An underground coal gasification drilling anti-leakage plugging device

Abstract

The present invention discloses an anti-leakage plugging device for underground coal gasification drilling, which comprises: a sealing end seat, a detachable seal embedded in the underground drilling port, an external extraction seat being arranged on one side of the sealing end seat, one end of the external extraction seat coaxially extending into the sealing end seat, and the other end of the external extraction seat being connected with a discharge pipe; a drainage pipe, sleeved and fixed on the other side of the sealing end seat, and connected with the external extraction seat through the sealing end seat; an internal extraction pipe, coaxially arranged in the drainage pipe, for coal gasification micro-extraction; and a steering plugging assembly, which can be relatively slidably arranged outside the drainage pipe in the underground drilling, and the steering plugging assembly can insert nails to fill cracks on the inner wall of the underground drilling, thereby preventing gas leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of underground coal gasification mining, and in particular is an anti-leakage plugging device for underground coal gasification drilling. Background Art

[0002] Underground coal gasification mainly burns underground coal in coal seams, gasifies it into coal gas, and transports it to the surface as energy or chemical raw materials. It is particularly suitable for coal seams that cannot be mined or are uneconomical to mine by conventional methods. At present, during underground mining, cracks appear on the well wall, causing coalbed methane to enter the formation through the cracks and cause serious pollution to the formation; and the conventional method of injecting cement to seal the cracks in the well wall needs to be carried out under the condition of stopping work and production, which delays the construction period and seriously causes huge economic losses. Therefore, those skilled in the art provide an underground coal gasification drilling anti-leakage plugging device to solve the problems raised in the above background technology. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: an underground coal gasification drilling anti-leakage plugging device, comprising:

[0004] A sealing end seat, a detachable seal is embedded in the underground drilling port, one side of the sealing end seat is provided with an external extraction seat, one end of the external extraction seat coaxially extends into the sealing end seat, and the other end is connected to a discharge pipe;

[0005] A drainage tube is sleeved and fixed on the other side of the sealing end seat and is connected to an external extraction seat through the sealing end seat;

[0006] An inner extraction pipe, which is co-centeredly arranged in the drainage pipe and is used for micro-extraction of coal gasification; and

[0007] The steering plugging component can be relatively slidably arranged outside the drainage pipe in the underground drilling well. The steering plugging component can insert nails to fill the cracks on the inner wall of the underground drilling well to prevent gas leakage.

[0008] Further, as a preference, the steering blocking assembly comprises:

[0009] The outer guide rods are symmetrically arranged outside the drainage tube in the circumferential direction with the axis of the sealing end seat as the axis center, and each of the outer guide rods is arranged parallel to the drainage tube;

[0010] A sleeve tube is limitedly slidable on the outer guide rod, a plurality of mounting seats are arranged on the circumference of the sleeve tube, and a driving wheel is rotatably arranged on each mounting seat;

[0011] An installation kit is fixed on the sleeve tube at a side away from the sealing end seat through a bracket;

[0012] A nail embedding assembly is relatively rotatably arranged on the installation kit; and

[0013] There are multiple side pressure caulking assemblies arranged in a circle, and each of the side pressure caulking assemblies is fixed on the installation kit.

[0014] Further, as a preference, the nail supply and embedding assembly comprises:

[0015] An outer rotating disk, the rotating sleeve is arranged on the installation kit, the installation kit is provided with a driving gear, the driving gear is meshed with the outer rotating disk for transmission;

[0016] The nail row cavity is configured as an arc-shaped structure, and a plurality of column nails are arranged in the nail row cavity;

[0017] A guide tube is vertically fixed to one side of the nail row cavity and communicated with the nail row cavity; and

[0018] The high pressure stroke seat is fixed on one end of the guide pipe.

[0019] Further, preferably, the side pressure caulking assembly comprises:

[0020] A plurality of limit rods are arranged circumferentially, each of the limit rods is transversely fixed on the installation kit, and a guide block is slidably arranged on the limit rod;

[0021] A top support member vertically slides on each of the guide blocks, a roller is provided below the top support member, and a support spring is sleeved on the top support member below the guide block;

[0022] A sealing pressure cylinder is transversely fixed on the installation kit, a plunger rod is relatively slidably arranged in the sealing pressure cylinder, and one end of the plunger rod is connected to the guide block;

[0023] An outer plastic film is sleeved on the installation kit and is located outside the top support member; and

[0024] The main booster bin body is fixed on the installation kit, and the main booster bin body is connected with each of the sealing pressure cylinders.

[0025] Further, as a preference, an outer ring component is coaxially and detachably fixed to the installation kit, a raised ring block is provided on the outer ring component, and the top support component is displaced and slid along the surface of the outer ring component.

[0026] Further, as a preferred embodiment, the main booster chamber is constructed into an inverted L-shaped structure, and an inner plug is slidably arranged inside the main booster chamber through a telescopic column; and a driving disk is also provided on one side of the main booster chamber, and a side guide plug is slidably arranged in the main booster chamber corresponding to the displacement, and the driving disk is connected to the side guide plug through a support rod;

[0027] In addition, an airflow ring bin is provided outside the installation kit, and the main boost bin body is connected with each of the sealing pressure cylinders through the airflow ring bin.

[0028] Further, as a preference, the top support member comprises:

[0029] Lower fixings;

[0030] Two side guide frames are vertically symmetrically arranged on the left and right sides, and each of the side guide frames is fixed on the lower fixing member;

[0031] An inner support seat, slidably disposed on the side guide frame;

[0032] A connecting spring is sleeved on the side guide frame and located on the upper and lower sides of the inner support seat;

[0033] The forming wheel is rotatably arranged on the inner support seat.

[0034] Further, preferably, a linear oscillator is also provided on one side of the side guide frame.

[0035] Furthermore, preferably, an inflatable bladder is provided on one side of the installation kit, and the inflatable bladder is connected to the main boost chamber through a control valve.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] In the present invention, the sealing end seat is embedded in the underground drilling port, and a drainage pipe is arranged on one side of the sealing end seat, which can be connected with an external extraction seat to realize continuous extraction, wherein a steering plugging assembly is slidably arranged on the drainage pipe, and the steering plugging assembly can perform emergency treatment on cracks on the inner wall of the drilling well to avoid coal gasification leakage. Especially during use, the nail embedding assembly can insert nails to fill the relatively large crack openings, and then the side pressure filling assembly is used to shape the surface, the filling efficiency is high, and it is not easy to cause structural damage to the inner wall of the drilling well. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the present invention;

[0039] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the steering plugging assembly of the present invention;

[0041] Figure 4 It is a structural schematic diagram of the nail embedding assembly in the present invention;

[0042] Figure 5 It is a structural schematic diagram of the side pressure caulking assembly in the present invention;

[0043] Figure 6 It is a schematic diagram of the structure of the top support member and the main pressurizing chamber body in the present invention;

[0044] In the figure: 1 sealing end seat, 2 drainage pipe, 3 internal extraction pipe, 4 steering plugging assembly, 5 external extraction seat, 6 discharge pipe, 7 external guide rod, 8 sleeve pipe, 9 driving wheel, 10 mounting seat, 11 nail embedding assembly, 12 side pressure caulking assembly, 13 mounting kit, 14 external rotating disk, 15 nail row cavity, 16 high pressure stroke seat, 17 guide pipe, 18 guide block, 19 external plastic film, 20 top support member, 21 main booster chamber, 22 sealing pressure cylinder, 23 plunger rod, 24 outer ring member, 25 support spring, 26 telescopic column member, 27 driving disk, 28 airflow ring chamber, 29 connecting spring, 30 internal support seat, 31 molding wheel, 32 side guide frame, 33 inflatable bladder. DETAILED DESCRIPTION

[0045] See also Figure 1 In an embodiment of the present invention, an underground coal gasification drilling anti-leakage plugging device comprises:

[0046] A sealing end seat 1, a detachable seal is embedded in the underground drilling port, and an external extraction seat 5 is arranged on one side of the sealing end seat 1, one end of the external extraction seat 5 coaxially extends into the sealing end seat 1, and the other end is connected to a discharge pipe 6; it is used to extract and discharge coal gasification;

[0047] The drainage tube 2 is sleeved and fixed on the other side of the sealing end seat 1, and is connected with the external extraction seat 5 through the sealing end seat 1;

[0048] An inner extraction pipe 3, which is co-centeredly arranged in the drainage pipe 2 and is used for micro-extraction of coal gasification; and

[0049] The steering plugging component 4 can be relatively slidably arranged outside the drainage pipe 2 in the underground drilling. The steering plugging component 4 can insert nails to fill the cracks on the inner wall of the underground drilling to prevent gas leakage. Among them, the steering plugging component can seal the inside of the drilling in real time without affecting the coal gasification extraction work.

[0050] In this embodiment, the steering blocking component 4 includes:

[0051] The outer guide rods 7 are symmetrically arranged outside the drainage tube 2 in the circumferential direction with the axis of the sealing end seat 1 as the axis center, and each of the outer guide rods 7 is arranged parallel to the drainage tube 2;

[0052] A sleeve pipe 8 is limitedly slidable on the outer guide rod 7, and a plurality of mounting seats 10 are arranged on the circumference of the sleeve pipe 8, and a driving wheel 9 is rotatably arranged on each mounting seat 10;

[0053] An installation kit 13 is fixed to the sleeve tube 8 on a side away from the sealing end seat 1 through a bracket;

[0054] A nail embedding assembly 11 is relatively rotatably disposed on the installation kit 13; and

[0055] There are multiple side pressure caulking assemblies 12 arranged in a circle, and each of the side pressure caulking assemblies 12 is fixed on the installation kit 13. That is to say, the nail embedding assembly and the side pressure caulking assembly are mainly driven by the driving wheel to perform axial displacement relative to each other, so as to be appropriately adjusted according to the crack position.

[0056] As a preferred embodiment, the nail embedding assembly 11 includes:

[0057] An outer rotating disk 14 is rotatably sleeved on the mounting kit 13, and a driving gear is provided on the mounting kit 13, and the driving gear is meshed with the outer rotating disk 14 for transmission;

[0058] The nail row cavity 15 is configured as an arc-shaped structure, and a plurality of column nails are arranged in the nail row cavity 15;

[0059] A guide tube 17 is vertically fixed to one side of the nail row cavity 15 and communicated with the nail row cavity 15; and

[0060] The high-pressure stroke seat 16 is fixed at one end of the guide pipe 17. The high-pressure stroke seat can sequentially and highly pressure-push column nails into the inner wall of the well. A plurality of column nails can be buried according to the size of the cracks, thereby being able to adaptively fill various types of cracks.

[0061] In this embodiment, the side pressure caulking assembly 12 includes:

[0062] A plurality of limiting rods are arranged circumferentially, each of the limiting rods is transversely fixed on the installation kit 13, and a guide block 18 is slidably arranged on the limiting rod;

[0063] A top support member 20 vertically slides on each of the guide blocks 18, a roller is provided below the top support member 20, and a support spring 25 is sleeved on the top support member 20 below the guide block 18;

[0064] A sealing pressure cylinder 22 is transversely fixed on the installation kit 13, and a plunger rod 23 is relatively slidably arranged in the sealing pressure cylinder 22, and one end of the plunger rod 23 is connected to the guide block 18;

[0065] An outer plastic film 19 is sleeved on the installation kit 13 and is located outside the top support member 20; and

[0066] The main boost chamber body 21 is fixed on the installation kit 13, and the main boost chamber body 21 is connected to each of the sealing pressure cylinders 22. That is to say, the plunger rod in each sealing pressure cylinder can enable the support member to perform external shaping and trimming on the crack during the displacement and sliding action; and when a crack appears at a certain place, multiple support members can compact and fill the entire cross-section of the crack, thereby avoiding the occurrence of cracks in other directions of the same cross-section caused by a single filling (the drainage tube can be adjusted).

[0067] In this embodiment, an outer ring member 24 is coaxially and detachably fixed on the installation kit 13, and a raised ring block is provided on the outer ring member 24. The top support member 20 slides along the surface of the outer ring member 24. In particular, when the guide block is displaced to the raised ring block, the top support member can be expanded upward by the top pressure of the raised ring block, thereby achieving a filling and compacting effect on the drilling cracks during movement. In particular, for drilling cracks with relatively small crack openings, the filling effect can be achieved directly by the shaping and trimming of the top support member, and at the same time, a corresponding naturally formed recess can be formed around the cracks, so that the mudstone around the cracks can be compacted to avoid secondary cracks.

[0068] In this embodiment, the main booster chamber 21 is constructed into an inverted L-shaped structure, and an inner plug is slidably provided inside the main booster chamber 21 through a telescopic column 26; and a driving disk 27 is also provided on one side of the main booster chamber 21, and a side guide plug is slidably provided in the main booster chamber 21 corresponding to the displacement, and the driving disk 27 is connected to the side guide plug through a support rod;

[0069] In addition, an airflow ring warehouse 28 is also provided outside the installation kit 13. The main booster warehouse body 21 is connected with each of the sealing pressure cylinders 22 through the airflow ring warehouse 28. In particular, during use, the inner plug is preferentially pushed to move laterally through the telescopic column. At this time, each sealing pressure cylinder can be synchronously injected with air by the airflow ring warehouse, so that the plunger rod pushes the top support member to shape the initial cracks, and then the top support member can be reset to the raised ring block. At this time, the side guide plug is driven by the driving disk to move back and forth, thereby realizing the floating airflow delivery in each sealing pressure cylinder, so that each top support member can perform corresponding axial reciprocating movement, so that the cracks can be shaped multiple times when passing through the raised ring block, so that the surrounding mudstone can achieve an integrated compaction effect.

[0070] As a preferred embodiment, the top support member 20 includes:

[0071] Lower fixings;

[0072] Two side guide frames 32 are vertically symmetrically arranged on the left and right sides, and each of the side guide frames 32 is fixed on the lower fixing member;

[0073] An inner support seat 30 is slidably disposed on the side guide frame 32;

[0074] The connecting spring 29 is sleeved on the side guide frame 32 and located at the upper and lower sides of the inner support seat 30;

[0075] The forming wheel 31 is rotatably disposed on the inner support seat 30 .

[0076] In this embodiment, a linear oscillator is also provided on one side of the side guide frame 32, which can particularly realize the self-vibration effect of the main body of the top support member, so that when dealing with high-hardness mudstone, the structure can be gradually crushed, and the repair effect is high;

[0077] In this embodiment, an inflatable bladder 33 is further provided on one side of the installation kit 13, and the inflatable bladder 33 is connected to the main booster chamber 21 through a control valve, wherein the inflatable bladder can also achieve overall sealing inside the drilling well, and has strong sealing performance.

[0078] Specifically, the sealing end seat can be sealed and embedded in the underground drilling port. At this time, the drainage pipe cooperates with the inner extraction pipe to perform coal gasification extraction work. When the coal gasification extraction gas pressure is significantly reduced, the inner wall of the borehole can be sealed by the inflatable sac, and the cracks can be detected under gradual displacement, and the nail embedding component can bury one or more column nails according to the size of the crack; at the same time, after the nail insertion and caulking are completed, the side pressure caulking component expands and shapes the cracks at the nail insertion location, so that corresponding naturally formed recesses are formed around the cracks, so that the surrounding mudstone can achieve a compacting effect, especially the various locations of the drilling at the same cross section can be compacted simultaneously, thereby avoiding a single caulking causing cracks in other directions at the same cross section.

[0079] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An underground coal gasification drilling anti-leakage plugging device, characterized in that: It includes: A sealing end seat (1), wherein a detachable seal is embedded in an underground drilling port, an external extraction seat (5) is provided on one side of the sealing end seat (1), one end of the external extraction seat (5) coaxially extends into the sealing end seat (1), and the other end thereof is connected to a discharge pipe (6); A drainage tube (2) is sleeved and fixed on the other side of the sealing end seat (1), and is connected to an external extraction seat (5) through the sealing end seat (1); An inner extraction pipe (3) is co-centeredly arranged inside the drainage pipe (2) and is used for coal gasification micro-extraction; as well as A steering plugging assembly (4) is relatively slidably arranged outside the drainage pipe (2) and located in an underground wellbore, and the steering plugging assembly (4) can insert nails to fill cracks on the inner wall of the underground wellbore, thereby preventing gas leakage; The steering blocking component (4) comprises: The outer guide rods (7) are symmetrically arranged outside the drainage tube (2) with the axis of the sealing end seat (1) as the axis, and each of the outer guide rods (7) is arranged parallel to the drainage tube (2); A sleeve pipe (8) is limitedly slidable on the outer guide rod (7), a plurality of mounting seats (10) are arranged on the circumference of the sleeve pipe (8), and a driving wheel (9) is rotatably arranged on each mounting seat (10); An installation kit (13) is fixed to the sleeve tube (8) via a bracket on a side away from the sealing end seat (1); A nail embedding assembly (11) is relatively rotatably arranged on the installation kit (13); and A plurality of side pressure caulking assemblies (12) are arranged around a circle, and each of the side pressure caulking assemblies (12) is fixed on the installation kit (13); The nail supply and embedding assembly (11) comprises: An outer rotating disk (14) is rotatably sleeved on the mounting kit (13), the mounting kit (13) is provided with a driving toothed member, the driving toothed member is meshed with the outer rotating disk (14) for transmission; The nail row cavity (15) is configured as an arc-shaped structure, and a plurality of column nails are arranged in the nail row cavity (15); A guide tube (17) is vertically fixed to one side of the nail row cavity (15) and is in communication with the nail row cavity (15); and The high-pressure stroke seat (16) is fixed on one end of the guide pipe (17).

2. The underground coal gasification drilling anti-leakage plugging device according to claim 1, characterized in that: The side pressure caulking assembly (12) comprises: A plurality of limit rods are arranged in a circumferential direction, each of the limit rods is transversely fixed on the installation kit (13), and a guide block (18) is slidably arranged on the limit rod; A supporting member (20) vertically slides on each of the guide blocks (18), a roller is arranged below the supporting member (20), and a supporting spring (25) is sleeved on the supporting member (20) below the guide block (18); A sealing pressure cylinder (22) is transversely fixed on the installation kit (13), a plunger rod (23) is relatively slidably arranged in the sealing pressure cylinder (22), and one end of the plunger rod (23) is connected to the guide block (18); An outer plastic film (19) is sleeved on the installation kit (13) and is located outside the top support member (20); and The main booster chamber (21) is fixed on the installation kit (13), and the main booster chamber (21) is connected to each of the sealing pressure cylinders (22).

3. The underground coal gasification drilling anti-leakage plugging device according to claim 2, characterized in that: An outer ring member (24) is also coaxially and detachably fixed on the installation kit (13), and a raised ring block is provided on the outer ring member (24). The supporting member (20) is displaced and slid along the surface of the outer ring member (24).

4. The underground coal gasification drilling anti-leakage plugging device according to claim 2, characterized in that: The main booster chamber (21) is constructed into an inverted L-shaped structure, and an inner plug is slidably arranged inside the main booster chamber (21) via a telescopic column (26); a driving disk (27) is also arranged on one side of the main booster chamber (21), and a side guide plug is slidably arranged in the main booster chamber (21) corresponding to the displacement, and the driving disk (27) is connected to the side guide plug via a support rod; In addition, an airflow ring chamber (28) is provided outside the installation kit (13), and the main boost chamber body (21) is connected to each of the sealing pressure cylinders (22) through the airflow ring chamber (28).

5. The underground coal gasification drilling anti-leakage plugging device according to claim 2, characterized in that: The top support member (20) comprises: Lower fixings; Two side guide frames (32) are vertically symmetrically arranged on the left and right sides, and each of the side guide frames (32) is fixed on the lower fixing member; An inner support seat (30) is slidably arranged on the side guide frame (32); A connecting spring (29) is sleeved on the side guide frame (32) and is located on the upper and lower sides of the inner support seat (30); The forming wheel (31) is rotatably arranged on the inner support seat (30).

6. The underground coal gasification drilling anti-leakage plugging device according to claim 5, characterized in that: A linear oscillator is also provided on one side of the side guide frame (32).

7. The underground coal gasification drilling anti-leakage plugging device according to claim 2, characterized in that: An inflatable sac (33) is also provided on one side of the installation kit (13), and the inflatable sac (33) is connected to the main pressurizing chamber (21) via a control valve.

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