compressed air pipe, the compressed air pipe and the compressed air pipeline are detachably connected, the first connecting section is connected to the drainage pipeline through the drainage pipe, and the drainage pipe and the drainage pipeline are detachably connected; the second connecting section is connected to the downward borehole through a two-blocking and one-injection sealing section, the second connecting section is detachably connected to the two-blocking and one-injection sealing section; the third connecting section is connected to the drainage pipeline and is detachably connected; the drainage pipe extends below the water surface in the downward borehole.

[0010] Optionally, the compressed air pipe and the drain pipe are fixed in the first connecting section via a sealing structure; the compressed air pipe is connected to the compressed air pipeline via a compressed air hose, and the drain pipe is connected to the extraction pipeline via a drain hose.

[0011] Optionally, the compressed air pipeline is detachably connected to the compressed air hose via a first joint, and a first valve is provided at one end of the compressed air pipeline close to the first joint; a second valve is provided at one end of the compressed air pipe close to the compressed air hose.

[0012] Optionally, a sieve hole section is provided at one end of the drainage pipe close to the downward drilled hole.

[0013] Optionally, the compressed air pipe and the drainage pipe are both four-branch pipes.

[0014] Optionally, the sealing structure is fixed to the first connecting section by means of a threaded connection.

[0015] Optionally, the two-blocking and one-injection sealing section includes a sealing casing and a sealing ring for fixing the sealing casing in the downward borehole; the end of the sealing casing away from the downward borehole is detachably connected to the second connecting section via a second joint.

[0016] Optionally, a three-way valve is provided on the extraction pipeline, and the three-way valve is respectively connected to the drainage hose, the extraction pipeline and the extraction hose, the three-way valve and the drainage hose are detachably connected via a third joint, the three-way valve and the extraction hose are connected via a first pipe clamp, and the extraction hose is detachably connected to the third connecting section via a second pipe clamp.

[0017] Optionally, a third valve is provided at one end of the three-way valve close to the third joint, and a fourth valve is provided at one end close to the first pipe clamp.

[0018] Optionally, when the three-way pipeline is removed, the extraction pipeline is connected to the downward borehole to achieve gas extraction.

[0019] The beneficial effects of the utility model are:

[0020] (1) The three-way pipe of the utility model can be disassembled and reused. After the drainage of one downward borehole is completed, the three-way pipe can be directly installed in the next downward borehole for drainage. On the one hand, the complexity of the underground drainage pipe network is simplified, which is convenient for on-site management, and on the other hand, the cost is reduced;

[0021] (2) The first joint and the third joint are both detachable and reusable pneumatic quick joints; the second joint is a detachable tightening nut quick joint, which makes the disassembly and connection of the three-way pipeline simple and reliable;

[0022] (3) The utility model proposes a downward extraction borehole drainage system with a detachable and reusable orifice pipe, which is not only suitable for drainage of newly constructed downward boreholes, but is also particularly suitable for drainage of existing downward boreholes that have been sealed but without pre-buried drainage pipes. It has great market prospects and application value.

[0023] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the pipe connection method in the drainage state of the utility model;

[0026] Figure 2 It is a schematic diagram of pipeline connection in the extraction state of the utility model.

[0027] Reference numerals:

[0028] 1 downward drilling, 11 two-blocking and one-injection sealing section, 111 sealing casing, 112 sealing ring, 12 second joint, 13 accumulated water, 14 accumulated slag, 2 compressed air pipeline, 21 first joint, 22 first valve, 3 extraction pipeline, 31 three-way valve, 32 extraction hose, 33 third joint, 34 first pipe clamp, 35 second pipe clamp, 36 third valve, 37 fourth valve, 4 three-way pipeline, 41 first connecting section, 411 compressed air pipe, 412 compressed air hose, 4121 second valve, 413 drainage pipe, 4131 sieve hole section, 414 drainage hose, 415 sealing structure, 42 second connecting section, 43 third connecting section. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0030] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] See also Figure 1-2, is a downward extraction borehole drainage system with a detachable orifice pipeline, comprising a downward borehole 1, a compressed air pipeline 2 and an extraction pipeline 3, and also comprising a three-way pipeline 4 for connecting the downward borehole 1, the compressed air pipeline 2 and the extraction pipeline 3 and detachably connected to the downward borehole 1, the compressed air pipeline 2 and the extraction pipeline 3, the three-way pipeline 4 comprising a first connecting section 41, a second connecting section 42 and a third connecting section 43 connected at one end; a compressed air pipe 411 and a drainage pipe 413 are passed into the first connecting section 41, and the first connecting section 41 passes through the compressed air pipe 41 1 is connected to the compressed air pipeline 2, the compressed air pipe 411 is detachably connected to the compressed air pipeline 2, the first connecting section 41 is connected to the extraction pipeline 3 through the drain pipe 413, the drain pipe 413 is detachably connected to the extraction pipeline 3; the second connecting section 42 is connected to the downward borehole 1 through the two-blocking and one-injection sealing section 11, the second connecting section 42 is detachably connected to the two-blocking and one-injection sealing section 11; the third connecting section 43 is connected to the extraction pipeline 3 and detachably connected; the drain pipe 413 extends below the surface of the accumulated water 13 in the downward borehole 1. Pressurized gas is sent downward into the borehole 1 through the compressed air pipeline 2. At this time, the gas in the downward borehole 1 is at the top and the accumulated water 13 is at the bottom. Under the action of the gas pressure from the top, the accumulated water 13 is discharged through the drain pipe 413 and the extraction pipeline 3 in sequence. Under normal circumstances, the pressure of the compressed air pipeline 2 in the mine is generally 0.5-0.7 MPa, which can theoretically raise the surface of the water 13 in the hole by 50-70 m. When the gas pressure in the hole is insufficient, a gas booster pump can be installed between the compressed air pipeline 2 and the downward borehole 1 to increase the pressure.

[0033] The compressed air pipe 411 and the drain pipe 413 are fixed in the first connecting section 41 through the sealing structure 415; the compressed air pipe 411 is connected to the compressed air pipeline 2 through the compressed air hose 412, and the drain pipe 413 is connected to the extraction pipeline 3 through the drain hose 414. The sealing structure 415 is used to fix the compressed air pipe 411 and the drain pipe 413 on the one hand, and to seal the three-way pipeline 4 and the downward borehole 1 on the other hand to prevent gas leakage.

[0034] The compressed air pipeline 2 is detachably connected to the compressed air hose 412 through the first joint 21. A first valve 22 is provided at one end of the compressed air pipeline 2 close to the first joint 21; a second valve 4121 is provided at one end of the compressed air pipe 411 close to the compressed air hose 412. The opening and closing of the valve controls the opening and closing of the corresponding pipeline.

[0035] A sieve hole section 4131 is provided at one end of the drainage pipe 413 close to the downward borehole 1. The function of the sieve hole section 4131 is to screen out the soil and accumulated slag 14 in the downward borehole 1 to prevent the pipe from being blocked.

[0036] The compressed air pipe 411 and the drain pipe 413 are both divided into four branches.

[0037] The sealing structure 415 is fixed to the first connecting section 41 by means of threaded connection.

[0038] The two-blocking and one-injection sealing section 11 includes a sealing sleeve 111 and a sealing ring 112 for fixing the sealing sleeve 111 in the downward borehole 1; the end of the sealing sleeve 111 away from the downward borehole 1 is detachably connected to the second connecting section 42 through a second joint 12.

[0039] A three-way valve 31 is provided on the extraction pipeline 3, and the three-way valve 31 is connected to the drainage hose 414, the extraction pipeline 3 and the extraction hose 32 respectively. The three-way valve 31 and the drainage hose 414 are detachably connected through the third joint 33, and the three-way valve 31 and the extraction hose 32 are connected through the first pipe clamp 34, and the extraction hose 32 is detachably connected to the third connecting section 43 through the second pipe clamp 35. In some embodiments of the utility model, the extraction hose 32 adopts a steel wire hose, and can be replaced with a hose of other materials that is convenient for implementation during on-site implementation.

[0040] A third valve 36 is disposed at one end of the three-way valve 31 close to the third joint 33 , and a fourth valve 37 is disposed at one end of the three-way valve 31 close to the first pipe clamp 34 .

[0041] When the three-way pipeline 4 is removed, the extraction pipeline 3 is connected to the downward borehole 1 to realize gas extraction. At this time, the connection between the extraction pipeline 3 and the downward borehole 1 is achieved by connecting the extraction hose 32 with the sealing casing 111. The second pipe clamp 35 on one side of the extraction hose 32 is connected to the second joint 12 on one side of the sealing casing 111.

[0042] like Figure 1 The example 1 is shown, and the downward extraction drilling drainage system is in the drainage state:

[0043] During the gas extraction process, water in the coal and rock layers around the downward borehole 1 will gradually enter the downward borehole 1 under the effect of the extraction negative pressure, and gradually gather from the bottom of the downward borehole 1. The water 13 inside the downward borehole 1 will become more and more, resulting in the inability of the extraction negative pressure to act on the hole wall, so that the gas in the coal body is not affected by the negative pressure, resulting in a significant decrease in the extraction effect. Therefore, when there is a lot of water 13 in the borehole, drainage should be carried out to reduce or eliminate the water 13 in the borehole to ensure the extraction effect.

[0044] When the downward borehole 1 needs to be drained, close the fourth valve 37, disassemble the second pipe clamp 35, and then install the three-way pipeline 4; connect the compressed air hose 412 to the compressed air pipeline 2 through the first joint 21, connect the sealing sleeve 111 to the second connecting section 42 of the three-way pipeline 4 through the second joint 12, connect the drainage hose 414 to the three-way valve 31 through the third joint 33, and connect the extraction hose 32 to the third connecting section 43 of the three-way pipeline 4 through the second pipe clamp 35.

[0045] Open the first valve 22, the second valve 4121, and the third valve 36, so that the compressed air passes through the compressed air pipeline 2, the first valve 22, the first joint 21, the second valve 4121, the compressed air hose 412, and the compressed air pipe 411 in sequence to enter the downward borehole 1, so that a positive gas pressure is generated in the borehole. The positive gas pressure acts on the surface of the accumulated water 13, compressing the accumulated water 13 to the bottom of the borehole. The accumulated water 13 then enters the drain pipe 413 through the sieve section 4131 at the bottom of the hole, and enters the extraction pipeline 3 through the drain hose 414, the third joint 33, the third valve 36, and the three-way valve 31 in sequence to be discharged from the borehole.

[0046] The drainage hose 414 is translucent. After the water 13 in the borehole is drained by observing the water flow in the drainage hose 414, the fourth valve 37 is opened, the first valve 22, the second valve 4121, and the third valve 36 are closed, and then the first joint 21, the second joint 12, the third joint 33, and the second pipe clamp 35 are disassembled, and the reusable three-way pipeline 4 is removed from the orifice. After the disassembly is completed, the extraction hose 32 is connected to the second joint 12 on the sealing casing 111 through the second pipe clamp 35, and then the fourth valve 37 is opened to restore the gas extraction state. In this way, the drainage operation is performed on each other borehole.

[0047] like Figure 2 This is Example 2. At this time, the downward drainage drilling system is in a normal gas extraction state:

[0048] During normal gas extraction, the third valve 36 is closed and the fourth valve 37 is opened. The gas in the downward borehole 1 enters the extraction pipeline 3 through the sealing casing 111, the extraction hose 32, the fourth valve 37, and the three-way valve 31 in sequence, and is extracted to the ground through the extraction pipeline 3 for gas utilization.

[0049] Embodiment 3 is the gas extraction state when the three-way pipeline 4 is not disassembled:

[0050] In this state, the three-way pipeline 4 remains connected to the compressed air pipeline 2, the extraction pipeline 3, and the sealing casing 111, the first valve 22, the second valve 4121, and the third valve 36 are closed, and the fourth valve 37 is opened. At this time, no gas is delivered into the compressed air pipe 411, and no accumulated water 13 is discharged from the drain pipe 413. Only gas enters the extraction pipeline 3 through the sealing casing 111, the three-way pipeline 4, the extraction hose 32, and the three-way valve 31, and is then extracted to the ground for gas utilization.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A downward extraction drilling drainage system with a detachable orifice pipeline, characterized in that: The invention comprises a downward borehole (1), a compressed air pipeline (2) and a drainage pipeline (3), and also comprises a three-way pipeline (4) for connecting the downward borehole (1), the compressed air pipeline (2) and the drainage pipeline (3) and being detachably connected to the downward borehole (1), the compressed air pipeline (2) and the drainage pipeline (3), wherein the three-way pipeline (4) comprises a first connecting section (41), a second connecting section (42) and a third connecting section (43) which are connected at one end; a compressed air pipe (411) and a drainage pipe (413) are connected to the first connecting section (41); the first connecting section (41) is connected to the compressed air pipe (411) and the drainage pipe (413); ) is connected to the compressed air pipeline (2), the compressed air pipe (411) is detachably connected to the compressed air pipeline (2), the first connecting section (41) is connected to the extraction pipeline (3) through the drain pipe (413), and the drain pipe (413) is detachably connected to the extraction pipeline (3); the second connecting section (42) is connected to the downward borehole (1) through the two-blocking and one-injection sealing section (11), and the second connecting section (42) is detachably connected to the two-blocking and one-injection sealing section (11); the third connecting section (43) is connected to the extraction pipeline (3) and is detachably connected.

2. The downward extraction drilling drainage system with detachable orifice pipe according to claim 1 is characterized in that: The compressed air pipe (411) and the drainage pipe (413) are fixed in the first connecting section (41) via a sealing structure (415); the compressed air pipe (411) is connected to the compressed air pipeline (2) via a compressed air hose (412), and the drainage pipe (413) is connected to the extraction pipeline (3) via a drainage hose (414).

3. The downward extraction drilling drainage system with detachable orifice pipe according to claim 2 is characterized in that: The compressed air pipeline (2) and the compressed air hose (412) are detachably connected via a first joint (21); a first valve (22) is provided at one end of the compressed air pipeline (2) close to the first joint (21); and a second valve (4121) is provided at one end of the compressed air pipe (411) close to the compressed air hose (412).

4. The downward extraction drilling drainage system with detachable orifice pipe according to claim 2 is characterized in that: A sieve hole section (4131) is provided at one end of the drainage pipe (413) close to the downward drilling hole (1).

5. The downward extraction drilling drainage system with detachable orifice pipe according to claim 2 is characterized in that: The compressed air pipe (411) and the drainage pipe (413) are both four-branch pipes.

6. The downward extraction drilling drainage system with detachable orifice pipe according to claim 2 is characterized by: The sealing structure (415) is fixed to the first connecting section (41) by means of a threaded connection.

7. The downward extraction drilling drainage system with detachable orifice pipe according to claim 1, characterized in that: The two-blocking-one-injection sealing section (11) comprises a sealing sleeve (111) and a sealing ring (112) for fixing the sealing sleeve (111) in the downward borehole (1); an end of the sealing sleeve (111) away from the downward borehole (1) is detachably connected to the second connecting section (42) via a second joint (12).

8. The downward extraction drilling drainage system with detachable orifice pipe according to claim 2, characterized in that: The extraction pipeline (3) is provided with a three-way valve (31), and the three-way valve (31) is connected to the drainage hose (414), the extraction pipeline (3) and the extraction hose (32) respectively. The three-way valve (31) and the drainage hose (414) are detachably connected via a third joint (33), the three-way valve (31) and the extraction hose (32) are connected via a first pipe clamp (34), and the extraction hose (32) is detachably connected to the third connecting section (43) via a second pipe clamp (35).

9. The downward extraction drilling drainage system with detachable orifice pipe according to claim 8, characterized in that: The three-way valve (31) is provided with a third valve (36) at one end close to the third joint (33), and is provided with a fourth valve (37) at one end close to the first pipe clamp (34).

10. The downward extraction drilling drainage system with detachable orifice pipe according to claim 1, characterized in that: When the three-way pipeline (4) is removed, the extraction pipeline (3) is connected to the downward borehole (1) to achieve gas extraction.

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