A high-pressure gushing water downhole plugging device

Abstract

The utility model discloses a high pressure water gushing downhole plugging device, including the wood plug, the first mounting hole is seted up in the wood plug, the first mounting hole is slidably connected with the mandrel, one end of mandrel is fixedly connected with the taper shaft, the taper shaft is sleeved with the expansion sleeve, and the expansion sleeve is arranged at one end of the wood plug, the other end of wood plug is installed with fixed component, and the mandrel is installed in the fixed component, the utility model discloses three layer plugging design, with fixed component as first layer plugging, expansion sleeve as second layer plugging, wood plug as third layer plugging, fixed component can be automatically clamped in the drilling through the dog, and then through the mandrel of pulling up, can make expansion sleeve open and adhere to the hole wall, make the whole device lock in the drilling, the outer diameter of wood plug expands after long time of soaking, can be closely attached with the hole wall, therefore compared with prior art plugging device, the utility model discloses simple operation, and has better sealing property and durability.

Description

Technical Field

[0001] This utility model relates to the field of drilling engineering technology, and in particular to a drilling sealing device under high pressure water inrush. Background Technology

[0002] In geological exploration, borehole plugging is generally used for intermediate and final plugging. In cases of high-pressure water inrush, intermediate plugging ensures the smooth progress of subsequent borehole testing. This condition places strict requirements on the safety and durability of the plugging, ensuring that the plugging device is not flushed out by the water inrush and that the plugging is durable. Currently, bridge plugs and packers are the most commonly used mechanical plugging devices. They achieve wellbore isolation by compressing rubber or metal components. However, they have the following drawbacks in practical applications: 1. The plugging effect depends on the integrity of the wellbore: They are extremely sensitive to wellbore corrosion, deformation, or scaling, resulting in a high risk of seal failure; 2. Poor plugging durability: Rubber materials are prone to aging, and their lifespan is significantly shortened under high temperature and pressure conditions, making it difficult to meet the long-term plugging requirements of deep formations and high-pressure water; 3. Operational complexity: They require specialized setting tools, and the accuracy and success rate of lowering the plugging device are low in deep well operations. Utility Model Content

[0003] The purpose of this invention is to provide a high-pressure water inrush drilling sealing device to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-pressure water inrush drilling sealing device, comprising a wooden plug, a first mounting hole being provided in the wooden plug, a mandrel being slidably connected in the first mounting hole, a tapered shaft being fixedly connected to one end of the mandrel, an expansion sleeve being sleeved on the tapered shaft, and the expansion sleeve being disposed at one end of the wooden plug, and a fixing component being installed at the other end of the wooden plug, and the mandrel being installed in the fixing component.

[0005] Preferably, the wooden plug has multiple grooves evenly distributed on it.

[0006] Preferably, one end of the expansion sleeve has a plurality of first notches evenly distributed, and the other end has a plurality of second notches evenly distributed, with the second notches and the first notches spaced apart, and both the second notches and the first notches having through holes.

[0007] Preferably, the fixing component includes a shaft, an external thread, a second mounting hole, a limiting groove, a second mounting slot, a pawl, a connecting shaft, and a spring. The shaft is threaded into the first mounting hole, the shaft has a second mounting hole, and the spindle is slidably connected to the second mounting hole. Multiple second mounting slots are evenly distributed on the shaft. A pawl is hinged in the second mounting slot, and a spring is fixedly connected to the pawl. The other end of the spring is fixedly connected to the second mounting slot.

[0008] Preferably, the shaft body is provided with an external thread, and the first mounting hole is provided with an internal thread, and the internal thread is threadedly connected to the external thread.

[0009] Preferably, a connecting shaft is fixedly connected to the claw, and the connecting shaft is hinged in the second mounting groove.

[0010] Preferably, the mandrel has a first mounting groove, a limiting member is provided in the first mounting groove, and a limiting groove is provided in the second mounting hole, with the limiting member being provided in the limiting groove.

[0011] This utility model provides a high-pressure water inrush drilling plugging device, the advantages of which are: this utility model adopts a three-layer plugging design, with a fixing component as the first layer of plugging, an expansion sleeve as the second layer of plugging, and a wooden plug as the third layer of plugging. The fixing component can be automatically locked in the drill hole by the claws, and the expansion sleeve can be opened and fitted to the hole wall by pulling up the mandrel, so that the entire device is locked in the drill hole. After being soaked for a long time, the outer diameter of the wooden plug naturally expands and can fit tightly to the hole wall. Therefore, compared with the existing plugging devices, this utility model is simple to operate and has better sealing and durability. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

[0015] Figure 3 for Figure 2 Enlarged view of the structure of region A in the middle;

[0016] Figure 4 This is a schematic diagram of the three-dimensional structure of the wooden plug of this utility model;

[0017] Figure 5 This is a three-dimensional structural diagram of the tapered shaft of this utility model;

[0018] Figure 6 This is a three-dimensional structural diagram of the fixing component of this utility model.

[0019] In the diagram: 1. Cork; 11. Groove; 12. First mounting hole; 13. Internal thread; 2. Expansion sleeve; 21. First notch; 22. Second notch; 23. Through hole; 3. Tapered shaft; 31. Mandrel; 32. First mounting groove; 33. Limiting component; 4. Fixing assembly; 41. Shaft body; 42. External thread; 43. Second mounting hole; 44. Limiting groove; 45. Second mounting groove; 46. Claw; 47. Connecting shaft; 48. Spring. Detailed Implementation

[0020] 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 embodiments of this utility model, not all embodiments. 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.

[0021] Please see the appendix Figure 1 - Appendix Figure 6This utility model provides an embodiment of a high-pressure water inrush drilling sealing device, comprising a wooden plug 1, a first mounting hole 12 inside the wooden plug 1, a mandrel 31 slidably connected inside the first mounting hole 12, a tapered shaft 3 fixedly connected to one end of the mandrel 31, an expansion sleeve 2 sleeved on the tapered shaft 3, and the expansion sleeve 2 disposed at one end of the wooden plug 1; a fixing component 4 is installed at the other end of the wooden plug 1, and the mandrel 31 is installed inside the fixing component 4; the first mounting hole 12 is used to accommodate the mandrel 31 and the tapered shaft 3; the mandrel 31 is used to pull the tapered shaft 3; the tapered shaft 3 is used to expand the expansion sleeve 2; the fixing component 4 is used to lock the device inside the borehole and serves as the first layer of sealing; the expansion sleeve 2 serves as... For the second layer of sealing, the wooden plug 1 serves as the third layer of sealing; the wooden plug 1 has multiple grooves 11 evenly distributed on it, and the grooves 11 are expansion grooves of the wooden plug 1; one end of the expansion sleeve 2 has multiple first notches 21 evenly distributed on it, and the other end has multiple second notches 22 evenly distributed on it, with the second notches 22 and the first notches 21 spaced apart, and both the second notches 22 and the first notches 21 have through holes 23, the first notches 21, the second notches 22 and the through holes 23 are used to enhance the expansion performance of the expansion sleeve 2; the fixing assembly 4 includes a shaft 41, an external thread 42, a second mounting hole 43, a limiting groove 44, a second mounting groove 45, a claw 46, a connecting shaft 47 and a spring 48, and the shaft 41 is threadedly connected to the first Within the mounting hole 12, a second mounting hole 43 is formed in the shaft body 41, and the mandrel 31 is slidably connected within the second mounting hole 43. Multiple second mounting grooves 45 are evenly distributed on the shaft body 41, and a pawl 46 is hinged within each second mounting groove 45. A spring 48 is fixedly connected to the pawl 46, and the other end of the spring 48 is fixedly connected within the second mounting groove 45. The second mounting hole 43 is used to accommodate the mandrel 31, and the second mounting groove 45 is used to mount the pawl 46. The spring 48 provides elasticity to the pawl 46, and the pawl 46 locks the shaft body 41 within the drilled hole. An external thread 42 is formed on the shaft body 41, and an internal thread 13 is formed within the first mounting hole 12. The internal thread 13 is connected to the external thread 42 and engages with the external thread 42 to achieve the threaded connection between the wooden plug 1 and the shaft 41. A connecting shaft 47 is fixedly connected to the jaw 46 and is hinged in the second mounting groove 45. The connecting shaft 47 is used to achieve the hinge between the jaw 46 and the second mounting groove 45. A first mounting groove 32 is provided on the mandrel 31, and a limiting member 33 is provided in the first mounting groove 32. A limiting groove 44 is provided in the second mounting hole 43, and the limiting member 33 is provided in the limiting groove 44. The first mounting groove 32 is used to install the limiting member 33. The limiting member 33 engages with the limiting groove 44 to restrict the rotation of the mandrel 31 so that the mandrel 31 can be disengaged from the drill rod.

[0022] Working principle: When using this utility model, the fixing component 4, combined with the expansion sleeve 2, locks the device in the drill hole, serving as the base layer for sealing the drill hole. The fixing component 4 is the first layer of sealing, the expansion sleeve 2 is the second layer of sealing, and the wooden plug 1, after being soaked for a long time, will fit tightly against the hole wall, serving as the third layer of sealing, thus sealing the drill hole. The specific operation method is as follows: The mandrel 31 is installed on the drill rod through a threaded connection. The device is lowered to the designated position in the drill hole using the drill rod, and then the drill rod is lifted. Under the elastic action of the spring 48, the chuck 46 is in an open state, which can hook onto the inner wall of the drill hole, preventing the shaft 41 from moving upward. The drill rod drives the mandrel 31 to move upward, and the mandrel 31 drives the tapered shaft 3. Since the expansion sleeve 2 is blocked by the shaft 41, as the tapered shaft 3 moves upward, the expansion sleeve 2 will gradually be stretched open, thus fitting against the inner wall of the drill hole. At this point, the drill rod can be rotated and moved upwards, causing the mandrel 31 to disengage from the drill rod. The wooden plug 1, after absorbing water and expanding, will seal the borehole. The groove 11 is the expansion groove for the wooden plug 1. The first mounting hole 12 is used to accommodate the mandrel 31 and the tapered shaft 3. The internal thread 13 engages with the external thread 42 to achieve a threaded connection between the wooden plug 1 and the shaft 41. The first notch 21, the second notch 22, and the through hole 23 enhance the expansion performance of the expansion sleeve 2. The first mounting groove 32 is used to install the limiting member 33, which engages with the limiting groove 44 to restrict the rotation of the mandrel 31, facilitating its disengagement from the drill rod. The second mounting hole 43 accommodates the mandrel 31. The connecting shaft 47 is used to achieve the hinge connection between the chuck 46 and the second mounting groove 45. A specific application example is as follows: A water conservancy project has a borehole diameter of 76mm and a water inflow of 72m³ / h. 3 Most of the water inflow section comes from 1650m to 2000m. Actual measurements show that the pressurized water pressure reaches 8MPa at a depth of approximately 1700m. To obtain the formation characteristics, a series of comprehensive borehole tests need to be conducted at 1600m. Therefore, the 1650m section needs to be permanently sealed to ensure the smooth progress of subsequent comprehensive borehole tests. Applying this device to this project, its specific parameters are as follows: the outer diameter of the shaft 41 is 60mm; the length of the chuck 46 is 46.5mm, and its thickness is 13mm; the bottom surface of the second mounting groove 45 is 12mm from the center of the shaft 41; the chuck 46 is installed close to the bottom surface of the second mounting groove 45, so the extension distance of the chuck 46 is 26mm. According to trigonometric functions, the chuck 46 will contact the borehole wall after extending approximately 34°; the outer diameter of the wooden plug 1 is 75mm, made of birch wood, and its diameter after expansion is approximately 79.5mm. After long-term soaking, the outer diameter of the birch wood can reach a maximum of 81mm, meeting the sealing requirements.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-pressure water inrush drilling plugging device, comprising a wooden plug (1), characterized in that: The wooden plug (1) has a first mounting hole (12) inside, and a mandrel (31) is slidably connected inside the first mounting hole (12). One end of the mandrel (31) is fixedly connected to a tapered shaft (3), and an expansion sleeve (2) is sleeved on the tapered shaft (3). The expansion sleeve (2) is located at one end of the wooden plug (1), and a fixing component (4) is installed at the other end of the wooden plug (1). The mandrel (31) is installed inside the fixing component (4).

2. The high-pressure water inrush drilling plugging device according to claim 1, characterized in that: The wooden plug (1) has multiple grooves (11) evenly distributed on it.

3. The high-pressure water inrush drilling plugging device according to claim 1, characterized in that: The expansion sleeve (2) has a plurality of first notches (21) evenly distributed at one end and a plurality of second notches (22) evenly distributed at the other end, and the second notches (22) and the first notches (21) are spaced apart, and through holes (23) are provided on both the second notches (22) and the first notches (21).

4. The high-pressure water inrush drilling plugging device according to claim 1, characterized in that: The fixing component (4) includes a shaft (41), an external thread (42), a second mounting hole (43), a limiting groove (44), a second mounting groove (45), a claw (46), a connecting shaft (47), and a spring (48). The shaft (41) is threaded into the first mounting hole (12). The shaft (41) has a second mounting hole (43) and the spindle (31) is slidably connected into the second mounting hole (43). The shaft (41) has multiple second mounting grooves (45) evenly distributed on it. The claw (46) is hinged in the second mounting groove (45). The spring (48) is fixedly connected to the claw (46), and the other end of the spring (48) is fixedly connected into the second mounting groove (45).

5. The high-pressure water inrush drilling plugging device according to claim 4, characterized in that: The shaft (41) is provided with an external thread (42), and the first mounting hole (12) is provided with an internal thread (13), and the internal thread (13) is threadedly connected to the external thread (42).

6. The high-pressure water inrush drilling plugging device according to claim 4, characterized in that: A connecting shaft (47) is fixedly connected to the claw (46), and the connecting shaft (47) is hinged in the second mounting groove (45).

7. The high-pressure water inrush drilling plugging device according to claim 4, characterized in that: The spindle (31) is provided with a first mounting groove (32), a limiting member (33) is provided in the first mounting groove (32), and a limiting groove (44) is provided in the second mounting hole (43), and the limiting member (33) is provided in the limiting groove (44).

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