Pressure relief gas extraction ground drilling anti-breakage device

Abstract

The present application provides a ground drilling anti-breakage device for pressure relief gas extraction, comprising a bedrock layer; the lower part of the bedrock layer comprises a protected layer and a protective layer, a protected layer hole is opened between the bedrock layer and the protected layer, a protective layer hole is opened between the protected layer and the protective layer, a bare hole is provided in the lower part of the protective layer, a first gas extraction pipe is provided in the protected layer hole, a second gas extraction pipe is provided in the protective layer hole, the second gas extraction pipe is provided with a protective layer sieve hole at the position of the protective layer hole, and the first gas extraction pipe is provided with a protected layer sieve hole at the position of the protected layer hole; a pressure relief protection mechanism is fixedly installed inside the first gas extraction pipe; the present invention is conducive to improving the extraction efficiency of the protective layer, the protected layer and the interlayer gas, and ensuring the safe recovery of the working surface of the protective layer and the protected layer.

Description

Technical Field

[0001] The present application relates to the technical field of coal mining, and in particular to a ground drilling anti-breakage device for pressure relief gas extraction. Background Art

[0002] Coal mine gas is one of the main disasters threatening the safe production of coal mines, but at the same time, gas is a clean energy with very abundant reserves. Nowadays, most coal mines are preventing and controlling gas disasters through extraction, which can not only achieve safe production in coal mines, but also make rational use of the extracted gas to reduce energy losses. At present, ground wells use 2-3 layers of casing to extract gas, and open sieve holes in the inner tube between the protective layer and the protected layer to extract the gas from the protective layer and the pressure relief gas from the protected layer, so that mining activities can be carried out only after the gas in the mine meets the standards. However, since the protective layer is mined first, and the gas is transported and enriched in the upper corner during the mining of the protective layer, when the protected layer is mined, there is a possibility of excessive gas in the upper corner, which brings safety hazards to coal mining; and there are many bending and breaking phenomena during the use of on-site ground drilling, which blocks the gas extraction path, causing a large amount of economic losses and failing to achieve the expected gas extraction effect. Summary of the invention

[0003] In order to make up for the above shortcomings, the present application provides a ground drilling anti-breakage device for pressure relief gas extraction, which aims to improve the existing gas extraction due to the first mining of the protective layer. At the same time, during the mining of the protective layer, the gas migrates and the gas is enriched in the upper corner position, so that when the protected layer is mined, there is a possibility of gas exceeding the limit in the upper corner position.

[0004] The embodiment of the present application provides a pressure relief gas extraction ground drilling anti-breakage device, including a bedrock layer;

[0005] The lower part of the bedrock layer includes a protected layer and a protective layer, a protected layer hole is opened between the bedrock layer and the protected layer, a protective layer hole is opened between the protected layer and the protective layer, a bare hole is provided at the lower part of the protective layer, a first gas extraction pipe is provided in the protected layer hole, a second gas extraction pipe is provided in the protective layer hole, the second gas extraction pipe is provided with a protective layer sieve hole at the position of the protective layer hole, and the first gas extraction pipe is provided with a protected layer sieve hole at the position of the protected layer hole;

[0006] A pressure relief protection mechanism is fixedly installed inside the first gas extraction pipe, and the pressure relief protection mechanism includes a fixing rod, which is fixedly connected to the inner wall of the first gas extraction pipe, and the lower part of the fixing rod is fixedly connected to a support plate, and two springs are fixedly connected to the two sides of the support plate, and the other ends of the two springs are fixedly connected to sealing plates, and the sealing plates on both sides are respectively fitted and connected to the inner wall of the first gas extraction pipe, and the sealing plates on both sides fit and seal the sieve holes of the protected layer.

[0007] In the above-mentioned implementation process, the present invention realizes gas extraction through the first gas extraction pipe and the second gas extraction pipe, and the protected layer sieve holes and the protective layer sieve holes are respectively provided on the first gas extraction pipe and the second gas extraction pipe, which is beneficial to improve the extraction efficiency of the protective layer, the protected layer and the interlayer gas, and ensure the safe recovery of the protective layer and the protected layer working surface, and a pressure relief protection mechanism is provided on the inner side of the protected layer sieve hole, which can adjust the gas pressure of the upper and lower layers according to the pressure difference between the protected layer hole and the protective layer hole, effectively maintain the gas pressure difference between the protected layer hole and the protective layer hole, and realize the safety between the protective layer and the protected layer.

[0008] In a specific embodiment, the ends of the first gas extraction pipe and the second gas extraction pipe are both provided with L-shaped threaded connection ports, and the first gas extraction pipe and the second gas extraction pipe are threadedly connected via the L-shaped threaded connection ports.

[0009] In the above implementation process, the setting of the L-shaped threaded connection port can enable the first gas extraction pipe and the second gas extraction pipe to be connected in a staggered manner, thereby maintaining the sealing and stability of the first gas extraction pipe and the second gas extraction pipe when connected.

[0010] In a specific embodiment, a connection groove is provided at the top of the second gas extraction pipe, a sealing rubber pad is fixedly installed at the top of the second gas extraction pipe, and ends of the sealing rubber pad are respectively attached to the inner walls of the first gas extraction pipe and the second gas extraction pipe.

[0011] In the above implementation process, the setting of the sealing rubber pad can effectively seal the connection between the first gas extraction pipe and the second gas extraction pipe, thereby preventing leakage from occurring at the connection between the first gas extraction pipe and the second gas extraction pipe.

[0012] In a specific embodiment, the sealing rubber pad includes a fixed connecting block, which is fixedly connected to the inside of the connecting groove, a connecting part is fixedly provided on the upper part of the fixed connecting block, and a sealing fitting part is fixedly provided on one side of the connecting part, and the sealing fitting part is fitted and connected to the inner walls of the first gas extraction pipe and the second gas extraction pipe.

[0013] In the above implementation process, the setting of the fixed connection block can make the connection of the sealing rubber pad more stable and prevent it from falling off, and the setting of the sealing fitting portion can effectively increase the sealing performance.

[0014] In a specific embodiment, a threaded connection groove is provided at the connection between the first gas extraction pipe and the second gas extraction pipe, a connecting nut is provided in the threaded connection groove of the first gas extraction pipe, and the connecting nut is threadedly connected to the threaded connection groove of the second gas extraction pipe.

[0015] In the above implementation process, the threaded connection groove and the connection nut can realize the threaded connection of the outer sides of the first gas extraction pipe and the second gas extraction pipe, which can not only realize effective installation connection, but also achieve a certain sealing performance.

[0016] In a specific embodiment, a first borehole is opened in the bedrock layer, a second borehole is opened in the protected layer and the protective layer, the first gas extraction pipe passes through the first borehole and the second borehole, and the second gas extraction pipe is located at the bottom end of the second borehole.

[0017] In the above implementation process, the setting of the first drilling hole and the second drilling hole can realize the effective and safe placement of the first gas extraction pipe and the second gas extraction pipe.

[0018] In a specific embodiment, the outer side of the first gas extraction pipe is sleeved with a second-opening oil casing, the outer side of the second-opening oil casing is sleeved with a first-opening oil casing, and the first-opening oil casing is located in the first-opening borehole.

[0019] In the above implementation process, the setting of the second opening oil casing and the first opening oil casing can realize effective safety protection of the first gas extraction pipe, thereby protecting the safety of the first gas extraction pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of a cross-sectional structure provided by an embodiment of the present application;

[0022] Figure 2 Provided for the implementation of this application Figure 1 A is an enlarged schematic diagram;

[0023] Figure 3 Provided for the implementation of this application Figure 1 The enlarged schematic diagram of point B in FIG.

[0024] Figure 4 A schematic flow chart of the method steps provided for the implementation of the present application.

[0025] In the figure: 1. bedrock layer; 2. protected layer; 3. protective layer; 4. protected layer hole; 5. protected layer hole; 6. bare hole; 7. first gas extraction pipe; 8. second gas extraction pipe; 9. protective layer sieve hole; 10. protected layer sieve hole; 11. connecting groove; 12. sealing rubber pad; 1201. fixed connecting block; 1202. connecting part; 1203. sealing fitting part; 13. pressure relief protection mechanism; 1301. fixing rod; 1302. supporting plate; 1303. spring; 1304. sealing plate; 14. L-shaped threaded connection port; 15. threaded connection groove; 16. connecting nut; 17. two-opening oil casing; 18. single-opening oil casing. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0027] See also Figure 1-3 The present application provides a ground drilling anti-breakage device for decompression gas extraction, comprising a bedrock layer 1. The lower part of the bedrock layer 1 comprises a protected layer 2 and a protective layer 3, a protected layer hole 4 is provided between the bedrock layer 1 and the protected layer 2, a protective layer hole 5 is provided between the protected layer 2 and the protective layer 3, an open hole 6 is provided at the lower part of the protective layer 3, a first gas extraction pipe 7 is provided in the protected layer hole 4, a second gas extraction pipe 8 is provided in the protective layer hole 5, the second gas extraction pipe 8 is provided with a protective layer sieve hole 9 at the position of the protective layer hole 5, and the first gas extraction pipe 7 is provided with a protected layer sieve hole 10 at the position of the protected layer hole 4.

[0028] A pressure relief protection mechanism 13 is fixedly installed inside the first gas extraction pipe 7, and the pressure relief protection mechanism 13 includes a fixing rod 1301, and the fixing rod 1301 is fixedly connected to the inner wall of the first gas extraction pipe 7, and the lower part of the fixing rod 1301 is fixedly connected to a support plate 1302, and two springs 1303 are fixedly connected to both sides of the support plate 1302, and the other ends of the two springs 1303 are fixedly connected to sealing plates 1304, and the sealing plates 1304 on both sides are respectively fitted and connected to the inner wall of the first gas extraction pipe 7, and the sealing plates 1304 on both sides fit and seal the sieve holes 10 of the protected layer.

[0029] The present invention realizes gas extraction through the first gas extraction pipe 7 and the second gas extraction pipe 8, and the first gas extraction pipe 7 and the second gas extraction pipe 8 are respectively provided with a protected layer sieve hole 10 and a protective layer sieve hole 9, which is beneficial to improve the extraction efficiency of the protective layer, the protected layer and the interlayer gas, and ensure the safe recovery of the protective layer and the protected layer working surface. In addition, a pressure relief protection mechanism 13 is provided on the inner side of the protected layer sieve hole 10, which can adjust the gas pressure of the upper and lower layers according to the pressure difference between the protected layer hole 4 and the protective layer hole 5, effectively maintain the gas pressure difference in the protected layer hole 4 and the protective layer hole 5, and realize the safety between the protective layer 3 and the protected layer 2.

[0030] In this embodiment, the ends of the first gas extraction pipe 7 and the second gas extraction pipe 8 are both provided with an L-shaped threaded connection port 14, and the first gas extraction pipe 7 and the second gas extraction pipe 8 are threadedly connected through the L-shaped threaded connection port 14. The setting of the L-shaped threaded connection port 14 can enable the first gas extraction pipe 7 and the second gas extraction pipe 8 to be staggeredly connected, and maintain the sealing and stability of the first gas extraction pipe 7 and the second gas extraction pipe 8 when connected. The top of the second gas extraction pipe 8 is provided with a The second gas extraction pipe 8 has a connecting groove 11, and a sealing rubber pad 12 is fixedly installed on the top of the second gas extraction pipe 8. The ends of the sealing rubber pad 12 are respectively fitted on the inner walls of the first gas extraction pipe 7 and the second gas extraction pipe 8. The setting of the sealing rubber pad 12 can effectively seal the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8, and can prevent leakage from occurring at the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8. The sealing rubber pad 12 includes a fixed connection block 1201. The fixed connection The connecting block 1201 is fixedly connected to the inside of the connecting groove 11, and a connecting portion 1202 is fixedly provided on the upper part of the fixed connecting block 1201. A sealing fitting portion 1203 is fixedly provided on one side of the connecting portion 1202. The sealing fitting portion 1203 is fitted and connected to the inner walls of the first gas extraction pipe 7 and the second gas extraction pipe 8. The setting of the fixed connecting block 1201 can make the connection of the sealing rubber pad 12 more stable and prevent it from falling off, and the setting of the sealing fitting portion 1203 can effectively increase the To improve the sealing performance, a threaded connection groove 15 is provided at the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8. A connecting nut 16 is provided in the threaded connection groove 15 of the first gas extraction pipe 7. The connecting nut 16 is threadedly connected to the threaded connection groove 15 of the second gas extraction pipe 8. The threaded connection groove 15 and the connecting nut 16 can realize threaded connection of the outer sides of the first gas extraction pipe 7 and the second gas extraction pipe 8, which can achieve both effective installation connection and a certain sealing performance.

[0031] In the present application document, a first borehole is opened in the bedrock layer 1, and a second borehole is opened in the protected layer 2 and the protective layer 3. The first gas extraction pipe 7 passes through the first borehole and the second borehole, and the second gas extraction pipe 8 is located at the bottom of the second borehole. The setting of the first borehole and the second borehole can realize the effective and safe placement of the first gas extraction pipe 7 and the second gas extraction pipe 8. The outer side of the first gas extraction pipe 7 is sleeved with a second oil casing 17, and the outer side of the second oil casing 17 is sleeved with a first oil casing 18, and the first oil casing 18 is located in the first borehole. Through the setting of the second oil casing 17 and the first oil casing 18, the first gas extraction pipe 7 can be effectively protected and the safety of the first gas extraction pipe 7 can be protected.

[0032] refer to Figure 4 , in the specific setting, it also includes the use method of the pressure relief gas extraction ground drilling anti-breakage device:

[0033] S1, firstly, drilling holes between the bedrock layer 1, the protected layer 2 and the protective layer 3: that is, a drill hole is opened in the bedrock layer 1 and the protected layer 2, a drill hole is opened in the protected layer 2 and the protective layer 3, and a protected layer hole 4 is opened in the bedrock layer 1 and the protected layer 2, and a protective layer hole 5 is opened in the protected layer 2 and the protective layer 3;

[0034] S2, installing the first gas extraction pipe 7 and the second gas extraction pipe 8: installing the first gas extraction pipe 7 and the second gas extraction pipe 8 in the first borehole and the second borehole, and then pouring cement mortar between the first gas extraction pipe 7, the second gas extraction pipe 8, the first borehole and the second borehole for regional reinforcement;

[0035] S3, extracting gas: extracting gas from the protected layer hole 4 and the protective layer hole 5 through an external power device, that is, when the gas in the protective layer hole 5 is extracted, the pressure is relatively high, and at this time, the pressure relief protection mechanism 13 inside the protected layer hole 4 cannot be pushed open by the gas pressure in the protected layer hole 4;

[0036] S4, the pressure relief protection mechanism 13 implements pressure regulation processing: when the pressure inside the protective layer hole 5 decreases, the pressure inside the protected layer hole 4 increases. At this time, the gas pressure squeezes the spring 1303 and the sealing plate 1304 through the protected layer sieve hole 10, so that the gas can enter the first gas extraction pipe 7, so that the internal air pressure protection layers of the protected layer hole 4 and the protective layer hole 5 are stably balanced, effectively preventing bending and breakage during drilling.

[0037] By digging holes in the areas where the drilling is prone to bending and breaking, and re-grouting and reinforcing, the ability of the ground drilling to resist bending and breaking is enhanced, and the gas extraction effect of the drilling surface is improved. The method for preventing the breaking of the ground drilling for pressure relief gas extraction can effectively prevent the drilling from bending and breaking by completing the first drilling and the second drilling in sequence, digging holes on the upper part of the protective layer 3 and the upper part of the protected layer 2, and reinforcing the area where the cement mortar is not injected; at the same time, the first gas extraction pipe 7 and the second gas extraction pipe 8 are respectively provided with protective layer sieve holes 9 and protected layer sieve holes 10 within the height range of the protected layer 2 and the protective layer 3, which is conducive to improving the extraction efficiency of the protective layer 3, the protected layer 2 and the interlayer gas, and ensuring the safe recovery of the working surface of the protective layer 3 and the protected layer 2.

[0038] When the first gas extraction pipe 7 and the second gas extraction pipe 8 in S2 are connected and installed, they are internally connected through the L-shaped threaded connection port 14 and externally connected through the connection nut 16, so as to realize a stable sealed connection between the first gas extraction pipe 7 and the second gas extraction pipe 8. The first gas extraction pipe 7 and the second gas extraction pipe 8 are effectively connected through the L-shaped threaded connection port 14 and the connection nut 16, so as to maintain the stability of the first gas extraction pipe 7 and the second gas extraction pipe 8. A sealing rubber pad 12 is provided at the connection of the gas extraction pipe 8 to achieve sealing and leak-proofing of the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8. The sealing rubber pad 12 is provided with a sealing fitting portion 1203. The sealing fitting portion 1203 is fitted and connected to the inner walls of the first gas extraction pipe 7 and the second gas extraction pipe 8 to achieve effective sealing and leak-proofing. The setting of the sealing rubber pad 12 can achieve effective sealing of the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8 to prevent gas leakage during transportation.

[0039] Specifically, the working principle of the pressure relief gas extraction ground drilling anti-breakage device is as follows: when in use, firstly, a hole is opened between the bedrock layer 1, the protected layer 2 and the protective layer 3: that is, a first borehole is opened in the bedrock layer 1 and the protected layer 2, a second borehole is opened in the protected layer 2 and the protective layer 3, and a protected layer hole 4 is opened in the bedrock layer 1 and the protected layer 2, and a protective layer hole 5 is opened in the protected layer 2 and the protective layer 3; the first gas extraction pipe 7 and the second gas extraction pipe 8 are installed: the first gas extraction pipe 7 and the second gas extraction pipe 8 are installed in the first borehole and the second borehole, and then the first gas extraction pipe 7, the second gas extraction pipe 8, the first borehole are opened, and the second gas extraction pipe 8 is opened. Pour cement mortar between the holes and the drilled hole for regional reinforcement; extract gas: extract gas from the protected layer hole 4 and the protective layer hole 5 through an external power device, that is, when the gas in the protective layer hole 5 is extracted, the pressure is relatively high, and at this time, the pressure relief protection mechanism 13 inside the protected layer hole 4 cannot be pushed open by the gas pressure in the protected layer hole 4; the pressure relief protection mechanism 13 implements pressure regulation processing: when the pressure inside the protective layer hole 5 decreases, the pressure inside the protected layer hole 4 increases, and at this time, the gas pressure squeezes the spring 1303 and the sealing plate 1304 through the protected layer sieve hole 10. The gas can enter the first gas extraction pipe 7, so that the internal air pressure protection layer of the protected layer hole 4 and the protective layer hole 5 is stably balanced, and the drilling is effectively prevented from bending and breaking. When the first gas extraction pipe 7 and the second gas extraction pipe 8 in S2 are connected and installed, they are internally connected through the L-shaped threaded connection port 14 and externally connected through the connecting nut 16, so as to realize the stable sealing connection between the first gas extraction pipe 7 and the second gas extraction pipe 8. The first gas extraction pipe 7 and the second gas extraction pipe 8 are effectively connected through the L-shaped threaded connection port 14 and the connecting nut 16, so as to maintain the first gas extraction pipe 7 and In order to ensure the stability of the second gas extraction pipe 8, a sealing rubber pad 12 is provided at the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8 to achieve sealing and leak-proofing of the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8. The sealing rubber pad 12 is provided with a sealing fitting portion 1203, and the sealing fitting portion 1203 is fitted and connected to the inner walls of the first gas extraction pipe 7 and the second gas extraction pipe 8 to achieve effective sealing and leak-proofing. The setting of the sealing rubber pad 12 can achieve effective sealing of the connection between the first gas extraction pipe 7 and the second gas extraction pipe 8 to prevent gas leakage during transportation.

[0040] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A ground drilling anti-breakage device for decompression gas extraction, comprising a bedrock layer (1), characterized in that ； The lower part of the bedrock layer (1) comprises a protected layer (2) and a protective layer (3); a protected layer hole (4) is provided between the bedrock layer (1) and the protected layer (2); a protective layer hole (5) is provided between the protected layer (2) and the protective layer (3); a bare hole (6) is provided at the lower part of the protective layer (3); a first gas extraction pipe (7) is provided in the protected layer hole (4); a second gas extraction pipe (8) is provided in the protective layer hole (5); a protective layer sieve hole (9) is provided in the second gas extraction pipe (8) at the position of the protective layer hole (5); and a protected layer sieve hole (10) is provided in the first gas extraction pipe (7) at the position of the protected layer hole (4); A pressure relief protection mechanism (13) is fixedly installed inside the first gas extraction pipe (7), and the pressure relief protection mechanism (13) comprises a fixing rod (1301), the fixing rod (1301) is fixedly connected to the inner wall of the first gas extraction pipe (7), the lower part of the fixing rod (1301) is fixedly connected to a support plate (1302), two springs (1303) are fixedly connected to the two sides of the support plate (1302), and the other ends of the two springs (1303) are fixedly connected to sealing plates (1304), the sealing plates (1304) on both sides are respectively fitted and connected to the inner wall of the first gas extraction pipe (7), and the sealing plates (1304) on both sides fit and seal the sieve holes (10) of the protected layer.

2. The anti-breakage device for pressure relief gas extraction surface drilling according to claim 1 is characterized in that: The ends of the first gas extraction pipe (7) and the second gas extraction pipe (8) are both provided with an L-shaped threaded connection port (14), and the first gas extraction pipe (7) and the second gas extraction pipe (8) are threadedly connected via the L-shaped threaded connection port (14).

3. The anti-breakage device for pressure relief gas extraction surface drilling according to claim 1 is characterized in that: A connecting groove (11) is provided at the top end of the second gas extraction pipe (8), and a sealing rubber pad (12) is fixedly installed at the top end of the second gas extraction pipe (8), and the ends of the sealing rubber pad (12) are respectively fitted on the inner walls of the first gas extraction pipe (7) and the second gas extraction pipe (8).

4. The anti-breakage device for pressure relief gas extraction surface drilling according to claim 3 is characterized in that: The sealing rubber pad (12) comprises a fixed connection block (1201), wherein the fixed connection block (1201) is fixedly engaged and connected to the inside of the connection groove (11), a connection portion (1202) is fixedly provided on the upper part of the fixed connection block (1201), and a sealing fitting portion (1203) is fixedly provided on one side of the connection portion (1202), and the sealing fitting portion (1203) is fitted and connected to the inner walls of the first gas extraction pipe (7) and the second gas extraction pipe (8).

5. The anti-breakage device for pressure relief gas extraction surface drilling according to claim 1 is characterized in that: A threaded connection groove (15) is provided at the connection between the first gas extraction pipe (7) and the second gas extraction pipe (8), a connection nut (16) is provided in the threaded connection groove (15) of the first gas extraction pipe (7), and the connection nut (16) is threadedly connected to the threaded connection groove (15) of the second gas extraction pipe (8).

6. The anti-breakage device for pressure relief gas extraction surface drilling according to claim 1 is characterized in that: A first borehole is opened in the bedrock layer (1), and a second borehole is opened in the protected layer (2) and the protective layer (3); the first gas extraction pipe (7) passes through the first borehole and the second borehole, and the second gas extraction pipe (8) is located at the bottom end of the second borehole.

7. The anti-breakage device for pressure relief gas extraction surface drilling according to claim 6 is characterized in that: The outer side of the first gas extraction pipe (7) is sleeved with a second-opening oil casing (17), and the outer side of the second-opening oil casing (17) is sleeved with a first-opening oil casing (18), and the first-opening oil casing (18) is located in the first-opening borehole.

Images