A cementing equipment for geothermal well construction

Abstract

This invention provides a cementing device for geothermal well construction. The cementing device includes an external support structure installed inside the geothermal well; a casing structure installed inside the external casing structure; a grouting structure installed inside a sealing pipe; a sealing structure installed inside a groove; a positioning structure fixed to the side wall of a fixed outer casing; an adjusting structure installed inside the fixed outer casing; a driving structure installed inside the fixed outer casing; and magnets embedded in the bottom surface of the fixed outer casing and the surface of the driving clip. The cementing device for geothermal well construction provided by this invention effectively prevents slurry backflow through the casing during segmented cementing operations and supports the sidewalls inside the well during grouting, reducing the risk of collapse.

Description

Technical Field

[0001] This invention relates to the field of cementing equipment technology, and in particular to a cementing equipment for geothermal well construction. Background Technology

[0002] The purpose of cementing geothermal wells is primarily to seal cold water layers and complex formations, preventing cross-contamination between cold and hot water layers that could lead to a decrease in pumping temperature. Cementing geothermal wells can also prevent well accidents such as collapse of complex formations and narrowing of the well diameter.

[0003] Existing cementing equipment is prone to backflow of cement slurry through the casing during segmented cementing operations, causing blockage inside the casing. Furthermore, when unstable mud and sand on the well wall come into contact with the cement slurry during injection, they are prone to collapse and mix with the cement slurry, which seriously affects the quality of the cementing slurry.

[0004] Therefore, it is necessary to provide a new cementing equipment for geothermal well construction to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a cementing device for geothermal well construction that can effectively prevent slurry backflow through the casing during segmented cementing operations and can support the sidewalls inside the well during grouting, thereby reducing the phenomenon of collapse.

[0006] The present invention provides a cementing device for geothermal well construction, comprising: an external support structure installed inside the geothermal well, the external support structure including an outer pipe, a mounting frame, and a first piston; the outer pipe installed inside the geothermal well, the mounting frame installed on the top side wall of the outer pipe, and the first piston fixed to the bottom surface of the outer pipe; a casing structure installed inside the outer pipe structure, the casing structure including a sealing pipe, a water-stop umbrella, a sliding groove, and a through hole; the sealing pipe installed on the inner side wall of the outer pipe, the water-stop umbrella fixed to the bottom side wall of the sealing pipe, the through hole located on the side wall of the sealing pipe, and the sliding groove located on the inner side wall of the sealing pipe; and a grouting structure installed inside the sealing pipe. The grouting structure includes a grouting pipe, a fixed outer shell, a telescopic pipe, a second piston, a discharge pipe, and a first spring. The grouting pipe is installed inside the sealing pipe. The fixed outer shell is fixed to the bottom side wall of the grouting pipe. The telescopic pipe is fixed to both ends of the bottom side wall of the grouting pipe. The discharge pipe is installed at one end of the telescopic pipe. The first spring is installed inside one end of the discharge pipe. The second piston is fixed to the side wall of the discharge pipe. A sealing structure is installed inside the chute and includes a slider, a third piston, and a fixed rod. The slider slides inside the chute. The fixed rod is fixed at the center of the top surface of the slider. The third piston is fixed to both ends of the fixed rod. A linkage structure is also included. The structure is installed on the inner wall of the sealing tube. The linkage structure includes a threaded sleeve and an inclined surface. The threaded sleeve is installed on the inner wall of the sealing tube, and the inclined surface is located on the inner wall of both ends of the threaded sleeve. A positioning structure is fixed to the side wall of the fixed housing. The positioning structure includes a roller and a shock absorber. The shock absorber is fixed to the side wall of the fixed housing, and the roller is installed at one end of the shock absorber. An adjustment structure is installed inside the fixed housing. The adjustment structure includes a push rod, a threaded tube, and a first gear. The threaded tube is installed inside the fixed housing, the push rod is installed at both ends of the threaded tube, and the first gear is fixed to the side wall of the threaded tube. A drive structure is installed on the inner wall of the sealing tube. Inside the fixed housing, the driving structure includes a motor, a second gear, a third gear, a transmission rod, a driving clip, a fourth gear, a limiting block, a slot, and a locking block. The motor is installed inside the fixed housing. The second gear is fixed to one end of the motor. The transmission rod passes through the center of the bottom surface of the fixed housing. The third gear is fixed to the side wall of the transmission rod. The fourth gear is fixed to the top of the transmission rod. The driving clip is installed at the bottom end of the transmission rod. The limiting block is fixed to the side wall at the bottom end of the transmission rod. The slot is located in the center inside the driving clip. The locking block is fixed to the side wall at the bottom end of the driving clip. Magnets are embedded in the bottom surface of the fixed housing and the surface of the driving clip.

[0007] Preferably, the sealing structure further includes a collar, a support rod, a connector, a second spring, a fixing block, and a connecting block. The collar is installed at both ends of the fixing rod, the connector is fixed to the inner side wall of the third piston and the side wall of the collar, the support rod is rotatably connected to the connector, the fixing block is fixed at the center of the side wall of the fixing rod, the second spring is installed between the fixing block and the collar, and the connecting block is fixed to one end of the slider's side wall.

[0008] Preferably, the linkage structure further includes a first adjusting groove, a second adjusting groove, a third adjusting groove, and a limiting groove. The first adjusting groove is located at the center of both ends of the inner sidewall of the threaded sleeve, the second adjusting groove is located on the inner sidewall of the threaded sleeve, the third adjusting groove is located on the inner sidewall of the threaded sleeve, and the limiting groove is located on the sidewall of the threaded sleeve.

[0009] Preferably, the third piston slides inside the groove, and the collar is slidably connected to the fixed rod, and the third piston is extensible.

[0010] Preferably, the lengths of the first adjustment groove, the second adjustment groove, and the third adjustment groove are equal, and the bottom end of the first adjustment groove is connected to the second adjustment groove and the third adjustment groove, and the top opening of the first adjustment groove is open, and the bottom openings of the second adjustment groove and the third adjustment groove are open.

[0011] Preferably, the threaded sleeve is threadedly connected to the sealing tube, and the other end of the connecting block is slidably connected to the inside of the limiting groove provided on the side wall of the threaded sleeve.

[0012] Preferably, the first gear and the fourth gear mesh, the threaded tube is rotatably connected to the fixed housing, and the other end of the push rod is fixed to the bottom side wall of the discharge tube.

[0013] Preferably, the transmission rod is rotatably connected to the drive bar, the card block slides inside the card slot, the distance between the drive bar and the bottom surface of the fixed housing is small, and the magnets attract each other.

[0014] Preferably, the discharge pipe and the telescopic pipe are slidably connected, and the telescopic pipe slides on the side wall of the fixed housing, and the maximum diameter of the discharge pipe is equal to the maximum inner diameter of the through hole.

[0015] Compared with related technologies, the cementing equipment for geothermal well construction provided by this invention has the following beneficial effects:

[0016] This invention provides a cementing device for geothermal well construction. The device involves first installing a casing structure inside the geothermal well, sealing its bottom end against the well. Then, the sidewall of the casing structure is fitted into an external support structure, which supports the inner wall of the geothermal well, preventing internal collapse and debris loss. Next, a grouting structure is inserted from the top of the casing structure, with its bottom end supported by a positioning structure, maintaining it in a centered position within the casing structure. When the grouting structure descends to a certain position, a drive structure engages with a linkage structure. The drive structure then drives the linkage structure to rotate downwards within the casing structure, causing the sealing structure to slide downwards within the sidewall of the casing structure, disengaging it from the through-hole. The blockage is resolved by the discharge pipe at the bottom of the grouting structure engaging with the through hole under the drive of the adjusting structure. This allows the grout to be injected between the casing and the inner wall of the geothermal well. As more grout is injected, the pressure drives the external support structure to slide upwards, causing the grout to rise along the side wall of the casing structure, reducing the probability of the inner wall of the geothermal well collapsing. Because the storage pipe at the bottom of the grouting structure blocks the through hole, the grout will not flow into the casing through the through hole. After the grout injection is completed, the adjusting structure and the linkage structure are reset by the drive structure. At this time, the grouting structure and the sealing structure will also reset to ensure the backflow of grout. This equipment has the advantages of effectively preventing the backflow of grout through the casing during segmented cementing operations and supporting the inner wall of the well during grouting, reducing the possibility of collapse. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the cementing equipment for geothermal well construction provided by the present invention;

[0018] Figure 2 for Figure 1 The diagram shows the structural schematic of the grouting cross-section.

[0019] Figure 3 for Figure 1 The diagram shows a top view of the drive card bar's cross-section.

[0020] Figure 4 for Figure 1 The enlarged structural diagram of part A is shown below;

[0021] Figure 5 for Figure 1 A schematic diagram of the side cross-section of the threaded sleeve shown;

[0022] Figure 6 for Figure 2 The enlarged structural diagram of part B is shown below;

[0023] Figure 7 for Figure 2 The enlarged structural diagram of section C is shown.

[0024] Numbered in the diagram: 1. Geothermal well; 2. External support structure; 21. Outer pipe; 22. Mounting bracket; 23. First piston; 3. Casing structure; 31. Sealing pipe; 32. Water-stop umbrella; 33. Slide groove; 34. Through hole; 4. Grouting structure; 41. Grouting pipe; 42. Fixed outer shell; 43. Telescopic pipe; 44. Second piston; 45. Discharge pipe; 46. First spring; 5. Sealing structure; 51. Sliding block; 52. Third piston; 53. Fixing rod; 54. Collar; 45. Support rod; 56. Connector; 57. Second spring; 58. Fixing block. 59. Connecting block; 6. Linkage structure; 61. Threaded sleeve; 62. Inclined surface; 63. First adjustment groove; 64. Second adjustment groove; 65. Third adjustment groove; 66. Limiting groove; 7. Positioning structure; 71. Roller; 72. Shock absorber frame; 8. Adjustment structure; 81. Push rod; 82. Threaded tube; 83. First gear; 9. Drive structure; 91. Motor; 92. Second gear; 93. Third gear; 94. Transmission rod; 95. Drive clip; 96. Fourth gear; 97. Limiting block; 98. Slot; 99. Clip; 10. Magnet. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 ,in Figure 1 A schematic diagram of a preferred embodiment of the cementing equipment for geothermal well construction provided by the present invention; Figure 2 for Figure 1 The diagram shows the structural schematic of the grouting cross-section. Figure 3 for Figure 1 The diagram shows a top view of the drive card bar's cross-section. Figure 4 for Figure 1 The enlarged structural diagram of part A is shown below; Figure 5 for Figure 1 A schematic diagram of the side cross-section of the threaded sleeve shown; Figure 6 for Figure 2 The enlarged structural diagram of part B is shown below; Figure 7 for Figure 2The enlarged structural diagram of section C shows the cementing equipment for geothermal well construction, which includes: an external support structure 2, installed inside the geothermal well 1, comprising an outer pipe 21, a mounting bracket 22, and a first piston 23; a casing structure 3, installed inside the outer pipe 21, comprising a sealing pipe 31, a water-stop umbrella 32, a sliding groove 33, and a through hole 34; the sealing pipe 31 installed on the inner side wall of the outer pipe 21, and the water-stop umbrella 32 fixed to the bottom surface of the outer pipe 21; and a casing structure 3, installed inside the outer pipe 21, comprising a sealing pipe 31, a water-stop umbrella 32, a sliding groove 33, and a through hole 34. The sealing tube 31 is fixed to the bottom side wall, the through hole 34 is provided on the side wall of the sealing tube 31, and the sliding groove 33 is provided on the inner side wall of the sealing tube 31; the grouting structure 4 is installed inside the sealing tube 31, and the grouting structure 4 includes a grouting pipe 41, a fixed outer shell 42, a telescopic pipe 43, a second piston 44, a discharge pipe 45, and a first spring 46. The grouting pipe 41 is installed inside the sealing tube 31, the fixed outer shell 42 is fixed to the bottom side wall of the grouting pipe 41, the telescopic pipe 43 is fixed to both ends of the bottom side wall of the grouting pipe 41, the discharge pipe 45 is installed at one end of the telescopic pipe 43, and the first spring 46 is installed at... The second piston 44 is fixed to the side wall of the discharge pipe 45 and installed inside one end of the discharge pipe 45; the sealing structure 5 is installed inside the slide groove 33 and includes a slider 51, a third piston 52 and a fixing rod 53. The slider 51 slides inside the slide groove 33, the fixing rod 53 is fixed at the center of the top surface of the slider 51, and the third piston 52 is fixed at both ends of the fixing rod 53; the linkage structure 6 is installed on the inner side wall of the sealing pipe 31 and includes a threaded sleeve 61 and an inclined surface 62. The threaded sleeve 61 is installed on the inner side wall of the sealing pipe 31. Inclined surfaces 62 are provided on the inner sidewalls of both ends of the threaded sleeve 61; positioning structure 7 is fixed to the sidewall of the fixed housing 42, the positioning structure 7 includes rollers 71 and shock absorbers 72, the shock absorbers 72 is fixed to the sidewall of the fixed housing 42, and the rollers 71 are installed at one end of the shock absorbers 72; adjustment structure 8 is installed inside the fixed housing 42, the adjustment structure 8 includes push rods 81, threaded tubes 82 and first gears 83, the threaded tubes 82 are installed inside the fixed housing 42, the push rods 81 are installed at both ends of the threaded tubes 82, and the first gears 83 are fixed to the sidewalls of the threaded tubes 82;A drive structure 9 is installed inside the fixed housing 42. The drive structure 9 includes a motor 91, a second gear 92, a third gear 93, a transmission rod 94, a drive bar 95, a fourth gear 96, a limiting block 97, a slot 98, and a locking block 99. The motor 91 is installed inside the fixed housing 42. The second gear 92 is fixed to one end of the motor 91. The transmission rod 94 passes through the center of the bottom surface of the fixed housing 42. The third gear 93 is fixed to the side wall of the transmission rod 94. The fourth gear 96 is fixed to the top of the transmission rod 94. The drive bar 95 is installed at the bottom end of the transmission rod 94. The limiting block 97 is fixed to the side wall of the bottom end of the transmission rod 94. The slot 98 is located in the center inside the drive bar 95. The locking block 99 is fixed to the side wall of the bottom end of the drive bar 95. A magnet 10 is embedded in the bottom surface of the fixed housing 42 and the surface of the drive bar 95. ;

[0027] In the specific implementation process, such as Figure 1 and Figure 4 As shown, the sealing structure 5 further includes a collar 54, a support rod 45, a connector 56, a second spring 57, a fixing block 58, and a connecting block 59. The collar 54 is installed at both ends of the fixing rod 53. The connector 56 is fixed to the inner side wall of the third piston 52 and the side wall of the collar 54. The support rod 45 is rotatably connected to the connector 56. The fixing block 58 is fixed at the center of the side wall of the fixing rod 53. The second spring 57 is installed between the fixing block 58 and the collar 54. The connecting block 59 is fixed to one end of the side wall of the slider 51. In specific implementation, the third piston 52 slides inside the groove 33, and the collar 54 is slidably connected to the fixing rod 53. The third piston 52 is extensible.

[0028] To facilitate the sliding of the third piston 52 inside the slide groove 33, when the top of the third piston 52 abuts against the top of the slide groove 33, the second spring 57 will open the support rod 45, causing the support rod 45 to open the side wall of the third piston 52, thus blocking it into the through hole 34.

[0029] In the specific implementation process, such as Figure 1 and Figure 5As shown, the linkage structure 6 further includes a first adjusting groove 63, a second adjusting groove 64, a third adjusting groove 65, and a limiting groove 66. The first adjusting groove 63 is located at the center of both ends of the inner sidewall of the threaded sleeve 61, the second adjusting groove 64 is located on the inner sidewall of the threaded sleeve 61, the third adjusting groove 65 is located on the inner sidewall of the threaded sleeve 61, and the limiting groove 66 is located on the sidewall of the threaded sleeve 61. The lengths of the first adjusting groove 63, the second adjusting groove 64, and the third adjusting groove 65 are equal, and the bottom end of the first adjusting groove 63 communicates with the second adjusting groove 64 and the third adjusting groove 65. The top opening of the first adjusting groove 63 is open, and the bottom openings of the second adjusting groove 64 and the third adjusting groove 65 are open. The threaded sleeve 61 is threadedly connected to the sealing tube 31, and the other end of the connecting block 59 is slidably connected to the inside of the limiting groove 66 on the sidewall of the threaded sleeve 61.

[0030] The screw sleeve 61 can be rotated to drive the third piston 52 to slide inside the slide groove 33. At the same time, the first adjustment groove 63, the second adjustment groove 64 and the third adjustment groove 65 can cleverly drive the drive bar 95 to rotate the screw sleeve 61 or disengage from it.

[0031] In the specific implementation process, such as Figure 1 , Figure 2 and Figure 7 As shown, the first gear 83 and the fourth gear 96 mesh, and the threaded tube 82 is rotatably connected to the fixed housing 42, and the other end of the push rod 81 is fixed to the bottom side wall of the discharge tube 45; the discharge tube 45 is slidably connected to the telescopic tube 43, and the telescopic tube 43 slides on the side wall of the fixed housing 42, and the maximum diameter of the discharge tube 45 is equal to the maximum inner diameter of the through hole 34.

[0032] This allows the push rods 81 at both ends to retract or push outward when the threaded tube 82 rotates, so that the discharge tube 45 moves along with the push rods 81, enabling the storage tube to connect with the through hole 34 when the through hole 34 is opened, and allowing concrete to be poured out of the sealing tube 31.

[0033] In the specific implementation process, such as Figure 1 , Figure 2 , Figure 3 As shown, the transmission rod 94 is rotatably connected to the drive bar 95, and the block 99 slides inside the slot 98. The distance between the drive bar 95 and the bottom surface of the fixed housing 42 is small, and the magnets 10 attract each other.

[0034] When the transmission rod 94 rotates, the locking bar first rotates a certain distance inside the locking groove 98 and then engages with its side wall, so that it drives the driving locking bar 95 to rotate. In the stationary state, the magnets 10 attract each other and will reset the driving locking bar 95.

[0035] The working principle of the cementing equipment for geothermal well construction provided by this invention is as follows:

[0036] In use, first insert the sealing pipe 31 into the geothermal well 1, so that the water-stopping device is secured at the bottom end of the geothermal well 1. Then, install the outer pipe 21 on the side wall of the sealing pipe 31, so that the bottom end of the sealing pipe 31 and the outer pipe 21 are slidably connected, and the side wall of the outer pipe 21 abuts against the inner side wall of the geothermal well 1, so that it supports the inner side wall of the geothermal well 1 and prevents it from collapsing and falling debris. Then, insert the grouting pipe 41, which is fixed to one end of the fixed outer shell 42, from the top end of the sealing pipe 31, so that the shock-absorbing frame 72, which is fixed to the side wall of the fixed outer shell 42, abuts against the inner side wall of the sealing pipe 31 through the pulley, so that it can balance and support the position of the fixed outer shell 42. When the depth is reached, the concrete pouring is carried out. When positioning the device, first slide the roller 71 into the first adjusting groove 63 provided on the inner side wall of the threaded sleeve 61. At the same time, the drive clip 95 installed at the bottom end of the fixed housing 42 is also inside the first adjusting groove 63. Stop the descent of the fixed housing 42 when both ends of the drive clip 95 abut against the lowest end of the first adjusting groove 63. At this time, turn on the power of the motor 91, so that the motor 91 drives the second gear 92 to rotate clockwise. The second gear 92 drives the meshing third gear 93 to drive the transmission rod 94 to rotate counterclockwise. The transmission rod 94 drives the locking block 99 fixed on the bottom side wall to rotate counterclockwise. When it rotates to one end, it will abut against the locking block 99. The sidewall of groove 98 drives the drive bar 95 to slide into the interior of the third adjusting groove 65, causing the threaded sleeve 61 to rotate downward along the sidewall of the sealing tube 31. Simultaneously, the connecting block 59 slides through the limiting groove 66 against the threaded sleeve 61, causing the slider 51 to slide downward inside the sliding groove 33, deforming the third rubber pad and causing the support rod 45 to retract inward, stretching the second spring 57. When the drive bar 95 abuts against the top of the third bar, the through hole 34 disengages from the threaded sleeve 61, causing the third piston 52 blocking the through hole 34 to retract into the sliding groove 33, opening the through hole 34. At this time, the discharge pipe 4... 5. The transmission rod 94, which rotates simultaneously with the through hole 34 on the same horizontal line, also drives the fourth gear 96 fixed at the top to rotate, causing the first gear 83 to rotate instantaneously, causing the threaded tube 82 to rotate, driving the push rods 81 at both ends to extend outward, pushing the discharge pipe 45 outward until the discharge pipe 45 inserts into the interior of the through hole 34. The second piston 44, fixed to its side wall, seals the gap between them, allowing the mortar inside the grouting pipe 41 to be injected through the storage pipe into the space between the side wall of the sealing pipe 31 and the inner side wall of the geothermal well 1. As more concrete is injected, it will rise along the side wall of the sealing pipe 31. Due to the high pressure of the injected mortar,The mortar will push the outer pipe 21 upwards. Only when the mortar completely fills the gap between the sealing pipe 31 and the geothermal well 1 will the outer pipe 21 rise with the mortar, thus supporting the inner wall of the geothermal well 1. Simultaneously, the second piston 44 seals the gap between the through hole 34 and the storage pipe to ensure the backflow of the mortar. After the mortar injection is complete, simply reverse the motor 91 to cause its drive bar 95 to reset the threaded sleeve 61 and the discharge pipe 45. The three pistons 52 will re-block the through hole 34, preventing grout from flowing into the sealing pipe 31. Then, the grouting pipe 41 can continue to move downwards. At this point, the drive clip 95 will disengage from the pad adjustment groove, and the magnet 10 will reset the drive clip 95, allowing it to pass smoothly. This device effectively prevents grout backflow through the casing during segmented cementing operations and supports the well wall during grouting, reducing the risk of collapse.

[0037] Compared with related technologies, the cementing equipment for geothermal well construction provided by this invention has the following beneficial effects:

[0038] This invention provides a cementing device for geothermal well construction. First, the casing structure 3 is installed inside the geothermal well 1, with its bottom end engaging and sealing against the well. Then, the sidewall of the casing structure 3 is fitted into the external support structure 2, which supports the inner sidewall of the geothermal well 1, preventing internal collapse and debris loss. Next, the grouting structure 4 is inserted from the top of the casing structure 3, with its bottom end supported by the positioning structure 7, maintaining it in a centered position inside the casing structure 3. When the grouting structure 4 descends to a certain position, the driving structure 9 engages with the linkage structure 6. At this time, the driving structure 9 drives the linkage structure 6 to rotate downwards within the casing structure 3, causing the sealing structure 5 to slide downwards within the sidewall of the casing structure 3, thus releasing the sealing structure 5 from blocking the through hole 34. The discharge pipe 45 at the bottom of the grouting structure 4 will engage with the through hole 34 under the drive of the adjusting structure 8, allowing the grout to be injected between the casing and the inner wall of the geothermal well 1 through the grouting structure 4. As more grout is injected, the pressure will drive the outer support structure 2 to slide upward, causing the grout to rise along the side wall of the casing structure 3, thus reducing the probability of the inner wall of the geothermal well 1 collapsing. Since the storage pipe at the bottom of the grouting structure 4 blocks the through hole 34, the grout will not flow into the interior of the casing through the through hole 34. After the grout injection is completed, the adjusting structure 8 and the linkage structure 6 will be reset by the drive structure 9. At this time, the grouting structure 4 and the sealing structure 5 will also be reset to ensure the backflow of grout. This equipment has the advantages of effectively preventing the backflow of grout through the casing during segmented cementing operations and supporting the side wall inside the well during grouting, reducing the phenomenon of collapse.

[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A cementing apparatus for geothermal well construction, characterized by, include: An external support structure (2) is installed inside the geothermal well (1). The external support structure (2) includes an outer pipe (21), a mounting bracket (22), and a first piston (23). The outer pipe (21) is installed inside the geothermal well (1), the mounting bracket (22) is installed on the top side wall of the outer pipe (21), and the first piston (23) is fixed to the bottom surface of the outer pipe (21). The sleeve structure (3) is installed inside the outer tube (21) structure. The sleeve structure (3) includes a sealing tube (31), a water-stop umbrella (32), a sliding groove (33) and a through hole (34). The sealing tube (31) is installed on the inner side wall of the outer tube (21). The water-stop umbrella (32) is fixed to the bottom side wall of the sealing tube (31). The through hole (34) is provided on the side wall of the sealing tube (31). The sliding groove (33) is provided on the inner side wall of the sealing tube (31). Grouting structure (4), the grouting structure (4) is installed inside the sealing pipe (31), the grouting structure (4) includes grouting pipe (41), fixed shell (42), telescopic pipe (43), second piston (44), discharge pipe (45) and first spring (46), the grouting pipe (41) is installed inside the sealing pipe (31), the fixed shell (42) is fixed to the bottom side wall of the grouting pipe (41), the telescopic pipe (43) is fixed to both ends of the bottom side wall of the grouting pipe (41), the discharge pipe (45) is installed at one end of the telescopic pipe (43), the first spring (46) is installed inside one end of the discharge pipe (45), and the second piston (44) is fixed to the side wall of the discharge pipe (45); A sealing structure (5) is installed inside the slide groove (33), and the sealing structure (5) includes a slider (51), a third piston (52) and a fixing rod (53). The slider (51) slides inside the slide groove (33), the fixing rod (53) is fixed at the center of the top surface of the slider (51), and the third piston (52) is fixed at both ends of the fixing rod (53). Linkage structure (6), the linkage structure (6) is installed on the inner wall of the sealing tube (31), the linkage structure (6) includes a threaded sleeve (61) and an inclined surface (62), the threaded sleeve (61) is installed on the inner wall of the sealing tube (31), and the inclined surface (62) is provided on the inner walls at both ends of the threaded sleeve (61); Positioning structure (7), the positioning structure (7) is fixed to the side wall of the fixed housing (42), the positioning structure (7) includes a roller (71) and a shock absorber (72), the shock absorber (72) is fixed to the side wall of the fixed housing (42), and the roller (71) is installed at one end of the shock absorber (72); An adjustment structure (8) is installed inside the fixed housing (42). The adjustment structure (8) includes a push rod (81), a threaded tube (82), and a first gear (83). The threaded tube (82) is installed inside the fixed housing (42). The push rod (81) is installed at both ends of the threaded tube (82). The first gear (83) is fixed to the side wall of the threaded tube (82). A drive structure (9) is installed inside the fixed housing (42). The drive structure (9) includes a motor (91), a second gear (92), a third gear (93), a transmission rod (94), a drive bar (95), a fourth gear (96), a limiting block (97), a slot (98), and a locking block (99). The motor (91) is installed inside the fixed housing (42), and the second gear (92) is fixed to one end of the motor (91). The transmission rod (94) The third gear (93) is fixed to the side wall of the transmission rod (94) at the center of the bottom surface of the fixed housing (42), the fourth gear (96) is fixed to the top of the transmission rod (94), the drive bar (95) is installed at the bottom end of the transmission rod (94), the limiting block (97) is fixed to the side wall of the bottom end of the transmission rod (94), the slot (98) is located at the center inside the drive bar (95), and the block (99) is fixed to the side wall of the bottom end of the transmission rod (94). Magnets (10) are respectively embedded in the bottom surface of the fixed housing (42) and the surface of the drive strip (95).

2. The cementing equipment for geothermal well construction according to claim 1, characterized in that, The sealing structure (5) further includes a collar (54), a support rod (55), a connector (56), a second spring (57), a fixing block (58), and a connecting block (59). The collar (54) is installed at both ends of the fixing rod (53). The connector (56) is fixed to the inner side wall of the third piston (52) and the side wall of the collar (54). The support rod (55) is rotatably connected to the connector (56). The fixing block (58) is fixed at the center of the side wall of the fixing rod (53). The second spring (57) is installed between the fixing block (58) and the collar (54). The connecting block (59) is fixed to one side wall of the slider (51).

3. The cementing equipment for geothermal well construction according to claim 2, characterized in that, The linkage structure (6) further includes a first adjustment groove (63), a second adjustment groove (64), a third adjustment groove (65), and a limiting groove (66). The first adjustment groove (63) is located at the center of both ends of the inner sidewall of the threaded sleeve (61), the second adjustment groove (64) is located on the inner sidewall of the threaded sleeve (61), the third adjustment groove (65) is located on the inner sidewall of the threaded sleeve (61), and the limiting groove (66) is located on the sidewall of the threaded sleeve (61).

4. The cementing equipment for geothermal well construction according to claim 2, characterized in that, The third piston (52) slides inside the groove (33), and the collar (54) is slidably connected to the fixed rod (53), and the third piston (52) is extensible.

5. The cementing equipment for geothermal well construction according to claim 3, characterized in that, The lengths of the first adjustment groove (63), the second adjustment groove (64) and the third adjustment groove (65) are equal, and the bottom end of the first adjustment groove (63) is connected to the second adjustment groove (64) and the third adjustment groove (65). The top opening of the first adjustment groove (63) is open, and the bottom openings of the second adjustment groove (64) and the third adjustment groove (65) are open.

6. The cementing equipment for geothermal well construction according to claim 3, characterized in that, The threaded sleeve (61) is threadedly connected to the sealing tube (31), and the other end of the connecting block (59) is slidably connected to the inside of the limiting groove (66) provided on the side wall of the threaded sleeve (61).

7. The cementing equipment for geothermal well construction according to claim 1, characterized in that, The first gear (83) and the fourth gear (96) mesh, and the threaded tube (82) is rotatably connected to the fixed housing (42), and the other end of the push rod (81) is fixed to the bottom side wall of the discharge pipe (45).

8. The cementing equipment for geothermal well construction according to claim 1, characterized in that, The transmission rod (94) is rotatably connected to the drive bar (95), and the card block (99) slides inside the card slot (98). The distance between the drive bar (95) and the bottom surface of the fixed housing (42) is small, and the magnets (10) attract each other.

9. The cementing equipment for geothermal well construction according to claim 1, characterized in that, The discharge pipe (45) is slidably connected to the telescopic pipe (43), and the telescopic pipe (43) slides on the side wall of the fixed housing (42), and the maximum diameter of the discharge pipe (45) is equal to the maximum inner diameter of the through hole (34).

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