A geothermal well casing installation structure

Abstract

The present invention discloses a geothermal well casing installation structure, which relates to the technical field of drilling accessories installation, including a vertical mechanism and a concentric mechanism. The inner support ring is provided with a supporting mechanism for centering and supporting the pipe fittings fed from the upper side, and the middle part of the inner ring wall of the inner support ring is connected to an upper and lower sliding seat by a spring that slides up and down. The inner ring wall of the inner support ring is provided with a driving mechanism located below the upper and lower sliding seats and symmetrically distributed up and down. The inner ring wall of the inner support ring is provided with a concentric mechanism symmetrically distributed up and down. The present invention can adapt to the situation where the nearby ground is uneven, avoid the uneven ground causing the guiding direction to be non-vertical, and improve the flexibility of use of the device; the arc-shaped guide groove on the supporting plate guides the hoisted pipe to be installed to the middle part of the inner support ring, and multiple supporting plates support the upper pipe in multiple directions, thereby improving the stability during the movement process; and ensure the concentricity and verticality of the installed pipe during the downward movement.

Description

Technical Field

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

[0002] Geothermal well casing is an important drilling accessory used in the geothermal well drilling process. It is mainly used to protect the well wall and ensure the safety and stability of the drilling process. The installation steps of geothermal well casing are usually: lowering the first guide tube, assembling the casing string, lowering the casing string, etc.

[0003] During the current installation of geothermal well casing, before starting to install the main casing, a section of guide pipe is usually lowered into the well to guide the subsequent casing into position correctly. A guide device is set at the wellhead position, and then multiple sections of casing are sequentially connected into a complete casing string through casing clamps. Finally, a drilling rig or special lowering equipment is used to slowly lower the assembled casing string to the predetermined depth. However, if the ground at the wellhead position is uneven, the position of the guide ring or guide frame will not be accurate enough, and the angle of the casing to be guided into the well will be offset, and the verticality of the casing cannot be guaranteed, which will lead to the failure of the verticality of the casing. It affects the connection accuracy between the casings; secondly, the existing common lifting methods include drilling rig winch lifting or hydraulic jacking device lifting. The drilling rig winch lifting has high flexibility, but the accuracy and stability during lowering need to be improved. The hydraulic jacking device lifting equipment has high accuracy during lowering, but the cost is relatively high, the setting and debugging time is long, and the flexibility is not high; thirdly, the instability of the installed pipeline during the downward movement will cause the pipeline to bend, which will cause the next section of the pipeline to be misaligned when docking. 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 of the entire installation process, the present invention provides a geothermal well casing installation structure. Summary of the Invention

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

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a geothermal well casing installation structure, including a vertical mechanism and a concentric mechanism, the vertical mechanism includes an inner support ring, and the outer sleeve of the inner support ring is provided with a middle support ring, the inner support ring and the middle support ring are rotatably connected by two rotating shafts symmetrically arranged in the front and back, the outer sleeve of the middle support ring is provided with an outer support ring, and the middle support ring and the outer support ring are rotatably connected by two rotating shafts symmetrically arranged in the left and right, the outer ring wall of the outer support ring is equipped with multiple external positioning parts along the circumferential direction, and the inner support ring is equipped with an internal positioning part.

[0007] The inner support ring is provided with a supporting mechanism for centering and supporting the pipe fittings fed from the upper side, and the middle part of the inner ring wall of the inner support ring is connected to the upper and lower sliding seats through a spring for sliding up and down. The inner ring wall of the inner support ring is provided with a driving mechanism located below the upper and lower sliding seats and symmetrically distributed up and down. The inner ring wall of the inner support ring is provided with a concentric mechanism symmetrically distributed up and down.

[0008] The concentric mechanism includes a fixed clamping assembly arranged on the inner support ring for concentrically aligning and fixing the butted ends of the pipes, and a sliding clamping assembly is provided on the fixed clamping assembly for maintaining concentric alignment when the lower pipe is moved after the pipes are butted.

[0009] In the above-mentioned geothermal well casing installation structure, the external positioning part is composed of an electric push rod hinged to the outer ring wall of the outer support ring, a support hinged on the side of the electric push rod away from the outer support ring, and a grounding nail connected to the support. The internal positioning part is composed of a plurality of grounding nails 2 distributed circumferentially and engaged with the inner support ring and a circular ring part 1 fixedly connected to the top of a plurality of grounding nails 2.

[0010] In the above-mentioned geothermal well casing installation structure, the supporting mechanism includes a supporting plate, and the top wall of the inner support ring is hinged with multiple supporting plates along the circumferential direction. The multiple supporting plates are provided with an upward and downward arc-shaped guide groove on one side close to the central axis of the inner support ring, and the top of the arc-shaped guide groove is rotatably connected with multiple ball bearings. The middle of the arc-shaped guide groove is provided with an upward and downward rectangular groove, and a traction steel cable installed on the support plate is arranged in the rectangular groove.

[0011] In the above-mentioned geothermal well casing installation structure, the upper concentric mechanism is arranged above the upper and lower sliding seats, 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 upper and lower sliding seats, 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 opened on the inner support ring, the lower docking ring is fixedly connected to the inner ring wall of the inner support ring, and the interior of the docking ring is rotatably connected to a rotating part through an electric slider.

[0012] In the above-mentioned geothermal well casing installation structure, the rotating part is composed of two circular ring parts 2 distributed up and down and multiple vertical plates fixed circumferentially on the outer ring walls of the two circular ring parts 2. The inner ring walls of the two circular ring parts 2 are jointly circumferentially distributed with multiple inverted U-shaped pushers connected by spring 2 in a circumferential sliding manner, and the two horizontal sections of the inverted U-shaped pushers are inclined away from the rotating part. The inner ring wall of the docking ring is radially slidably connected with multiple fixed clamping parts corresponding to the inverted U-shaped pushers through spring 3. The side of the fixed clamping part close to the rotating part is inclined to match the inclined side wall of the inverted U-shaped pusher, and the side of the fixed clamping part away from the rotating part is arc-shaped, and a rubber pad can be provided on the arc-shaped surface to increase friction.

[0013] In the above-mentioned geothermal well casing installation structure, the sliding clamping assembly includes a rotating ring, and the two circular ring members are rotatably connected to the rotating ring through an electric slider, and the inner ring wall of the rotating ring is circumferentially fixedly connected to 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.

[0014] In the above-mentioned geothermal well casing installation structure, the interior of the fixed clamp is slidably connected to the sliding clamp via a spring four, and the sliding clamp is composed of a sliding seat radially slidably connected to the interior of the fixed clamp along the docking ring and a plurality of balls three rotatably connected to the side of the sliding seat away from the rotating member, and a wedge block one is fixedly connected to the side of the sliding seat close to the rotating member.

[0015] In the above-mentioned geothermal well casing installation structure, a locking assembly is provided on the fixed clamping assembly, the locking assembly includes a support frame, and the vertical plate of the rotating part is connected to the support frame by sliding up and down through spring five, and the vertical section of the inverted U-shaped pushing member is fixed with upper and lower distributed protrusions on the side away from the fixed clamping member, and the protrusions are provided with multiple positioning holes running through the upper and lower parts, and the support frame is fixedly connected with a locking block that penetrates part of the rotating part and is engaged with the positioning holes.

[0016] In the above-mentioned geothermal well casing installation structure, the driving mechanism includes a hydraulic rod, and multiple hydraulic rods are installed symmetrically in the upper and lower directions inside the inner support ring. The output ends of the hydraulic rods on the same side of the upper and lower sides are fixedly connected to an annular plate that is slidably connected to the inner ring wall of the inner support ring.

[0017] In the above-mentioned geothermal well casing installation structure, a plurality of push rods are fixedly connected to the outer wall of the annular plate on one side close to the rotating part, and the push rods correspond to the fixed clamping part. The end of the push rod away from the annular plate is fixedly connected to the wedge block 2 corresponding to the wedge block 1, and the fixed clamping part is provided with a groove for the annular plate and the push rods to slide up and down.

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

[0019] 2. Through the cooperation of the supporting mechanism and the concentric mechanism, before the upper and lower pipes are connected, the arc-shaped guide groove on the supporting plate guides the hoisted pipe to be installed to the middle of the inner support ring; when the upper and lower pipes are connected, the docking ring drives the traction cable to move downward, and the traction cable pulls the corresponding supporting plate from the initial upper end away state to the upper end close state. Multiple supporting plates provide multi-directional support for the upper pipe, thereby improving the stability of the upper pipe during the downward movement.

[0020] 3. Through the cooperation of the driving mechanism and the concentric mechanism, during the docking process of the two pipe fittings, multiple fixed clamps calibrate the pipes concentrically from multiple directions and clamp them stably. After the two pipe fittings are docked, the driving mechanism drives the concentric mechanism to change the pipe from a relatively fixed clamping state to a relatively sliding clamping state to ensure the concentricity and verticality of the installed pipe during the downward movement; at the same time, the driving mechanism adjusts the movement of the ball bearings of the sliding clamp so that it always keeps close to the corresponding upper and lower pipe side walls to adapt to the change in pipe diameter of the connecting end of the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 A schematic diagram of the overall structure.

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

[0024] Figure 3 Schematic diagram of the vertical structure from a top view.

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

[0026] Figure 5 Schematic diagram of the changes in the traction cable before and after being subjected to force.

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

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

[0029] Figure 8 Schematic diagram of the changes before and after the sliding clamp and the push rod are connected.

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

[0031] Figure 10 Schematic diagram of the changes before and after the support frame and the annular plate move.

[0032] Figure 11 This is a structural diagram of two pipe fittings before they are connected.

[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. Support mechanism; 21. Support plate; 22. Ball bearing 1; 23. Traction cable; 3. Upper and lower sliding seats; 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. Wedge block 1; 43. Locking assembly; 431. Support frame; 432. Locking block; 5. Driving mechanism; 51. Hydraulic rod; 52. Annular plate; 53. Push rod. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Reference Figures 1 to 4 The outer ring wall of the outer support ring 13 is equipped with a plurality of outer positioning members 15 along the circumferential direction, and the inner support ring 13 is equipped with an inner positioning member 14; 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 grounding nail connected to the support; the inner positioning member 14 is composed of a plurality of grounding nails two distributed in the circumferential direction and engaged with the inner support ring 11 and a circular ring member one fixedly connected to the top of the plurality of grounding nails two.

[0036] Reference Figure 1 and Figure 4The inner support ring 11 is provided with a supporting mechanism 2 for centering and supporting the pipe fittings fed from the upper side. The middle part of the inner ring wall of the inner support ring 11 is connected to the upper and lower sliding seats 3 for sliding up and down through a spring 1 (not shown in the figure). The inner ring wall of the inner support ring 11 is provided with a driving mechanism 5 located below the upper and lower sliding seats 3 and symmetrically distributed up and down. The inner ring wall of the inner support ring 11 is provided with a concentric mechanism 4 symmetrically distributed up and down.

[0037] First, put the first pipe into the wellbore for positioning, then sleeve the inner support ring 11 onto 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 inner support ring 11 and the first pipe are connected, insert the inner positioning piece 14 into the inner support ring 11 from top to bottom, connect the grounding nail 2 to the ground, and lock the position of the inner support ring 11 with the ground. The outer support ring 13 is affected by the gravity of the earth and rotates adaptively on the outside of the middle support ring 12 through the shaft 2. The middle support ring 12 is affected by the gravity of the earth. The outer side of the inner support ring 11 is adaptively rotated by the rotating shaft 1, and the electric push rod is extended to an appropriate height to push the support to a ground position near the first pipe. The support is connected to the ground through a grounding nail 1 to fix the positions of the inner support ring 11 and the outer support ring 13. The outer support ring 13 provides support for the inner support ring 11, ensuring the verticality of the subsequent pipeline connection, and can adapt to the uneven ground near the first pipe, avoiding the uneven ground causing the guide direction to be non-vertical, and quickly completing concentric and vertical calibration, thereby improving the flexibility of use of this equipment.

[0038] After the installation of the first pipe and the vertical mechanism 1 is completed, the pipe to be installed is lifted by the sling, and is placed downward on the concentric mechanism 4 on the upper side of the inner support ring 11 under the guidance of the supporting mechanism 2. The concentric mechanism 4 on the upper side clamps the pipe after concentric alignment, and is clamped by an external casing clamp (the casing clamp is an existing equipment and will not be described in detail here) and then rotated for installation. The pipe to be installed on the upper side gradually rotates into the first pipe on the lower side, and the concentric mechanism 4 on the upper side is driven to rotate on the upper and lower sliding seats 3. The upper and lower sliding seats 3 gradually move downward on the inner ring wall of the inner support ring 11 as the two pipes are threadedly connected. The upper and lower sliding seats 3 drive 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 upper concentric mechanism 4 to change the upper pipe from a relatively fixed clamping state to a relatively sliding clamping state. At the same time, the driving mechanism 5 drives the lower concentric mechanism 4 to change the lower pipe from a relatively fixed clamping state to a relatively sliding clamping state. The upper pipe is pushed downward by the sling. After the upper pipe gradually moves down to overlap with the initial position of the lower pipe, the driving mechanism 5 is reset to drive the upper and lower concentric mechanisms 4 to change to a fixed clamping state again. The upper concentric mechanism 4 is reset to the initial unclamped state. This reciprocating process facilitates the continuous connection of multiple pipes.

[0040] Reference Figure 1 and Figure 5 The supporting mechanism 2 includes a supporting plate 21. The top wall of the inner support ring 11 is hinged with multiple supporting plates 21 along the circumferential direction. The multiple supporting plates 21 are each provided with an upward and downward arc-shaped guide groove on one side close to the central axis of the inner support ring 11. The top of the arc-shaped guide groove is rotatably connected with multiple ball bearings 22. The middle of the arc-shaped guide groove is provided with an upward and downward rectangular groove, and a traction steel cable 23 installed on the supporting plate 21 is arranged in the rectangular groove.

[0041] Reference Figure 4 and Figure 6 The concentric mechanism 4 includes a fixed clamping assembly 41 arranged on the inner support ring 11 for concentrically aligning and fixing the butt joint ends of the pipe fittings. The fixed clamping assembly 41 is provided with a sliding clamping assembly 42 for maintaining concentric alignment when the lower pipe is moved after the pipe fittings are butt jointed.

[0042] Reference Figure 4 、 Figure 6 and Figure 7The upper concentric mechanism 4 is arranged above the upper and lower sliding seats 3, and the lower concentric mechanism 4 is arranged below the lower driving mechanism 5. The fixed clamping assembly 41 includes a docking ring 411. The upper docking ring 411 is rotatably connected to the top wall of the upper and lower sliding seats 3. The top wall of the upper docking ring 411 is connected to the traction cable 23. A channel for connecting the traction cable 23 and the docking ring 411 is opened on the inner support ring 11. The lower docking ring 411 is fixedly connected to the inner ring wall of the inner support ring 11. The interior of the docking ring 411 is rotatably connected to a rotating member 412 through an electric slider; the rotating member 412 is composed of two circular ring members 2 distributed above and below and a plurality of circumferentially fixed outer ring walls of the two circular ring members 2. The inner ring wall of the two circular ring members 411 is composed of a plurality of inverted U-shaped pushers 413 distributed along the circumferential direction, which are circumferentially connected by spring 2 (not shown in the figure). The two horizontal sections of the inverted U-shaped pushers 413 are inclined away from the side of the rotating member 412. The inner ring wall of the docking ring 411 is radially slidably connected with a plurality of fixed clamping members 414 corresponding to the inverted U-shaped pushers 413 through spring 3 (not shown in the figure). The side of the fixed clamping member 414 close to the rotating member 412 is inclined to match the inclined side wall of the inverted U-shaped pusher 413. The side of the fixed clamping member 414 away from the rotating member 412 is arc-shaped, and a rubber pad can be provided on the arc-shaped surface to increase friction.

[0043] Reference Figure 6 、 Figure 8 and Figure 9 The sliding clamping assembly 42 includes a rotating ring 421, and the two circular ring members 2 are rotatably connected to the rotating ring 421 through an electric slider. The inner ring wall of the rotating ring 421 is circumferentially fixedly connected to the limit plate group 422. The limit plate group 422 includes two symmetrically distributed limit plates, and the two limit plates limit the middle vertical section of the inverted U-shaped pushing member 413; the interior of the fixed clamping member 414 is slidably connected to the sliding clamping member 423 through a spring four (not shown in the figure). The sliding clamping member 423 consists of a sliding seat that is radially slidably connected to the interior of the fixed clamping member 414 along the docking ring 411 and a plurality of balls three that are rotatably connected to the side of the sliding seat away from the rotating member 412. A wedge block 424 is fixedly connected to the side of the sliding seat close to the rotating member 412.

[0044] Reference Figure 6 、 Figures 9 and 10 A locking assembly 43 is provided on the fixed clamping assembly 41, and the locking assembly 43 includes a support frame 431. The vertical plate of the rotating member 412 is connected to the support frame 431 by sliding up and down through a spring five (not shown in the figure). The bottom wall of the support frame 431 slides up and down through the rotating member 412. The vertical section of the inverted U-shaped pushing member 413 is fixed with upper and lower distributed protrusions on the side away from the fixed clamping member 414. The protrusions are provided with positioning holes that pass through the upper and lower parts. The support frame 431 is fixedly connected to a locking block 432 that passes through part of the rotating member 412 and is engaged with the positioning holes up and down.

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

[0046] The initial positions of the plurality of support plates 21 are in a state where the upper ends are away from each other, and the arc-shaped guide grooves on the support plates 21 guide the hoisted pipes to be installed toward the middle of the inner support ring 11 .

[0047] When the pipe to be installed is placed downward between the multiple fixed clamps 414 on the upper side, the upper rotating member 412 rotates on the docking ring 411, driving the inverted U-shaped pushing member 413 to rotate. When the inverted U-shaped pushing member 413 rotates until the inclined surface gradually approaches and is close to the inclined surface of the fixed clamp 414, the inverted U-shaped pushing member 413 pushes the fixed clamp 414 closer to the pipe to be installed. The multiple fixed clamps 414 perform concentric calibration on the pipe to be installed from multiple directions and clamp it stably.

[0048] When the upper pipe to be installed gradually rotates and enters the first pipe on the lower side, the upper docking ring 411 moves downward, and the docking ring 411 drives the traction cable 23 to move downward, and the traction cable 23 pulls the corresponding supporting plate 21 from the initial state of the upper ends being away from each other to the state of the upper ends being close to each other (such as Figure 5 As shown), multiple support plates 21 provide multi-directional support for the upper pipe, and ball 1 22 rolls and slides on the outer wall of the upper pipe.

[0049] Reference Figure 4 and Figure 8 The driving mechanism 5 includes a hydraulic rod 51. A plurality of hydraulic rods 51 are installed symmetrically in the upper and lower parts of the inner support ring 11. The output ends of the hydraulic rods 51 on the same side are fixedly connected to an annular plate 52 that is slidably connected to the inner ring wall of the inner support ring 11. A plurality of push rods 53 are circumferentially fixedly connected to the outer wall of the annular plate 52 close to the rotating part 412. The push rods 53 correspond to the fixed clamping part 414. The end of the push rod 53 away from the annular plate 52 is fixedly connected to a wedge block 2 corresponding to the wedge block 1 424. The fixed clamping part 414 is provided with a slot for the annular plate 52 and the push rod 53 to slide up and down.

[0050] After the upper and lower pipes are butt-jointed, when the upper fixed clamping member 414 stops rotating, the push rod 53 is aligned with the fixed clamping member 414, and the output ends of the multiple hydraulic rods 51 are extended at the same time, driving the annular plate 52 and the push rod 53 to approach the upper and lower corresponding concentric mechanisms 4, and the push rod 53 drives the wedge block 2 to move close to the wedge block 1 424, and gradually drives the slide and the sliding clamping member 423 to move on the fixed clamping member 414 until the side wall of the sliding clamping member 423 is in close contact with the upper and lower corresponding pipe side walls (such as Figure 8 shown).

[0051] At the same time, the annular plate 52 gradually moves closer to the locking assembly 43 in the rotating member 412, and the support frame 431 is pushed, driving the locking block 432 to change from the state of being engaged with the inverted U-shaped pushing member 413 to the state of being separated from the inverted U-shaped pushing member 413 (as shown in FIG. Figure 10 As shown in the figure, the inverted U-shaped pusher 413 changes from a locked state to a state that can slide on the rotating member 412, and the electric slider drives the rotating ring 421 to rotate. 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, and the sliding clamping member 423 maintains the sliding clamping of the corresponding pipe fitting, so that the concentric mechanism 4 changes the pipe from a relatively fixed clamping state to a relatively sliding clamping state, which facilitates the downward movement of the installed pipe and ensures concentricity and verticality during the movement.

[0052] The two ends of the geothermal well casing are usually divided into a female end and a female end. The female end is usually equipped with an internal thread for matching and connecting with a casing with a corresponding external thread (female end). The inner diameter at the female end and the outer diameter at the female end are the same as the outer diameter of the main body, and the outer diameter at the female end is larger than the outer diameter of the main body. The distance extended by the output end of the hydraulic rod 51 changes, and the driving rod 53 drives the wedge block 2 to push the wedge block 1 424 to change the moving distance, so as to adjust the moving distance of the ball 3 of the sliding clamp 423 to adapt to the change in the pipe diameter of the connecting end of the pipe fitting.

[0053] Reference Figures 1-11 The specific operating steps of the local hot well casing installation structure are as follows: first, place the first pipe into the wellbore for positioning, then sleeve the inner support ring 11 onto the outer wall of the first pipe, clamp the pipe after concentric alignment through the lower fixing clamp 414, and fix the positions of the inner support ring 11, middle support ring 12 and 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 the sling, and the supporting mechanism 2 guides and supports the pipe to be installed. The fixed clamp 414 on the upper side clamps the pipe after concentric alignment, and the pipe to be installed is rotated and installed by the external casing clamp, so that the pipe to be installed gradually rotates into the first pipe on the lower side.

[0055] After the upper and lower pipes are completely connected, the driving mechanism 5 drives the fixed clamping member 414 to release the clamping of the corresponding pipe fitting, and the sliding clamping member 423 retains the sliding clamping of the corresponding pipe fitting, and the upper pipe is pushed downward by the sling. After the upper pipe gradually moves down to overlap with the initial position of the lower pipe, the driving mechanism 5 is reset to drive the upper and lower concentric mechanisms 4 to change to a fixed clamping state, and the upper concentric mechanism 4 is reset to the initial unclamped state, so that multiple pipes can be connected continuously.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection 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 provided on the outer surface of the inner support ring. The inner support ring and the middle support ring are rotatably connected by two rotating shafts 1 arranged symmetrically in front and back. The outer surface of the middle support ring is provided with an outer support ring, and the middle support ring and the outer support ring are rotatably connected by two rotating shafts 2 arranged symmetrically in left and right. The outer ring wall of the outer support ring is equipped with multiple external positioning members along the circumferential direction, and the inner support ring is equipped with an internal positioning member. The inner support ring is provided with a supporting mechanism for centering and supporting the pipe fittings fed from the upper side, and the middle part of the inner ring wall of the inner support ring is connected to the upper and lower sliding seats by a spring, and the inner ring wall of the inner support ring is provided with a driving mechanism located below the upper and lower sliding seats and symmetrically distributed up and down, and the inner ring wall of the inner support ring is provided with a concentric mechanism symmetrically distributed up and down; The concentric mechanism includes a fixed clamping assembly provided on the inner support ring for concentrically aligning and fixing the butted ends of the pipes, and a sliding clamping assembly provided on the fixed clamping assembly for maintaining the concentric alignment when the lower pipe is moved after the butt joint of the pipes is completed; The supporting mechanism includes a supporting plate, and a plurality of supporting plates are hingedly connected to the top wall of the inner supporting ring along the circumferential direction. The plurality of supporting plates are each provided with an arc-shaped guide groove facing upward and downward on one side close to the central axis of the inner supporting ring, and a plurality of ball bearings are rotatably connected to the top of the arc-shaped guide groove. A rectangular groove facing upward and downward is provided in the middle of the arc-shaped guide groove, and a traction steel cable installed on the supporting plate is provided in the rectangular groove. The concentric mechanism on the upper side is arranged above the upper and lower sliding seats, and the concentric mechanism on the lower side 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 upper and lower sliding seats, 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 opened on the inner support ring. The lower docking ring is fixedly connected to the inner ring wall of the inner support ring. The interior of the docking ring is rotatably connected to a rotating member through an electric slider. The rotating part is composed of two circular ring parts 2 distributed up and down and a plurality of vertical plates fixed circumferentially on the outer ring walls of the two circular ring parts 2. The inner ring walls of the two circular ring parts 2 are jointly circumferentially distributed with a plurality of inverted U-shaped pushing parts connected by spring 2 in a circumferential sliding manner, and the two horizontal sections of the inverted U-shaped pushing parts are inclined away from the side of the rotating part. The inner ring wall of the docking ring is radially slidably connected with a plurality of fixed clamping parts corresponding to the inverted U-shaped pushing parts through spring 3. The side of the fixed clamping part close to the rotating part is inclined to match the inclined side wall of the inverted U-shaped pushing part, and the side of the fixed clamping part away from the rotating part is arc-shaped, and a rubber pad is provided on the arc-shaped surface to increase friction.

2. A geothermal well casing installation structure according to claim 1, characterized in that: The external positioning part is composed of an electric push rod hinged to the outer ring wall of the outer support ring, a support hinged on the side of the electric push rod away from the outer support ring, and a grounding pin connected to the support. The internal positioning part is composed of a plurality of grounding pins 2 distributed circumferentially and engaged with the inner support ring, and a circular ring part 1 fixedly connected to the top of a plurality of grounding pins 2.

3. The geothermal well casing installation structure according to claim 1, characterized in that: The sliding clamping assembly includes a rotating ring, and the two circular ring members are rotatably connected to the rotating ring through an electric slider, and the inner ring wall of the rotating ring is circumferentially fixedly connected to a limit plate group, and the limit plate group includes two symmetrically distributed limit plates, and the two limit plates limit the middle vertical section of the inverted U-shaped pushing member.

4. The geothermal well casing installation structure according to claim 1, characterized in that: The interior of the fixed clamp is slidably connected to a sliding clamp via a spring four, and the sliding clamp is composed of a slide seat radially slidably connected to the interior of the fixed clamp along the docking ring and a plurality of balls three rotatably connected to the side of the slide seat away from the rotating member, and a wedge block one is fixedly connected to the side of the slide seat close to the rotating member.

5. A geothermal well casing installation structure according to claim 4, characterized in that: The fixed clamping assembly is provided with a locking assembly, which includes a support frame, and the vertical plate of the rotating member is connected to the support frame by sliding up and down through spring five. The vertical section of the inverted U-shaped pushing member is fixed with upper and lower distributed protrusions on the side away from the fixed clamping member, and the protrusions are provided with positioning holes that pass through the upper and lower parts, and the support frame is fixedly connected with a locking block that is engaged with the positioning hole.

6. A geothermal well casing installation structure according to claim 5, characterized in that: The driving mechanism includes a hydraulic rod, and multiple hydraulic rods are installed symmetrically in the inner support ring. The output ends of the hydraulic rods on the same side are fixedly connected to an annular plate that is slidably connected to the inner ring wall of the inner support ring.

7. A geothermal well casing installation structure according to claim 6, characterized in that: The outer wall of the annular plate close to the rotating part is circumferentially fixedly connected with a plurality of push rods, and the push rods correspond to the fixed clamping part. The end of the push rod away from the annular plate is fixedly connected with a wedge block 2 corresponding to the wedge block 1, and the fixed clamping part is provided with a slot for the annular plate and the push rods to slide up and down.

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