Geothermal well casing pipe installation structure

Abstract

The invention discloses a geothermal well casing pipe installation structure, and relates to the technical field of well drilling accessory installation, the geothermal well casing pipe installation structure comprises a vertical mechanism and a concentric mechanism, an inner supporting ring is provided with a supporting mechanism used for centering and supporting a pipe fitting for feeding on the upper side; the middle of the inner ring wall of the inner supporting ring is connected with an up-down sliding seat in an up-down sliding mode through a first spring, driving mechanisms which are located below the up-down sliding seat and are symmetrically distributed up and down are arranged on the inner ring wall of the inner supporting ring, and concentric mechanisms which are symmetrically distributed up and down are arranged on the inner ring wall of the inner supporting ring. The device can adapt to the situation that the nearby ground is uneven, the situation that the guiding direction is not perpendicular due to the uneven ground is avoided, and the use flexibility of the device is improved; the arc-shaped guide grooves in the supporting plates guide the hoisted to-be-installed pipeline to the middle of the inner supporting ring, the multiple supporting plates support the upper pipeline in multiple directions, and the stability in the moving process is improved; and the concentricity and the perpendicularity of the installed pipeline in the downward moving process are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of installation of drilling accessories, and particularly to an installation structure for a geothermal well casing. Background Art

[0002] A geothermal well casing is an important drilling accessory used in the process of geothermal well drilling, mainly used to protect the wellbore and ensure the safety and stability of the drilling process. The installation steps of a geothermal well casing usually include: lowering the first conduit, assembling the casing string, and lowering the casing string, etc.

[0003] Currently, during the installation process of a geothermal well casing, before starting to install the main casing, usually a section of conduit is first lowered into the well to guide the subsequent casing to be correctly positioned. A guiding device is set at the wellhead position, and then multiple sections of casing are sequentially connected into a complete casing string through a casing tong. Finally, the assembled casing string is slowly lowered to a predetermined depth using a drilling rig or a special lowering device; however, if the ground at the wellhead position is uneven, it will cause the guiding ring or guiding frame to be installed inaccurately, and then the angle of guiding the casing into the well will deviate, and the verticality of the casing cannot be guaranteed, thus affecting the connection accuracy between the casings; secondly, the existing common lifting methods include lifting by a drilling rig winch or a hydraulic lifting device. The lifting by a drilling rig winch has high flexibility, but the accuracy and stability during lowering need to be improved. The hydraulic lifting device has high accuracy during lowering, but the cost is relatively high, the setting and debugging time is long, and the flexibility is not high; furthermore, the instability of the installed pipeline during the downward movement will cause the pipeline to bend, and then the docking of the next section of pipeline will be misaligned, and the concentricity and verticality of the installed pipeline during the downward movement cannot be guaranteed.

[0004] Therefore, in order to improve the accuracy and stability of the equipment and ensure the concentricity and verticality throughout the installation process, the present invention provides an installation structure for a geothermal well casing. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art, and a geothermal well casing installation structure is proposed.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A geothermal well casing installation structure includes a vertical mechanism and a concentric mechanism. The vertical mechanism includes an inner support ring, and a middle support ring is sleeved outside the inner support ring. The inner support ring and the middle support ring are rotationally connected through two symmetrically arranged front and rear rotating shafts one. An outer support ring is sleeved outside the middle support ring, and the middle support ring and the outer support ring are rotationally connected through two symmetrically arranged left and right rotating shafts two. A plurality of outer positioning members are assembled on the outer ring wall of the outer support ring along the circumferential direction, and inner positioning members are assembled on the inner support ring.

[0007] A supporting mechanism for centering and supporting the pipe fittings for upper-side feeding is arranged on the inner supporting ring. The middle part of the inner ring wall of the inner supporting ring is connected with an up-and-down sliding seat through a first spring in a vertically sliding manner. Driving mechanisms which are symmetrically distributed up and down and are located below the up-and-down sliding seat are arranged on the inner ring wall of the inner supporting ring. Concentric mechanisms which are symmetrically distributed up and down are arranged on the inner ring wall of the inner supporting ring.

[0008] The concentric mechanism includes a fixed clamping component arranged on the inner supporting ring for concentric alignment and fixed clamping of the butt joint ends of the pipe fittings. A sliding clamping component for maintaining concentric alignment during the movement of the lower pipe after the butt joint of the pipe fittings is arranged on the fixed clamping component.

[0009] In the above-mentioned geothermal well casing installation structure, the outer positioning member is composed of an electric push rod hinged to the outer ring wall of the outer supporting ring, a support hinged to the side of the electric push rod far away from the outer supporting ring, and a first grounding nail connected to the support. The inner positioning member is composed of a plurality of second grounding nails circumferentially distributed and engaged with the inner supporting ring and a first ring member fixedly connected to the tops of the plurality of second grounding nails.

[0010] In the above-mentioned geothermal well casing installation structure, the supporting mechanism includes a supporting plate. A plurality of supporting plates are hinged to the top wall of the inner supporting ring along the circumferential direction. Arc-shaped guide grooves facing up and down are formed on the sides of the plurality of supporting plates close to the central axis of the inner supporting ring. A plurality of first balls are rotatably connected to the tops of the arc-shaped guide grooves. Rectangular grooves facing up and down are formed in the middle of the arc-shaped guide grooves. A traction steel cable installed on the supporting plate is arranged in the rectangular grooves.

[0011] In the above-mentioned geothermal well casing installation structure, the upper concentric mechanism is arranged above the up-and-down sliding seat, and the lower concentric mechanism is arranged below the lower driving mechanism. The fixed clamping component includes a butt joint ring. The upper butt joint ring is rotatably connected to the top wall of the up-and-down sliding seat, and the top wall of the upper butt joint ring is connected with the traction steel cable. A channel for connecting the traction steel cable and the butt joint ring is formed on the inner supporting ring. The lower butt joint ring is fixedly connected to the inner ring wall of the inner supporting ring. A rotating member is rotatably connected to the inside of the butt joint ring through an electric slider.

[0012] In the above-mentioned geothermal well casing installation structure, the rotating member is composed of two second ring members distributed up and down and a plurality of vertical plates circumferentially fixed to the outer ring walls of the two second ring members. A plurality of inverted U-shaped pushing members slidably connected circumferentially through second springs are circumferentially distributed on the common inner ring walls of the two second ring members. The sides of the two horizontal sections of the inverted U-shaped pushing member far away from the rotating member are inclined. A plurality of fixed clamping members corresponding to the inverted U-shaped pushing members are radially slidably connected to the inner ring wall of the butt joint ring through third springs. The sides of the fixed clamping members close to the rotating member are inclined to be adapted to the inclined side walls of the inverted U-shaped pushing member. The sides of the fixed clamping members far away from the rotating member are arc-shaped, and rubber pads can be arranged on the arc-shaped surfaces to increase the friction force.

[0013] In the above-mentioned geothermal well casing installation structure, the sliding clamping assembly includes a rotating ring. There is a rotating ring rotatably connected between two second circular ring members through electric sliders. The inner circumferential wall of the rotating ring is fixedly connected with a limiting plate group circumferentially. The limiting plate group includes two symmetrically distributed limiting plates, and the two limiting plates limit the middle vertical section of the inverted U-shaped pushing member.

[0014] In the above-mentioned geothermal well casing installation structure, a sliding clamping member is slidably connected inside the fixed clamping member through a fourth spring. The sliding clamping member is composed of a sliding seat slidably connected radially along the docking ring inside the fixed clamping member and a plurality of third balls rotatably connected to one side of the sliding seat away from the rotating member. A first wedge block is fixedly connected to one side of the sliding seat close to the rotating member.

[0015] In the above-mentioned geothermal well casing installation structure, a locking assembly is arranged on the fixed clamping assembly. The locking assembly includes a support frame. The support frame is slidably connected up and down through a fifth spring inside the vertical plate of the rotating member. On the side of the vertical section of the inverted U-shaped pushing member away from the fixed clamping member, there are vertically distributed convex blocks. A plurality of positioning holes penetrating up and down are opened on the convex blocks. A locking block fixedly connected to the support frame and engaging with the positioning holes through a part of the rotating member is provided.

[0016] In the above-mentioned geothermal well casing installation structure, the driving mechanism includes a hydraulic rod. A plurality of symmetrically arranged hydraulic rods are installed inside the inner support ring. The output ends of the hydraulic rods on the same side up and down are fixedly connected together with an annular plate slidably connected to the inner circumferential wall of the inner support ring up and down.

[0017] In the above-mentioned geothermal well casing installation structure, a plurality of ejector rods are fixedly connected circumferentially to the outer circumferential wall of the annular plate close to the rotating member. The ejector rods correspond to the fixed clamping members. The end of the ejector rod away from the annular plate is fixedly connected with a second wedge block corresponding to the first wedge block. A slot for the annular plate and the ejector rods to slide up and down is opened on the fixed clamping member.

[0018] Compared with the existing technology, the advantages of the present invention are as follows: 1. Through the cooperation of the vertical mechanism and the concentric mechanism, concentric and vertical calibration are carried out with the first pipe as the reference. The middle support ring and the outer support ring provide stable support for the inner support ring, ensuring the perpendicularity of the subsequent pipe connections, adapting to the uneven ground near the first pipe, avoiding the non-perpendicular guiding direction caused by the uneven ground, and improving the use flexibility of the equipment.

[0019] 2. By cooperating the supporting mechanism and the concentric mechanism, before the upper and lower pipes are connected, the arc-shaped guiding grooves on the supporting plate guide the pipe to be installed during hoisting towards the middle of the inner support ring; when the upper and lower pipes are connected, the docking ring drives the traction steel cable to move downward, and the traction steel cable pulls the corresponding supporting plate from the initial state where the upper ends are far away to the state where the upper ends are close. Multiple supporting plates support the upper pipe in multiple directions, improving the stability of the upper pipe during downward movement.

[0020] 3. By cooperating the driving mechanism and the concentric mechanism, during the docking of two pipe fittings, multiple fixed clamping parts perform concentric calibration on the pipe from multiple directions and stably clamp it. After the docking of the two pipe fittings is completed, the driving mechanism drives the concentric mechanism to change the clamping state of the pipe from relatively fixed clamping to relatively sliding clamping, so as to ensure the concentricity and perpendicularity of the installed pipe during downward movement; at the same time, the driving mechanism adjusts the movement of the balls of the sliding clamping part, making it always keep close to the side walls of the upper and lower corresponding pipes to adapt to the change in the pipe diameter at the connecting end of the pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, where:

[0022] Figure 1 is a schematic structural diagram of the whole.

[0023] Figure 2 is a schematic structural diagram of the middle support ring and the outer support ring after adapting to the terrain.

[0024] Figure 3 is a schematic top view structural diagram of the vertical mechanism.

[0025] Figure 4 is a schematic cross-sectional structural diagram of the inner support ring.

[0026] Figure 5 is a schematic diagram of the change of the traction steel cable before and after being stressed.

[0027] Figure 6 is a partial schematic structural diagram of the concentric mechanism.

[0028] Figure 7 is a partial schematic top view structural diagram of the fixed clamping mechanism.

[0029] Figure 8 is a schematic diagram of the change of the sliding clamping part before and after docking with the ejector rod.

[0030] Figure 9 is a schematic cross-sectional structural diagram of the docking ring and the rotating ring.

[0031] Figure 10 is a schematic diagram of the change of the support frame and the annular plate before and after movement.

[0032] Figure 11 It is a structural schematic diagram before the butt joint of two pipe fittings.

[0033] In the figure: 1. Vertical mechanism; 11. Inner support ring; 12. Middle support ring; 13. Outer support ring; 14. Inner positioning member; 15. Outer positioning member; 2. Supporting mechanism; 21. Supporting plate; 22. First ball; 23. Traction steel cable; 3. Upper and lower sliding seat; 4. Concentric mechanism; 41. Fixed clamping assembly; 411. Docking ring; 412. Rotating member; 413. Inverted U-shaped pushing member; 414. Fixed clamping member; 42. Sliding clamping assembly; 421. Rotating ring; 422. Limiting plate group; 423. Sliding clamping member; 424. First wedge block; 43. Locking assembly; 431. Support frame; 432. Locking block; 5. Driving mechanism; 51. Hydraulic rod; 52. Ring-shaped plate; 53. Thrust rod. Specific implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Referring to Figures 1 to 4 , a geothermal well casing installation structure includes a vertical mechanism 1 and a concentric mechanism 4. The vertical mechanism 1 includes an inner support ring 11. An outer middle support ring 12 is sleeved outside the inner support ring 11. The inner support ring 11 and the middle support ring 12 are rotationally connected by two symmetrically arranged first rotating shafts in the front and back. An outer support ring 13 is sleeved outside the middle support ring 12. The middle support ring 12 and the outer support ring 13 are rotationally connected by two symmetrically arranged second rotating shafts on the left and right. A plurality of outer positioning members 15 are assembled on the outer ring wall of the outer support ring 13 along the circumferential direction, and an inner positioning member 14 is assembled on the inner support ring 11; the outer positioning member 15 is composed of an electric push rod hinged to the outer ring wall of the outer support ring 13, a support hinged to the side of the electric push rod away from the outer support ring 13, and a first ground nail connected to the support. The inner positioning member 14 is composed of a plurality of second ground nails circumferentially distributed and engaged with the inner support ring 11 and a first ring member fixedly connected to the tops of the plurality of second ground nails.

[0036] Referring to Figure 1 and Figure 4, a supporting mechanism 2 for centering and supporting the pipe for upper-side feeding is arranged on the inner supporting ring 11. The middle of the inner ring wall of the inner supporting ring 11 is connected with an up-and-down sliding seat 3 through a first spring (not shown in the figure) in a sliding manner up and down. Driving mechanisms 5 which are symmetrically distributed up and down and are located below the up-and-down sliding seat 3 are arranged on the inner ring wall of the inner supporting ring 11. Concentric mechanisms 4 which are symmetrically distributed up and down are arranged on the inner ring wall of the inner supporting ring 11.

[0037] First, place the first pipe in the wellbore for positioning, then sleeved the inner supporting ring 11 on the outer wall of the first pipe, and clamp it on the outer wall of the pipe after concentric alignment through the concentric mechanism 4 on the lower side. When the docking of the inner supporting ring 11 and the first pipe is completed, insert the inner positioning member 14 into the inner supporting ring 11 from top to bottom, connect the second grounding nail with the ground, and lock the position of the inner supporting ring 11 and the ground. Under the action of the earth's gravitational force, the outer supporting ring 13 adaptively rotates through the second rotating shaft on the outside of the middle supporting ring 12. Under the action of the earth's gravitational force, the middle supporting ring 12 adaptively rotates through the first rotating shaft on the outside of the inner supporting ring 11. The electric push rod extends to an appropriate height, pushes the support seat to the ground position near the first pipe, and connects the support seat with the ground through the first grounding nail to fix the positions of the inner supporting ring 11 and the outer supporting ring 13. The outer supporting ring 13 provides support for the inner supporting ring 11, ensuring the perpendicularity of subsequent pipe connections, and at the same time being able to adapt to the uneven ground near the first pipe, avoiding the non-perpendicular guiding direction caused by the uneven ground, and at the same time quickly completing concentric and vertical calibration, improving the use flexibility of the equipment.

[0038] When the installation of the first pipe and the vertical mechanism 1 is completed, lift the pipe to be installed by a lifting tool, and place it downward on the concentric mechanism 4 on the upper side inside the inner supporting ring 11 through the guidance of the supporting mechanism 2. After concentric alignment, the concentric mechanism 4 on the upper side clamps the pipe, and then clamp and rotate it for installation through an external casing tong (the casing tong is an existing device and will not be elaborated here). The pipe to be installed on the upper side gradually rotates into the first pipe on the lower side. The concentric mechanism 4 on the upper side is driven to rotate on the up-and-down sliding seat 3. The up-and-down sliding seat 3 gradually moves downward on the inner ring wall of the inner supporting ring 11 as the two pipes are threadedly connected. The up-and-down sliding seat 3 drives the supporting mechanism 2 to change its shape, and the supporting mechanism 2 continuously supports the upper part of the pipe to be installed.

[0039] After the upper and lower pipes are completely connected, the driving mechanism 5 drives the concentric mechanism 4 on the upper side to change from relatively fixed clamping to relatively sliding clamping of the upper pipe. At the same time, the driving mechanism 5 drives the concentric mechanism 4 on the lower side to change from relatively fixed clamping to relatively sliding clamping of the lower pipe. The upper pipe is pushed downward by the sling to drive the lower pipe. After the upper pipe gradually moves downward to overlap with the initial position of the lower pipe, the driving mechanism 5 resets to drive the concentric mechanisms 4 on the upper and lower sides to change back to the fixed clamping state, and the concentric mechanism 4 on the upper side resets to the initial unclamped state. This process is repeated to facilitate the continuous connection of multiple pipes.

[0040] Refer to Figure 1 and Figure 5 , the supporting mechanism 2 includes a supporting plate 21. A plurality of supporting plates 21 are hinged to the top wall of the inner support ring 11 along the circumferential direction. An arc-shaped guide groove facing up and down is formed on one side of each of the plurality of supporting plates 21 close to the central axis of the inner support ring 11. A plurality of first balls 22 are rotatably connected to the top of the arc-shaped guide groove. A rectangular groove facing up and down is formed in the middle of the arc-shaped guide groove, and a traction cable 23 installed on the supporting plate 21 is arranged in the rectangular groove.

[0041] Refer to Figure 4 and Figure 6 , the concentric mechanism 4 includes a fixed clamping component 41 arranged on the inner support ring 11 for concentric alignment and fixed clamping of the butt ends of pipe fittings. A sliding clamping component 42 for maintaining concentric alignment during the movement of the lower pipe after the butt joint of the pipe fittings is arranged on the fixed clamping component 41.

[0042] Refer to Figure 4 , Figure 6 and Figure 7, the concentric mechanism 4 on the upper side is arranged above the vertical sliding seat 3, and the concentric mechanism 4 on the lower side is arranged below the lower driving mechanism 5. The fixed clamping assembly 41 includes a docking ring 411. The docking ring 411 on the upper side is rotatably connected to the top wall of the vertical sliding seat 3. The top wall of the docking ring 411 on the upper side is connected to the traction steel cable 23. A channel for connecting the traction steel cable 23 and the docking ring 411 is provided on the inner support ring 11. The docking ring 411 on the lower side is fixedly connected to the inner ring wall of the inner support ring 11. A rotating member 412 is rotatably connected to the inside of the docking ring 411 through an electric slider; the rotating member 412 is composed of two circular ring members II distributed up and down and a plurality of vertical plates circumferentially fixed on the outer wall of the two circular ring members II. A plurality of inverted U-shaped pushing members 413 slidably connected circumferentially through springs II (not shown in the figure) are circumferentially distributed on the inner ring walls of the two circular ring members II. One side of the two horizontal sections of the inverted U-shaped pushing member 413 away from the rotating member 412 is inclined. A plurality of fixed clamping members 414 corresponding to the inverted U-shaped pushing member 413 are radially slidably connected to the inner ring wall of the docking ring 411 through springs III (not shown in the figure). One side of the fixed clamping member 414 close to the rotating member 412 is inclined to be adapted to the inclined side wall of the inverted U-shaped pushing member 413. One side of the fixed clamping member 414 away from the rotating member 412 is arc-shaped, and a rubber pad can be arranged on the arc-shaped surface to increase the friction force.

[0043] Refer to Figure 6 , Figure 8 and Figure 9 , the sliding clamping assembly 42 includes a rotating ring 421. The rotating ring 421 is rotatably connected between the two circular ring members II through an electric slider. A limiting plate group 422 is circumferentially fixedly connected to the inner ring wall of the rotating ring 421. The limiting plate group 422 includes two symmetrically distributed limiting plates, and the two limiting plates limit the middle vertical section of the inverted U-shaped pushing member 413; a sliding clamping member 423 is slidably connected to the inside of the fixed clamping member 414 through a spring IV (not shown in the figure). The sliding clamping member 423 is composed of a sliding seat slidably connected to the inside of the fixed clamping member 414 along the radial direction of the docking ring 411 and a plurality of ball bearings III rotatably connected to one side of the sliding seat away from the rotating member 412. A wedge block 424 is fixedly connected to one side of the sliding seat close to the rotating member 412.

[0044] Refer to Figure 6 , Figures 9 to 10 , a locking assembly 43 is arranged on the fixed clamping assembly 41. The locking assembly 43 includes a support frame 431. The support frame 431 is slidably connected up and down through a spring V (not shown in the figure) inside the vertical plate of the rotating member 412. The bottom wall of the support frame 431 slidably penetrates through the rotating member 412 up and down. Protrusions distributed up and down are fixed on one side of the vertical section of the inverted U-shaped pushing member 413 away from the fixed clamping member 414. A positioning hole penetrating up and down is provided on the protrusion. A locking block 432 fixedly connected to the support frame 431 penetrates through part of the rotating member 412 and is connected with the positioning hole in an up-and-down clamping manner.

[0045] When the inner support ring 11 is sleeved on the outer wall of the first pipe, multiple fixing clamps 414 on the lower side are distributed outside the first pipe. The rotating member 412 on the lower side rotates on the docking ring 411 to drive the inverted U-shaped pusher 413 to rotate. When the inclined surface of the inverted U-shaped pusher 413 gradually approaches and closely adheres to the inclined surface of the fixing clamp 414, the inverted U-shaped pusher 413 pushes the fixing clamp 414 towards the first pipe. Multiple fixing clamps 414 perform concentric calibration on the first pipe from multiple directions and stably clamp it.

[0046] The initial positions of multiple supporting plates 21 are in a state where their upper ends are far away from each other. The arc-shaped guiding grooves on the supporting plates 21 guide the to-be-installed pipe being hoisted towards the middle of the inner support ring 11.

[0047] When the to-be-installed pipe is placed downward between multiple fixing clamps 414 on the upper side, the rotating member 412 on the upper side rotates on the docking ring 411 to drive the inverted U-shaped pusher 413 to rotate. When the inclined surface of the inverted U-shaped pusher 413 gradually approaches and closely adheres to the inclined surface of the fixing clamp 414, the inverted U-shaped pusher 413 pushes the fixing clamp 414 towards the to-be-installed pipe. Multiple fixing clamps 414 perform concentric calibration on the to-be-installed pipe from multiple directions and stably clamp it.

[0048] When the to-be-installed pipe on the upper side gradually rotates into the first pipe on the lower side, the docking ring 411 on the upper side moves downward accordingly. The docking ring 411 drives the traction steel cable 23 to move downward. The traction steel cable 23 pulls the corresponding supporting plate 21 to change from the initial state where the upper ends are far away from each other to the state where the upper ends are close to each other (as Figure 5 shown). Multiple supporting plates 21 perform multi-directional supporting on the upper pipe, and the first ball 22 rolls and slides on the outer wall of the upper pipe.

[0049] Refer to Figure 4 and Figure 8 As shown in, the driving mechanism 5 includes a hydraulic rod 51. Multiple hydraulic rods 51 are symmetrically installed up and down inside the inner support ring 11. The output ends of the hydraulic rods 51 on the same side up and down are commonly fixedly connected to a ring plate 52 that is slidably connected up and down to the inner ring wall of the inner support ring 11. A plurality of ejector rods 53 are circumferentially fixedly connected to the outer wall of the side of the ring plate 52 close to the rotating member 412. The ejector rods 53 correspond to the fixing clamps 414. The end of the ejector rod 53 far away from the ring plate 52 is fixedly connected to a second wedge block corresponding to the first wedge block 424. Slots for the ring plate 52 and the ejector rods 53 to slide up and down are provided on the fixing clamp 414.

[0050] After the upper and lower pipes are docked, when the rotation of the upper fixed clamping member 414 stops, the ejector rod 53 is vertically aligned with the fixed clamping member 414. The output ends of the multiple hydraulic rods 51 extend simultaneously, driving the annular plate 52 and the ejector rod 53 to approach the upper and lower corresponding concentric mechanisms 4. The ejector rod 53 drives the second wedge block to move closer to the first wedge block 424, and gradually drives the sliding seat and the sliding clamping member 423 to move on the fixed clamping member 414 until the side wall of the sliding clamping member 423 closely adheres to the side walls of the upper and lower corresponding pipes (as Figure 8 shown).

[0051] Meanwhile, the annular plate 52 gradually moves closer to the locking assembly 43 in the rotating member 412. The support frame 431 is pushed, driving the locking block 432 to change from the state of being engaged with the inverted U-shaped pusher 413 to the state of being separated from the inverted U-shaped pusher 413 (as Figure 10 shown). The inverted U-shaped pusher 413 changes from the locked state to the state where it can slide on the rotating member 412. The electric slider drives the rotating ring 421 to rotate, and the rotating ring 421 drives the limiting plate group 422 and the inverted U-shaped pusher 413 to slide away from the fixed clamping member 414. The fixed clamping member 414 is no longer pushed, and the fixed clamping member 414 releases the clamping of the corresponding pipe fitting. The sliding clamping member 423 maintains the sliding clamping of the corresponding pipe fitting, so as to realize the change of the concentric mechanism 4 from relatively fixed clamping of the pipe to relatively sliding clamping state, facilitating the downward movement of the installed pipe and ensuring concentricity and perpendicularity during the movement.

[0052] The two ends of the geothermal well casing are usually divided into a female end and a male end. The female end is usually equipped with internal threads for mating connection with the casing with corresponding external threads (male end). The inner diameter at the female end, the outer diameter at the male end are the same as the outer diameter of the main pipe body, and the outer diameter at the female end is greater than the outer diameter of the main pipe body; by changing the extended distance of the output end of the hydraulic rod 51, the driving ejector rod 53 drives the second wedge block to push the first wedge block 424 to change the moving distance, so as to adjust the moving distance of the third ball of the sliding clamping member 423 to adapt to the change in the pipe diameter of the connecting end of the pipe fitting.

[0053] Referring to Figures 1 - 11 , the specific operation steps of the local geothermal well casing installation structure are as follows: First, place the first pipe into the well hole for positioning, then sleeve the inner support ring 11 onto the outer wall of the first pipe, and after concentric alignment through the lower fixed clamping member 414, clamp the pipe and fix the positions of the inner support ring 11, the middle support ring 12, and the outer support ring 13.

[0054] After the installation of the first pipe and the vertical mechanism 1 is completed, the pipe to be installed is lifted by a sling. The supporting mechanism 2 guides and supports the pipe to be installed. After the upper fixed clamping member 414 is concentrically aligned, the pipe is clamped. The pipe to be installed is rotated and installed by an external casing tong, so that the pipe to be installed gradually rotates into the first pipe at the lower side.

[0055] After the upper and lower pipes are completely connected, driven by the driving mechanism 5, the fixed clamping member 414 releases the clamping of the corresponding pipe fitting, and the sliding clamping member 423 retains the sliding clamping of the corresponding pipe fitting. The upper pipe is pushed downward by the sling to push the lower pipe. After the upper pipe gradually moves down to overlap with the initial position of the lower pipe, the driving mechanism 5 resets to drive the concentric mechanism 4 on the upper and lower sides to change back to the fixed clamping state, and the upper concentric mechanism 4 resets to the initial unclamped state. This process is repeated to facilitate the continuous connection of multiple pipes.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A geothermal well casing installation structure, comprising a vertical mechanism and a concentric mechanism, characterized in that, The vertical mechanism includes an inner support ring, and a middle support ring is sleeved outside the inner support ring. The inner support ring and the middle support ring are rotationally connected by two first rotating shafts symmetrically arranged front and back. An outer support ring is sleeved outside the middle support ring, and the middle support ring and the outer support ring are rotationally connected by two second rotating shafts symmetrically arranged left and right. A plurality of outer positioning members are assembled on the outer ring wall of the outer support ring along the circumferential direction, and an inner positioning member is assembled on the inner support ring; A supporting mechanism for centering and supporting the pipe fittings for upper-side feeding is arranged on the inner support ring. The middle part of the inner ring wall of the inner support ring is slidably connected up and down by a first spring with an up-and-down sliding seat. Driving mechanisms symmetrically distributed up and down and located below the up-and-down sliding seat are arranged on the inner ring wall of the inner support ring. Concentric mechanisms symmetrically distributed up and down are arranged on the inner ring wall of the inner support ring; The concentric mechanism includes a fixed clamping assembly arranged on the inner support ring for concentric alignment and fixed clamping of the butt joint ends of the pipe fittings. A sliding clamping assembly for maintaining concentric alignment during the downward movement of the lower pipe after the butt joint of the pipe fittings is completed is arranged on the fixed clamping assembly.

2. The installation structure of a geothermal well casing according to claim 1, characterized in that, The outer positioning member is composed of an electric push rod hinged to the outer ring wall of the outer support ring, a support hinged to the side of the electric push rod away from the outer support ring, and a first grounding nail connected to the support. The inner positioning member is composed of a plurality of second grounding nails circumferentially distributed and engaged with the inner support ring and a first ring member fixedly connected to the tops of the plurality of second grounding nails.

3. The installation structure of a geothermal well casing according to claim 1, characterized in that, The supporting mechanism includes a supporting plate. A plurality of supporting plates are hinged to the top wall of the inner support ring along the circumferential direction. Arc-shaped guide grooves facing up and down are formed on the sides of the plurality of supporting plates close to the central axis of the inner support ring. A plurality of first balls are rotatably connected to the tops of the arc-shaped guide grooves. Rectangular grooves facing up and down are formed in the middle of the arc-shaped guide grooves, and a traction steel cable installed on the supporting plate is arranged in the rectangular grooves.

4. The installation structure of a geothermal well casing according to claim 3, characterized in that The upper concentric mechanism is arranged above the up-and-down sliding seat, and the lower concentric mechanism is arranged below the lower driving mechanism. The fixed clamping assembly includes a docking ring. The upper docking ring is rotatably connected to the top wall of the up-and-down sliding seat, and the top wall of the upper docking ring is connected to the traction steel cable. A channel for connecting the traction steel cable and the docking ring is formed on the inner support ring. The lower docking ring is fixedly connected to the inner ring wall of the inner support ring. A rotating member is rotatably connected to the inside of the docking ring through an electric slider.

5. The installation structure of a geothermal well casing according to claim 4, characterized in that, The rotating member is composed of two second ring members distributed up and down and a plurality of vertical plates circumferentially fixed to the outer ring walls of the two second ring members. A plurality of inverted U-shaped pushing members slidably connected circumferentially through second springs are jointly arranged on the inner ring walls of the two second ring members along the circumferential direction. The two horizontal sections of the inverted U-shaped pushing members away from the rotating member are inclined. A plurality of fixed clamping members corresponding to the inverted U-shaped pushing members are slidably connected radially through third springs on the inner ring wall of the docking ring. The sides of the fixed clamping members close to the rotating member are inclined to be adapted to the inclined side walls of the inverted U-shaped pushing members. The sides of the fixed clamping members away from the rotating member are arc-shaped, and rubber pads are arranged on the arc-shaped surfaces to increase the friction force.

6. A geothermal well casing installation structure according to claim 5, characterized in that, The sliding clamping assembly includes a rotating ring. A rotating ring is rotatably connected between two second ring members through an electric slider. The inner ring wall of the rotating ring is circumferentially fixedly connected with a limiting plate group, and the limiting plate group includes two symmetrically distributed limiting plates, and the two limiting plates limit the middle vertical section of the inverted U-shaped pushing member.

7. A geothermal well casing installation structure according to claim 5, characterized in that, A sliding clamping member is slidably connected inside the fixed clamping member through a fourth spring. The sliding clamping member is composed of a sliding seat slidably connected to the inside of the fixed clamping member along the radial direction of the docking ring and a plurality of third balls rotatably connected to one side of the sliding seat away from the rotating member. A first wedge block is fixedly connected to one side of the sliding seat close to the rotating member.

8. A geothermal well casing installation structure according to claim 7, characterized in that, A locking assembly is arranged on the fixed clamping assembly. The locking assembly includes a support frame. The support frame is slid up and down inside the vertical plate of the rotating member through a fifth spring. Protrusions distributed up and down are fixed on the side of the vertical section of the inverted U-shaped pushing member away from the fixed clamping member. A positioning hole penetrating up and down is formed in the protrusion, and a locking block engaged with the positioning hole is fixedly connected to the support frame.

9. The installation structure of a geothermal well casing according to claim 8, characterized in that, The driving mechanism includes a hydraulic rod. A plurality of symmetrically arranged hydraulic rods are installed inside the inner support ring. The output ends of the hydraulic rods on the same side up and down are jointly fixedly connected to an annular plate slidably connected to the inner ring wall of the inner support ring.

10. A geothermal well casing installation structure according to claim 9, characterized in that, A plurality of ejector rods are circumferentially fixedly connected to the outer wall of the annular plate close to the rotating member, and the ejector rods correspond to the fixed clamping member. The end of the ejector rod away from the annular plate is fixedly connected to a second wedge block corresponding to the first wedge block, and a slot for the annular plate and the ejector rod to slide up and down is formed in the fixed clamping member.

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