Blowout prevention device for drilling construction

Abstract

The utility model provides a blowout preventer for drilling construction. The blowout preventer comprises a construction pipe fitting, a first branch pipe fitting, a second branch pipe fitting and a connecting pipe, the construction pipe fitting is provided with a first one-way valve, a first branch pipe fitting and a second branch pipe fitting are arranged on the construction pipe fitting in a spaced mode and connected in parallel, and the pressure of gas capable of passing through the second branch pipe fitting is lower than that of gas capable of passing through the first branch pipe fitting. The free end of the first branch pipe fitting and the free end of the second branch pipe fitting are both arranged on the connecting pipe. The construction pipe fitting, the first branch pipe fitting, the second branch pipe fitting and the connecting pipe are arranged, the construction pipe fitting is provided with the first one-way valve, and gas sprayed out of the drill rod core cannot pass through the first one-way valve and can only enter the connecting pipe through the first branch pipe fitting or the second branch pipe fitting to be recycled; the gas ejected from the drill hole is prevented from entering a mine compressed air system or a roadway to endanger the construction safety.

Description

Technical Field

[0001] This utility model relates to the field of underground gas extraction technology in coal mines, specifically a blowout prevention device for drilling operations. Background Technology

[0002] Coal mines are reasonable spaces excavated by humans when mining geological layers rich in coal. Coal mine gas is a general term for various harmful gases produced during the production process of coal mines. It can cause asphyxiation, combustion, and even explosion, endangering the personal safety of coal mine workers and the safety of coal mine property.

[0003] When coal miners are mining and tunneling, they need to enter the underground roadways and carry out mining operations at the mining faces. Coal mining generates methane gas during the coal extraction process. This methane gas can drift into the roadways where miners work, seriously threatening the safety of the mine and the health of the workers. To control methane gas, it is necessary to pre-drain the coal seam through drilling, thus reducing the amount of methane emitted during mining operations and ensuring safe production. However, methane often erupts from the boreholes during drilling, and sometimes even enters the compressed air system through the drill core or during drill rod replacement. This often causes the methane concentration at the drilling site to exceed the limit instantaneously, endangering construction safety and even entering the mine's compressed air system, thus jeopardizing its safety.

[0004] Existing blowout prevention technologies mainly involve extraction measures at the borehole opening to address the problem of gas ejection at the borehole slag discharge point. When gas is ejected from the borehole, it is introduced into the extraction system. However, existing technologies and equipment cannot solve the problem of gas entering the compressed air system through the drill core or the gas ejected from the drill core when replacing the drill rod. Utility Model Content

[0005] The technical problem to be solved by this invention is how to extract the gas ejected from the drill core.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] A blowout prevention device for drilling construction includes a construction pipe (1), a first branch pipe (2), a second branch pipe (3), and a connecting pipe (4); the construction pipe (1) is equipped with a first one-way valve (12), and the first branch pipe (2) and the second branch pipe (3) are spaced apart on the construction pipe (1), the first branch pipe (2) and the second branch pipe (3) are connected in parallel, the gas pressure that the second branch pipe (3) can pass through is lower than the gas pressure that the first branch pipe (2) can pass through, and the free ends of the first branch pipe (2) and the second branch pipe (3) are both set on the connecting pipe (4).

[0008] Beneficial effects: By setting up construction pipe fittings, first branch pipe fittings, second branch pipe fittings, and connecting pipes, and by installing a first one-way valve in the construction pipe fittings, the gas ejected from the drill core cannot pass through the first one-way valve. Instead, it can only enter the connecting pipe through the first or second branch pipe fitting for recovery. This prevents the gas ejected from the borehole from entering the mine's compressed air system or the roadway, thus avoiding endangering construction safety.

[0009] Furthermore, a gas extraction system is installed at the free end of the receiver (4).

[0010] Beneficial effects: By setting up a gas extraction system, gas ejected from the drill core can be recovered.

[0011] Furthermore, the construction fitting (1) includes a construction pipeline (11) and a first check valve (12), with the first check valve (12) fixed on the construction pipeline (11).

[0012] Furthermore, the construction pipe fitting (1) also includes a first gate valve (13), which is located near the input end of the construction pipeline (11).

[0013] Beneficial effect: By setting the first gate valve, when the drilling rig stops construction, the first gate valve can be closed to prevent gas from flowing through the construction pipeline.

[0014] Furthermore, the construction pipeline (11) is sequentially fixed with a first gate valve (13), a first check valve (12), a first branch fitting (2), and a second branch fitting (3) from the input end to the output end.

[0015] Furthermore, the first branch fitting (2) includes a first branch pipe (21), the input end of the first branch pipe (21) is connected to and fixed on the construction fitting (1), and the output end of the first branch pipe (21) is connected to and fixed on the connecting pipe (4).

[0016] Furthermore, the first branch pipe fitting (2) also includes a high-pressure relief valve (22), which is fixed on the first branch pipe (21).

[0017] Beneficial effect: By setting up a high-pressure overflow valve, if gas is ejected during normal drilling operations, the gas can enter the connecting pipe through the high-pressure overflow valve.

[0018] Furthermore, the second branch fitting (3) includes a second branch pipe (31) and a second gate valve (33). The input end of the second branch pipe (31) is connected to and fixed on the construction fitting (1), and the output end of the second branch pipe (31) is connected to and fixed on the connecting pipe (4). The second branch pipe (31) is fixed with the second gate valve (33).

[0019] Beneficial effect: By setting the second gate valve, the second gate valve is closed during normal drilling operations, preventing gas from flowing through the second branch pipeline.

[0020] Furthermore, the second branch fitting (3) also includes a second check valve (32), which is located near the output end of the second branch pipe (31).

[0021] Beneficial effect: By setting up a second check valve, gas can be prevented from entering the second branch pipeline from the main pipe.

[0022] Furthermore, the second branch fitting (3) also includes a two-position two-normally open valve (34) and a third branch pipe (35). A second gate valve (33), a third branch pipe (35), and a two-position two-normally open valve (34) are fixed sequentially along the input end to the output end of the second branch pipe (31). The input end of the third branch pipe (35) is connected to and fixed on the second branch pipe (31), and the output end of the third branch pipe (35) is connected to and fixed on the two-position two-normally open valve (34).

[0023] Beneficial effects: By setting up a two-position two-normally open valve and a third branch pipeline, gas can be supplied through the third branch pipeline to close the two-position two-normally open valve, thereby connecting the second branch pipeline and allowing gas to enter the pipe. When there is no gas, the two-position two-normally open valve is in the open state, preventing air from entering the pipe at the borehole. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the blowout prevention device for drilling construction according to Embodiment 1 of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example 1

[0027] like Figure 1 As shown, this embodiment provides a blowout prevention device for drilling construction, including a construction pipe fitting 1, a first branch pipe fitting 2, a second branch pipe fitting 3, a connecting pipe 4, and a gas extraction system (not shown).

[0028] like Figure 1As shown, the output end of construction pipe fitting 1 is connected to the drilling rig (not shown in the figure), and the input end of construction pipe fitting 1 is connected to high-pressure water (not shown in the figure). The first branch pipe fitting 2 and the second branch pipe fitting 3 are connected at intervals on the pipeline of construction pipe fitting 1 near the drilling rig. The first branch pipe fitting 2 and the second branch pipe fitting 3 are set in parallel. The free ends of the first branch pipe fitting 2 and the second branch pipe fitting 3 are both connected to the connecting pipe 4. The connecting pipe 4 is connected to the gas extraction system.

[0029] like Figure 1 As shown, the construction pipe fitting 1 includes a construction pipeline 11, a first check valve 12, and a first gate valve 13. The output end of the construction pipeline 11 is connected to the drilling rig, and the input end of the construction pipeline 11 is connected to high-pressure water. The first gate valve 13, the first check valve 12, the first branch fitting 2, and the second branch fitting 3 are fixed sequentially along the construction pipeline 11 from the input end to the output end.

[0030] like Figure 1 As shown, the first branch pipe fitting 2 includes a first branch pipe 21 and a high-pressure relief valve 22. The input end of the first branch pipe 21 is connected to and fixed on the construction pipe 11, and the output end of the first branch pipe 21 is connected to and fixed on the connecting pipe 4. The high-pressure relief valve 22 is fixed on the first branch pipe 21.

[0031] like Figure 1 As shown, the second branch pipe fitting 3 includes a second branch pipe 31, a second check valve 32, a second gate valve 33, a two-position two-normally open valve 34, and a third branch pipe 35. The input end of the second branch pipe 31 is connected and fixed to the construction pipe 11, and the output end of the second branch pipe 31 is connected and fixed to the connecting pipe 4. The second gate valve 33, the second check valve 32, the third branch pipe 35, and the two-position two-normally open valve 34 are sequentially fixed along the second branch pipe 31 from the input end to the output end. The input end of the third branch pipe 35 is connected and fixed to the second branch pipe 31, and the output end of the third branch pipe 35 is connected and fixed to the two-position two-normally open valve 34.

[0032] The gas extraction system is always on.

[0033] During normal drilling operations: the second gate valve 33 is closed, and high-pressure water enters the drill core through the construction pipeline 11 and then enters the borehole; when gas is ejected from the borehole and the gas pressure is greater than the pressure of the high-pressure water, the gas in the borehole enters the construction pipeline 11 through the drill core, and the gas is cut off at the first one-way valve 12; the gas enters the first branch pipeline 21, which opens the high-pressure overflow valve 22 (at which time the gas pressure is greater than the pressure of the high-pressure water), and the first branch pipeline 21 is open, and the high-pressure gas in the borehole enters the gas extraction system through the high-pressure overflow valve 22 and the connecting pipe 4;

[0034] When the drilling rig stops operating: At this time, the first gate valve 13 and the high-pressure overflow valve 22 are closed, and the second gate valve 33 is opened. No high-pressure water enters the construction pipeline 11. When the borehole gas is ejected, the gas pressure in the borehole increases. At this time, the gas pressure is low and cannot open the high-pressure overflow valve 22. The gas enters the second branch pipeline 31. The gas passes through the second gate valve 33, the second check valve 32, and the third branch pipeline 35 in sequence, causing the two-position two-normally open valve 34 to close, thereby connecting the second branch pipeline 31. Then, the high-pressure gas in the borehole enters the gas extraction system through the second branch pipeline 31 and the connecting pipe 4. The two-position two-normally open valve 34 is used to prevent the gas extraction system from drawing in air.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A blowout preventer for use in drilling operations, characterized in that The construction pipe fitting (1), the first branch pipe fitting (2), the second branch pipe fitting (3), and the connecting pipe (4) are included. The construction pipe fitting (1) is provided with a first one-way valve (12), and the first branch pipe fitting (2) and the second branch pipe fitting (3) are arranged on the construction pipe fitting (1) at intervals, wherein the first branch pipe fitting (2) and the second branch pipe fitting (3) are connected in parallel, the gas pressure that can be passed through the second branch pipe fitting (3) is lower than the gas pressure that can be passed through the first branch pipe fitting (2), and the free ends of the first branch pipe fitting (2) and the second branch pipe fitting (3) are arranged on the connecting pipe (4).

2. A blowout preventer according to claim 1, characterised in that: The free end of the connecting pipe (4) is provided with a gas extraction system.

3. A blowout preventer according to claim 1, characterized in that: The construction pipe fitting (1) includes a construction pipeline (11) and a first one-way valve (12), and the first one-way valve (12) is fixed on the construction pipeline (11).

4. A blowout preventer according to claim 3, characterised in that: The construction pipe fitting (1) further includes a first gate valve (13), and the first gate valve (13) is arranged close to the input end of the construction pipeline (11).

5. A blowout preventer according to claim 4, characterised in that: The first gate valve (13), the first one-way valve (12), the first branch pipe fitting (2), and the second branch pipe fitting (3) are fixed on the construction pipeline (11) in sequence from the input end to the output end.

6. The drilling well blowout preventer according to claim 1, characterized in that: The first branch pipe fitting (2) includes a first branch pipeline (21), and the input end of the first branch pipeline (21) is fixed in communication on the construction pipe fitting (1), and the output end of the first branch pipeline (21) is fixed in communication on the connecting pipe (4).

7. A blowout preventer according to claim 6, characterised in that: The first branch pipe fitting (2) further includes a high-pressure overflow valve (22), and the high-pressure overflow valve (22) is fixed on the first branch pipeline (21).

8. The drilling well blowout preventer according to claim 1, characterized in that: The second branch pipe fitting (3) includes a second branch pipeline (31) and a second gate valve (33), the input end of the second branch pipeline (31) is fixed in communication on the construction pipe fitting (1), the output end of the second branch pipeline (31) is fixed in communication on the connecting pipe (4), and the second gate valve (33) is fixed on the second branch pipeline (31).

9. A blowout preventer according to claim 8, characterised in that: The second branch pipe fitting (3) further includes a second one-way valve (32), and the second one-way valve (32) is arranged close to the output end of the second branch pipeline (31).

10. The drilling well blowout preventer according to claim 8, characterized in that: The second branch pipe fitting (3) further includes a two-position two-normal open valve (34) and a third branch pipeline (35), and the second gate valve (33), the third branch pipeline (35), and the two-position two-normal open valve (34) are fixed in sequence on the second branch pipeline (31) from the input end to the output end, the input end of the third branch pipeline (35) is fixed in communication on the second branch pipeline (31), and the output end of the third branch pipeline (35) is fixed in communication on the two-position two-normal open valve (34).

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