A device for preventing water inrush during downhole core drilling

Abstract

This utility model belongs to the field of downhole drilling construction technology, and in particular to a water-inrush prevention device for downhole core drilling. It includes a protective support shell, inside which a double-layer sealed rubber seat is fixedly connected. An installation groove is formed inside the double-layer sealed rubber seat, and a plurality of second adsorption magnetic plates are fixedly connected to the bottom of the inner cavity of the installation groove. A plurality of electromagnetic plates are fixedly connected to the top of the inner cavity of the installation groove, and the opposing surfaces of the electromagnetic plates and the second adsorption magnetic plates have the same magnetic poles. The electromagnetic plates are connected to each other by connecting lines. By utilizing the magnetic repulsion between the second adsorption magnetic plates and the electromagnetic plates, and because this magnetic repulsion is always present, and the magnetic force of the electromagnetic plates can be adjusted by adjusting the current inside the electromagnetic plates during use, the double-layer sealed rubber seat can always maintain a tight fit with the top wall of the wellhead during use.

Description

Technical Field

[0001] This utility model belongs to the field of downhole drilling construction technology, specifically relating to a water inrush prevention device for downhole core drilling. Background Technology

[0002] During downhole core drilling, water inrush is a common geological phenomenon that can pose safety hazards. The role of anti-inrush devices is to effectively control water inrush and ensure the safe and smooth progress of drilling operations. Common anti-inrush devices often use sealing plates to seal the wellhead to prevent water inrush. However, during downhole drilling, the water pressure of the upward-rushing water is relatively high. When it rushes outward, it will impact the bottom of the sealing plate and may cause the connection of the sealing components to loosen, resulting in a decrease in the effectiveness of anti-inrush. Utility Model Content

[0003] This utility model provides a water inrush prevention device for downhole core drilling. It features the ability to maintain a tight fit between the double-layer sealed rubber seat and the top wall of the wellhead by means of the magnetic repulsion between the second adsorption magnetic plate and the electromagnetic plate. Since the magnetic repulsion is always present, and the magnitude of the electromagnetic plate's magnetic force can be adjusted by adjusting the internal current of the electromagnetic plate during use, the double-layer sealed rubber seat can always be tightly fitted to the top wall of the wellhead during use.

[0004] This utility model provides the following technical solution: a water inrush prevention device for downhole core drilling, comprising a protective support shell, a double-layer sealed rubber seat fixedly connected inside the protective support shell, an installation connection groove formed inside the double-layer sealed rubber seat, a plurality of second adsorption magnetic plates fixedly connected to the bottom of the installation connection groove, a plurality of electromagnetic plates fixedly connected to the top of the installation connection groove, and the magnetic poles of the opposing surfaces of the plurality of electromagnetic plates and the plurality of second adsorption magnetic plates being the same, the plurality of electromagnetic plates being connected to each other by a connecting line, and one end of the connecting line extending to the outside of the protective support shell.

[0005] The protective support shell has a first magnetic adsorption plate fixedly connected to its inner side, and the double-layer sealed rubber seat is fixedly connected to the top of the first magnetic adsorption plate.

[0006] The bottom of the first adsorption magnetic plate is fixedly connected to an inner protective plate, and the inner protective plate is located inside the wellhead.

[0007] The double-layer sealed rubber seat has a first installation clearance groove at its center.

[0008] The double-layer sealing rubber seat has a pressure plate symmetrically arranged on the top, and a second installation clearance groove is opened on one side of the pressure plate.

[0009] The second mounting clearance groove is located in a position corresponding to the first mounting clearance groove.

[0010] The bottom of the protective support shell is fixedly connected to a mounting base.

[0011] The beneficial effects of this utility model are as follows: the sealing and anti-surge effect at the wellhead is achieved through the cooperation of the second adsorption magnetic plate, the electromagnetic plate, and the double-layer sealing rubber seat. By utilizing the magnetic repulsion between the second adsorption magnetic plate and the electromagnetic plate, and because the magnetic repulsion will always exist, and the magnitude of the electromagnetic plate's magnetic force can be adjusted by adjusting the internal current of the electromagnetic plate during use, the double-layer sealing rubber seat can always be tightly fitted to the top wall of the wellhead during use. In addition, the anti-surge effect at the wellhead can be further improved through the cooperation of the first adsorption magnetic plate and the inner protective plate.

[0012] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present invention when water gushing out at the wellhead;

[0014] Figure 2 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0015] Figure 3 This is a top view of the structure between the protective support shell, the double-layer sealed rubber seat, the first mounting clearance groove, the mounting connection groove, and the electromagnetic plate in this utility model.

[0016] Figure 4 This is a three-dimensional exploded view of the present invention.

[0017] In the diagram: 1. Protective support shell; 11. First magnetic adsorption plate; 12. Inner protective plate; 13. Mounting base; 2. Double-layer sealed rubber seat; 21. First mounting clearance groove; 22. Mounting connection groove; 3. Second magnetic adsorption plate; 31. Electromagnetic plate; 311. Connecting wire; 4. Pressure plate; 41. Second mounting clearance groove. Detailed Implementation

[0018] Please see Figures 1-4The present invention provides the following technical solution: a water inrush prevention device for downhole core drilling, comprising a protective support shell 1, a double-layer sealed rubber seat 2 fixedly connected inside the protective support shell 1, an installation connection groove 22 formed inside the double-layer sealed rubber seat 2, and a plurality of second adsorption magnetic plates 3 fixedly connected to the bottom of the inner cavity of the installation connection groove 22, and a plurality of electromagnetic plates 31 fixedly connected to the top of the inner cavity of the installation connection groove 22, wherein the magnetic poles of the opposing surfaces of the plurality of electromagnetic plates 31 and the plurality of second adsorption magnetic plates 3 are the same, and the plurality of electromagnetic plates 31 are connected to each other by a connecting line 311, and one end of the connecting line 311 extends to the outside of the protective support shell 1.

[0019] In this implementation scheme: the protective support shell 1 is the outer shell of the entire device, serving as a carrier for connecting the double-layer sealed rubber seat 2 and providing support between the entire device and the ground. The mounting connection groove 22 located inside the double-layer sealed rubber seat 2 provides space for the installation of the second adsorption magnetic plate 3 and the electromagnetic plate 31. By installing the second adsorption magnetic plate 3 and the electromagnetic plate 31 inside the mounting connection groove 22, during use, the magnetic repulsion between the electromagnetic plate 31 and the second adsorption magnetic plate 3 allows the bottom side of the double-layer sealed rubber seat 2 to be tightly fitted to the top wall of the wellhead. During use, the magnitude of the current of the electromagnetic plate 31 can be adjusted to control the magnitude of the magnetic repulsion between the second adsorption magnetic plate 3 and the electromagnetic plate 31. Furthermore, during use, the magnitude of the magnetic repulsion between the second adsorption magnetic plate 3 and the electromagnetic plate 31 can be adjusted according to whether water flows into the wellhead. During this process, when the wellhead... When water surges, the double-layer sealing rubber seat 2, being made of elastic material, deforms and bulges upwards under the impact of the water surging outwards from the wellhead. At this time, the operator can make a corresponding judgment on whether to adjust the internal current of the electromagnetic plate 31 based on the state of the double-layer sealing rubber seat 2. The second adsorption magnetic plate 3, the electromagnetic plate 31, and the double-layer sealing rubber seat 2 work together to seal and prevent surging at the wellhead. By utilizing the magnetic repulsion between the second adsorption magnetic plate 3 and the electromagnetic plate 31, the magnetic force of the electromagnetic plate 31 can be adjusted by adjusting the internal current of the electromagnetic plate 31 during use. This ensures that the double-layer sealing rubber seat 2 remains tightly fitted to the top wall of the wellhead during use. The connecting line 311, located between several electromagnetic plates 31, is used to connect the several electromagnetic plates 31 and to connect to an external power source.

[0020] The inner side of the protective support shell 1 is fixedly connected to a first adsorption magnetic plate 11, and the double-layer sealing rubber seat 2 is fixedly connected to the top of the first adsorption magnetic plate 11; wherein the first adsorption magnetic plate 11 is used to adsorb and limit the second adsorption magnetic plate 3, so that the double-layer sealing rubber seat 2 can fit tightly with the top wall of the wellhead.

[0021] An inner protective plate 12 is fixedly connected to the bottom of the first adsorption magnetic plate 11, and the inner protective plate 12 is located inside the wellhead; wherein the inner protective plate 12 is used to shield the gap between the bottom of the first adsorption magnetic plate 11 and the contact surface of the top wall of the wellhead, and to intercept the liquid flowing out from the inside to the outside, so as to prevent the liquid inside from leaking to the outside through the gap between the first adsorption magnetic plate 11 and the top wall of the wellhead.

[0022] The double-layer sealed rubber seat 2 has a first installation clearance groove 21 at its center; wherein the first installation clearance groove 21 is used to provide clearance space for the drill rod to drill downward.

[0023] The top of the double-layer sealing rubber seat 2 is symmetrically provided with pressure plates 4, and a second installation clearance groove 41 is provided on one side of the pressure plate 4; wherein the pressure plate 4 is used to increase or decrease the counterweight of the top of the double-layer sealing rubber seat 2. When liquid gushes out of the wellhead, the water inside the wellhead can be temporarily pressed down by pressing the pressure plate 4 on the top of the double-layer sealing rubber seat 2, which helps to improve the stability of the entire anti-gushing device.

[0024] The second mounting clearance groove 41 is located in a position corresponding to the first mounting clearance groove 21, so that the pressure plate 4 is positioned in the middle area of ​​the first mounting clearance groove 21 after being locked on the outside of the drill rod.

[0025] The bottom of the protective support shell 1 is fixedly connected to the mounting base 13; the mounting base 13 is used to install and fix the device to the ground. When installing the entire anti-rush device, the protective support shell 1 is first placed on the outside of the well opening, and the inner protective plate 12 is extended to the inner wall of the well opening. Then, the installation of the entire anti-rush device to the ground is completed by fixing it to the ground through the mounting base 13.

[0026] The working principle and usage process of this utility model are as follows: When an anti-water-rush device needs to be installed during drilling operations, the protective support shell 1 is first fitted onto the outside of the wellhead, and the inner protective plate 12 is extended to the inner wall of the wellhead. Then, it is fixed to the ground via the mounting base 13. Next, the drill rod is extended into the well through the first mounting clearance groove 21, and the connecting wire 311 is connected to an external power source. At this time, the electromagnetic plate 31 and the second adsorption magnetic plate 3 generate magnetic repulsion due to their identical magnetic poles. During use, the magnetic repulsion between the electromagnetic plate 31 and the second adsorption magnetic plate 3 allows the bottom side of the double-layer sealed rubber seat 2 to be tightly fitted to the top wall of the wellhead. Furthermore, the current of the electromagnetic plate 31 can be adjusted during use to achieve the desired effect. The magnitude of the magnetic repulsion between the second adsorption magnetic plate 3 and the electromagnetic plate 31 is adjusted during use based on whether water gushing out at the wellhead. During this process, when water gushing out at the wellhead, the double-layer sealing rubber seat 2, due to its elastic material, deforms and bulges upward under the impact of the water gushing out from the wellhead. At this time, the operator can make a corresponding judgment on the magnitude of the internal current of the electromagnetic plate 31 based on the state of the double-layer sealing rubber seat 2. In addition, when liquid gushing out from the wellhead, the water inside the wellhead can be temporarily suppressed by pressing the pressure plate 4 on the top of the double-layer sealing rubber seat 2, which helps to improve the stability of the entire anti-gushing water device.

Claims

1. A water inrush prevention device for downhole core drilling, comprising a protective support shell (1), wherein a double-layer sealed rubber seat (2) is fixedly connected inside the protective support shell (1), characterized in that: The double-layer sealed rubber seat (2) forms an installation connection groove (22) inside, and a number of second adsorption magnetic plates (3) are fixedly connected to the bottom of the inner cavity of the installation connection groove (22). A number of electromagnetic plates (31) are fixedly connected to the top of the inner cavity of the installation connection groove (22). The magnetic poles of the opposite surfaces of the electromagnetic plates (31) and the second adsorption magnetic plates (3) are the same. The electromagnetic plates (31) are connected to each other by a connecting line (311), and one end of the connecting line (311) extends to the outside of the protective support shell (1).

2. The downhole core drilling anti-water-rush device according to claim 1, characterized in that: The inner side of the protective support shell (1) is fixedly connected to a first adsorption magnetic plate (11), and the double-layer sealed rubber seat (2) is fixedly connected to the top of the first adsorption magnetic plate (11).

3. The downhole core drilling anti-water-rush device according to claim 2, characterized in that: The bottom of the first adsorption magnetic plate (11) is fixedly connected to an inner protective plate (12), and the inner protective plate (12) is located inside the wellhead.

4. The downhole core drilling anti-water-rush device according to claim 1, characterized in that: The double-layer sealed rubber seat (2) has a first installation clearance groove (21) at its center.

5. The downhole core drilling anti-water-rush device according to claim 4, characterized in that: The top of the double-layer sealing rubber seat (2) is symmetrically provided with pressure plates (4), and a second installation clearance groove (41) is provided on one side of the pressure plate (4).

6. The downhole core drilling anti-water-rush device according to claim 5, characterized in that: The second mounting clearance groove (41) is located in a position corresponding to the first mounting clearance groove (21).

7. The downhole core drilling anti-water-rush device according to claim 1, characterized in that: The bottom of the protective support shell (1) is fixedly connected to the mounting base (13).

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