Blowout preventer for coal mine gas extraction drilling
By designing a blowout preventer, pressurized sealing gaskets and compression rings are used to ensure the airtightness of the borehole, solving the problem of gas eruption caused by the gap between the extraction pipe and the borehole. This enables the effective separation and transportation of gas and coal slag, improving the safety and efficiency of coal mining.
Patent Information
- Application Number
- CN202520459614.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-03-17
AI Technical Summary
During coal mine drilling and extraction, the gap between the extraction pipe and the borehole can cause gas eruptions, resulting in energy waste and affecting safety.
The blowout preventer consists of a blowout preventer body, a pressurized and sealed hollow rubber gasket, and a one-way valve assembly. The pressurized gasket contacts the borehole, and the squeeze ring and elastic components ensure airtightness. Combined with a cyclone separator, it separates gas and coal slag.
It effectively prevents gas leakage, improves the airtightness of the borehole, ensures the separation and transportation of gas and coal slag, avoids energy waste, and enhances mining safety.
Smart Images
Figure CN223707587U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal mine construction technology, specifically to a blowout prevention device for coal mine gas extraction boreholes. Background Technology
[0002] As the depth of mining increases, the amount of gas underground also increases, and the hazards of mine gas become increasingly greater with increasing depth, which seriously affects the safety of coal mining. In order to ensure efficient and safe mining of coal seams and prevent gas disasters, it is necessary to extract the gas from the coal seams in the mine using boreholes. During mining, extraction pipes are used to extract the gas inside the boreholes, and negative pressure is released using extraction equipment for open-hole extraction. However, when the extraction pipe extends into the borehole, gaps are generated between the borehole and the extraction pipe, causing a large amount of gas to still erupt through the gaps, resulting in energy waste. To address this, we propose a blowout prevention device for coal mine gas extraction boreholes. Utility Model Content
[0003] This invention provides a blowout prevention device for coal mine gas drainage boreholes, which solves the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a blowout preventer for coal mine gas drainage boreholes, comprising a blowout preventer body, a gas drainage pipe for gas discharge provided above the blowout preventer body, a discharge port for coal slag discharge provided below the blowout preventer body, and a blowout preventer pipe connected to one end of the blowout preventer body for connecting the blowout preventer body and the wellhead for guiding the borehole coal slag and gas.
[0005] The blowout preventer body has an internal cavity, which is connected to the discharge port, the extraction pipe and the blowout preventer pipe respectively.
[0006] The blowout preventer is provided with a pressurized and sealed hollow rubber gasket on its outer side.
[0007] The hollow rubber sealing gasket is divided into multiple parts, and a one-way valve assembly is provided at the connection of each part. The one-way valve assembly faces the blowout preventer body, and the one-way valve assembly closes when subjected to pressure facing the blowout preventer body.
[0008] The blowout preventer is provided with compression rings that abut against both ends of the hollow rubber gasket. The compression rings are annular and correspond to the hollow rubber gasket. The compression rings are slidably connected inside the blowout preventer. The compression rings can move linearly along the direction of the blowout preventer.
[0009] The end of the extrusion ring facing away from the hollow rubber sealing gasket is fixedly connected to an elastic component that abuts against the inside of the blowout preventer.
[0010] Preferably, the extraction pipe is equipped with a cyclone separator for separating gas and coal slag fragments;
[0011] The bottom of the extraction pipe is fixed to the top of the blowout preventer body, and a lower discharge channel with a connecting cavity is provided between them. The lower discharge channel is used to transport coal slag fragments.
[0012] Preferably, one end of the blowout preventer body is fixedly connected to a connecting pipe for communicating with the cavity, and the outer end of the connecting pipe extends into the interior of the blowout preventer and fits into the blowout preventer, and is flush with the inner wall of the blowout preventer.
[0013] The connecting pipe is fixedly connected to flanges on both the outside of the blowout preventer and the outside of the blowout preventer near the end of the connecting pipe. The connecting pipe and the flanges on the blowout preventer are connected by bolts.
[0014] Preferably, the elastic component is a spring.
[0015] Preferably, a pressurizing tube is installed inside the blowout preventer. One end of the pressurizing tube is fixed to the end of the hollow rubber sealing gasket near the blowout preventer body, and the other end of the pressurizing tube extends out of the blowout preventer and is connected to the pressure supply assembly.
[0016] Preferably, the pressure supply component is a water pump.
[0017] Preferably, the pressure supply component is a fan.
[0018] Preferably, the cyclone separator includes spiral blades and an exhaust pipe;
[0019] The spiral blades are fixedly installed in the middle section of the extraction pipe, and the spiral blades are used to guide the airflow.
[0020] The exhaust pipe is fixedly installed at the center of the tail end of the extraction pipe, and the diameter of the exhaust pipe is smaller than that of the tail end of the extraction pipe. The two ends of the exhaust pipe are located inside and outside the extraction pipe, respectively.
[0021] Preferably, the hollow rubber sealing gasket is provided with a spacer ring fixed to the blowout preventer at the separation point;
[0022] The spacer ring has a through hole with the same opening direction as the one-way valve assembly. The through hole is used to connect adjacent parts of the hollow rubber gasket, and a cross-shaped fixing bracket is fixedly connected to one end of the through hole away from the blowout preventer body.
[0023] The one-way valve assembly includes a spring plate, a valve plate, a valve stem, and a return spring. The valve stem is slidably connected to the middle of the cross-shaped fixing frame. The ends of the valve stem extend from both ends of the cross-shaped fixing frame and are fixed to the middle of the valve plate and the spring plate. A return spring is connected between the inner side of the spring plate and the cross-shaped fixing frame.
[0024] The valve plate has the same diameter as the through hole, and the spring plate has a smaller diameter than the valve plate. The spring plate is located at the end of the valve stem facing the blowout preventer.
[0025] This utility model has the following beneficial effects:
[0026] The blowout preventer for this coal mine gas drainage borehole expands by pressurizing the hollow rubber gasket, thus improving the airtightness between the gasket and the borehole. Furthermore, the hollow rubber gasket is divided into multiple sections, and the elastic components store energy, ensuring a tight seal between the blowout preventer and the borehole even in the event of a leak, thus achieving a double-protection effect. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of this utility model;
[0028] Figure 2 This is a cross-sectional structural diagram of the present invention;
[0029] Figure 3 This is a partial cross-sectional structural schematic diagram of the present invention;
[0030] Figure 4 This is a schematic diagram of the extrusion ring connection structure of this utility model;
[0031] Figure 5 This is a schematic diagram of the structure at point A of this utility model;
[0032] Figure 6 This is a schematic diagram of the cross-shaped fixing bracket connection of this utility model.
[0033] In the diagram: 1. Blowout preventer body; 2. Drain outlet; 3. Extraction pipe; 4. Connecting pipe; 5. Blowout preventer pipe; 6. Hollow rubber gasket; 7. Pressurization pipe; 8. Spiral blade; 9. Exhaust pipe; 10. Lower discharge channel; 11. Spring plate; 12. Compression ring; 13. Elastic component; 14. Cross bracket; 15. Valve plate; 16. Valve stem; 17. Return spring. Detailed Implementation
[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0035] Please see Figures 1 to 4A blowout preventer for a coal mine gas extraction borehole includes a blowout preventer body 1, an extraction pipe 3 for gas discharge is provided above the blowout preventer body 1, a discharge port 2 for coal slag discharge is provided below the blowout preventer body 1, and a blowout preventer pipe 5 is connected to one end of the blowout preventer body 1 to connect the blowout preventer body 1 and the wellhead for guiding the borehole coal slag and gas, thereby realizing the separation of gas and coal slag.
[0036] The blowout preventer body 1 has an internal cavity, which is connected to the discharge port 2, the extraction pipe 3 and the blowout preventer pipe 5 respectively.
[0037] The blowout preventer 5 is provided with a ring of pressurized and sealed hollow rubber gasket 6 on the outside. After the hollow rubber gasket 6 is inserted into the borehole, it is pressurized and deformed to come into contact with the inside of the borehole, thus making it well sealed and preventing gas leakage between the self-drilling hole and the blowout preventer 5.
[0038] The hollow rubber sealing gasket 6 is divided into multiple parts, and a one-way valve assembly is provided at the connection of each part. The one-way valve assembly faces the blowout preventer 1. When the one-way valve assembly is subjected to pressure facing the blowout preventer 1, it closes, thereby dividing the hollow rubber sealing gasket 6 into multiple parts. This ensures that if one part leaks, it will not affect the other parts, thus achieving a sealing effect.
[0039] The blowout preventer 5 is provided with compression rings 12 that abut against both ends of the hollow rubber gasket 6. The compression rings 12 are annular and correspond to the hollow rubber gasket 6. The compression rings 12 are slidably connected inside the blowout preventer 5. The compression rings 12 can move linearly along the direction of the blowout preventer 5. The compression rings 12 can move to compress the two ends of the hollow rubber gasket 6. In the event of leakage at both ends of the hollow rubber gasket 6, the compression rings 12 can squeeze out the hollow rubber gasket 6, so that the hollow rubber gasket 6 comes into contact with the borehole, further ensuring its airtightness.
[0040] The end of the compression ring 12 facing away from the hollow rubber gasket 6 is fixedly connected to an elastic component 13 that abuts against the inside of the blowout preventer 5. When the hollow rubber gasket 6 is pressurized, its elastic component 13 gradually stores energy and releases energy when the hollow rubber gasket 6 leaks.
[0041] Please see Figures 1 to 2 The extraction pipe 3 is equipped with a cyclone separator to separate gas and coal slag fragments, which can further separate the gas and coal slag, making the separation more complete.
[0042] The bottom of the extraction pipe 3 is fixed to the top of the blowout preventer body 1, and a lower discharge channel 10 is provided between them to connect the cavity. The lower discharge channel 10 is used to transport coal slag fragments, so that the coal slag separated in the extraction pipe 3 can re-enter the cavity and fall from the discharge port 2.
[0043] Please see Figures 1 to 3 One end of the blowout preventer body 1 is fixedly connected to a connecting pipe 4 for connecting the cavity. The outer end of the connecting pipe 4 extends into the interior of the blowout preventer 5 and is fitted with the blowout preventer 5, and is aligned with the inner wall of the blowout preventer 5. This can extend the length of the connection gap between the connecting pipe 4 and the blowout preventer 5, making their airtightness better.
[0044] Flanges are fixedly connected to both the outer side of the connecting pipe 4 and the outer side of the blowout preventer 5 near the end of the connecting pipe 4. The flanges on the connecting pipe 4 and the blowout preventer 5 are connected by bolts, so that the blowout preventer 5 can be replaced smoothly.
[0045] Please see Figures 1 to 4 The elastic component 13 is a spring.
[0046] Please see Figures 1 to 4 The blowout preventer 5 has a pressurization tube 7 installed inside. One end of the pressurization tube 7 is fixed to the end of the hollow rubber gasket 6 near the blowout preventer body 1, and the other end of the pressurization tube 7 extends out of the blowout preventer 5 and is connected to the pressure supply assembly. Through the pressure supply assembly, the interior of the hollow rubber gasket 6 can be pressurized by the pressurization tube 7.
[0047] Please see Figures 1 to 4 The pressure supply component is a water pump.
[0048] Please see Figures 1 to 4 The pressure supply component is a fan.
[0049] Please see Figures 1 to 3 The cyclone separator includes spiral blades 8 and an exhaust pipe 9;
[0050] The spiral blade 8 is fixedly installed in the middle section of the extraction pipe 3. The spiral blade 8 is used to guide the airflow, so that the gas and coal dust tangentially pass through the extraction pipe 3 as the airflow passes through the spiral blade 8, forming a high-speed rotating flow.
[0051] The exhaust pipe 9 is fixedly installed at the center of the tail end of the extraction pipe 3, and the diameter of the exhaust pipe 9 is smaller than that of the tail end of the extraction pipe 3. The two ends of the exhaust pipe 9 are located inside and outside the extraction pipe 3, respectively, so that the gas can be discharged from the middle through the exhaust pipe 9. Under the action of centrifugal force, the slag and ash fragments are thrown to the outer wall due to their large mass and slide down the wall into the lower discharge channel 10.
[0052] Please see Figures 1 to 6 The hollow rubber sealing gasket 6 is provided with a spacer ring fixed to the blowout preventer 5 at the separation point;
[0053] A through hole with the same opening direction as the one-way valve assembly is passed through the spacer ring. The through hole is used to connect adjacent parts of the hollow rubber gasket 6, and a cross bracket 14 is fixedly connected to one end of the through hole away from the blowout preventer body 1.
[0054] The one-way valve assembly includes a spring plate 11, a valve plate 15, a valve stem 16, and a return spring 17. The valve stem 16 is slidably connected to the middle of the cross-shaped fixing frame 14. The ends of the valve stem 16 extend from both ends of the cross-shaped fixing frame 14 and are fixed to the middle of the valve plate 15 and the spring plate 11. The return spring 17 is connected between the inner side of the spring plate 11 and the cross-shaped fixing frame 14.
[0055] The valve plate 15 has the same diameter as the through hole, and the spring plate 11 has a smaller diameter than the valve plate 15. The spring plate 11 is located at the end of the valve stem 16 facing the blowout preventer body 1, so that after the valve plate 15 and the spring plate 11 move, they can open the through hole in one direction, and under the action of the spring force of the return spring 17, the spring plate 11 and the valve plate 15 can automatically close the through hole.
[0056] In summary, the blowout preventer (BOP) for this coal mine gas drainage borehole operates by inserting the BOP pipe 5 into the borehole. Pressure is then supplied to the hollow rubber gasket 6 via an external pressure supply assembly and a pressure charging pipe 7. During pressure supply, the one-way valve assembly opens, allowing all parts of the hollow rubber gasket 6 to be pressurized. After pressurization, the one-way valve assembly closes. The pressurization of the hollow rubber gasket 6 ensures a tighter contact between it and the inner wall of the borehole, guaranteeing airtightness. Even if a portion of the hollow rubber gasket 6 leaks, the remaining parts of the gasket 6 maintain a tight seal. In the event of a leak at the part of the hollow rubber gasket 6 furthest from the BOP body 1, the elastic component 13 releases pressure. The squeezing ring 12 continuously pressurizes the gas, preventing excessive pressure difference that could cause the one-way valve to open. The squeezing ring 12 also pushes the leaking hollow rubber sealing gasket 6 outwards to contact the borehole, further ensuring its airtightness. Coal slag and gas enter the cavity inside the blowout preventer body 1. Large pieces of coal slag fall from the discharge port 2, while fragmented coal slag, along with gas, is extracted from the extraction pipe 3. After the gas enters the extraction pipe 3, it forms a swirling flow under the airflow guidance of the spiral blades 8. The gas and fragmented coal slag move tangentially within the extraction pipe 3, forming a high-speed rotating flow. The rotating gas generates centrifugal force, and the large mass of the fragmented coal slag is thrown towards the outer wall, sliding down the wall into the lower discharge channel 10 and exiting from the discharge port 2. The gas is discharged from the exhaust pipe 9.
[0057] 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, and 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; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0058] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A blowout preventer for a coal mine gas extraction borehole, comprising a blowout preventer body (1), an extraction pipe (3) for gas discharge is provided above the blowout preventer body (1), a discharge port (2) for coal slag discharge is provided below the blowout preventer body (1), and a blowout preventer pipe (5) for connecting the blowout preventer body (1) and the wellhead is connected to one end of the blowout preventer body (1) for guiding the borehole coal slag and gas; The blowout preventer body (1) has an internal cavity, which is connected to the drain port (2), the extraction pipe (3) and the blowout preventer pipe (5) respectively. Its features are: The blowout preventer (5) is provided with a ring of pressurized and sealed hollow rubber gasket (6) on the outside; The hollow rubber sealing gasket (6) is divided into multiple parts, and a one-way valve assembly is provided at the connection of each part. The one-way valve assembly faces the blowout preventer (1), and the one-way valve assembly closes when subjected to pressure facing the blowout preventer (1). The blowout preventer (5) is provided with compression rings (12) that abut against both ends of the hollow rubber gasket (6). The compression rings (12) are annular and correspond to the hollow rubber gasket (6). The compression rings (12) are slidably connected inside the blowout preventer (5). The compression rings (12) can move linearly along the direction of the blowout preventer (5). The end of the compression ring (12) facing away from the hollow rubber sealing gasket (6) is fixedly connected to an elastic component (13) that abuts against the inside of the blowout preventer (5).
2. The blowout prevention device for coal mine gas drainage boreholes according to claim 1, characterized in that: The extraction pipe (3) is equipped with a cyclone separator inside, which is used to separate gas and coal slag fragments; The bottom of the extraction pipe (3) is fixed to the top of the blowout preventer body (1), and a lower discharge channel (10) with a connecting cavity is provided between them. The lower discharge channel (10) is used to transport coal slag fragments.
3. The blowout prevention device for coal mine gas drainage boreholes according to claim 2, characterized in that: One end of the blowout preventer body (1) is fixedly connected to a connecting pipe (4) for communicating with the cavity. The outer end of the connecting pipe (4) extends into the interior of the blowout preventer (5) and fits into the blowout preventer (5), and is aligned with the inner wall of the blowout preventer (5). The connecting pipe (4) is fixedly connected to a flange on the outside of the blowout preventer (5) and on the outside of the blowout preventer (5) near the end of the connecting pipe (4). The flanges on the connecting pipe (4) and the blowout preventer (5) are connected by bolts.
4. The blowout prevention device for coal mine gas drainage boreholes according to claim 2, characterized in that: The elastic component (13) is a spring.
5. The blowout prevention device for coal mine gas drainage boreholes according to claim 2, characterized in that: The blowout preventer (5) has a pressurizing tube (7) installed inside. One end of the pressurizing tube (7) is fixed to the end of the hollow rubber sealing gasket (6) near the blowout preventer body (1), and the other end of the pressurizing tube (7) extends out of the blowout preventer (5) and is connected to the pressure supply assembly.
6. The blowout prevention device for coal mine gas drainage boreholes according to claim 5, characterized in that: The pressure supply component is a water pump.
7. The blowout prevention device for coal mine gas drainage boreholes according to claim 5, characterized in that: The pressure supply component is a fan.
8. The blowout prevention device for coal mine gas drainage boreholes according to claim 2, characterized in that: The cyclone separator includes spiral blades (8) and an exhaust pipe (9); The spiral blade (8) is fixedly installed in the middle section of the extraction pipe (3), and the spiral blade (8) is used to guide the airflow; The exhaust pipe (9) is fixedly installed at the center of the tail end of the extraction pipe (3), and the diameter of the exhaust pipe (9) is smaller than that of the tail end of the extraction pipe (3). The two ends of the exhaust pipe (9) are located inside and outside the extraction pipe (3), respectively.
9. The blowout prevention device for coal mine gas drainage boreholes according to claim 8, characterized in that: The hollow rubber sealing gasket (6) is provided with a spacer ring fixed to the blowout preventer (5) at the separation point; The spacer ring has a through hole with the same opening direction as the one-way valve assembly. The through hole is used to connect adjacent parts of the hollow rubber gasket (6), and a cross bracket (14) is fixedly connected to one end of the through hole away from the blowout preventer (1). The one-way valve assembly includes a spring plate (11), a valve plate (15), a valve stem (16), and a return spring (17). The valve stem (16) is slidably connected to the middle of the cross-shaped fixing frame (14). The ends of the valve stem (16) extend from both ends of the cross-shaped fixing frame (14) and are fixed to the middle of the valve plate (15) and the spring plate (11). The return spring (17) is connected between the inner side of the spring plate (11) and the cross-shaped fixing frame (14). The valve plate (15) has the same diameter as the through hole, and the spring plate (11) has a smaller diameter than the valve plate (15). The spring plate (11) is located at the end of the valve stem (16) facing the blowout preventer (1).