A multipurpose blowout preventer for horizontal drilling under atmospheric pressure

Abstract

This utility model discloses a multi-purpose atmospheric pressure horizontal borehole blowout prevention device, relating to the technical field of coal mine gas control equipment. Specifically, it is a multi-purpose atmospheric pressure horizontal borehole blowout prevention device, including a drill string, a self-sealing device, a flow obstructor, and a tee pipe. The self-sealing device, flow obstructor, and tee pipe are connected in series and are detachable. The drill string passes through the self-sealing device, flow obstructor, and tee pipe sequentially. This utility model, by setting up a flow obstructor, uses a flow obstruction ball to fill the annular space outside the drill string, forming a relatively sealed space, effectively preventing gas from ejecting from the gap between the drill string and the device. When a large amount of gas is ejected from the borehole, pressurized static water can be connected through a static water pipe to form a liquid seal effect, further preventing gas from ejecting from the flow obstructor and self-sealing device, thereby significantly reducing the risk of gas leakage and ensuring the safety of construction personnel.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mine gas control equipment, specifically a multi-purpose atmospheric pressure horizontal borehole blowout prevention device. Background Technology

[0002] In underground coal mine drilling operations, the safe management of gas has always been a critical issue. Existing technologies, such as patent CN111636834A, describe a gas and slag removal system and method for underground coal mine drilling with blowout preventers. This system completely controls the drilling process within a closed device. The blowout preventer is first driven into the coal wall, and the drill bit and drill rod pass through the preventer. During drilling, the gas venting device discharges the coal dust generated during drilling into a gas-liquid separator, preventing workers from inhaling coal dust and purifying the drilling environment. Simultaneously, the gas generated during drilling is discharged into the underground coal mine gas extraction pipeline system to prevent blowouts and prevent borehole gas from entering the roadway and triggering a gas exceeding the limit alarm. However, this technical solution still has some limitations in practical applications.

[0003] First, existing blowout prevention devices primarily rely on sealing devices and gas-liquid separators to control the emission of gas and coal dust. When drilling in high-gas areas, this structure may experience a decrease in the sealing performance of the sealing device due to excessive gas pressure, leading to a risk of gas leakage. Second, existing technologies have limited applicability to drilling tools, typically only suitable for smooth drills with a uniform outer diameter. They cannot effectively seal drills with grooves, causing gas to erupt from the gap between the drill and the device, endangering the safety of construction workers.

[0004] Therefore, in view of the above-mentioned problems in the prior art, the present invention proposes a multi-purpose atmospheric pressure horizontal borehole blowout preventer, which aims to solve the technical problems of high gas leakage risk and limited applicability of drilling tools in the prior art, and provide a safer, more efficient and more applicable blowout preventer. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a multi-purpose atmospheric pressure horizontal drilling blowout prevention device, which solves the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-purpose atmospheric pressure horizontal drilling blowout prevention device, comprising a drill bit, a self-sealing device, a flow obstructor, and a tee pipe, wherein the self-sealing device, the flow obstructor, and the tee pipe are connected in series and are detachable from each other; the drill bit passes through the self-sealing device, the flow obstructor, and the tee pipe in sequence; the flow obstructor comprises a flow obstruction cylinder, a ball injector, and a static pressure water pipe, wherein the flow obstruction cylinder is a hollow cylindrical structure, the ball injector is installed on the outer wall of the flow obstruction cylinder and the two are connected, the ball injector contains multiple flow obstruction balls, and the ball injector drives each flow obstruction ball into the flow obstruction cylinder; the static pressure water pipe is fixedly installed on the outer wall of the flow obstruction cylinder, and the fluid medium outlet end of the static pressure water pipe is connected to the inside of the flow obstruction cylinder.

[0009] Optionally, the flow obstructor further includes a third flange and a fourth flange, which are respectively fixedly installed at both ends of the flow obstruction cylinder.

[0010] Optionally, the flow obstructor further includes a ball outlet pipe and a valve. The ball outlet pipe is fixedly installed on the outer wall of the flow obstruction cylinder and the two are connected. The valve is fixedly installed at the end of the ball outlet pipe away from the flow obstruction cylinder.

[0011] Optionally, a pressure gauge is fixedly installed on the flow-blocking cylinder to detect the pressure of the fluid medium inside the flow-blocking cylinder.

[0012] Optionally, the ball injector includes a ball injecting tube, a push rod, and a handle. One end of the ball injecting tube is fixedly installed to the wall of the flow-blocking cylinder. One end of the push rod is inserted into the other end of the ball injecting tube and is threadedly connected to the ball injecting tube. The handle is fixedly installed at the end of the push rod away from the ball injecting tube. When the push rod is threaded into the ball injecting tube, it pushes the flow-blocking ball out of the ball injecting tube.

[0013] Optionally, the self-sealing device includes a first flange, a self-sealing cylinder, a second flange, and a rubber core. The self-sealing cylinder is a hollow cylindrical structure. The first flange and the second flange are respectively fixedly installed at both ends of the self-sealing cylinder. The rubber core is coaxially installed inside the self-sealing cylinder. The second flange and the third flange are detachably installed by multiple bolts.

[0014] Optionally, the tee pipe is Y-shaped and includes a fifth flange, a main pipe, a sixth flange, and a branch pipe. The fifth flange and the sixth flange are fixedly installed at both ends of the main pipe, and the branch pipe is fixedly installed on the outer side wall of the main pipe and the two are connected. The fifth flange and the fourth flange are detachably installed by multiple bolts.

[0015] (III) Beneficial Effects

[0016] This utility model provides a multi-purpose blowout preventer for horizontal borehole drilling at atmospheric pressure, which has the following beneficial effects:

[0017] 1. This utility model, by setting up a flow obstructor, uses a flow obstruction ball to fill the annular space outside the drill bit, forming a relatively sealed space, effectively preventing gas from spraying out from the gap between the drill bit and the device. When a large amount of gas is spraying out from inside the borehole, pressurized water can be connected through a static water pipe to form a liquid seal effect, further preventing gas from spraying out from the flow obstruction cylinder and self-sealing device, thereby significantly reducing the risk of gas leakage and ensuring the safety of construction personnel.

[0018] 2. This utility model's self-sealing device, through its inner and outer cylinder structure and rubber core design, can adapt to drill tools with uniform and smooth outer diameters. Simultaneously, the flow-blocking device's design allows it to be used with drill tools that have grooves. By injecting flow-blocking balls into the inner cavity of the flow-blocking cylinder through a ball injector, the flow-blocking balls fill the annular space outside the drill tool. Even if the drill tool surface has grooves, the pressure applied by the flow-blocking balls can create a relatively sealed space, effectively preventing gas ejection. This design greatly improves the device's applicability to different drill tools, enabling its widespread application in various coal mine underground drilling operations. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention during its implementation;

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 4 This is a cross-sectional view of the flow restrictor in this utility model;

[0024] Figure 5 This is a three-dimensional structural diagram of the self-sealing device in this utility model;

[0025] Figure 6 This is a three-dimensional structural diagram of the flow restrictor in this utility model;

[0026] Figure 7 This is a three-dimensional structural diagram of the tee pipe in this utility model.

[0027] In the diagram: 1. Drilling tool; 2. Self-sealing device; 201. First flange; 202. Self-sealing cylinder; 203. Second flange; 204. Rubber core; 3. Flow restrictor; 301. Third flange; 302. Flow restrictor cylinder; 303. Fourth flange; 304. Pressure gauge; 305. Static water pipe; 306. Ball outlet pipe; 307. Valve; 308. Ball injection pipe; 309. Push rod; 310. Handle; 311. Flow restrictor ball; 4. T-junction pipe; 401. Fifth flange; 402. Main pipe; 403. Sixth flange; 404. Branch pipe; 5. Tunnel wall. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying anything.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0030] Please see Figures 1 to 7 This utility model provides a technical solution: a multi-purpose atmospheric pressure horizontal drilling blowout preventer, including a drill bit 1. The multi-purpose atmospheric pressure horizontal drilling blowout preventer also includes a self-sealing device 2, a flow obstructor 3, and a tee pipe 4. The self-sealing device 2, the flow obstructor 3, and the tee pipe 4 are connected in series and can be detachably installed. The drill bit 1 passes through the self-sealing device 2, the flow obstructor 3, and the tee pipe 4 in sequence.

[0031] The self-sealing device 2 achieves a seal by clamping the outer wall of the drill bit 1, preventing gas leakage. The flow deflector 3 is used to prevent gas from escaping. The three-way pipe 4 controls the fluid direction, guiding gas, coal dust, etc., into the blowout preventer box. All components are detachable for easy maintenance and replacement. The drill bit 1 penetrates through these components, ensuring safe and efficient drilling operations. In actual implementation, the end of the three-way pipe 4 furthest from the flow deflector 3 is fixedly installed on the tunnel wall 5 inside the coal mine. After penetrating the self-sealing device 2, the flow deflector 3, and the three-way pipe 4, the drill bit 1 drills into the tunnel wall 5 of the coal mine.

[0032] The flow obstructor 3 includes a flow obstruction cylinder 302, a ball injector, and a static pressure water pipe 305. The flow obstruction cylinder 302 is a hollow cylindrical structure. The ball injector is installed on the outer wall of the flow obstruction cylinder 302 and the two are connected. The ball injector contains multiple flow obstruction balls 311. The ball injector drives each flow obstruction ball 311 into the flow obstruction cylinder 302.

[0033] The static pressure water pipe 305 is fixedly installed on the outer wall of the flow-blocking cylinder 302, and the fluid medium outlet end of the static pressure water pipe 305 is connected to the inside of the flow-blocking cylinder 302.

[0034] The flow-blocking cylinder 302 is a hollow structure that can accommodate the flow-blocking ball 311. A ball injector is installed on the outer wall of the flow-blocking cylinder 302, and injects the flow-blocking ball 311 into the cylinder 302 via an internal push rod 309, filling the annular space outside the drill bit 1 to form a relatively sealed environment and prevent gas leakage. A static pressure water pipe 305 is installed on the outer wall of the flow-blocking cylinder 302, with its fluid medium outlet connected to the interior of the cylinder 302. When the gas pressure inside the borehole is too high, water with a certain pressure can be injected through the static pressure water pipe 305 to form a liquid seal effect, further preventing gas leakage and ensuring drilling safety. The flow-blocking ball 311 may be made of, but is not limited to, a wear-resistant rubber material.

[0035] Specifically, the flow obstructor 3 also includes a third flange 301 and a fourth flange 303, which are respectively fixedly installed at both ends of the flow obstruction cylinder 302. The drill bit 1 passes through the central holes of the third flange 301 and the fourth flange 303. The inner diameter of the third flange 301 or the fourth flange 303 is larger than the outer diameter of the drill bit 1, and half of the difference between the inner diameter of the third flange 301 or the fourth flange 303 and the outer diameter of the drill bit 1 (i.e., Figure 4 The intermediate distance A) is less than the diameter of the flow-blocking ball 311, thereby preventing the flow-blocking ball 311 from running out of the flow-blocking device 3. The inner diameter of the flow-blocking cylinder 302 is larger than the inner diameter of the third flange 301 or the fourth flange 303, and the cavity formed inside the flow-blocking cylinder 302 is the flow-blocking cavity.

[0036] In this design, the inner diameter of the third flange 301 or the fourth flange 303 is larger than the outer diameter of the drill string 1, but half of the difference is less than the diameter of the flow-blocking ball 311, preventing the flow-blocking ball 311 from escaping from the flange. The inner diameter of the flow-blocking cylinder 302 is larger than the inner diameter of the flange, forming a flow-blocking cavity. During operation, the flow-blocking ball 311 is injected into the flow-blocking cavity, filling the annular space between the drill string 1 and the flow-blocking cylinder 302, forming a seal, which serves to block and turbulent the flow, preventing gas from erupting and ensuring the safety of drilling operations.

[0037] Specifically, the flow obstructor 3 also includes a ball outlet pipe 306 and a valve 307. The ball outlet pipe 306 is fixedly installed on the outer wall of the flow obstructor 302 and the two are connected. The valve 307 is fixedly installed at the end of the ball outlet pipe 306 away from the flow obstructor 302.

[0038] The flow restrictor 3 is equipped with a ball outlet pipe 306 and a valve 307. During operation, the valve 307 is closed to ensure that the flow restrictor ball 311 remains inside the flow restrictor cylinder 302, maintaining a sealing effect. After drilling is completed, the valve 307 is opened to discharge the flow restrictor ball 311 through the ball outlet pipe 306, and the flow restrictor cylinder 302 is cleaned to prepare for the next operation.

[0039] Specifically, a pressure gauge 304 is fixedly installed on the flow-blocking cylinder 302, and the pressure gauge 304 detects the pressure of the fluid medium inside the flow-blocking cylinder 302.

[0040] The flow-blocking cylinder 302 is equipped with a pressure gauge 304 for real-time monitoring of the pressure of the fluid medium inside the cylinder. By observing the reading of the pressure gauge 304, operators can promptly understand the pressure changes inside the flow-blocking cylinder and ensure that appropriate measures are taken when the gas pressure is too high, such as adjusting the static pressure water injection rate, to ensure the safety and stability of the drilling operation.

[0041] Specifically, the ball injector includes a ball injection tube 308, a push rod 309, and a handle 310. One end of the ball injection tube 308 is fixedly installed to the wall of the baffle cylinder 302. One end of the push rod 309 is inserted into the other end of the ball injection tube 308, and the push rod 309 is threadedly connected to the ball injection tube 308. The handle 310 is fixedly installed at the end of the push rod 309 away from the ball injection tube 308. When the push rod 309 is screwed into the ball injection tube 308, it pushes the baffle ball 311 out of the ball injection tube 308.

[0042] During operation, the operator rotates handle 310, causing push rod 309 to screw into injection tube 308 along the thread. This pushes choke ball 311 out of injection tube 308 and into choke cylinder 302, filling the annular space between drill bit 1 and choke cylinder 302 to form a seal, preventing gas ejection and ensuring drilling safety. Push rod 309 and handle 310, by rotating on injection tube 308, move choke ball 311.

[0043] More specifically, the self-sealing device 2 includes a first flange 201, a self-sealing cylinder 202, a second flange 203, and a rubber core 204. The self-sealing cylinder 202 is a hollow cylindrical structure. The first flange 201 and the second flange 203 are respectively fixedly installed at both ends of the self-sealing cylinder 202. The rubber core 204 is coaxially installed inside the self-sealing cylinder 202. The second flange 203 and the third flange 301 are detachably installed by multiple bolts.

[0044] The self-sealing device 2 consists of a first flange 201, a self-sealing cylinder 202, a second flange 203, and a rubber core 204. The self-sealing cylinder 202 is a hollow cylinder, with the first flange 201 and the second flange 203 installed at its two ends respectively. The rubber core 204 is coaxially installed inside the cylinder. The self-sealing cylinder 202 actually consists of an inner cylinder and an outer cylinder, which are threaded together. Rotation of the threads between the inner and outer cylinders compresses the internal cavity, thus squeezing the rubber core 204. The second flange 203 is bolted to the third flange 301 for easy disassembly. During operation, the drill bit 1 is inserted into the self-sealing device 2, and the rotation of the outer cylinder squeezes the rubber core 204, causing it to grip the drill bit 1 tightly, sealing the annular space outside the drill bit, preventing gas leakage, and ensuring drilling safety. The self-sealing device 2 can also be a commonly available self-sealing device on the market.

[0045] More specifically, the tee pipe 4 is Y-shaped and includes a fifth flange 401, a main pipe 402, a sixth flange 403, and a branch pipe 404. The fifth flange 401 and the sixth flange 403 are fixedly installed at both ends of the main pipe 402, and the branch pipe 404 is fixedly installed on the outer side wall of the main pipe 402 and the two are connected. The fifth flange 401 and the fourth flange 303 can be detached and installed by multiple bolts.

[0046] The T-junction pipe 4 controls the fluid direction. One end of the main pipe 402 is fixedly installed to the roadway wall 5, allowing the main pipe 402 to connect to the borehole. The other end of the main pipe 402 is connected to the flow preventer 3. The outlet of the branch pipe 404 is connected to the blowout preventer box, meaning the medium outlet end of the branch pipe 404 is fixedly installed to the blowout preventer box to prevent the medium from spraying out. The T-junction pipe 4 can separate and discharge media such as gas, coal slag, and water through the branch pipe 404. The branch pipe 404 is funnel-shaped, reducing the risk of blockage at the outlet of the branch pipe 404 and ensuring safe and efficient drilling operations.

[0047] The blowout preventer is existing equipment, and its structure and working principle will not be described in detail here.

[0048] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-purpose atmospheric pressure horizontal drilling blowout prevention device, comprising a drilling tool (1), characterized in that: It also includes a self-sealing device (2), a flow obstructor (3), and a three-way pipe (4), wherein the self-sealing device (2), the flow obstructor (3), and the three-way pipe (4) are connected in series and can be detached from each other; the drill bit (1) passes through the self-sealing device (2), the flow obstructor (3), and the three-way pipe (4) in sequence. The flow obstructor (3) includes a flow obstruction cylinder (302), a ball injector, and a static pressure water pipe (305). The flow obstruction cylinder (302) is a hollow cylindrical structure. The ball injector is installed on the outer side wall of the flow obstruction cylinder (302) and the two are connected. The ball injector contains multiple flow obstruction balls (311). The ball injector drives each flow obstruction ball (311) into the flow obstruction cylinder (302). The static pressure water pipe (305) is fixedly installed on the outer wall of the flow-blocking cylinder (302), and the fluid medium outlet end of the static pressure water pipe (305) is connected to the inside of the flow-blocking cylinder (302).

2. The multi-purpose atmospheric pressure horizontal drilling blowout preventer according to claim 1, characterized in that: The flow obstructor (3) also includes a third flange (301) and a fourth flange (303), which are respectively fixedly installed at both ends of the flow obstructor (302).

3. The multi-purpose atmospheric pressure horizontal drilling blowout preventer according to claim 1, characterized in that: The flow obstructor (3) also includes a ball outlet pipe (306) and a valve (307). The ball outlet pipe (306) is fixedly installed on the outer side wall of the flow obstructor (302) and the two are connected. The valve (307) is fixedly installed at the end of the ball outlet pipe (306) away from the flow obstructor (302).

4. The multi-purpose atmospheric pressure horizontal drilling blowout preventer according to claim 1, characterized in that: A pressure gauge (304) is fixedly installed on the flow-blocking cylinder (302), and the pressure gauge (304) detects the pressure of the fluid medium inside the flow-blocking cylinder (302).

5. A multi-purpose atmospheric pressure horizontal drilling blowout preventer according to claim 1, characterized in that: The ball injector includes a ball injector tube (308), a push rod (309), and a handle (310). One end of the ball injector tube (308) is fixedly installed on the wall of the flow-blocking cylinder (302). One end of the push rod (309) is inserted into the other end of the ball injector tube (308), and the push rod (309) is threadedly connected to the ball injector tube (308). The handle (310) is fixedly installed on the end of the push rod (309) away from the ball injector tube (308). When the push rod (309) is threaded into the ball injector tube (308), it pushes the flow-blocking ball (311) out of the ball injector tube (308).

6. A multi-purpose atmospheric pressure horizontal drilling blowout preventer according to claim 2, characterized in that: The self-sealing device (2) includes a first flange (201), a self-sealing cylinder (202), a second flange (203), and a rubber core (204). The self-sealing cylinder (202) is a hollow cylindrical structure. The first flange (201) and the second flange (203) are respectively fixedly installed at both ends of the self-sealing cylinder (202). The rubber core (204) is coaxially installed inside the self-sealing cylinder (202). The second flange (203) and the third flange (301) are detachably installed by multiple bolts.

7. A multi-purpose atmospheric pressure horizontal drilling blowout preventer according to claim 2, characterized in that: The tee pipe (4) is Y-shaped in general. The tee pipe (4) includes a fifth flange (401), a main pipe (402), a sixth flange (403), and a branch pipe (404). The fifth flange (401) and the sixth flange (403) are respectively fixedly installed at both ends of the main pipe (402). The branch pipe (404) is fixedly installed on the outer side wall of the main pipe (402) and the two are connected. The fifth flange (401) and the fourth flange (303) are detachably installed by multiple bolts.

Images