Large-diameter well drilling inner sleeve butt joint structure

Abstract

The utility model belongs to the technical field of large-diameter well drilling inner sleeves, and particularly relates to a large-diameter well drilling inner sleeve butt joint structure which comprises an upper sleeve and a lower sleeve, a servo motor is fixedly installed on the inner wall of the upper sleeve through an installation base, and a first gear is fixedly connected to the outer side of an output shaft of the servo motor in a sleeved mode. A mounting plate is fixedly connected to the inner wall of the upper sleeve, a rotating shaft is mounted in the mounting plate through a bearing, and a threaded rod is fixedly connected to the lower end of the rotating shaft. The upper sleeve and the lower sleeve are pushed to be clamped with each other, the threaded rod can be driven to rotate under the action of the servo motor, the second gear, the rotating shaft and other structures, then the butt-joint rod is pushed to move, the butt-joint rod is deeply inserted into the butt-joint cylinder, and locking of the butt-joint rod and the butt-joint cylinder is completed under the action of friction clamping teeth on the surface of the butt-joint rod. And then the upper sleeve and the lower sleeve are subjected to butt joint locking treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of large-diameter drilling inner casings, and specifically relates to a butt-joint structure for large-diameter drilling inner casings. Background Art

[0002] As is well known, a large-diameter drilling inner casing is a pipeline device used for large-diameter drilling. Its main functions are to provide wellbore support and prevent wellbore collapse. At the same time, it can also be used to control the pressure in the well and protect the formation.

[0003] Its main functions include the following: controlling the pressure in the well: during the drilling process, the large-diameter drilling inner casing can be used to control the pressure in the well and prevent problems such as bottom hole outburst; preventing wellbore collapse: by placing the casing inside the drilling wellbore, a stable structure is formed to prevent the wellbore from collapsing due to unstable formation; protecting the formation: the large-diameter drilling inner casing can play a role in protecting the formation during the drilling process, preventing drilling fluid from penetrating into sensitive formations or polluting groundwater resources, etc.

[0004] In the invention patent with the authorization announcement number CN113445937A, a butt-joint construction method for large-diameter drilling inner casings is disclosed. Step 1: Lower the upper casing from the wellhead of the drilling into the drilling, place the lower casing in the roadway below the drilling, and it is located directly below the drilling; Step 2: Manually connect the lifting device to the connecting female part, lower the drill pipe from the wellhead of the drilling through the upper casing into the roadway, and manually connect the lower end of the drill pipe to the lifting device; Step 3: Lift the drill pipe upward to lift the lifting device and the lower casing into the drilling until the second tapered thread at the upper end of the lower casing extends into the first tapered thread at the lower end of the upper casing, and rotate the drill pipe to drive the lifting device and the lower casing to rotate so that the second tapered thread at the upper end of the lower casing is threadedly connected to the first tapered thread at the lower end of the upper casing; Step 4: Continue to rotate the drill pipe so that the lifting device twists the connecting female part off the lower casing, and continue to lift the drill pipe to lift the lifting device and the connecting female part out of the drilling. Its butt-joint efficiency is high.

[0005] However, there are also certain deficiencies in the existing butt-joint structures of large-diameter drilling inner casings. First of all, most of the existing butt-joint structures of large-diameter drilling inner casings adopt a manual adjustment method to butt-joint the docking parts inside the upper casing and the lower casing, which is obviously inconvenient for operators to use.

[0006] Secondly, most of the casings used in the existing butt-joint structures of large-diameter drilling inner casings are of straight-through design, which will cause the problem of rapid backflow of subsequent underground fluids and it is difficult to stably control the use of the fluids. Content of the Utility Model

[0007] The purpose of the present utility model is to provide a butt-joint structure for the inner casing of a large-diameter drilling, which solves the problem that the existing butt-joint structures for the inner casing of large-diameter drillings mostly use manual adjustment methods to butt-joint the upper casing and the lower casing, making it inconvenient for operators to use; and it also solves the problem that the casings used in the existing butt-joint structures for the inner casing of large-diameter drillings are mostly straight-through designs, which will cause rapid backflow of subsequent underground fluids and make it difficult to stably control the fluids.

[0008] To achieve the above object, the present utility model provides the following technical solution: A butt-joint structure for the inner casing of a large-diameter drilling, including an upper casing and a lower casing. A servo motor is fixedly installed on the inner wall of the upper casing through a mounting seat. A first gear is fixedly sleeved on the outer side of the output shaft of the servo motor. An installation plate is fixedly connected to the inner wall of the upper casing. A rotating shaft is installed inside the installation plate through a bearing. A threaded rod is fixedly connected to the lower end of the rotating shaft. A butt-joint rod is threadedly connected to the outer side of the threaded rod. A chute is formed on the surface of the butt-joint rod. A guide plate is fixedly connected to the inner wall of the upper casing. The guide plate is slidably connected to the chute.

[0009] A flow-through disk is fixedly connected to the inner wall of the lower casing. A butt-joint cylinder is fixedly connected to the middle of the upper end of the flow-through disk. A fixed disk is fixedly connected to the inner wall of the lower casing below the flow-through disk. A telescopic rod is slidably connected inside the fixed disk. A magnetic disk is fixedly connected to the upper end of the telescopic rod. The magnetic disk is in contact with the flow-through disk. An annular electromagnet is fixedly installed on the upper end of the fixed disk. The annular electromagnet is slidably connected to the telescopic rod. A terminal disk is fixedly connected to the lower end of the telescopic rod. A spring is arranged on the outer side of the telescopic rod.

[0010] Preferably, a second gear is fixedly sleeved on the outer side of the rotating shaft. The second gear meshes with the first gear. Through the meshing relationship, when the second gear rotates, it can drive the first gear to rotate.

[0011] Preferably, friction teeth are arranged on the surface of the butt-joint rod. There are multiple friction teeth, and the multiple friction teeth are evenly distributed on the butt-joint rod. Through the arrangement of the friction teeth on the surface of the butt-joint rod, it can be used for subsequent butt-joint clamping.

[0012] Preferably, there are two chutes, and the two chutes are symmetrically distributed on the butt-joint rod. Through the arrangement of the chutes, it is convenient to cooperate with the guide plate for guiding.

[0013] Preferably, friction slots are formed on the inner wall of the butt-joint cylinder. There are multiple friction slots, and the multiple friction slots are evenly distributed on the butt-joint cylinder. Through the arrangement of the friction slots, it can ensure normal butt-joint fixation in the subsequent process.

[0014] Preferably, a plug is fixedly connected to the upper end of the magnetic disk, and the plug is slidably connected to the flow-through disk. Through the arrangement of the plug, the flow-through disk can be blocked.

[0015] Preferably, four annular electromagnets are provided, and the four annular electromagnets are arranged in a circular array on the fixed disk. Through the arrangement of the annular electromagnets, the magnetic disk can be magnetically attracted.

[0016] Preferably, one end of the spring is welded to the end disk, and the other end of the spring is welded to the fixed disk. Through the arrangement of the spring, the end disk can be connected and used.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. By pushing the upper sleeve and the lower sleeve to engage with each other, under the action of structures such as the servo motor, gear two, and rotating shaft, the threaded rod can be driven to rotate, and then the docking rod can be pushed to move, so that the docking rod deeply inserts into the docking cylinder. Under the action of the friction teeth on the surface of the docking rod, the locking of the docking rod and the docking cylinder is completed, and then the docking and locking of the upper sleeve and the lower sleeve are carried out.

[0019] 2. Through the magnetic attraction of the annular electromagnet, the magnetic disk can be pulled to move, so as to drive the telescopic rod to move, the spring deforms, and then the plug is driven to disengage from the flow-through disk, so that the flow-through disk is in a flowing state, and the opening and closing control of the flow-through disk is carried out to avoid the problem of fluid backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional view of the overall structure of the present utility model;

[0021] Figure 2 is the Figure 1 sectional three-dimensional view of the present utility model;

[0022] Figure 3 is the Figure 2 enlarged view of the docking rod of the present utility model;

[0023] Figure 4 is the Figure 2 enlarged view of the flow-through disk of the present utility model.

[0024] In the figure: 1. Upper sleeve; 2. Lower sleeve; 3. Servo motor; 4. Gear one; 5. Mounting plate; 6. Rotating shaft; 7. Gear two; 8. Threaded rod; 9. Docking rod; 10. Chute; 11. Guide plate; 12. Flow-through disk; 121. Docking cylinder; 13. Fixed disk; 14. Telescopic rod; 15. Magnetic disk; 16. Plug; 17. Annular electromagnet; 18. End disk; 19. Spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0026] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 A butt-joint structure for an inner casing of a large-diameter drilling rig, comprising an upper casing 1 and a lower casing 2. A servo motor 3 is fixedly installed on the inner wall of the upper casing 1 through a mounting seat. A first gear 4 is fixedly sleeved on the outer side of the output shaft of the servo motor 3. An installation plate 5 is fixedly connected to the inner wall of the upper casing 1. A rotating shaft 6 is installed in the interior of the installation plate 5 through a bearing. A threaded rod 8 is fixedly connected to the lower end of the rotating shaft 6. A butt-joint rod 9 is threadedly connected to the outer side of the threaded rod 8. A sliding groove 10 is formed on the surface of the butt-joint rod 9. A guide plate 11 is fixedly connected to the inner wall of the upper casing 1. The guide plate 11 is slidably connected to the sliding groove 10.

[0027] A circulation plate 12 is fixedly connected to the inner wall of the lower casing 2. A butt-joint cylinder 121 is fixedly connected to the middle of the upper end of the circulation plate 12. A fixed plate 13 is fixedly connected to the inner wall of the lower casing 2 below the circulation plate 12. A telescopic rod 14 is slidably connected to the interior of the fixed plate 13. A magnetic disk 15 is fixedly connected to the upper end of the telescopic rod 14. The magnetic disk 15 is in contact with the circulation plate 12. An annular electromagnet 17 is fixedly installed on the upper end of the fixed plate 13. The annular electromagnet 17 is slidably connected to the telescopic rod 14. A terminal plate 18 is fixedly connected to the lower end of the telescopic rod 14. A spring 19 is arranged on the outer side of the telescopic rod 14.

[0028] Please refer to Figure 1 、 Figure 2 、 Figure 3 A second gear 7 is fixedly sleeved on the outer side of the rotating shaft 6. The second gear 7 meshes with the first gear 4. Due to the meshing relationship, when the second gear 7 rotates, the first gear 4 can be driven to rotate. Friction teeth are arranged on the surface of the butt-joint rod 9. There are multiple friction teeth, and the multiple friction teeth are evenly distributed on the butt-joint rod 9. Through the arrangement of the friction teeth on the surface of the butt-joint rod 9, it can be used for subsequent butt-joint and engagement. There are two sliding grooves 10, and the two sliding grooves 10 are symmetrically distributed on the butt-joint rod 9. Through the arrangement of the sliding grooves 10, it is convenient to cooperate with the guide plate 11 for guiding.

[0029] Please refer to Figure 1 、 Figure 2 、 Figure 4, the inner wall of the docking cylinder 121 is provided with friction card slots. There are multiple friction card slots, and the multiple friction card slots are evenly distributed on the docking cylinder 121. Through the setting of the friction card slots, the subsequent normal docking and fixing can be ensured. The upper end of the magnetic disk 15 is fixedly connected with a plug 16, and the plug 16 is slidably connected with the circulation disk 12. Through the setting of the plug 16, the circulation disk 12 can be blocked. There are four annular electromagnets 17, and the four annular electromagnets 17 are arranged in a circular array on the fixed disk 13. Through the setting of the annular electromagnets 17, the magnetic disk 15 can be magnetically attracted. One end of the spring 19 is welded to the end disk 18, and the other end of the spring 19 is welded to the fixed disk 13. Through the setting of the spring 19, the end disk 18 can be connected and used.

[0030] The specific implementation process of the present utility model is as follows: When the large-diameter drilling inner casing docking structure needs to be used, by pushing the upper casing 1 into contact with the lower casing 2, the upper casing 1 and the lower casing 2 are mutually engaged. The servo motor 3 is started to drive the output shaft to rotate, so as to drive the first gear 4 to rotate. In the meshing relationship, the first gear 4 drives the second gear 7 to rotate, and finally the rotating shaft 6 rotates. When the rotating shaft 6 rotates, it can drive the threaded rod 8 to rotate. In the threaded connection relationship, the docking rod 9 can be pushed downward, so that the guide plate 11 slides along the inner wall of the chute 10 to ensure the stable movement of the docking rod 9. Finally, the docking rod 9 is deeply inserted into the docking cylinder 121. Under the combined use of the friction teeth and the friction card slots, the upper casing 1 and the lower casing 2 are docked and locked.

[0031] The annular electromagnet 17 is started to magnetically attract the magnetic disk 15, so as to pull the telescopic rod 14 downward, and then drive the plug 16 to move. When the telescopic rod 14 moves, it can drive the end disk 18 to move, and the spring 19 deforms. When the magnetic disk 15 contacts the annular electromagnet 17, the spring 19 no longer deforms, and the plug 16 disengages from the circulation hole formed on the surface of the circulation disk 12, so that the circulation disk 12 is in a circulation state, automatically controlling the opening and closing of the circulation state of the large-diameter drilling inner casing, and avoiding the problem of subsequent fluid backflow.

[0032] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A large-diameter well casing butt joint structure, comprising an upper casing (1) and a lower casing (2), characterized in that: A servo motor (3) is fixedly mounted on the inner wall of the upper sleeve (1) via a mounting seat, a gear 1 (4) is fixedly sleeved on the outer side of the output shaft of the servo motor (3), a mounting plate (5) is fixedly connected to the inner wall of the upper sleeve (1), a rotating shaft (6) is mounted inside the mounting plate (5) via a bearing, a threaded rod (8) is fixedly connected to the lower end of the rotating shaft (6), a docking rod (9) is threadedly connected to the outer side of the threaded rod (8), a sliding groove (10) is provided on the surface of the docking rod (9), a guide plate (11) is fixedly connected to the inner wall of the upper sleeve (1), and the guide plate (11) is slidably connected to the sliding groove (10); The inner wall of the lower sleeve (2) is fixedly connected to a circulation disk (12), and the middle part of the upper end of the circulation disk (12) is fixedly connected to a docking sleeve (121). The inner wall of the lower sleeve (2) is located below the circulation disk (12) and is fixedly connected to a fixed disk (13). A telescopic rod (14) is slidably connected inside the fixed disk (13). The upper end of the telescopic rod (14) is fixedly connected to a magnetic disk (15), and the magnetic disk (15) is in contact with the circulation disk (12). An annular electromagnet (17) is fixedly installed on the upper end of the fixed disk (13), and the annular electromagnet (17) is slidably connected to the telescopic rod (14). The lower end of the telescopic rod (14) is fixedly connected to an end disk (18), and a spring (19) is arranged on the outer side of the telescopic rod (14).

2. A large-diameter drilling inner casing butt joint structure according to claim 1, characterized in that: A second gear (7) is fixedly sleeved on the outer side of the rotating shaft (6), and the second gear (7) is meshed with the first gear (4).

3. A large-diameter well casing butt joint structure according to claim 1, characterized in that: The surface of the docking rod (9) is provided with friction teeth, and a plurality of the friction teeth are provided, and the plurality of the friction teeth are evenly distributed on the docking rod (9).

4. The large-diameter well casing butt joint structure according to claim 1, characterized in that: Two slide grooves (10) are provided, and the two slide grooves (10) are symmetrically distributed on the docking rod (9).

5. The large-diameter well casing butt joint structure according to claim 1, characterized in that: The inner wall of the docking sleeve (121) is provided with a friction groove, and a plurality of the friction grooves are provided, and the plurality of friction grooves are evenly distributed on the docking sleeve (121).

6. The large-diameter well casing butt joint structure according to claim 1, characterized in that: A plug (16) is fixedly connected to the upper end of the magnetic disk (15), and the plug (16) is slidably connected to the circulation disk (12).

7. The large-diameter well casing butt joint structure according to claim 1, characterized in that: Four annular electromagnets (17) are provided, and the four annular electromagnets (17) are arranged in an annular array on the fixed disk (13).

8. The large-diameter drilling inner casing docking structure according to claim 1, characterized in that: One end of the spring (19) is welded to the end plate (18), and the other end of the spring (19) is welded to the fixed plate (13).

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