Wellhead blowout preventer with flow guide

Abstract

This utility model discloses a wellhead blowout prevention device with a guide pipe, comprising a borehole drilled on the surface, a casing installed inside the borehole, a drilling platform installed above the borehole, a blowout preventer (BOP) pipe connected to the casing installed inside the drilling platform, a valve installed on the BOP pipe, and a guide pipe connected to the side surface of the BOP pipe, positioned above the valve and extending out of the drilling platform. This device can prevent grouting fluid from escaping from the wellhead during drilling operations, reducing ecological and environmental risks, saving economic and time costs for environmental restoration after grouting, and minimizing economic losses and ecological impact. Simultaneously, a pressure gauge installed inside the BOP can detect the pressure and flow rate of the grouting fluid to determine whether construction can continue, thereby achieving the engineering objective.

Description

Technical Field

[0001] This utility model relates to the field of coal mine grouting technology, specifically a wellhead blowout prevention device with a guide pipe. Background Technology

[0002] Coal mines with complex geological conditions and uneven coal seam thickness generate a large amount of coal gangue. Considering technical, economic, and ecological factors, the comprehensive utilization capacity of gangue is limited. Ineffective gangue treatment can affect coal washing progress and thus coal mine output. Therefore, mixing crushed coal gangue with water and filling it into the segregation space formed after coal mining has become a new method for gangue disposal and has been effectively promoted.

[0003] Due to the high grout pressure in the separation zone, grout can overflow from the borehole when constructing new grouting holes or inspection holes, making drilling impossible and causing significant environmental impact. Therefore, we propose a wellhead blowout prevention device with a guide pipe. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a wellhead blowout prevention device with a guide pipe, which can prevent grouting fluid from gushing out of the wellhead during drilling operations (drilling tools and other equipment are in the borehole), reduce ecological and environmental risks, save economic and time costs for environmental restoration after grouting, reduce economic losses and ecological and environmental impacts, and can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a blowout prevention device with a guide pipe, comprising a borehole drilled on the surface, a casing installed inside the borehole, a drilling platform installed above the borehole, a blowout preventer pipe connected to the casing installed inside the drilling platform, a valve installed on the blowout preventer pipe, and a guide pipe connected to the side surface of the blowout preventer pipe, the guide pipe being installed above the valve, and the guide pipe extending out of the outside of the drilling platform.

[0006] As a preferred embodiment of this utility model, the top of the sleeve is provided with a sleeve flange, the bottom of the blowout preventer is provided with a blowout preventer flange, and the sleeve flange and the blowout preventer flange are connected by bolts for sealing.

[0007] As a preferred technical solution of this utility model, the valve includes a fixed valve plate, a rotating valve plate, and a rotating cylinder. The fixed valve plate is fixedly installed inside the blowout preventer pipe, and the rotating valve plate is rotatably installed on the upper part of the fixed valve plate inside the blowout preventer pipe. Both the fixed valve plate and the rotating valve plate have arc-shaped valve plate discharge holes on their upper surfaces. When the rotating valve plate rotates, the two valve plate discharge holes can be aligned or staggered. The rotating cylinder is fixedly installed at the center of the upper surface of the rotating valve plate.

[0008] As a preferred embodiment of this utility model, the upper surface of the blowout preventer is enclosed, and a gearbox is provided on the upper surface of the blowout preventer. A driving gear and a driven gear are rotatably arranged inside the gearbox. The top end of the rotating cylinder passes through the gearbox and is connected to the driven gear. A servo motor is provided on the upper surface of the gearbox, and the output shaft of the servo motor passes through the gearbox and is connected to the driving gear.

[0009] As a preferred embodiment of this utility model, a fixing ring is provided on the upper surface of the fixed valve plate, and a rotating groove corresponding to the fixing ring is provided on the lower surface of the rotating valve plate.

[0010] As a preferred embodiment of this utility model, the fixed valve plate, the rotating valve plate, the gearbox, and the drilling platform are all provided with drill rod holes that are coaxial with the drilling hole.

[0011] As a preferred embodiment of this utility model, a flow meter is installed on the guide pipe.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: Before drilling reaches the separation zone or pressurized zone, the blowout prevention device is connected to the upper-level water-stop casing. Drilling equipment such as drill collars and drill rods enter the borehole for drilling operations. If slurry or water seepage occurs in the pressurized area, the valve is closed. If the pressure or flow rate of the slurry or water seepage is large, wait for the pressure to release or the flow rate to decrease. If the pressure or flow rate of the slurry or water seepage is small, the valve can be opened to continue drilling operations. The seepaged slurry or water flows along the guide pipe into the mud pit (slurry storage device) for subsequent treatment or reinjection. This device can prevent pressurized slurry from seeping out of the wellhead during drilling operations, reducing ecological and environmental risks, saving economic and time costs for environmental restoration after slurry seepage, and reducing economic losses and ecological and environmental impacts. At the same time, the pressure and flow rate of the pressurized slurry can be detected by a pressure gauge installed in the blowout preventer to determine whether construction can continue, thereby achieving the engineering objective. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 3 This is a schematic diagram of the valve structure of this utility model;

[0016] Figure 4 This is a top view of the fixed valve plate of this utility model.

[0017] In the diagram: 1. Surface, 2. Casing, 3. Drill hole, 4. Drilling platform, 5. Casing flange, 6. Blowout preventer flange, 7. Blowout preventer, 8. Fixed valve plate, 9. Rotating valve plate, 10. Guide pipe, 11. Flow meter, 12. Rotating cylinder, 13. Gearbox, 14. Servo motor, 15. Drill rod hole, 16. Valve plate slurry outlet hole, 17. Fixing ring. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-4 This utility model provides a technical solution: a blowout prevention device with a guide pipe, comprising a borehole 3 drilled on the surface 1, a casing 2 installed inside the borehole 3, a drilling platform 4 installed above the borehole 3, a blowout preventer 7 connected to the casing 2 installed inside the drilling platform 4, a valve installed on the blowout preventer 7, and a guide pipe 10 connected to the side surface of the blowout preventer 7, the guide pipe 10 being located above the valve and extending outward from the outside of the drilling platform 4. Overflowing slurry is discharged through the guide pipe 10.

[0020] Before drilling reaches the separation zone or pressurized zone, the blowout prevention device is connected to the upper-level water-stop casing 2. Drilling equipment such as drill collars and drill rods enter the borehole 3 for drilling. If slurry or water seepage occurs in the pressurized area, the valve is closed. If the pressure or flow rate of the slurry or water seepage is large, wait for the pressure to release or the flow rate to decrease. If the pressure or flow rate of the slurry or water seepage is small, the valve can be opened to continue drilling. The slurry or water seepage enters the mud pit (slurry storage device) along the guide pipe 10 for subsequent treatment or reinjection.

[0021] In the preferred embodiment, the top of the sleeve 2 is provided with a sleeve flange 5, and the bottom of the blowout preventer 7 is provided with a blowout preventer flange 6. The sleeve flange 5 and the blowout preventer flange 6 are connected by bolts for sealing. The sleeve 2 and the blowout preventer 7 are connected by standardized flanges, which is convenient for connection, has good sealing performance, and improves on-site assembly efficiency.

[0022] In a preferred embodiment, the valve includes a fixed valve plate 8, a rotating valve plate 9, and a rotating cylinder 12. The fixed valve plate 8 is fixedly disposed inside the blowout preventer 7, and the rotating valve plate 9 is rotatably disposed on the upper part of the fixed valve plate 8 inside the blowout preventer 7. Both the fixed valve plate 8 and the rotating valve plate 9 have arc-shaped valve plate slurry outlet holes 16 on their upper surfaces. The fan-shaped arc of the valve plate slurry outlet holes 16 is 60-120 degrees. When the rotating valve plate 9 rotates, the two valve plate slurry outlet holes 16 can be aligned or staggered. When aligned, the flow rate is the maximum. When partially staggered, the area of ​​the vertical connection inside the blowout preventer 7 can be adjusted, and the slurry flow rate can be adjusted. When completely staggered, the valve can be closed.

[0023] In a further preferred embodiment, the rotating cylinder 12 is fixedly positioned at the center of the upper surface of the rotating valve plate 9. The upper surface of the blowout preventer 7 is enclosed, and a gearbox 13 is mounted on its upper surface. A driving gear and a driven gear are rotatably mounted within the gearbox 13. The top end of the rotating cylinder 12 passes through the gearbox 13 and connects to the driven gear. A servo motor 14 is mounted on the upper surface of the gearbox 13, and the output shaft of the servo motor 14 passes through the gearbox 13 and connects to the driving gear. The servo motor 14 drives the driving gear to rotate, which in turn drives the rotating cylinder 12 to rotate via the driven gear, thereby rotating the rotating valve plate 9. This adjusts the relative position of the two valve plate slurry outlet holes 16, regulating the flow rate and speed of the discharged slurry. This does not affect the operation of the drill rod.

[0024] Furthermore, the upper surface of the fixed valve plate 8 is provided with a fixed ring 17, and the lower surface of the rotating valve plate 9 is provided with a rotating groove corresponding to the fixed ring 17. The cross-sectional shape of the rotating groove and the fixed ring 17 can both be T-shaped, so that the rotating valve plate 9 is more stable when it rotates on the fixed valve plate 8 through the rotating groove and the fixed ring 17.

[0025] In a preferred embodiment, the fixed valve plate 8, the rotating valve plate 9, the gearbox 13, and the drilling platform 4 are all provided with drill rod holes 15 that are coaxial with the drill hole 3, for the drill rod to pass through.

[0026] Optionally, a dynamic seal is provided between the inner side of the rotating valve plate 9 and the blowout preventer 7, and between the drill rod hole 15 of the fixed valve plate 8 and / or the inner side of the rotating cylinder 12 and the drill rod. The dynamic seal seals the blowout preventer 7 and the drill rod hole 15 to prevent slurry from overflowing from the drill rod hole 15 to the outside.

[0027] In a preferred embodiment, a flow meter 11 is installed on the guide pipe 10, and a pressure gauge is installed on the lower inner side of the blowout preventer 7. The pressure and flow rate of the pressurized grout can be used to determine whether construction can continue, thereby achieving the engineering objective. The flow meter 11, pressure gauge, and servo motor 14 are all electrically connected to an external controller and powered by an external power supply. The controller is preferably a commonly used microcontroller or PLC controller, such as an Arduino series microcontroller or a Siemens S7 series PLC controller. The controller controls the flow meter 11, pressure gauge, and servo motor 14 using methods commonly found in existing technologies.

[0028] The controller, flow meter 11, pressure gauge and servo motor 14 used in this application are all commonly used electronic components in the prior art. Their specific structure, working principle, control method and circuit connection are all well known technologies and will not be described in detail here.

[0029] Example:

[0030] In a coal mine, mining faces A and B are adjacent and have both been fully mined, resulting in overlying abscission zones. Grouting is currently underway in the abscission zone of mining face A under pressure. There is a risk of connection between the abscission zones of mining faces A and B. Therefore, drilling grouting boreholes in mining face B carries the risk of grout leakage.

[0031] The drilling for grouting in coal face B involves a drill rod with an outer diameter of 89mm. The drilling structure is a three-section system: Section 1 has a diameter of 311.2mm, a casing structure of Φ273×7, and a depth of +0.5 to 77.22m; Section 2 has a diameter of 215.9mm, a casing structure of Φ177.8×9.19, and a depth of +0.5 to 385.50m; Section 3 is a perforated pipe with a diameter of 152mm, a casing structure of Φ127×6.43, and a depth of 372.77 to 486.01m. Section 3 is the grouting section. Therefore, before constructing Section 3, the water-stop casing and blowout preventer (BOP) of Section 2 are securely connected using flanges. The inner diameter of the drill rod hole for the valve used in the BOP is 89mm. After the BOP is installed, the drilling of Section 3 (the grouting section) is carried out.

[0032] At a depth of 444.37 meters in the third section of the drilling, slurry gushed out of the borehole. The blowout preventer was first shut off to prevent the slurry from spraying out and polluting the environment. Then, based on the pressure displayed by the pressure gauge (which can be the one on the drilling platform) and the amount of slurry gushing out, the blowout preventer was opened appropriately, and drilling continued. The top leakage was constructed to the designed depth of 486.01 meters. The gushing slurry flowed along the guide pipe into the mud pit. Since the slurry was gangue slurry injected into the separation zone, the slurry was then reinjected along the borehole into the separation space of the coal mining face B.

[0033] Based on the fact that the outer diameter of the drill rod in this operation is 89mm and the inner diameter of the drill rod hole of the blowout preventer is 89mm, we can select blowout preventers of different inner diameter models of gates according to actual needs.

[0034] The parts not disclosed in this utility model are all prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blowout preventer with a flow guide pipe, comprising a borehole (3) opened on the ground surface (1), a casing (2) arranged in the borehole (3), characterized in that: A drilling platform (4) is provided above the borehole (3). A blowout preventer (7) connected to the casing (2) is provided on the inner side of the drilling platform (4). A valve is provided on the blowout preventer (7), and a guide pipe (10) is connected to the side surface of the blowout preventer (7). The guide pipe (10) is located on the upper side of the valve and extends out of the outer side of the drilling platform (4).

2. A wellhead blowout prevention device with a guide pipe according to claim 1, characterized in that: The top of the sleeve (2) is provided with a sleeve flange (5), and the bottom of the blowout preventer (7) is provided with a blowout preventer flange (6). The sleeve flange (5) and the blowout preventer flange (6) are connected by bolts for sealing.

3. A wellhead blowout prevention device with a guide pipe according to claim 1, characterized in that: The valve includes a fixed valve plate (8), a rotating valve plate (9), and a rotating cylinder (12). The fixed valve plate (8) is fixedly installed inside the blowout preventer (7). The rotating valve plate (9) is rotatably installed on the upper part of the fixed valve plate (8) inside the blowout preventer (7). Both the fixed valve plate (8) and the rotating valve plate (9) have arc-shaped valve plate discharge holes (16) on their upper surfaces. When the rotating valve plate (9) rotates, the two valve plate discharge holes (16) can be aligned or staggered. The rotating cylinder (12) is fixedly installed at the center of the upper surface of the rotating valve plate (9).

4. A wellhead blowout prevention device with a guide pipe according to claim 3, characterized in that: The upper surface of the blowout preventer (7) is enclosed, and a gearbox (13) is provided on the upper surface of the blowout preventer (7). A driving gear and a driven gear are rotatably arranged inside the gearbox (13). The top end of the rotating cylinder (12) passes into the gearbox (13) and is connected to the driven gear. A servo motor (14) is provided on the upper surface of the gearbox (13). The output shaft of the servo motor (14) passes into the gearbox (13) and is connected to the driving gear.

5. A wellhead blowout prevention device with a guide pipe according to claim 3, characterized in that: The upper surface of the fixed valve plate (8) is provided with a fixed ring (17), and the lower surface of the rotating valve plate (9) is provided with a rotating groove corresponding to the fixed ring (17).

6. A wellhead blowout prevention device with a guide pipe according to claim 4, characterized in that: The fixed valve plate (8), the rotating valve plate (9), the gearbox (13), and the drilling platform (4) are all provided with drill rod holes (15) that are coaxial with the drill hole (3).

7. A wellhead blowout prevention device with a guide pipe according to any one of claims 1-6, characterized in that: A flow meter (11) is installed on the guide pipe (10).

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