Heavy type intelligent blowout prevention hole device for hydraulic jetting

Abstract

The utility model discloses a heavy type intelligent blowout prevention device for hydraulic jet, and relates to the technical field of blowout prevention during coal drilling, a four-way pipe is internally provided with a slag baffle and a holding unit for a drill rod to pass through, when the blowout occurs, the pressure of gas in a drill hole is increased, and the drill rod can pass through the slag baffle. Gas in a drill hole is diffused to the position near the drill hole through a gap between the drill rod and the four-way pipe, when the concentration of methane near the drill hole reaches a preset threshold value of the methane sensor, the methane sensor sends an electric signal to the PLC control cabinet, the PLC control cabinet sends an electric signal to the electromagnetic valve, and the electromagnetic valve controls the holding unit to hold the drill rod tightly. The path that the gas in the drill hole continuously escapes into the roadway through the gap between the drill rod and the four-way pipe is cut off, and the technical problem that normal work in the roadway is affected due to the fact that the gas in the drill hole continuously escapes through the gap between the drill rod and the four-way pipe is solved; and meanwhile, the drill rod is quickly braked through secondary clamping of the holding unit, and a gap between the drill rod and the four-way pipe is cut off.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of the anti-blowout hole during coal drilling, in particular to a heavy -duty intelligent anti -blowout hole device for hydraulic jet. BACKGROUND

[0002] Coal is the main energy source in China, supporting the sustained and rapid development of the national economy. However, with the increasing depth of mine exploitation, the gas content and pressure of coal seams increase dramatically. In order to control the gas in coal seams, water jetting and water jet cutting are often used in conjunction with anti-outburst drilling to increase the permeability of the surrounding coal body. However, the fluctuation of the surrounding coal body during the permeability-increasing process has a significant impact on the drilling, which can easily cause rapid release of gas in the hole and form a gas gushing flow. The gas gushing flow makes it difficult for coal dust to be discharged smoothly, resulting in a sudden release of gas into the roadway, which can easily cause gas overrun in the roadway and threaten the safety of workers and equipment near the drilling site. In order to avoid the problem of gas overrun in the roadway and threaten the safety of workers and equipment near the drilling site, an automatic control system is usually used to detect the gas content in the roadway.

[0003] For example, a Chinese patent with application publication number CN114673549A discloses a drilling anti-blowout automatic control system and method. The system includes a deslagging water tank, an anti-blowout tank, a drilling machine, a PLC intelligent control cabinet, a network switch, and a coal mine information management and control platform. A hole mouth anti-blowout device is arranged at the selected drilling position. The hole mouth anti-blowout device is provided with a pressure sensor connected to the PLC intelligent control cabinet via a wire near the connection between the hole mouth sleeve and the casing. An electric gate valve connected to the PLC intelligent control cabinet via a wire is arranged on the inlet pipe connected to the deslagging water tank and the gas extraction main pipeline. The pressure sensor and the electric gate valve transmit information through the PLC intelligent control cabinet. When gas is ejected, the electric gate valve can act in time to quickly discharge the ejected gas. The accident record is transmitted to the coal mine information management and control platform through the network switch. This solves the problem of slow reaction speed of existing drilling anti-blowout technology, which can easily cause gas overrun in the drilling site.

[0004] According to paragraph 0015 of the specification of the above-mentioned disclosure, if drilling blowout or other dynamic phenomena occur, the pressure in the tee pipe of the hole mouth anti-blowout device will increase. When the pressure increases by 50kPa within a short period of time, the pressure sensor will send an alarm signal to the PLC control box, so that the PLC control box controls the electric gate valve on the extraction pipeline to open completely, allowing gas to be discharged from the main pipeline, thereby avoiding gas overrun in the drilling site due to the large amount of gas ejected. At the same time, the ejected residue and water can be discharged to the anti-blowout tank through the lower residue discharge pipe. When the value of the pressure sensor decreases to normal, the pressure sensor sends a reset signal to the PLC control box, so that the PLC control box controls the electric gate valve to reset, ensuring the normal operation of the entire extraction system.

[0005] However, the technology of the above-mentioned disclosure has a problem in actual use, that is, when the jet hole occurs, even if the PLC control system sends an alarm signal, the gas in the drilling hole will escape into the roadway through the gap between the drill rod and the cross pipe, causing the gas content in the roadway to still increase after the alarm signal is sent, the sensing value of the methane sensor will still increase, affecting the work in the roadway, and being not conducive to the safety production of the coal mine. SUMMARY

[0006] In view of the deficiencies in the background art, the utility model provides a heavy -duty intelligent blowout preventer for water jet, solve the technical problem that the gas in the drilling hole will continue to escape through the gap between the drill rod and the cross pipe, affect the normal work in the roadway.

[0007] The technical scheme of the utility model is realized as follows: a heavy -duty intelligent blowout preventer for water jet, including control assembly, with the drilling hole adaptation's blowout preventer and fixed component, control assembly is connected with blowout preventer, and blowout preventer is connected on the drilling machine through fixed component;The blowout preventer includes the cross pipe rotatablely connected with the drill rod on the drilling machine, the front end of the cross pipe is provided with the casing that can be inserted into the drilling hole, a first sealing sleeve adapted to the drilling hole is arranged on the casing, and a clamping unit for clamping the drill rod is arranged in the cross pipe;The control assembly includes a PLC control cabinet arranged in the roadway and a methane sensor for detecting the methane concentration outside the drilling hole, and the PLC control cabinet is connected with the methane sensor and the clamping unit respectively.

[0008] Preferably, the control assembly includes a blowout preventer arranged in the roadway, a gas extraction system and a drilling machine power supply, the cross pipe is provided with an extraction port and a residue discharge port, the extraction port and the residue discharge port are connected with the blowout preventer, the blowout preventer is connected with the gas extraction system through an extraction pipeline, the extraction pipeline is provided with a gas drilling parameter on-line monitor, and the methane sensor and the drilling machine power supply are connected with the PLC control cabinet respectively.

[0009] Preferably, the clamping unit includes a toroidal inner tube and a sealing block arranged in the cross pipe, the toroidal inner tube is connected with an external air source, the external air source is connected with the PLC control cabinet, the cross pipe is provided with a pneumatic telescopic rod, the telescopic head of the pneumatic telescopic rod can extend into the cross pipe in the circumferential direction, the telescopic head of the pneumatic telescopic rod is connected with the sealing block, and the pneumatic telescopic rod is connected with the external air source.

[0010] Preferably, an electromagnetic valve is arranged on the connecting pipeline between the toroidal inner tube and the external air source, the electromagnetic valve is connected with the pneumatic telescopic rod, and the electromagnetic valve is connected with the PLC control cabinet.

[0011] Preferably, the two sealing blocks are disposed opposite to each other inside the four-way pipe, and two pneumatic telescopic rods are disposed on the corresponding four-way pipe; the sealing blocks are arc-shaped sealing blocks, and the two pneumatic telescopic rods are respectively connected to the solenoid valve.

[0012] Preferably, the blowout preventer is equipped with a slag removal pipe, and the slag removal pipe is equipped with a pneumatic butterfly valve, which is connected to a solenoid valve.

[0013] Preferably, the inside of the four-way pipe is provided with a slag baffle plate, the slag baffle plate is provided with a slag baffle hole through which the drill rod can pass, the slag baffle hole and the annular inner tube are coaxially arranged, the tail end of the four-way pipe is provided with a fixing shell, and the sealing block is provided between the slag baffle plate and the annular inner tube; the middle part of the slag baffle plate protrudes towards the front end of the four-way pipe, and the slag baffle hole is opened in the protruding part.

[0014] Preferably, the inside of the four-way pipe is provided with a second sealing sleeve through which the drill rod can pass, and the second sealing sleeve is located between the sealing block and the slag-blocking plate; the outer diameter of the second sealing sleeve is larger than the diameter of the slag-blocking hole; the inside of the four-way pipe is provided with a fixing plate for clamping the second sealing sleeve, and the fixing plate is fixedly disposed between the sealing block and the slag-blocking plate.

[0015] Preferably, the front end of the four-way pipe is connected to a rubber joint, and a sealing ball valve is connected to one end of the sleeve near the four-way pipe. The rubber joint is connected to the sealing ball valve.

[0016] The beneficial effects of this utility model are as follows: This utility model includes a baffle plate and a clamping unit inside the four-way pipe for the drill rod to pass through. A methane sensor for detecting the methane concentration outside the borehole is installed in the tunnel. The PLC control cabinet is connected to both the methane sensor and the clamping unit. When a blowout occurs, the gas pressure inside the borehole increases, and the gas diffuses to the vicinity of the borehole through the gap between the drill rod and the four-way pipe. When the methane concentration near the borehole reaches the preset threshold of the methane sensor, the methane sensor sends an electrical signal to the PLC control cabinet, which then controls the clamping unit. The clamping unit grips the drill pipe, cutting off the path for gas in the borehole to continue escaping into the roadway through the gap between the drill pipe and the four-way pipe. The clamping unit also provides secondary clamping to quickly brake the drill pipe. Simultaneously, the casing is equipped with a first sealing sleeve adapted to the borehole. Together with the clamping unit, the gas is sealed within the blowout preventer and the borehole. This solves the technical problem of gas continuously escaping through the gap between the drill pipe and the four-way pipe, affecting normal operation in the roadway, and effectively preventing gas accidents by avoiding gas exceeding limits in the roadway. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the anti-spray component of this utility model.

[0020] Figure 3 This is a cross-sectional view of the blowout preventer assembly of this utility model connected to the drill pipe.

[0021] Figure 4 This is a schematic diagram showing the connection between the pneumatic telescopic rod and the sealing block of this utility model.

[0022] Figure 5 This is a cross-sectional view of the one-way valve of this utility model.

[0023] In the diagram: 1. Four-way pipe, 2. Drill rod, 3. Casing, 4. First sealing sleeve, 5. Sealing ball valve, 6. Extraction port, 7. Slag discharge port, 8. Slag baffle port, 9. Second sealing sleeve, 10. Annular inner tube, 11. Fixed shell, 12. Slag removal pipe, 13. Slag baffle plate, 14. Air nozzle, 15. Blowout preventer box, 16. Pneumatic butterfly valve, 17. Methane sensor, 18. Gas borehole parameter online monitoring instrument, 19. Gas extraction system, 20. PLC control cabinet, 21. Solenoid valve, 22. Drilling rig power supply, 23. External air source, 24. Fixed plate, 25. Sealing block, 26. Pneumatic telescopic rod, 27. Connecting plate, 28. Telescopic unit, 29. Telescopic sleeve, 30. Side plate, 31. Telescopic head, 32. Diagonal brace, 33. Rubber joint, 34. One-way valve, 35. Drill bit, 36. Water inlet, 37. Water outlet. Detailed Implementation

[0024] 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.

[0025] Example 1: A heavy-duty intelligent blowout preventer for hydraulic jetting, such as... Figure 1As shown, the system includes a control component, a blowout preventer (BOP) component adapted to the borehole, and a fixing component. The control component is connected to the BOP, and the BOP is connected to the drilling rig via the fixing component. The BOP includes a four-way pipe 1 that can be rotatably connected to the drill rod 2 on the drilling rig. The front end of the four-way pipe 1 is provided with a sleeve 3 that can extend into the borehole. The sleeve 3 is provided with a first sealing sleeve 4 adapted to the borehole. The inside of the four-way pipe 1 is provided with a clamping unit that can clamp the drill rod 2 a second time. The control component includes a PLC control cabinet 20 installed in the roadway and a methane sensor 17 for detecting the methane concentration outside the borehole. The PLC control cabinet 20 is connected to the methane sensor 17 and the clamping unit, respectively. Inside the four-way pipe, there is a clamping unit that allows the drill rod 2 to pass through. A methane sensor 17 is installed in the tunnel to detect the methane concentration outside the borehole. The PLC control cabinet 20 is connected to both the methane sensor 17 and the clamping unit. When a blowout occurs, the gas pressure inside the borehole increases, and the gas enters the tunnel through the gap between the drill rod 2 and the four-way pipe 1. When the methane concentration in the tunnel reaches the preset threshold of the methane sensor 17, the methane sensor 17 sends an electrical signal to the PLC control cabinet 20, which then controls the clamping unit to clamp the drill rod. Rod 2 cuts off the path for gas in the borehole to continue to escape into the roadway through the gap between drill rod 2 and four-way pipe 1, and quickly brakes the drill rod by secondary clamping of the clamping unit. At the same time, the casing 3 is equipped with a first sealing sleeve 4 that is compatible with the borehole. The first sealing sleeve 4 and the clamping unit together seal the gas in the blowout preventer and the borehole, preventing the gas from exceeding the limit in the roadway, effectively preventing the occurrence of gas accidents, and solving the technical problem that gas in the borehole will continue to escape through the gap between drill rod and four-way pipe, affecting the normal operation of the roadway.

[0026] Example 2, based on Example 1, provides a heavy-duty intelligent blowout preventer device for hydraulic jetting, such as... Figure 1As shown, the control components include a blowout preventer (BOP) 15, a gas extraction system 19, and a drilling rig power supply 22, all located within the roadway. The four-way pipe 1 has an extraction port 6 and a slag discharge port 7, both connected to the BOP 15. The BOP 15 is connected to the gas extraction system 19 via an extraction pipeline. An online gas borehole parameter monitoring instrument 18 is installed on the extraction pipeline. The methane sensor 17 and the drilling rig power supply 22 are connected to the PLC control cabinet 20. The BOP 15 is designed to collect gas and slag generated during a blowout. It provides a large gas buffer space, mitigating the impact on the BOP device to some extent. Gas from the borehole is collected into the BOP 15 via the extraction port 6, and slag generated during the borehole is collected into the BOP 15 via the slag discharge port 7. The drilling rig power supply 22 provides power to the drilling motor compatible with the drill rod 2. The gas extraction system 19 of this application is a system that uses a gas extraction device to extract gas from the blowout preventer 15 and monitors the gas concentration through a gas borehole parameter online monitoring instrument 18. The gas extraction device is a common existing device that can perform gas extraction. The preferred gas extraction device is a negative pressure gas extraction device.

[0027] When a blowout occurs, the gas pressure inside the borehole increases. The gas inside the borehole overflows through the gap between the drill rod 2 and the four-way pipe 1 and diffuses along the borehole. When the methane concentration near the borehole reaches the preset threshold of the methane sensor 17, the methane sensor 17 sends an electrical signal to the PLC control cabinet 20. The PLC control cabinet 20 controls the drilling power supply 22 to stop supplying power to the drilling motor. At the same time, the PLC control cabinet 20 controls the clamping unit to expand inward and clamp the drill rod 2, cutting off the path for the gas inside the borehole to continue to escape into the roadway through the gap between the drill rod 2 and the four-way pipe 1. Meanwhile, the casing 3 is equipped with a first sealing sleeve 4 that is compatible with the borehole. The first sealing sleeve 4 and the clamping unit together seal the gas within the blowout preventer and the borehole, allowing it to be extracted by the gas extraction system 9 in a controllable manner through the extraction port 6 and the blowout preventer box 15, ultimately preventing the gas from exceeding the limit in the roadway. After receiving the gas from the extraction port 6 and the water and slag discharged from the slag discharge port 7, the blowout preventer 15 undergoes preliminary sedimentation and separation. The gas is then extracted by the gas extraction system 9 through the extraction pipeline. An online gas borehole parameter monitor 18 is installed on the extraction pipeline. This monitor measures the amount of gas extracted during the drilling and perforation processes of the coal seam section in real time, providing a more detailed data basis for assessing the compliance of coal seam gas extraction. The overall installation and use are convenient, meeting the needs of intelligent blowout preventers under the new circumstances. The model of the online gas borehole parameter monitor 18 can be QT10-CJZ70.

[0028] Example 3, based on Example 2, provides a heavy-duty intelligent blowout preventer device for water jetting, such as...Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the clamping unit includes an annular inner tube 10 and a sealing block 25 disposed inside the four-way pipe 1. The annular inner tube 10 is connected to an external air source 23, which is connected to a PLC control cabinet 20. A pneumatic telescopic rod 26 is provided on the four-way pipe 1. The telescopic head of the pneumatic telescopic rod 26 can extend circumferentially into the four-way pipe 1. The telescopic head of the pneumatic telescopic rod 26 is connected to the sealing block 25, and the pneumatic telescopic rod 26 is connected to the external air source 23. When the pneumatic telescopic rod 26 extends, it causes the sealing block 25 to move toward the center of the four-way pipe 1, that is, the sealing block 25 moves closer to the drill rod 2 inserted into the four-way pipe 1. When the pneumatic telescopic rod 26 is fully extended, the sealing block 25 fits against the drill rod 2 to restrict the rotation of the drill rod 2. Both the annular inner tube 10 and the sealing block 25 restrict the rotation of the drill rod 2, that is, the secondary clamping of the drill rod 2 achieves rapid braking of the drill rod 2. Furthermore, the sealing block 25 restricts the rotation of the drill rod 2 much more effectively than the annular inner tube 10. The combination of the sealing block 25 and the annular inner tube 10 significantly limits the rotation of the drill rod 2 compared to the combination of two annular inner tubes 10. In this application, the annular inner tube 10 primarily functions to restrict the gap between the drill rod 2 and the four-way pipe 1, while the sealing block 25 plays a major role in limiting the rotation of the drill rod 2.

[0029] Example 4, based on Example 3, provides a heavy-duty intelligent blowout preventer device for water jetting, such as... Figure 1 and Figure 3 As shown, solenoid valves 21 are installed on the connecting pipes between the annular inner tube 10 and the external air source 23. The solenoid valves 21 are also connected to the pneumatic telescopic rod 26, and the solenoid valves 21 are connected to the PLC control cabinet 20. The annular inner tube 10 is equipped with an air nozzle 14, which is connected to the external air source 23 via an air pipe. The solenoid valves 21 are installed on the air pipe and are also connected to the pneumatic telescopic rod 26. The PLC control cabinet 20 controls whether the external air source 23 supplies air to the annular inner tube 10 and the pneumatic telescopic rod 26 by opening and closing the solenoid valves 21. This controls whether the annular inner tube 10 expands inward to grip the drill rod 2, thereby controlling whether the gas in the borehole is cut off through the gap between the drill rod 2 and the four-way pipe 1, and whether the pneumatic telescopic rod 26 extends to move the sealing block 25 toward the center of the four-way pipe 1 and quickly brake the drill rod 2.

[0030] Example 5, based on Example 4, provides a heavy-duty intelligent blowout preventer device for water jetting, such as... Figure 3 and Figure 4As shown, two sealing blocks 25 are disposed opposite to each other inside the four-way pipe 1, and two pneumatic telescopic rods 26 are disposed on the corresponding four-way pipe 1; the sealing blocks 25 are arc-shaped sealing blocks, and the two pneumatic telescopic rods 26 are respectively connected to the solenoid valve 21. The sealing blocks 25 are clamped onto the drill rod 2 by moving towards each other, thereby braking the drill rod 2. The moving of the two opposite sealing blocks 25 towards each other is achieved by the two oppositely arranged pneumatic telescopic rods 26 extending towards each other, and the two pneumatic telescopic rods 26 are respectively connected to the solenoid valve 21 through air pipes.

[0031] Example 6, based on any one of Examples 2 to 5, a heavy-duty intelligent blowout preventer device for water jetting, such as... Figure 1 As shown, the blowout preventer 15 is equipped with a slag removal pipe 12, and a pneumatic butterfly valve 16 is installed on the slag removal pipe 12. The pneumatic butterfly valve 16 is connected to a solenoid valve 21. The slag removal pipe 12 is designed to collect the water and slag generated during drilling into the blowout preventer 15, facilitating its discharge. The pneumatic butterfly valve 16 is used to control the discharge of water and slag and to keep the blowout preventer 15 sealed, preventing gas leakage and facilitating the gas extraction system 19 to extract gas from the blowout preventer 15. The slag removal pipe 12 can be connected to a coal-water separation device or a long-distance pumping vehicle to prevent water and slag from flowing into the roadway and causing coal-water crossflow at the drilling site, effectively improving the working environment. The PLC control cabinet 20 controls whether the external air source 23 supplies air to the annular inner tube 10, the pneumatic butterfly valve 16, and the pneumatic telescopic rod 26 by opening and closing the solenoid valve 21. When the external air source 23 supplies air to the pneumatic butterfly valve 16, the pneumatic butterfly valve 16 starts and closes the slag removal pipe 12, so that the blowout preventer box 15 is sealed, which facilitates the gas in the blowout preventer box 15 to be controlled by the gas extraction system 9 through the extraction port 6.

[0032] Example 7, based on Example 6, provides a heavy-duty intelligent blowout preventer device for water jetting, such as... Figure 3As shown, the inside of the four-way pipe 1 is provided with a slag baffle plate 13, and the slag baffle plate 13 is provided with a slag baffle hole 8 through which the drill rod 2 can pass. The slag baffle hole 8 and the annular inner tube 10 are coaxially arranged. The tail end of the four-way pipe 1 is provided with a fixing shell 11, and the sealing block 25 is provided between the slag baffle plate 13 and the annular inner tube 10. The middle part of the slag baffle plate 13 protrudes towards the front end of the four-way pipe 1, and the slag baffle hole 8 is opened in the protruding part. The baffle plate 13 is designed to block the small amount of water slag, gas and coal dust that spray out along the gap between the four-way pipe 1 and the drill rod 2. The middle part of the baffle plate 13 protrudes towards the front end of the four-way pipe 1, that is, the protruding direction of the baffle plate 13 is opposite to the direction of water slag and gas overflow in the borehole. When a blowout occurs, the baffle plate 13 protruding towards the front end of the four-way pipe 1 can directly withstand the impact of gas and coal dust in the borehole, and can also block some water slag, so that only a small amount of water slag, gas and coal dust can be sprayed out along the gap between the baffle hole 8 and the drill rod 2.

[0033] Example 8, based on Example 7, provides a heavy-duty intelligent blowout preventer device for water jetting, such as... Figure 3 As shown, the four-way pipe 1 has a second sealing sleeve 9 inside, through which the drill rod 2 can pass. The second sealing sleeve 9 is located between the sealing block 25 and the slag-blocking plate 13. The outer diameter of the second sealing sleeve 9 is larger than the diameter of the slag-blocking hole 8. The four-way pipe 1 has a fixing plate 24 inside for clamping the second sealing sleeve 9. The fixing plate 24 is fixedly installed between the sealing block 25 and the slag-blocking plate 13. The second sealing sleeve 9 is designed to block the small amount of water slag, gas, and coal dust sprayed out along the gap between the slag-blocking hole 8 and the drill rod 2, preventing the water slag and coal dust from reaching the gap between the annular inner tube 10 and the drill rod 2 and affecting the sealing effect of the annular inner tube 10 on the gas after expansion. The outer diameter of the second sealing sleeve 9 is larger than the diameter of the slag-blocking hole 8 to ensure that the small amount of water slag, gas, and coal dust sprayed out along the gap between the slag-blocking hole 8 and the drill rod 2 is blocked by the second sealing sleeve 9 as much as possible, reducing the possibility of water slag and coal dust crossing the second sealing sleeve 9 and reaching the gap between the annular inner tube 10 and the drill rod 2. The fixing plate 24 is set to further limit and fix the second sealing sleeve 9, so as to avoid the second sealing sleeve 9 from moving and affecting its blocking effect on water slag and coal powder.

[0034] Example 9, based on Example 8, provides a heavy-duty intelligent blowout preventer device for water jetting, such as... Figure 2 , Figure 3 and Figure 5As shown, a rubber joint 33 is connected to the front end of the four-way pipe 1. A sealing ball valve 5 is connected to the end of the sleeve 3 near the four-way pipe 1. The rubber joint 33 is connected to the sealing ball valve 5. The rubber joint 33 is composed of a fabric-reinforced rubber component and a flat union, a metal flange, or a threaded pipe flange, used for pipe vibration isolation, noise reduction, and displacement compensation. It is a highly elastic, airtight, media-resistant, and weather-resistant pipe joint. In this application, the rubber joint 33 flexibly connects the rigid four-way pipe 1 to the rigid sealing ball valve 5. The impact of the drill rod 2 rotating on the sleeve 3 and the sealing ball valve 5 is transmitted to the four-way pipe 1 only after passing through the rubber joint 5, thus protecting the service life of the four-way pipe 1 and the sealing ball valve 5. Because when the four-way pipe 1 and the sealing ball valve 5 are directly rigidly connected, the impact of the drill rod 2 rotating on the sleeve 3 and the sealing ball valve 5 is directly transmitted to the four-way pipe 1, leading to a situation where the rigid connection between the four-way pipe 1 and the sleeve 3 is prone to damage.

[0035] The casing 3 and the sealing ball valve 5 are detachably connected by bolts. The rubber joint 33 and the sealing ball valve 5 are also detachably connected by bolts. The rubber joint 33 and the four-way pipe 1 are detachably connected by bolts. After drilling is completed, and the drill rod 2 drives the drill bit 33 to complete the drilling, the bolts connecting the rubber joint 33 and the four-way pipe 1 are removed. The four-way pipe 1, the drill rod 2, and the drill bit 33 are then pulled out of the borehole. The casing 3, the first sealing sleeve 4, and the sealing ball valve 5 are left in the borehole. At the same time, the sealing ball valve 5 is closed, so that the borehole is in a sealed state. This prevents the borehole from spewing out after the four-way pipe 1, the drill rod 2, and the drill bit 33 are pulled out of the borehole, which could threaten the lives and safety of workers and equipment near the borehole.

[0036] Both the drill rod 2 and the drill bit 33 are hollow to facilitate water injection during drilling. To prevent gas leakage from the borehole along the water injection channel after drilling is completed, a one-way valve 34 is installed at the connection between the drill rod 2 and the drill bit 33. The end of the one-way valve 34 near the water inlet 36 is threaded to the drill rod 2, and the end of the one-way valve 34 near the water outlet 37 is threaded to the drill bit 33. When the drill rod 2 and the drill bit 33 are connected through the one-way valve 34, only water can be injected into the water injection channel between the drill rod 2 and the drill bit 33, and gas will not leak out along the water injection channel, which greatly improves the sealing effect of the entire heavy-duty intelligent blowout preventer.

[0037] The reason why the heavy-duty intelligent blowout preventer device of this application is called "heavy-duty" is that the existing blowout preventers applicable to conventional downhole drilling construction generally have a borehole diameter of no more than 120mm, are suitable for conventional downhole cross-layer drilling construction, have low water pressure and low flow rate, generally 6~8MPa, 100~150L / min, and the weight of the blowout preventer components is no more than 30kg. The heavy-duty intelligent blowout preventer of this application has a borehole diameter greater than 120mm, or even 153mm, with a water jet pressure of 20MPa and a flow rate of 400~500L / min. It is suitable for areas with higher coal seam gas pressure and content. Due to the larger water pressure and flow rate injected into the borehole, more coal seams are broken up inside the borehole, resulting in a higher rate and total amount of gas desorption and a greater probability of high-intensity blowouts. Therefore, the heavy-duty blowout preventer is required to have a stronger ability to prevent high-intensity gas blowouts. Consequently, the size, thickness, strength of each component, and total weight of the heavy-duty blowout preventer are also greater. The blowout preventer component of the heavy-duty intelligent blowout preventer of this application weighs more than 100kg. Therefore, in order to ensure the stability of the blowout preventer component during use, the blowout preventer component of this application will be fixedly connected to the drilling rig by a fixing component.

[0038] In Example 10, the blowout preventer and control components are assembled sequentially. In use, a hole approximately 1m long is first drilled in the coal face. Then, the drill rod 2 is inserted along the blowout preventer. The blowout preventer is then fixedly connected to the drilling rig via the connecting plate 27. The distance between the telescopic unit 28 and the fixed housing 11 at the tail of the four-way pipe 1 is adjusted by extending and retracting the telescopic unit 28. The angle of the entire blowout preventer is adjusted by hinged connection between the telescopic unit 28 and the connecting plate 27 to facilitate the insertion of the first sealing sleeve 4 into the borehole. The drilling rig is started, and the drill rod 2 continuously feeds into the borehole. Under the action of friction... When the first sealing sleeve 4 is pressed against the borehole wall, the blowout preventer assembly is fixed on the borehole and the first sealing sleeve 4 seals the borehole opening. Then, the water and slag produced by the borehole enter the blowout preventer box 15 through the slag discharge port 7. After receiving the gas from the extraction port 6 and the water and slag discharged from the slag discharge port 7, the gas undergoes preliminary sedimentation and separation. The gas is then extracted by the gas extraction system 9 through the extraction pipeline. The gas borehole parameter online monitoring instrument 18 is installed on the extraction pipeline. The gas borehole parameter online monitoring instrument 18 measures the amount of gas extracted during the drilling and punching operation of the coal borehole section in real time.

[0039] When a blowout occurs, the gas pressure inside the borehole increases. The gas overflows through the gap between the drill rod 2 and the four-way pipe 1 and diffuses along the borehole. When the methane concentration near the borehole reaches the preset threshold of the methane sensor 17, the methane sensor 17 sends an electrical signal to the PLC control cabinet 20. The PLC control cabinet 20 controls the drilling power supply 22 to stop supplying power to the drilling motor. At the same time, the PLC control cabinet 20 controls the solenoid valve 21 to start, and the external air source 23 supplies air to the annular inner tube 10, the pneumatic butterfly valve 16, and the pneumatic telescopic rod 26, causing the annular inner tube 10 to move towards the center. The expansion joint tightens the drill rod 2, cutting off the path for gas to escape through the gap between the drill rod 2 and the four-way pipe 1. The pneumatic telescopic rod 26 extends, causing the sealing block 25 to move toward the center of the four-way pipe 1, and the drill rod 2 is quickly braked. At the same time, the casing 3 is equipped with a first sealing sleeve 4 that is compatible with the borehole. The first sealing sleeve 4 and the annular inner tube 10 together seal the gas within the blowout preventer assembly and the borehole. The pneumatic butterfly valve 16 closes the slag removal pipe 12, and the gas can only be extracted by the gas extraction system 9 through the extraction port 6 and the blowout preventer box 15 in a controllable manner, ultimately avoiding the situation of excessive gas in the roadway. After receiving the gas from the extraction port 6 and the water and slag discharged from the slag discharge port 7, the blowout preventer 15 undergoes preliminary sedimentation and separation. The gas is then extracted by the gas extraction system 9 through the extraction pipeline. An online gas drilling parameter monitoring instrument 18 is installed on the extraction pipeline to measure the amount of gas extracted during the drilling and perforation process of the coal borehole section in real time.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heavy-duty intelligent blowout preventer device for hydraulic jetting, characterized in that, The application relates to a drilling device, which comprises a control assembly, a blowout-preventing assembly matched with a drilling hole and a fixing assembly, the control assembly is connected with the blowout-preventing assembly, the blowout-preventing assembly is connected on a drilling machine through the fixing assembly; the blowout-preventing assembly comprises a cross pipe (1) rotatably connected with a drill rod (2), a sleeve (3) arranged at the front end of the cross pipe (1), a first sealing sleeve (4) matched with the drilling hole arranged on the sleeve (3), and a clamping unit arranged in the cross pipe (1) and capable of clamping the drill rod (2) twice; the control assembly comprises a PLC control cabinet (20) and a methane sensor (17) used for detecting the methane concentration outside the drilling hole, and the PLC control cabinet (20) is connected with the methane sensor (17) and the clamping unit respectively.

2. A heavy-duty intelligent blowout preventer device for hydraulic jetting according to claim 1, characterized in that: The control assembly comprises a blowout-preventing box (15) arranged in a roadway, a gas extraction system (19) and a drilling machine power supply (22), the cross pipe (1) is provided with an extraction opening (6) and a residue discharging opening (7), the extraction opening (6) and the residue discharging opening (7) are connected with the blowout-preventing box (15), the blowout-preventing box (15) is connected with the gas extraction system (19) through an extraction pipeline, the extraction pipeline is provided with a gas drilling parameter on-line monitor (18), and the methane sensor (17) and the drilling machine power supply (22) are connected with the PLC control cabinet (20) respectively.

3. A heavy duty intelligent choke device for hydraulic jetting as claimed in claim 2, wherein: The clamping unit comprises a ring-shaped inner tire (10) and a sealing block (25) arranged in the cross pipe (1), the ring-shaped inner tire (10) is connected with an external air source (23), the external air source (23) is connected with the PLC control cabinet (20), the cross pipe (1) is provided with a pneumatic telescopic rod (26), the telescopic head of the pneumatic telescopic rod (26) can extend into the cross pipe (1) in the circumferential direction, the telescopic head of the pneumatic telescopic rod (26) is connected with the sealing block (25), and the pneumatic telescopic rod (26) is connected with the external air source (23).

4. A heavy duty intelligent choke device for hydraulic jetting as claimed in claim 3, wherein: An electromagnetic valve (21) is arranged on the connecting pipeline between the ring-shaped inner tire (10) and the external air source (23), the electromagnetic valve (21) is connected with the pneumatic telescopic rod (26), and the electromagnetic valve (21) is connected with the PLC control cabinet (20).

5. A heavy duty intelligent choke device for hydraulic jetting as claimed in claim 4, wherein: The two sealing blocks (25) are oppositely arranged in the cross pipe (1), and two pneumatic telescopic rods (26) are arranged on the corresponding cross pipe (1); the sealing block (25) is an arc-shaped sealing block, and the two pneumatic telescopic rods (26) are connected with the electromagnetic valve (21) respectively.

6. A heavy duty intelligent blowout preventer device for hydraulic jetting according to any one of claims 3 to 5, characterized in that: A residue removing pipeline (12) is arranged on the blowout-preventing box (15), a pneumatic butterfly valve (16) is arranged on the residue removing pipeline (12), and the pneumatic butterfly valve (16) is connected with the electromagnetic valve (21).

7. A heavy duty intelligent choke device for hydraulic jetting as claimed in claim 6, wherein: A residue blocking plate (13) is arranged in the cross pipe (1), the residue blocking plate (13) is provided with a residue blocking hole (8) through which the drill rod (2) passes, the residue blocking hole (8) and the ring-shaped inner tire (10) are coaxially arranged, a fixing shell (11) is arranged at the tail of the cross pipe (1), and the sealing block (25) is arranged between the residue blocking plate (13) and the ring-shaped inner tire (10); the middle part of the residue blocking plate (13) protrudes towards the front end of the cross pipe (1), and the residue blocking hole (8) is arranged on the protruding part.

8. A heavy duty intelligent choke device for hydraulic jetting as defined in claim 7, wherein: The inside of the cross pipe (1) is provided with a second sealing sleeve (9) for the drill rod (2) to pass through, the second sealing sleeve (9) is located between the sealing block (25) and the slag baffle (13); the outer diameter of the second sealing sleeve (9) is greater than the diameter of the slag hole (8); the inside of the cross pipe (1) is provided with a fixing plate (24) for clamping the second sealing sleeve (9), the fixing plate (24) is fixedly arranged between the sealing block (25) and the slag baffle (13).

9. A heavy duty intelligent choke device for hydraulic jetting as defined in claim 8, wherein: The front end of the cross pipe (1) is connected with a rubber joint (33), the rubber joint (33), the sleeve pipe (3) is connected with a sealing ball valve (5) at one end close to the cross pipe (1), and the rubber joint (33) is connected with the sealing ball valve (5).

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