Wellhead control device for high-pressure water gushing and slurry gushing drill hole

Abstract

The utility model discloses a high-pressure water gushing and slurry gushing drilling well mouth control device which comprises a drainage device and a well mouth control device body. The drainage device is in butt joint with a wall protection pipe which is positioned and installed through well cementation cement and used for directional flow guiding and discharging of gushing water and gushing slurry. The well mouth control device is fixedly installed at the pipe opening of the wall protecting pipe and used for controlling the pipe opening of the wall protecting pipe after the drainage device is detached. The drilling wellhead control device is simple in structure, convenient to operate and capable of effectively controlling water gushing and slurry gushing, ground surface settlement caused by slurry gushing and pressure relief can be reduced, and the separation layer grouting effect is improved.

Description

Technical Field

[0001] This utility model relates to the fields of coal mining and geothermal new energy technology, specifically to a high-pressure water inrush and slurry inrush borehole wellhead control device. Background Technology

[0002] Overburden separation grouting and downhole backfilling technologies have been implemented in many regions, playing a significant role in reducing the extent of coal pillars covered and releasing some of the covered coal resources. However, in separation grouting projects, high-pressure grout leakage at the surface often occurs due to factors such as fault structures, poorly sealed boreholes, weak overburden zones, and high-pressure grouting. Without prior preparation of corresponding measures, the grout continues to surge upwards, causing environmental pollution and reducing separation pressure, thus diminishing the sediment reduction effect.

[0003] In addition, in some areas, when conducting geothermal resource surveys, due to a lack of understanding of the geothermal resource occurrence, geothermal water may gush out along the well pipes, making it difficult to carry out subsequent work and affecting the construction period and the quality of geothermal well construction. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a high-pressure water and slurry inrush wellhead control device. This wellhead control device has a simple structure and is easy to operate. It can effectively control water and slurry inrush, thereby reducing surface subsidence caused by slurry leakage and pressure relief, and improving the grouting effect.

[0005] A high-pressure water inrush and slurry inrush borehole wellhead control device includes a diversion device and a wellhead control device;

[0006] The diversion device is connected to the wall protection pipe installed by cementing, and is used for the directional diversion and discharge of water and slurry.

[0007] The wellhead control device is fixedly installed at the inlet of the protective pipe and is used to control the inlet of the protective pipe after the drainage device is removed.

[0008] As a preferred embodiment of the above technical solution, the drainage device includes a drainage tube, on which a control valve is installed, and the inlet of the drainage tube is connected to the protective wall tube through a sealing assembly.

[0009] As a preferred embodiment of the above technical solution, the sealing assembly includes a snap-fit ​​short section fixed to the inlet of the drainage pipe and a water-stop rubber ring snapped into the opening of the protective wall pipe. The drainage pipe and the protective wall pipe are sealed and connected by the rotation and compression of the water-stop rubber ring by the snap-fit ​​short section.

[0010] As a preferred embodiment of the above technical solution, the fastening short section is a truncated cone shape with a larger upper section and a smaller lower section, and the water-stop rubber ring is inserted from top to bottom and snapped into the opening of the protective pipe and positioned by the rubber ring retainer.

[0011] As a preferred embodiment of the above technical solution, the drainage tube is L-shaped.

[0012] As a preferred embodiment of the above technical solution, the wellhead control device includes a support plate, which is fixed to the wall casing. A casing is welded above the support plate and coaxially sleeved on the wall casing. A flange is welded along the upper edge of the casing.

[0013] As a preferred embodiment of the above technical solution, the flange is installed at a height lower than the inlet of the protective pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. Simple structure, easy operation, low production cost, and after connection, it can effectively control the outflow of water and grout, reducing waste of grouting materials and disposal costs.

[0016] 2. It can reduce surface subsidence caused by grout leakage and pressure relief, improve the grouting effect, increase treatment efficiency, prevent the outflow of cement grout from polluting the surrounding surface, and protect the environment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The attached diagram is labeled as follows: 1-Drainage device, 2-Wellhead control device, 3-Cementing cement, 4-Wall protection pipe, 5-Drainage pipe, 6-Control valve, 7-Sealing assembly, 701-Securing short section, 702-Water-stop rubber ring, 8-Rubber ring retainer, 9-Support plate, 10-Casing, 11-Flange. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings:

[0021] like Figure 1The device shown is a high-pressure water inrush and slurry inrush wellhead control device, which includes a diversion device 1 and a wellhead control device 2.

[0022] The diversion device 1 is connected to the wall protection pipe 4, which is positioned and installed by the cementing cement 3, and is used for the directional diversion and discharge of water and slurry.

[0023] The wellhead control device 2 is fixedly installed at the inlet of the wall-protecting pipe 4 and is used to control the inlet of the wall-protecting pipe 4 after the drainage device 1 is removed.

[0024] In this embodiment, the drainage device 1 includes a drainage tube 5, on which a control valve 6 is installed, and the inlet of the drainage tube 1 is connected to the protective wall tube 4 through a sealing assembly 7.

[0025] In this embodiment, the sealing assembly 7 includes a snap-fit ​​short section 701 fixed to the inlet of the drainage pipe 5 and a water-stop rubber ring 702 snapped into the opening of the protective wall pipe 4. The drainage pipe 5 and the protective wall pipe 4 are sealed and connected by the rotation and compression of the water-stop rubber ring 702 by the snap-fit ​​short section 701.

[0026] In this embodiment, the fastening short section 701 is a truncated cone shape with a larger top and a smaller bottom, and the water-stop rubber ring 702 is inserted from top to bottom and snapped into the opening of the protective pipe 4 and positioned by the rubber ring retainer 8.

[0027] In this embodiment, the drainage tube 5 is L-shaped.

[0028] In this embodiment, the wellhead control device 2 includes a support plate 9, which is fixed to the wall protection pipe 4. A casing 10 is welded above the support plate 9 and is coaxially sleeved on the wall protection pipe 4. A flange 11 is welded along the upper edge of the casing 10.

[0029] In this embodiment, the flange 11 is installed at a height lower than the port of the protective pipe 4.

[0030] The installation and working principle of this embodiment are as follows.

[0031] The first step is to install the wellhead control device 2: Take an iron plate with a diameter slightly larger than the wall-wall pipe 4 as the support plate 9, and cut a round hole inside it to make it easy to fit over the outside of the wall-wall pipe 4. At the same time, take a casing 10 that is one to two sizes larger than the wall-wall pipe 4 and weld it to the iron plate with the round hole in the same circle. Weld a flange 11 to the other end of the casing 10. Weld the flange 11, casing 10 and support plate 9 together in the aforementioned connection method, and weld the support plate 9 to the wall of the wall-wall pipe 4. At this time, the entire wellhead control device 2 is connected to the wall-wall pipe 4.

[0032] The second step is to assemble the drainage device 1: the control valve 6 and the drainage pipe 5 are connected by reducing welding, threading or flange connection. The short section 701 is welded to the bottom of the drainage pipe 5. The short section 701 has the same diameter as the inside of the drainage pipe 5. The wide opening is connected to the bottom of the drainage pipe 5, the narrow opening is facing down and the wide opening is facing up. The diameter of the widest part is basically the same as or slightly larger than the inner diameter of the protective wall pipe 4. The diameter of the narrow opening should be slightly smaller than the difference between the inner diameter of the protective wall pipe 4 and the wall thickness of the water-stop rubber ring 702. It is used to connect the drainage pipe 5 and the protective wall pipe 4. The water-stop rubber ring 702 is duckbill shaped and is stuck at the opening of the protective wall pipe 4. There is one layer inside and one layer outside the protective wall pipe 4. Flat iron or other materials are used as rubber ring retainers 8 to fix the water-stop rubber ring 702 at the opening of the protective wall pipe 4.

[0033] The third step is to assemble the drainage device 1: screw on the drainage tube 5. The drainage tube 5 is designed in an L-shape, which is more labor-saving. Tightly fastening the short section 701 will fully compress the water-stop rubber ring 702, so that there is no gap between the protective tube 4 and the drainage device 1, preventing water and slurry from overflowing.

[0034] Fourth step, drainage device 1: Open control valve 6 to allow water and slurry to be discharged through drainage pipe 5;

[0035] Fifth step, disassemble the drainage device 1, twist the drainage tube 5 in the opposite direction, disconnect the drainage device 1 from the protective tube 4, and remove the rubber ring retainer 8 and the water-stop rubber ring 702 in sequence.

[0036] Step 6: Seal flange 11. Connect and tighten the flange 11 of the wellhead control device 2 with a flange of the same diameter and valve to achieve control of high-pressure water inrush and slurry inrush wellhead.

[0037] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-pressure water inrush and slurry inrush borehole head control device, characterized in that: Including diversion devices and wellhead control devices; The diversion device is connected to the wall protection pipe installed by cementing, and is used for the directional diversion and discharge of water and slurry. The wellhead control device is fixedly installed at the inlet of the protective pipe and is used to control the inlet of the protective pipe after the drainage device is removed.

2. The borehole wellhead control device according to claim 1, characterized in that: The drainage device includes a drainage tube with a control valve installed on it, and the inlet of the drainage tube is connected to the protective wall tube through a sealing assembly.

3. The borehole wellhead control device according to claim 2, characterized in that: The sealing assembly includes a snap-fit ​​short section fixed to the inlet of the drainage pipe and a water-stop rubber ring snapped into the opening of the protective wall pipe. The drainage pipe and the protective wall pipe are sealed together by the rotation and compression of the water-stop rubber ring by the snap-fit ​​short section.

4. The borehole wellhead control device according to claim 3, characterized in that: The fastening short section is a truncated cone shape with a larger top and a smaller bottom. The water-stop rubber ring is inserted from top to bottom and snapped into the opening of the protective pipe and positioned by the rubber ring retainer.

5. The borehole wellhead control device according to claim 2, characterized in that: The drainage tube is L-shaped.

6. The borehole wellhead control device according to claim 1, characterized in that: The wellhead control device includes a support plate, which is fixed to the wall casing. A casing is welded above the support plate and coaxially sleeved on the wall casing. A flange is welded along the upper edge of the casing.

7. The borehole wellhead control device according to claim 6, characterized in that: The flange is installed at a height lower than the inlet of the protective pipe.

Images