Telescopic underground connecting device

Abstract

The invention discloses a telescopic underground connecting device, and relates to the technical field of petroleum drilling engineering, the telescopic underground connecting device comprises an outer cylinder, a telescopic rod and a connecting part, the telescopic rod is fixedly connected with the connecting part, a cable is installed in the outer cylinder, the telescopic rod and the connecting part, and a spiral area is arranged on the cable; an inner cylinder is arranged in the outer cylinder, and the telescopic rod is in sliding fit with the inner cylinder; a scraping mechanism is arranged at one end of the outer cylinder, a supporting mechanism is arranged in the telescopic rod and used for limiting a spiral area on a cable to the center area of the telescopic rod, the supporting mechanism comprises a supporting cylinder arranged in the telescopic rod, and limiting rods are arranged on the supporting cylinder in an array telescopic mode; a winding mechanism is further arranged in the telescopic rod and used for winding and tensioning the cable. Telescopic adjustment can be carried out according to actual requirements, adaptive supporting adjustment can be carried out on internal cables, frequent collision is avoided, the influence caused by external vibration is reduced, and stable transmission of signals is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling engineering, and particularly relates to a telescopic downhole connection device. Background Art

[0002] Downhole connection devices are usually used in oil drilling engineering, especially during the installation, operation, or maintenance of downhole equipment, providing flexible connection and disconnection capabilities. It can simplify the operation of equipment during deep well operations and enable efficient connection in an environment with limited downhole space. Currently, the connection device is used to connect equipment components inside drill collars or drill pipes. According to the actual situation of drilling operations, the lengths of drill collars or drill pipes are generally customized according to the actual needs of drilling operations, and their lengths vary. In addition, after long-term use, drill collars or drill pipes need to be repaired, and their lengths will also change. However, the connection device is generally rigidly connected to the drill collar or drill pipe and cannot be telescopically adjusted adaptively. Therefore, it is necessary to synchronously adjust the connection device, resulting in a reduction in the drilling operation efficiency. There are also cables installed inside the connection device that need to be telescopically adjusted adaptively. However, during drilling operations, due to external vibration, the cables will collide frequently inside the device, which will affect signal transmission. Based on this, the present invention proposes a connection device that can be telescopically adjusted according to actual needs and can adaptively support and adjust the internal cables to avoid frequent collisions and reduce the impact of external vibration, ensuring stable signal transmission. Summary of the Invention

[0003] Aiming at the above technical problems, the present invention can be telescopically adjusted according to actual needs, and can adaptively support and adjust the internal cables to avoid frequent collisions, reduce the impact of external vibration, and ensure stable signal transmission.

[0004] The implementation solution of the present invention is as follows: A telescopic downhole connection device includes an outer cylinder, a telescopic rod, and a connection part. The telescopic rod is fixedly connected to the connection part. Cables are installed inside the outer cylinder, the telescopic rod, and the connection part, and a spiral area is provided on the cables. An inner cylinder is arranged inside the outer cylinder, and the telescopic rod is slidably matched with the inner cylinder. Locking mechanisms are respectively arranged at the ends of the connection part and the outer cylinder for locking the cables. A scraping mechanism is arranged at one end of the outer cylinder. The scraping mechanism includes a scraping part rotatably installed on the end face of the outer cylinder. A support mechanism is arranged inside the telescopic rod for limiting the spiral area on the cable to the central area of the telescopic rod so that the spiral area does not contact the inner wall of the telescopic rod. The support mechanism includes a support cylinder arranged inside the telescopic rod, and limiting rods are arranged on the support cylinder in an array and can be telescopically adjusted. A winding mechanism is also arranged inside the telescopic rod for winding and tensioning the cables.

[0005] Further, a plurality of limiting disks are arranged in the inner cylinder in an array. A hole is formed in the inner side of the limiting disk, and limiting balls are arranged on the inner wall of the hole for limiting the cable.

[0006] Further, the locking mechanism includes a threaded cylinder arranged at the connecting part and the end of the outer cylinder. A push cylinder is connected to the outer side of the threaded cylinder by a thread. The locking mechanism further includes a pressing ring arranged to axially expand and contract, and a clamping part arranged to radially expand and contract. An extrusion part is arranged on the inner side of the pressing ring for pushing the clamping part. On the end of the connecting part, a first spring is connected between the pressing ring and the connecting part, and a second spring is connected between the clamping part and the connecting part. On the end of the outer cylinder, a first spring is connected between the pressing ring and the outer cylinder, and a second spring is connected between the clamping part and the outer cylinder. The pressing ring is pushed by the top of the push cylinder.

[0007] Further, a first motor, a lead screw and a guide rod are arranged inside the outer cylinder. The first motor is used to drive the lead screw. One end of the telescopic rod facing the outer cylinder is provided with a sliding seat. The sliding seat is slidably matched with the inner cylinder. The sliding seat is movably arranged on the lead screw and the guide rod, and the sliding seat and the lead screw form a screw pair. The sliding seat moves to drive the scraping mechanism.

[0008] Further, the scraping mechanism includes a mounting cylinder rotatably arranged at one end inside the outer cylinder. A torsion spring is arranged inside the mounting cylinder. One end of the torsion spring is connected to the sliding seat. A first gear is arranged at one end of the mounting cylinder. The rotating shaft of the first gear is connected to the center of the torsion spring. A rotating shaft is rotatably mounted at the end of the outer cylinder. A second gear and a third gear are respectively arranged at both ends of the rotating shaft. The second gear meshes with the first gear. A toothed disk is connected to the scraping part. The toothed disk meshes with the third gear. A sealing disk is further arranged on the end face of the outer cylinder. A gap is reserved between the sealing disk and the end face of the outer cylinder. The toothed disk is rotatably arranged in the gap, and the third gear is located in the gap.

[0009] Further, the support mechanism includes a transmission box arranged inside the support cylinder. An oil pipe is communicated with the transmission box for transmitting lubricating oil. A pushing electric cylinder is arranged inside the support cylinder. A push rod is arranged on the telescopic rod of the pushing electric cylinder. A push wheel is arranged on the push rod. Spray holes are formed in the limiting rod, and a telescopic pipe is arranged on the limiting rod. The telescopic pipe is slidably connected with the support cylinder. The telescopic pipe is communicated with the oil pipe, and a fourth spring is sleeved on the telescopic pipe. A contact part is arranged at the end of the telescopic pipe and is pushed by the push wheel.

[0010] Further, the winding mechanism includes a winding motor and a winding drum arranged inside the telescopic rod. The winding drum is driven by the winding motor. A rubber column is arranged inside the winding drum, and a support rod is telescopically arranged on the circumference of the winding drum. A third spring is connected between the support rod and the winding drum.

[0011] The beneficial effects of the present invention compared with the prior art are as follows: (1) The present invention can be adaptively adjusted according to the lengths of the drill pipe and the drill collar. Specifically, by operating the first motor, the lead screw rotates, causing the sliding seat and the telescopic rod to move, thereby achieving length adjustment; (2) The spiral area on the cable is supported and limited by the limiting rod, which limits it to the central area of the telescopic rod, avoiding direct contact with the inner wall of the telescopic rod. When there is an external vibration, the spiral area of the cable will not collide with the inner wall of the telescopic rod. That is, on the premise of being able to adaptively expand and contract, the cable can be prevented from frequently colliding with the inner wall of the telescopic rod, reducing the vibration of the cable, which is beneficial to improving the communication signal; (3) The transmission box can transmit lubricating oil, which is released through the spray holes on the limiting rod, that is, sprayed on the cable, reducing friction and being beneficial to protecting the cable; (4) The straight area of the cable is in the telescopic rod and is wound by a reel. That is, the reel is driven by a winding motor, and the cable can be retracted and released in both directions. When the cable contracts, the reel adaptively winds the cable to keep the straight area of the cable in a tensioned state, preventing it from coming into contact and colliding with the inner wall of the telescopic rod under the influence of external vibration; (5) When adjusting the expansion and contraction, the sliding seat drives the coil spring to move, then the first gear rotates. Under the gear transmission, the toothed disc rotates, and the scraping part rotates to remove impurities on the telescopic rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 It is a schematic sectional view of the overall structure of the present invention.

[0014] Figure 3 It is a schematic diagram of the installation structure of the inner cylinder of the present invention.

[0015] Figure 4 It is a schematic diagram of the structure of the locking mechanism of the present invention.

[0016] Figure 5 It is a schematic diagram of the partial installation structure of the locking mechanism of the present invention.

[0017] Figure 6 It is a schematic diagram of the installation structure of the sliding seat of the present invention.

[0018] Figure 7 It is a schematic diagram of the installation structure of the scraping mechanism of the present invention.

[0019] Figure 8 It is a schematic diagram of the installation structure of the cable of the present invention.

[0020] Figure 9 It is a schematic diagram of the installation structure of the winding mechanism of the present invention.

[0021] Figure 10 It is a schematic diagram of the internal installation structure of the reel of the present invention.

[0022] Figure 11 Schematic diagram of the installation structure of the support mechanism of the present invention.

[0023] Figure 12 Schematic diagram of the internal installation structure of the support cylinder of the present invention.

[0024] Figure 13 Schematic diagram of the installation structure of the support mechanism of the present invention from another angle.

[0025] Reference numerals: 1 - outer cylinder; 2 - telescopic rod; 3 - connecting part; 4 - inner cylinder; 5 - lead screw; 501 - guide rod; 6 - motor 1; 7 - push cylinder; 8 - limit disk; 801 - limit ball; 9 - threaded cylinder; 10 - pressing ring; 11 - extrusion part; 12 - spring 1; 13 - clamping part; 14 - spring 2; 15 - sliding seat; 16 - installation cylinder; 17 - scraping part; 18 - sealing disk; 19 - spiral spring; 20 - gear 1; 21 - gear 2; 22 - rotating shaft; 23 - gear 3; 24 - toothed disk; 25 - cable; 26 - support cylinder; 27 - winding drum; 28 - winding motor; 29 - rubber column; 30 - support rod; 31 - spring 3; 32 - limit rod; 3201 - telescopic tube; 33 - oil pipe; 34 - transmission box; 35 - pushing electric cylinder; 36 - push rod; 37 - push wheel; 38 - contact part; 39 - spring 4. Detailed implementation manners

[0026] Embodiment: As Figures 1 to 13 shown, a telescopic downhole connection device includes an outer cylinder 1, a telescopic rod 2 and a connecting part 3. The telescopic rod 2 is fixedly connected to the connecting part 3. A cable 25 is installed inside the outer cylinder 1, the telescopic rod 2 and the connecting part 3, and a spiral area is arranged on the cable 25; an inner cylinder 4 is arranged inside the outer cylinder 1, and the telescopic rod 2 is slidably matched with the inner cylinder 4; locking mechanisms are respectively arranged at the end parts of the connecting part 3 and the outer cylinder 1 for locking the cable 25; a scraping mechanism is arranged at one end of the outer cylinder 1, and the scraping mechanism includes a scraping part 17 rotatably installed on the end face of the outer cylinder 1; a support mechanism is arranged inside the telescopic rod 2 for limiting the spiral area on the cable 25 to the central area of the telescopic rod 2 so that the spiral area does not contact the inner wall of the telescopic rod 2; the support mechanism includes a support cylinder 26 arranged inside the telescopic rod 2, and limit rods 32 are arranged on the support cylinder 26 in an array and telescopically; a winding mechanism is also arranged inside the telescopic rod 2 for winding and tensioning the cable 25.

[0027] Limit disks 8 are arranged in an array inside the inner cylinder 4. A hole is opened on the inner side of the limit disk 8, and limit balls 801 are arranged on the inner wall of the hole for limiting the cable 25.

[0028] The locking mechanism includes a threaded cylinder 9 provided at the connecting portion 3 and the end of the outer cylinder 1. A push cylinder 7 is threadedly connected to the outside of the threaded cylinder 9. The locking mechanism further includes a pressing ring 10 axially telescopically arranged and a clamping portion 13 radially telescopically arranged. An extrusion portion 11 is provided inside the pressing ring 10, and the extrusion portion 11 is used to push the clamping portion 13; on the end of the connecting portion 3, a first spring 12 is connected between the pressing ring 10 and the connecting portion 3, and a second spring 14 is connected between the clamping portion 13 and the connecting portion 3; on the end of the outer cylinder 1, a first spring 12 is connected between the pressing ring 10 and the outer cylinder 1, and a second spring 14 is connected between the clamping portion 13 and the outer cylinder 1. The pressing ring 10 is pushed by the top of the push cylinder 7.

[0029] Inside the outer cylinder 1, a first motor 6, a lead screw 5 and a guide rod 501 are provided. The first motor 6 is used to drive the lead screw 5. One end of the telescopic rod 2 facing the outer cylinder 1 is provided with a sliding seat 15. The sliding seat 15 is slidably matched with the inner cylinder 4. The sliding seat 15 is movably arranged on the lead screw 5 and the guide rod 501, and the sliding seat 15 forms a screw pair with the lead screw 5. The sliding seat 15 moves to drive the scraping mechanism; the scraping mechanism includes a mounting cylinder 16 rotatably arranged at one end inside the outer cylinder 1. A torsion spring 19 is provided inside the mounting cylinder 16. One end of the torsion spring 19 is connected to the sliding seat 15. At one end of the mounting cylinder 16, a first gear 20 is provided. The rotating shaft of the first gear 20 is connected to the center of the torsion spring 19. At the end of the outer cylinder 1, a rotating shaft 22 is rotatably mounted. At both ends of the rotating shaft 22, a second gear 21 and a third gear 23 are respectively provided. The second gear 21 meshes with the first gear 20. A toothed disc 24 is connected to the scraping portion 17, and the toothed disc 24 meshes with the third gear 23; on the end face of the outer cylinder 1, a sealing disc 18 is further provided. A gap is reserved between the sealing disc 18 and the end face of the outer cylinder 1. The toothed disc 24 is rotatably arranged in the gap, and the third gear 23 is located in the gap.

[0030] The support mechanism includes a transmission box 34 provided inside the support cylinder 26. An oil pipe 33 is communicated with the transmission box 34 for transmitting lubricating oil. A push electric cylinder 35 is provided inside the support cylinder 26. A push rod 36 is provided on the telescopic rod of the push electric cylinder 35. A push wheel 37 is provided on the push rod 36. Spray holes are provided on the limiting rod 32, and a telescopic pipe 3201 is provided on the limiting rod 32. The telescopic pipe 3201 is slidably connected to the support cylinder 26. The telescopic pipe 3201 is communicated with the oil pipe 33, and a fourth spring 39 is sleeved on the telescopic pipe 3201; a contact portion 38 is provided at the end of the telescopic pipe 3201, and the contact portion 38 is pushed by the push wheel 37.

[0031] The winding mechanism includes a winding motor 28 and a winding drum 27 provided inside the telescopic rod 2. The winding drum 27 is driven by the winding motor 28. A rubber column 29 is provided inside the winding drum 27, and a support rod 30 is telescopically arranged on the circumference of the winding drum 27. A third spring 31 is connected between the support rod 30 and the winding drum 27.

[0032] Working principle: In this embodiment, it can be adaptively adjusted according to the lengths of the drill pipe and the drill collar. Specifically, by operating the first motor 6, the lead screw 5 rotates, causing the slide block 15 and the telescopic rod 2 to move, thereby achieving length adjustment. For the internal cable 25, a spiral area is provided thereon, enabling adaptive telescopic adjustment. Specifically, during operation, due to external vibration, the spiral area on the cable 25 will sway inside the telescopic rod 2 and frequently impact the inner wall of the telescopic rod 2, affecting the communication signal. Therefore, in this embodiment, the spiral area on the cable 25 is supported and limited by the limiting rod 32, positioning it in the central area of the telescopic rod 2 to avoid direct contact with the inner wall of the telescopic rod 2. When there is external vibration, the spiral area of the cable 25 will not impact the inner wall of the telescopic rod 2. That is, on the premise of adaptive telescopic adjustment, the cable 25 can be prevented from frequently impacting the inner wall of the telescopic rod 2, reducing the vibration of the cable 25, which is beneficial to improving the communication signal. Further, when telescopic adjustment is required, the push rod 36 can be moved by controlling the electric cylinder 35, and the push wheel 37 pushes the contact part 38, causing the limiting rod 32 to move, thus releasing the limiting state of the spiral area of the cable 25. Moreover, the transmission box 34 can transmit lubricating oil, which is released through the spray holes on the limiting rod 32, i.e., sprayed on the cable 25, reducing friction and being beneficial for protecting the cable 25. When in the limiting state, during external vibration, the limiting rod 32 can be buffered under the action of the fourth spring 39 to reduce the vibration effect. In the outer cylinder 1, the straight area of the cable 25 passes through the holes on the limiting disk 8 for support. The straight area of the cable 25 in the telescopic rod 2 is wound around the reel 27. That is, the reel 27 is driven by the winding motor 28 to perform two-way winding and unwinding of the cable 25. When the cable 25 contracts, the reel 27 adaptively winds the cable 25 to keep the straight area of the cable 25 in a tensioned state, preventing it from contacting and impacting the inner wall of the telescopic rod 2 under the influence of external vibration. The cable 25 is wound on the reel 27, and the support rod 30 contacts the cable 25. During external vibration, the support rod 30 can be buffered under the action of the third spring 31, and the rubber column 29 is located in the telescopic direction of the support rod 30, also buffering the vibration through contact.

[0033] Further, during telescopic adjustment, the slide block 15 drives the coil spring 19 to move, then the first gear 20 rotates. Under gear transmission, the toothed disk 24 rotates, and the scraping part 17 rotates to remove impurities on the telescopic rod 2. External mud flows on the surface of the telescopic rod 2, and some impurities adhere to the telescopic rod 2. When the telescopic rod 2 expands and contracts, these impurities will block the end of the outer cylinder 1. Therefore, by rotating the scraping part 17, the impurities can be removed to prevent blockage. Further, after the coil spring 19 is stretched, it has its own torsion and can achieve automatic reset. Therefore, no matter in which direction the telescopic rod 2 expands and contracts, the impurities can be removed.

Claims

1. A telescopic downhole connection device, comprising an outer cylinder (1), a telescopic rod (2) and a connection part (3), the telescopic rod (2) is fixedly connected to the connection part (3), and is characterized in that: A cable (25) is installed inside the outer cylinder (1), the telescopic rod (2) and the connecting part (3), and a spiral area is arranged on the cable (25); an inner cylinder (4) is arranged inside the outer cylinder (1), and the telescopic rod (2) is slidably matched with the inner cylinder (4); locking mechanisms are respectively arranged at the end parts of the connecting part (3) and the outer cylinder (1) for locking the cable (25); a scraping mechanism is arranged at one end of the outer cylinder (1), and the scraping mechanism includes a scraping part (17) rotatably installed on the end face of the outer cylinder (1); a supporting mechanism is arranged inside the telescopic rod (2) for limiting the spiral area on the cable (25) to the central area of the telescopic rod (2) so that the spiral area does not contact the inner wall of the telescopic rod (2); the supporting mechanism includes a supporting cylinder (26) arranged inside the telescopic rod (2), and limiting rods (32) are arranged on the supporting cylinder (26) in an array and can telescopically move; a winding mechanism is also arranged inside the telescopic rod (2) for winding and tensioning the cable (25). An expansion tube (3201) is arranged on the limiting rod (32), and the expansion tube (3201) is slidably connected with the supporting cylinder (26); a fourth spring (39) is sleeved on the expansion tube (3201); the limiting rod (32) supports and limits the spiral area on the cable (25). A lead screw (5) is arranged inside the outer cylinder (1), a sliding seat (15) is arranged at one end of the telescopic rod (2) facing the outer cylinder (1), the sliding seat (15) is slidably matched with the inner cylinder (4), and the sliding seat (15) is driven by the lead screw (5). The winding mechanism includes a winding drum (27) arranged inside the telescopic rod (2), and supporting rods (30) are arranged on the circumference of the winding drum (27) and can telescopically move, and a third spring (31) is connected between the supporting rod (30) and the winding drum (27).

2. The telescopic downhole connection device according to claim 1, wherein: A plurality of limiting disks (8) are arranged in an array inside the inner cylinder (4), holes are formed inside the inner sides of the limiting disks (8), and limiting balls (801) are arranged on the inner walls of the holes for limiting the cable (25).

3. A telescopic downhole connection device according to claim 1, characterized in that: The locking mechanism includes threaded cylinders (9) arranged at the end parts of the connecting part (3) and the outer cylinder (1), a pushing cylinder (7) is connected to the outer side of the threaded cylinder (9) by threads, the locking mechanism further includes an axially telescopic pressing ring (10) and a radially telescopic clamping part (13), an extrusion part (11) is arranged inside the pressing ring (10), and the extrusion part (11) is used for pushing the clamping part (13); on the end part of the connecting part (3), a first spring (12) is connected between the pressing ring (10) and the connecting part (3), and a second spring (14) is connected between the clamping part (13) and the connecting part (3); on the end part of the outer cylinder (1), a first spring (12) is connected between the pressing ring (10) and the outer cylinder (1), and a second spring (14) is connected between the clamping part (13) and the outer cylinder (1); the pressing ring (10) is pushed by the top of the pushing cylinder (7).

4. A telescopic downhole connection device according to claim 1, characterized in that: Inside the outer cylinder (1), there is a first motor (6) and a guide rod (501). The first motor (6) is used to drive the lead screw (5). The sliding seat (15) is movably arranged on the lead screw (5) and the guide rod (501). The sliding seat (15) and the lead screw (5) form a screw pair. The sliding seat (15) moves to drive the scraping mechanism.

5. The telescopic downhole connection device according to claim 4, characterized in that: The scraping mechanism includes a mounting cylinder (16) rotatably arranged at one end inside the outer cylinder (1). Inside the mounting cylinder (16), there is a torsion spring (19). One end of the torsion spring (19) is connected to the sliding seat (15). At one end of the mounting cylinder (16), there is a first gear (20). The rotating shaft of the first gear (20) is connected to the center of the torsion spring (19). At the end of the outer cylinder (1), a rotating shaft (22) is rotatably mounted. At both ends of the rotating shaft (22), there are a second gear (21) and a third gear (23) respectively. The second gear (21) meshes with the first gear (20). A toothed disc (24) is connected to the scraping part (17). The toothed disc (24) meshes with the third gear (23). On the end face of the outer cylinder (1), there is also a sealing disc (18). There is a gap reserved between the sealing disc (18) and the end face of the outer cylinder (1). The toothed disc (24) is rotatably arranged in the gap, and the third gear (23) is located in the gap.

6. The telescopic downhole connection device according to claim 1, characterized in that: The support mechanism includes a transmission box (34) arranged inside the support cylinder (26). An oil pipe (33) is connected to the transmission box (34) for transmitting lubricating oil. Spray holes are provided on the limit rod (32). The telescopic pipe (3201) is connected to the oil pipe (33). Inside the support cylinder (26), there is a push cylinder (35). A push rod (36) is arranged on the telescopic rod of the push cylinder (35). A push wheel (37) is arranged on the push rod (36).

7. The telescopic downhole connection device according to claim 6, characterized in that: The end of the telescopic pipe (3201) is provided with a contact part (38). The contact part (38) is pushed by the push wheel (37).

8. A telescopic downhole connection device according to claim 1, characterized in that: The winding mechanism includes a winding motor (28) arranged inside the telescopic rod (2). The winding drum (27) is driven by the winding motor (28). Inside the winding drum (27), there is a rubber column (29).

Images