Anti-sloughing support device for middle-deep geothermal well

Abstract

The utility model discloses a kind of middle-deep geothermal well anti-sloughing supporting devices, it is related to geothermal drilling technical field;And the utility model includes including first casing and second casing, joint assembly is fixedly connected between the first casing and second casing, the upper end of the second casing is equipped with supporting device, the supporting device includes fixed frame, the fixed frame one side symmetrical rotation is connected with jaw, the fixed frame one side fixed mounting has hydraulic cylinder, the transmission head one side symmetrical rotation is connected with connecting rod, the inner wall of two the connecting rod one end respectively with two jaws is rotatably connected, the end of two the jaw and the end of transmission head are all fixedly installed with positioning plate, the utility model cooperates by setting joint assembly and supporting device, to provide stable guide when facilitating up and down casing is achieved, and the effect of facilitating connection casing.

Description

Technical Field

[0001] This utility model relates to the field of geothermal drilling technology, specifically to a collapse prevention support device for medium-deep geothermal wells. Background Technology

[0002] Medium-deep geothermal wells are drilled wells used to extract medium-deep geothermal resources and are a key infrastructure for geothermal energy development. They primarily extract geothermal energy from depths ranging from hundreds to thousands of meters underground. The temperature of geothermal resources at this depth is generally between 30℃ and 150℃, belonging to medium-low temperature geothermal resources, and can be widely used in heating, cooling, industrial processing, agricultural greenhouses, and hot spring tourism. Medium-deep geothermal well anti-collapse support devices are specialized equipment designed to ensure the stability of the wellbore during construction and extraction, preventing collapse. These devices are categorized into mechanical support, grouting reinforcement, and chemical wall-stabilizing types. Among them, steel casing serves as a permanent support structure for the wellbore. After being cemented with cement slurry, it forms an integral part with the formation, supporting the wellbore and isolating different strata.

[0003] Currently, traditional casing connection methods mostly use a single flange bolt or welding structure. During installation, manual precise hole alignment and multiple coaxiality calibrations are required, which is cumbersome and time-consuming. Especially in the damp and confined space downhole, the connection efficiency is low, and misalignment can easily lead to poor sealing or stress concentration, affecting the overall stability of the casing. Furthermore, during the lowering and raising of the casing, the device slides against the well wall or casing surface, which not only results in high resistance and energy consumption but also accelerates component wear. Moreover, it cannot effectively correct the offset during the casing lowering process, leading to high verticality error, which can easily cause jamming accidents during deep hole operations. Utility Model Content

[0004] To address the issues of inconvenience in lowering and connecting the casing, the purpose of this utility model is to provide a collapse-prevention support device for medium-deep geothermal wells.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a medium-deep geothermal well anti-collapse support device, comprising a first casing and a second casing, a joint assembly fixedly connected between the first casing and the second casing, a support device provided at the upper end of the second casing, the support device comprising a fixed frame, a clamping jaw symmetrically and rotatably connected to one side of the fixed frame, a hydraulic cylinder fixedly installed on one side of the fixed frame, a transmission head fixedly connected to the output end of the hydraulic cylinder, connecting rods symmetrically and rotatably connected to one side of the transmission head, one end of each of the two connecting rods being rotatably connected to the inner wall of the two clamping jaws respectively, and positioning plates fixedly installed at the ends of the two clamping jaws and the end of the transmission head.

[0006] Preferably, the connector assembly includes a male connector and a female connector. The upper surface of the male connector is fixedly connected to the bottom end of the second protective sleeve, and the lower surface of the female connector is fixedly connected to the upper end of the first protective sleeve. The outer surface of the male connector has multiple threaded holes, and the outer surface of the female connector has multiple mounting holes. The threaded holes and mounting holes are arranged in a circular array and are used in conjunction with each other.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves rapid coaxial connection of the protective sleeve by setting a dual-positioning joint assembly and a clamp-type support device. The bolt connection and embedded structure of the joint assembly ensure the stability of the connection, while the pulley guide and anti-slip clamp design of the support device reduce the lowering resistance and improve the positioning accuracy. Attached Figure Description

[0008] 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 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.

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] Figure 2 This is a schematic diagram of the support device structure of this utility model.

[0011] Figure 3 This is a schematic diagram of the connector assembly structure of this utility model.

[0012] In the diagram: 11. First casing; 12. Second casing; 13. Connector assembly; 14. Support device; 15. Fixing frame; 16. Gripper; 17. Hydraulic cylinder; 18. Transmission head; 19. Connecting rod; 20. Positioning plate; 21. Male connector; 22. Threaded hole; 23. Connecting plate; 24. Mounting hole; 25. Connecting groove; 26. Female connector. Detailed Implementation

[0013] 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.

[0014] Example: Figure 1-3As shown, this utility model provides a collapse prevention support device for medium-deep geothermal wells, including a first casing 11 and a second casing 12. Both the first casing 11 and the second casing 12 are made of low-alloy high-strength steel and have the same diameter. The bottom end of the first casing 11 has an annular inclined surface. When the casing is lowered, this annular inclined surface effectively reduces friction with the well wall, while also facilitating alignment and positioning, ensuring the casing is smoothly lowered to the predetermined position.

[0015] The first protective sleeve 11 and the second protective sleeve 12 are fixedly connected by a connector assembly 13. The connector assembly 13 includes a male connector 21 and a female connector 26. The upper surface of the male connector 21 is fixed to the bottom end of the second protective sleeve 12, and the lower surface of the female connector 26 is fixed to the upper end of the first protective sleeve 11. The threaded holes 22 distributed in an annular array on the outer surface of the male connector 21 are bolted to the mounting holes 24 of the female connector 26 to achieve axial fixation. The connecting plate 23 of the male connector 21 is embedded in the connecting groove 25 of the female connector 26 to restrict relative rotation. Furthermore, the outer diameter of the male connector 21 is smaller than the inner diameter of the female connector 26, and their outer surfaces slide against each other, facilitating quick coaxial alignment during installation.

[0016] The upper end of the second protective casing 12 is provided with a support device 14. The support device 14 includes a fixed frame 15, and a clamping jaw 16 is symmetrically rotatably connected to one side of the fixed frame 15. The inner diameter of the clamping jaw 16 when closed is smaller than the outer diameter of the protective casing, and the inner diameter when open is larger than the outer diameter of the protective casing. It can open to allow the protective casing to pass through when it is lowered, and close to hold the protective casing tightly when it is in place. The hydraulic cylinder 17 on the fixed frame 15 transmits power to the clamping jaw 16 through the transmission head 18 and the connecting rod 19 to realize the opening and closing action. The positioning plate 20 at the end of the clamping jaw 16 and the transmission head 18 is arc-shaped. The inner arc surface is adapted to the outer surface of the protective casing, and the rectangular array of pulleys on the outer surface forms a rolling friction pair when the protective casing is lowered, which can reduce resistance and provide vertical guidance.

[0017] Positioning plates 20 are fixedly installed at the ends of the two grippers 16 and the end of the transmission head 18. All three positioning plates 20 are arc-shaped, and their precise curvature design perfectly matches the outer surface of the protective casing. This ensures that when the grippers 16 clamp the protective casing, the positioning plates 20 can fit tightly against the casing surface, thereby evenly distributing pressure and avoiding localized stress concentration. Multiple pulleys arranged in a rectangular array are rotatably connected to the outer surface of the positioning plates 20. During the lowering process of the protective casing, these pulleys contact the casing surface and form a rolling friction pair, making the lowering process smoother and more stable, effectively preventing the casing from shifting or tilting during descent, and ensuring that it accurately reaches the predetermined position.

[0018] Working principle: First, the first casing 11 is lowered into the geothermal well to a predetermined depth using hoisting equipment. Its bottom is an annular inclined surface, which effectively reduces friction with the well wall during lowering and facilitates alignment and positioning. Then, the second casing 12 is lowered and connected to the first casing 11 via the connector assembly 13. The threaded hole 22 on the male connector 21 corresponds to the mounting hole 24 on the female connector 26. Bolts are passed through and tightened to achieve axial fixation. The connecting plate 23 on the outer surface of the male connector 21 is embedded in the connecting groove 25 of the female connector 26, restricting relative rotation between the casings and ensuring connection stability. Furthermore, the outer diameter of the male connector 21 is smaller than the inner diameter of the female connector 26; their sliding fit design allows for quick coaxial alignment during installation. When the device is lowered into the well, the casing first passes through the open gripper 16 until it reaches the predetermined position. At this time, the support device 14 is located outside the casing, and the output end of the hydraulic cylinder 17 begins to extend, pulling the gripper 16 inward through the connecting rod 19, so that the positioning plate 20 gradually approaches the outer surface of the casing. During the process of the gripper 16 closing, the pulley on the outer surface of the positioning plate 20 first contacts the surface of the casing. At this time, the inner arc surface of the positioning plate 20 is completely in contact with the outer surface of the casing, forming a rolling friction pair, reducing the lowering resistance. By clamping and fitting the casing, the casing is kept stable during the descent, providing vertical guidance for the casing to move downward.

[0019] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A collapse prevention support device for medium-deep geothermal wells, comprising a first casing (11) and a second casing (12), characterized in that: A connector assembly (13) is fixedly connected between the first protective sleeve (11) and the second protective sleeve (12), and a support device (14) is provided at the upper end of the second protective sleeve (12). The support device (14) includes a fixed frame (15), a clamp (16) is symmetrically rotatably connected to one side of the fixed frame (15), a hydraulic cylinder (17) is fixedly installed on one side of the fixed frame (15), a transmission head (18) is fixedly connected to the output end of the hydraulic cylinder (17), a connecting rod (19) is symmetrically rotatably connected to one side of the transmission head (18), one end of the two connecting rods (19) is rotatably connected to the inner wall of the two clamps (16) respectively, and a positioning plate (20) is fixedly installed on the end of the two clamps (16) and the end of the transmission head (18).

2. The anti-collapse support device for medium-deep geothermal wells as described in claim 1, characterized in that, The connector assembly (13) includes a male connector (21) and a female connector (26). The upper surface of the male connector (21) is fixedly connected to the bottom end of the second protective sleeve (12), and the lower surface of the female connector (26) is fixedly connected to the upper end of the first protective sleeve (11). The outer surface of the male connector (21) is provided with multiple threaded holes (22), and the outer surface of the female connector (26) is provided with multiple mounting holes (24). The threaded holes (22) and the mounting holes (24) are arranged in a ring array, and the threaded holes (22) and the mounting holes (24) are used in conjunction.

3. The anti-collapse support device for medium-deep geothermal wells as described in claim 1, characterized in that, The multiple positioning plates (20) are all arc-shaped, and the inner arc surface of the positioning plate (20) is adapted to the outer surface of the protective cylinder. The outer surface of the positioning plate (20) is rotatably connected to multiple pulleys, which are distributed in a rectangular array.

4. The anti-collapse support device for medium-deep geothermal wells as described in claim 1, characterized in that, Both the first casing (11) and the second casing (12) are made of low-alloy high-strength steel.

5. The anti-collapse support device for medium-deep geothermal wells as described in claim 2, characterized in that, The outer surface of the male connector (21) is fixedly equipped with multiple connecting plates (23), which are arranged in a ring array. The outer surface of the female connector (26) is provided with multiple connecting grooves (25), and the outer surface of the connecting plates (23) is embedded in the connecting grooves (25).

6. The anti-collapse support device for medium-deep geothermal wells as described in claim 2, characterized in that, The outer diameter of the male connector (21) is smaller than the inner diameter of the female connector (26), and the outer surface of the male connector (21) slides and fits against the outer surface of the female connector (26).

7. The anti-collapse support device for medium-deep geothermal wells as described in claim 1, characterized in that, The first protective sleeve (11) and the second protective sleeve (12) have the same diameter, and the bottom end of the first protective sleeve (11) is an annular inclined surface.

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