tensioning ring

Abstract

The present application relates to a kind of tension rings, including tension ring body and driving plate, between tension ring body and driving plate by driving system connection, driving system is used to drive driving plate rotation;Several external locking blocks are uniformly connected on the outer wall of tension ring body along its circumferential direction, each external locking block is connected with driving plate, driving plate rotation can drive all external locking blocks movement along the diameter direction of tension ring body;Core is limited to be provided in tension ring body, and core is used to support the completion tool and / or completion standpipe in the well completion operation;Each pin shaft mounting groove on the side wall of tension ring body is connected with suspension pin shaft, each suspension pin shaft extends to contact with core, and each suspension pin shaft can move along the diameter direction of tension ring body.The tension ring of the present application can simultaneously adapt to drilling, oil production, workover, completion and other operation conditions, improve the multi-condition adaptability and on-site operability of tension ring.

Description

Technical Field

[0001] This invention belongs to the field of marine petroleum engineering, specifically relating to a tensioning ring that can adapt to multiple operating conditions such as drilling, oil production, well workover, and well completion. Background Technology

[0002] Tensioner rings are key equipment in offshore drilling riser systems. During operation, they are connected to the expansion joint and tensioner, bearing the tension force of the entire riser string. They are a very important load-bearing device in offshore drilling riser systems. Due to the significant differences in the specifications and dimensions of risers and tools used in drilling, oil production, well workover, and well completion operations, specific tensioner rings are required for different operating conditions.

[0003] Existing technologies disclose a rotary split-type riser tensioning ring and a riser tensioning ring with a self-locking function. The former is equipped with a thrust bearing, while the latter is without a bearing. However, both types of tensioning rings require manual connection and unlocking of the two halves by on-site operators during operation. Existing technologies also disclose a hydraulically operated integral riser tensioning ring. This ring features a rotary seal and multiple discharge terminals for the side pipes, allowing for remote operation. However, this ring has a fixed opening size, resulting in poor adaptability. Furthermore, because it has multiple discharge terminals for the side pipes, aligning the multiple side pipe seal mandrels during installation is difficult. Existing technology also discloses a rack and pinion driven remote-operated tensioning ring, on which a suspension pin assembly is fixed on the top outer wall of the upper ring cover. The rack and pinion transmission mechanism drives the locking pin shaft to rotate, thereby changing the opening size of the tensioning ring and locking or unlocking the tensioning ring with the offshore drilling riser system. However, this technology has the disadvantages of a small tensioning ring bearing area and no function to prevent backflow of the offshore drilling riser when the single-layer suspension is used.

[0004] In summary, existing tensioning rings have drawbacks such as requiring manual connection and unlocking of the two halves by on-site operators, poor adaptability, difficulty in aligning multiple side pipe sealing mandrels during installation, and small bearing area. Furthermore, existing tensioning rings are limited to riser drilling conditions and there is currently no external locking block type tensioning ring that can adapt to multiple operating conditions such as drilling, oil production, well workover, and well completion. Summary of the Invention

[0005] In order to solve all or some of the above problems, the present invention aims to provide a tensioning ring that can adapt to multiple working conditions such as drilling, oil production, well workover, and well completion, thereby improving the multi-condition adaptability and on-site operability of the tensioning ring and greatly reducing the operating costs of various working conditions.

[0006] According to one aspect of the present invention, a tensioning ring is provided, comprising a tensioning ring body and a drive plate sleeved on the outside of the tensioning ring body, wherein the tensioning ring body and the drive plate are connected by a drive system for driving the drive plate to rotate.

[0007] Several external locking blocks are evenly connected along the circumference of the outer wall of the tension ring body. Each external locking block is connected to the drive plate. The rotation of the drive plate can drive all the external locking blocks to move along the diameter of the tension ring body so that the external locking blocks are locked with the telescopic device, or so that the external locking blocks are disengaged from the telescopic device.

[0008] The tensioning ring body is internally limited by a core, which is used to support the completion tools and / or completion standpipes run in the well completion operation; a plurality of pin mounting slots are evenly opened on the side wall of the tensioning ring body along its circumference, and each pin mounting slot is connected to a suspension pin, each suspension pin extends to contact the core, and each suspension pin can move along the diameter of the tensioning ring body to lock or release the core.

[0009] Furthermore, the drive system includes a drive hydraulic cylinder, one end of which is hinged to the drive plate, and the other end of which is hinged to the tension ring body.

[0010] Furthermore, a body fixing seat is fixedly connected to the tension ring body by a first bolt, and the other end of the driving hydraulic cylinder is hinged to the tension ring body by a first connecting pin; a driving plate fixing seat is fixedly connected to the driving plate by a second bolt, and one end of the driving hydraulic cylinder is hinged to the driving plate by a second connecting pin; the driving system includes two or more symmetrically arranged systems, and all the driving systems have the same structure.

[0011] Furthermore, the drive plate is provided with a drive groove corresponding to each of the external locking blocks. Each drive groove is a groove with one end close to the axis of the drive plate and the other end extending away from the axis of the drive plate in the same direction. The outer wall of the tension ring body is provided with locking block mounting holes corresponding to the number of external locking blocks. Each locking block mounting hole is located on the diameter of the tension ring body. Each mounting hole contains one external locking block. Each external locking block is connected to the drive plate through the corresponding drive groove via a drive connection assembly. The drive plate rotates and drives the corresponding external locking block through the drive connection assembly, so that all the external locking blocks extend outward or retract inward.

[0012] Furthermore, each of the external locking blocks is provided with a connecting through hole extending from the upper end to the lower end, and each of the drive connection assemblies includes a connecting screw. Each connecting screw passes through the corresponding connecting through hole and the corresponding drive groove, and a washer and nut are connected to one end. The drive plate rotates and drives the corresponding external locking block through the connecting screw, so that all the external locking blocks extend outward or retract inward.

[0013] Furthermore, the tensioning ring body is provided with a first annular groove extending from its upper end to its middle part, and the outer wall of the supplementary core is provided with a first annular step. The supplementary core is limited and positioned in the tensioning ring body by the cooperation of the first annular groove and the first annular step. The side wall of the supplementary core is provided with a limiting slot for the suspension pin to extend into. After the suspension pin extends into the limiting slot, it can limit the upward recoil movement of the supplementary core.

[0014] Furthermore, the core includes a first core and a second core, the first annular step and the limiting slot are both provided on the outer wall of the first core; the inner wall of the first core is provided with a second annular groove extending from its upper end to its middle part, the outer wall of the second core is provided with a second annular step, and the second core is limited and positioned in the first core by the cooperation of the second annular groove and the second annular step.

[0015] The first patch core is composed of at least two sector blocks, and the second patch core is composed of at least two sector blocks.

[0016] Furthermore, for any one of the suspension pins, a flange is fixedly connected to the tensioning ring body corresponding to the pin mounting groove. The suspension pin is limited between the flange and the pin mounting groove. A first sealing structure is provided between the flange and the tensioning ring body. Two second sealing structures are provided between the suspension pin and the pin mounting groove. A first hydraulic cavity is formed between the two second sealing structures. A second hydraulic cavity is formed between the first sealing structure and the second sealing structure near the first sealing structure. The tensioning ring body is provided with a first fluid hole communicating with each of the first hydraulic cavities and a second fluid hole communicating with each of the second hydraulic cavities.

[0017] Furthermore, each of the flanges is threaded with an anti-retraction bolt, and each of the flanges is fixedly connected to the tensioning ring body by a third bolt.

[0018] Furthermore, the drive plate is provided with a first pin mounting hole corresponding to each of the external locking blocks. After the external locking blocks are locked with the telescopic device, each of the external locking blocks is provided with a second pin mounting hole corresponding to the corresponding first pin mounting hole. The drive plate and each of the external locking blocks are connected by a safety pin passing through the first pin mounting hole and the corresponding second pin mounting hole. A working ear plate is provided on the outer side wall of the tensioning ring body.

[0019] As can be seen from the above technical solution, the tensioning ring provided by the present invention has the following beneficial effects:

[0020] The tensioning ring of this invention can adapt to multiple operating conditions such as drilling, oil production, well workover, and well completion, realizing "one ring for multiple uses". It improves the adaptability of the tensioning ring to multiple operating conditions and its on-site operability, greatly reduces the operating costs of various operating conditions, and solves the problem of frequent operating accidents. In addition, the setting of the external locking block solves the problem that the position of the locking block cannot be directly observed during conventional riser drilling operations, which affects the efficiency and safety of on-site operations. Attached Figure Description

[0021] Figure 1 This is a front view of the tensioning ring according to an embodiment of the present invention;

[0022] Figure 2 This is a top view of an embodiment of the present invention;

[0023] Figure 3 This is a bottom view of an embodiment of the present invention;

[0024] Figure 4 for Figure 2 Sectional view along line AA in the middle;

[0025] Figure 5 This is a schematic diagram of the driver board according to an embodiment of the present invention. Detailed Implementation

[0026] To better understand the purpose, structure, and function of this invention, a tensioning ring of this invention will be described in further detail below with reference to the accompanying drawings.

[0027] like Figure 1 , Figure 2 and Figure 4As shown, this invention illustrates a tension ring according to an embodiment of the present invention, comprising a tension ring body 1 and a drive plate 6 sleeved on the outside of the tension ring body 1. The tension ring body 1 and the drive plate 6 are connected by a drive system 7, which drives the drive plate 6 to rotate. A plurality of external locking blocks 3 are uniformly connected along the circumferential direction on the outer wall of the tension ring body 1. Each external locking block 3 is connected to the drive plate 6. Rotation of the drive plate 6 can drive all the external locking blocks 3 to move along the diametrical direction of the tension ring body 1, so that the external locking blocks 3 are engaged with the drive plate 6. The telescopic device is locked, or the external locking block 3 is disengaged from the telescopic device; a core is provided inside the tension ring body 1 for limiting the use of the core to support the well completion tools and / or well completion standpipes that are lowered into the well completion operation; several pin mounting slots are evenly provided on the side wall of the tension ring body 1 along its circumference, and a suspension pin 201 is connected to each pin mounting slot. Each suspension pin 201 extends to contact the core, and each suspension pin 201 can move along the diameter of the tension ring body 1 to lock or release the core.

[0028] The tensioning ring in this embodiment includes a tensioning ring body 1, and the tensioning ring body 1 and the drive plate 6 are connected by a drive system 7. Therefore, the drive system 7 can drive the drive plate to rotate. When the drive plate 6 rotates, it can drive all the external locking blocks 3 to extend outward along the diameter direction of the tensioning ring body 1, or drive all the external locking blocks 3 to retract inward along the diameter direction of the tensioning ring body 1. When all the external locking blocks 3 retract inward along the diameter direction of the tensioning ring body 1, they can be used to lock the tensioning ring and the bearing flange of the telescopic device during normal drilling operations, so as to bear the weight of the entire marine drilling riser and the force of the tensioner. When all the external locking blocks 3 extend outward along the diameter direction of the tensioning ring body 1, they are used to unlock the tensioning ring and the telescopic device.

[0029] The tensioning ring body 1 includes an adjustable inner core with a diameter that accommodates small-diameter completion tools or medium-diameter completion risers, supporting the tools or risers during well completion operations. Each mounting slot on the sidewall of the tensioning ring body 1 has a suspension pin 201 that can move inward along the diameter of the body to lock the inner core, thus supporting the small-diameter tools or risers. The suspension pin 201 can also move outward along the diameter of the body to release the inner core, or move outward to a diameter larger than the inner diameter of the tensioning ring body 1, providing operating space for the lowering or retrieval of risers and tools during drilling, oil production, and well completion operations. This is the suspension condition, in which the tensioning ring of this embodiment is suspended on the outer shell of the distributor.

[0030] This embodiment can simultaneously adapt to multiple operating conditions such as drilling, oil production, well workover, and well completion; and the setting of the external locking block 3 makes it easy to observe its position intuitively, which solves the problem that the position of the locking block cannot be directly observed after the existing tensioning ring is locked, thereby improving operational safety.

[0031] Among them, such as Figure 3 As shown, the drive system 7 includes a drive hydraulic cylinder 701, one end of which is hinged to the drive plate 6, and the other end of which is hinged to the tension ring body 1.

[0032] The drive system in this embodiment includes a drive hydraulic cylinder 701. The piston rod of the drive hydraulic cylinder extends or retracts accordingly, causing the drive plate to rotate clockwise and the piston to rotate counterclockwise.

[0033] Specifically, a body fixing seat 704 is fixedly connected to the tension ring body 1 by a first bolt 705, and the other end of the driving hydraulic cylinder 701 is rotatably connected to the tension ring body 1 by a first connecting pin 703; a driving plate fixing seat 702 is fixedly connected to the driving plate 6 by a second bolt 7051, and one end of the driving hydraulic cylinder 701 is rotatably connected to the driving plate 6 by a second connecting pin 7031.

[0034] For the drive system, in specific implementation, there may be two or more drive systems, and the structure of the drive systems is the same; when there are two drive systems, the two drive systems are set symmetrically; when there are three or more drive systems, all drive systems are set symmetrically with the axis of the tension ring body 1 as the center.

[0035] In one embodiment, such as Figure 5 As shown, the drive plate 6 is provided with a drive groove 601 corresponding to each external locking block 3. Each drive groove 601 is a groove with one end close to the axis of the drive plate 6 and the other end extending away from the axis of the drive plate 6 in the same direction (clockwise or counterclockwise). The outer wall of the tension ring body 1 is provided with locking block mounting holes corresponding to the number of external locking blocks 3. Each locking block mounting hole is located on the diameter of the tension ring body 1, and each mounting hole is provided with an external locking block 3. Each external locking block 3 is connected to the drive plate 6 through the corresponding drive groove 601 via the drive connection assembly 4. The drive plate 6 rotates and drives the corresponding external locking block 3 through the drive connection assembly 4, so that all the external locking blocks 3 extend outward or retract inward.

[0036] For the external locking block 3 and the tensioning ring body 1, the outer wall of the tensioning ring body 1 is provided with locking block mounting holes corresponding to the number of external locking blocks 3. These locking block mounting holes are used to place the external locking blocks. Each locking block mounting hole is located on the diameter of the tensioning ring body 1, that is, the extension line of each locking block mounting hole along its depth direction passes through the axis of the tensioning ring body 1. Thus, the locking block mounting holes restrict the external locking blocks to only retract inward or extend outward along the diameter direction of the tensioning ring body 1.

[0037] For the drive slots on the drive board, each drive slot is a centering curve with one end close to the axis of the drive board 6 and the other end extending in the same direction away from the axis of the drive board 6. For example, the other end of each drive slot extends clockwise away from the axis of the drive board 6, or the other end of each drive slot extends counterclockwise away from the axis of the drive board 6. Figure 3 As shown. In specific implementations, for example, each drive slot 601 is an involute or an Archimedean spiral.

[0038] Regarding the external locking blocks and the drive plate, each external locking block 3 is connected to the drive plate 6 via a drive connection assembly 4 passing through the corresponding drive slot 601. When the drive plate rotates clockwise or counterclockwise under the drive of the hydraulic cylinder, it correspondingly drives the external locking block to move along the locking block mounting hole.

[0039] In one embodiment, such as Figure 4 As shown, each drive connection assembly 4 includes a connecting screw 401, and each external locking block 3 has a connecting through hole extending from the upper end to the lower end. Each connecting screw 401 has a washer 402 and a nut 403 connected to one end of the corresponding connecting through hole and the corresponding drive groove. The drive plate 6 rotates and drives the corresponding external locking block 3 through the connecting screw 401, so that all the external locking blocks 3 extend outward or retract inward.

[0040] Each drive connection assembly 4 in this embodiment includes a connecting screw 401. The connecting screw passes through the connecting through hole and drive groove of the external locking block to connect the external locking block and the drive plate. In this embodiment, when the drive plate rotates, it drives the drive groove to rotate synchronously. Due to the limitation of the locking block mounting hole, the external locking block can only move along the depth direction of the locking block mounting hole. Therefore, the synchronous rotation of the drive groove causes the connecting screw 401 to move along the diameter direction of the tension ring body 1, thereby causing the external locking block to move along the depth direction of the locking block mounting hole, that is, the diameter direction of the tension ring body 1.

[0041] In one embodiment, a first annular groove extending from its upper end to its middle is provided inside the tension ring body 1, and a first annular step 81 is provided on the outer wall of the supplement core. The supplement core is limited and positioned inside the tension ring body 1 by the cooperation of the first annular groove and the first annular step. A limiting slot is provided on the side wall of the supplement core for the insertion of a suspension pin. After the suspension pin is inserted into the limiting slot, it can limit the upward recoil movement of the supplement core.

[0042] In this embodiment, the first annular groove cooperates with the first annular step to limit the core within the tension ring body 1; and the limiting slot on the side wall of the core allows the suspension pin to extend into it. After the suspension pin extends into the limiting slot, it can limit the upward recoil of the core, thereby limiting the core within the tension ring body 1.

[0043] In one embodiment, the core includes a first core 8 and a second core 9. A first annular step and a limiting slot are both provided on the outer wall of the first core 8. The inner wall of the first core is provided with a second annular groove extending from its upper end to its middle. The outer wall of the second core 9 is provided with a second annular step. The second core 9 is limited and positioned in the first core 8 by the cooperation of the second annular groove and the second annular step.

[0044] The filler core in this embodiment includes a first filler core 8 and a second filler core 9. The inner diameter of the first filler core is larger than that of the second filler core, and the first filler core mates with the through hole of the tensioning ring body 1. For well completion operations, the second filler core is provided to accommodate small-diameter well completion tools, such as 6-5 / 8" specification well completion tools. After the small-diameter well completion tool is run in, the second filler core 9 is removed. The first filler core is provided to accommodate medium-diameter well completion standpipes, such as 9-5 / 8" specification well completion standpipes. After the medium-diameter well completion standpipe is run in, the first filler core 8 is removed.

[0045] In practice, the first patch core 8 is, for example, composed of at least two sector-shaped blocks, and the second patch core 9 is, for example, composed of at least two sector-shaped blocks. Furthermore, when both the first patch core 8 and the second patch core 9 are composed of two sector-shaped blocks, the joints of the first patch core and the second patch core are staggered during installation; for example, the two joints are perpendicular to each other.

[0046] In one embodiment, such as Figure 4As shown, for any suspension pin 201, a flange 202 is fixedly connected to the tensioning ring body 1 at the corresponding pin mounting groove. The suspension pin 201 is limited between the flange 202 and the pin mounting groove. A first sealing structure is provided between the flange 202 and the tensioning ring body 1. Two second sealing structures are provided between the suspension pin 201 and the pin mounting groove. A first hydraulic cavity is formed between the two second sealing structures. A second hydraulic cavity is formed between the first sealing structure and the second sealing structure near the first sealing structure. The tensioning ring body 1 is provided with a first fluid hole connecting each first hydraulic cavity and a second fluid hole connecting each second hydraulic cavity.

[0047] In specific implementation, for example, 3 to 30 suspension pins 201 are set. The tensioning ring body 1 is evenly provided with a corresponding number of pin mounting slots, and a suspension pin 201 is set in each pin mounting slot.

[0048] In this embodiment, a flange 202 is also fixedly connected to the tensioning ring body 1 at the location of each suspension pin 201. The flange is used to cooperate with the limiting step in the pin mounting groove so that the suspension pin 201 is limited between the flange 202 and the limiting step.

[0049] Each flange 202 and tension ring body 1 is provided with a first sealing structure, and each suspension pin 201 and corresponding pin mounting groove are provided with two second sealing structures. The three sealing structures form two hydraulic cavities: a first hydraulic cavity between the two second sealing structures, and a second hydraulic cavity between the first sealing structure and the second sealing structure near the first sealing structure. When pressure is applied to the second hydraulic cavity through the second liquid hole, the hydraulic pressure can cause the suspension pin 201 to move towards the core to lock the core. When pressure is applied to the first hydraulic cavity through the first liquid hole, the hydraulic pressure can cause the suspension pin 201 to move away from the core to release the core.

[0050] In practice, each flange 202 is fixedly connected to the tensioning ring body 1 by a third bolt 204.

[0051] Each flange is threaded with an anti-retraction bolt 203. The anti-retraction bolt 203 can be used as a mechanical secondary locking after hydraulic failure. That is, by rotating the anti-retraction bolt 203 into the pin mounting groove, the anti-retraction bolt 203 drives the suspension pin 201 to move into the pin mounting groove. The anti-retraction bolt 203 can also be used as an indicator to determine the locking and unlocking status and position.

[0052] In one embodiment, the drive plate 6 is provided with a first pin mounting hole corresponding to each external locking block 3. After the external locking block 3 is locked with the telescopic device, each external locking block 3 is provided with a second pin mounting hole corresponding to the corresponding first pin mounting hole. The drive plate 6 and each external locking block 3 are connected by a safety pin 5 passing through the first pin mounting hole and the corresponding second pin mounting hole. A working ear plate 101 is provided on the outer side wall of the tension ring body 1.

[0053] In this embodiment, the safety pin 5 is used to connect the drive plate 6 and each external locking block 3 after the external locking block 3 is locked with the telescopic device to fix the position of the external locking block 3, thereby reducing accidents caused by the accidental unlocking of the external locking block 3.

[0054] The working ear plate 101 on the outer wall of the tensioning ring body 1 is used to connect to the water pipe tensioner via a rope.

[0055] The working principle of the tensioning ring in the embodiments of the present invention is explained as follows:

[0056] For the suspension condition without the first and second supplementary cores 8 and 9 installed: the hydraulic difference between the first and second hydraulic chambers causes the suspension pin 201 to move towards the locking groove of the distributor housing until the suspension pin 201 is locked to the distributor housing. At this time, the opening size of the suspension pin 201 is larger than the diameter of the tension ring, so as to provide operating space for drilling, oil production, and well completion operations for the lowering or retrieval of risers and tools. In the suspension condition, the tension ring is always suspended on the distributor housing.

[0057] For normal well completion operations: First, connect the working ear plate 101 of the tensioning ring body 1 to the riser tensioner. Then, drive the suspension pin 201 to move away from the locking groove of the diverter housing through the hydraulic difference between the first and second hydraulic chambers until it unlocks from the diverter housing. Next, suspend the suspension pin 201 on the tensioner through the hydraulic difference between the first and second hydraulic chambers. Then, drive the suspension pin 201 towards the first filler core 8 through the hydraulic difference until it locks with the first filler core 8. According to the well completion operation procedure, lower a small-diameter well completion tool (such as a 6-5 / 8" specification well completion tool) using the second annular step support inside the second filler core 9. After the small-diameter well completion tool is lowered, remove the second filler core 9. Then, lower a medium-diameter well completion standpipe (such as a 9-5 / 8" specification well completion standpipe) using the first annular step support inside the first filler core 8. After the medium-diameter well completion standpipe is lowered, remove the first filler core 8.

[0058] For normal drilling operations where the completion work string has been lowered, the tension ring is suspended on the tensioner, and the suspension pin 201 has been unlocked from the distributor housing. The first and second filler cores 8 and 9 need to be removed. After the telescopic device is lowered to the predetermined position, the tensioner drives the tension ring to move upward. The drive hydraulic cylinder 701 drives the drive plate 6 to rotate. The rotation of the drive plate 6 causes the external locking block 3 to contact the stepped surface of the telescopic device bearing flange through the drive groove 601, thereby locking the external locking block 3 of the tension ring with the telescopic device.

[0059] The tensioning ring of this invention can adapt to multiple operating conditions such as drilling, oil production, well workover, and well completion, realizing "one ring for multiple uses". It improves the adaptability of the tensioning ring to multiple operating conditions and its on-site operability, greatly reduces the operating costs of various operating conditions, and solves the problem of frequent operating accidents. In addition, the setting of the external locking block solves the problem that the position of the locking block cannot be directly observed during conventional riser drilling operations, which affects the efficiency and safety of on-site operations.

[0060] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0061] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tensioning ring, characterized in that, It includes a tension ring body (1) and a drive plate (6) sleeved on the tension ring body (1). The tension ring body (1) and the drive plate (6) are connected by a drive system (7), which is used to drive the drive plate (6) to rotate. Several external locking blocks (3) are evenly connected on the outer wall of the tension ring body (1) along its circumference. Each external locking block (3) is connected to the drive plate (6). The rotation of the drive plate (6) can drive all the external locking blocks (3) to move along the diameter of the tension ring body (1) so that the external locking blocks (3) are locked with the telescopic device, or so that the external locking blocks (3) are removed from the telescopic device. The tensioning ring body (1) is provided with a core for limiting the movement of the core. The core is used to support the well completion tools and / or well completion standpipes that are lowered into the well completion operation. Several pin mounting slots are evenly provided on the side wall of the tensioning ring body (1) along its circumference. Each pin mounting slot is connected to a suspension pin (201). Each suspension pin (201) extends to contact the core. Each suspension pin (201) can move along the diameter of the tensioning ring body (1) to lock or release the core. The tensioning ring body (1) is provided with a first annular groove extending from its upper end to its middle part. The outer wall of the supplement core is provided with a first annular step. The supplement core is limited and positioned in the tensioning ring body (1) by the cooperation of the first annular groove and the first annular step. The side wall of the supplement core is provided with a limiting slot for the suspension pin to extend into. After the suspension pin extends into the limiting slot, it can limit the upward recoil movement of the supplement core. The supplement core includes a first supplement core (8) and a second supplement core (9). The first annular step and the limiting slot are both provided on the outer wall of the first supplement core (8). The inner wall of the first supplement core is provided with a second annular groove extending from its upper end to its middle part. The outer wall of the second supplement core (9) is provided with a second annular step. The second supplement core (9) is limited and positioned in the first supplement core (8) by the cooperation of the second annular groove and the second annular step. The first supplement core (8) is composed of at least two sector blocks spliced ​​together. The second supplement core (9) is composed of at least two sector blocks spliced ​​together.

2. The tensioning ring according to claim 1, characterized in that, The drive system (7) includes a drive hydraulic cylinder (701), one end of which is hinged to the drive plate (6), and the other end of which is hinged to the tension ring body (1).

3. The tensioning ring according to claim 2, characterized in that, The tensioning ring body (1) is fixedly connected to a body fixing seat (704) by a first bolt (705), and the other end of the driving hydraulic cylinder (701) is hinged to the tensioning ring body (1) by a first connecting pin (703); the driving plate (6) is fixedly connected to a driving plate fixing seat (702) by a second bolt (7051), and one end of the driving hydraulic cylinder (701) is hinged to the driving plate (6) by a second connecting pin (7031); the driving system (7) includes two or more symmetrically arranged systems, and all the driving systems (7) have the same structure.

4. The tensioning ring according to claim 1, characterized in that, The drive plate (6) is provided with a drive groove (601) corresponding to each of the external locking blocks (3). Each drive groove (601) is a groove with one end close to the axis of the drive plate (6) and the other end extending away from the axis of the drive plate (6) in the same direction. The outer wall of the tension ring body (1) is provided with locking block mounting holes corresponding to the number of external locking blocks (3). Each locking block mounting hole is located on the diameter of the tension ring body (1). Each mounting hole is provided with one external locking block (3). Each external locking block (3) is connected to the drive plate (6) through the corresponding drive groove (601) via the drive connection assembly (4). The drive plate (6) rotates and drives the corresponding external locking block (3) through the drive connection assembly (4) so ​​that all the external locking blocks (3) extend outward or retract inward.

5. The tensioning ring according to claim 4, characterized in that, Each of the external locking blocks (3) has a connecting through hole extending from the upper end to the lower end. Each of the drive connection assemblies (4) includes a connecting screw (401). Each connecting screw (401) has a washer (402) and a nut (403) connected to one end of the corresponding connecting through hole and the corresponding drive groove. The drive plate (6) rotates through the connecting screw (401) to drive the corresponding external locking block (3) so that all the external locking blocks (3) extend outward or retract inward.

6. The tensioning ring according to claim 1, characterized in that, For any one of the suspension pins (201), a flange (202) is fixedly connected to the tensioning ring body (1) at the corresponding pin mounting groove. The suspension pin (201) is limited between the flange (202) and the pin mounting groove. A first sealing structure is provided between the flange (202) and the tensioning ring body (1). Two second sealing structures are provided between the suspension pin (201) and the pin mounting groove. A first hydraulic cavity is formed between the two second sealing structures. A second hydraulic cavity is formed between the first sealing structure and the second sealing structure near the first sealing structure. The tensioning ring body (1) is provided with a first liquid hole that connects each of the first hydraulic chambers and a second liquid hole that connects each of the second hydraulic chambers.

7. The tensioning ring according to claim 6, characterized in that, Each of the flanges is threaded with an anti-retraction bolt (203), and each of the flanges (202) is fixedly connected to the tensioning ring body (1) by a third bolt (204).

8. The tensioning ring according to claim 1, characterized in that, The drive plate (6) is provided with a first pin mounting hole corresponding to each of the external locking blocks (3). After the external locking block (3) is locked with the telescopic device, each of the external locking blocks (3) is provided with a second pin mounting hole corresponding to the corresponding first pin mounting hole. The drive plate (6) and each of the external locking blocks (3) are connected by a safety pin (5) passing through the first pin mounting hole and the corresponding second pin mounting hole. The outer side wall of the tension ring body (1) is provided with a working ear plate (101).

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