Bolt hole claw insertion type hydraulic ring type quick wellhead reconstruction device and wellhead reconstruction method

Abstract

The application discloses a bolt hole claw insertion type hydraulic ring type quick well mouth reconstruction device and a well mouth reconstruction method, solves the problem that the existing flange quick installation device cannot realize quick connection of blowout preventers and well mouth large four-way joints when the flange outer edge surface of the well mouth large four-way joint is provided with a plurality of hanger compression top wire seats and grease injection port joints, and the application comprises an upper end flange, an actuator body, a claw assembly, a support assembly and a hydraulic assembly, oil is supplied to a first oil channel through a lock valve, and the oil in an annular groove on the actuator body extrudes a pull rod piston of the claw assembly, so that the pull rod piston drives a pull rod, a claw spring and a locking piston to move downward, when the lower end of the locking piston passes through a bolt hole of the well mouth large four-way joint, an external expansion mechanism at the lower end of the pull rod expands the locking piston; meanwhile, the oil in a steel ring piston driving cavity extrudes the steel ring piston, the steel ring piston moves downward, the bottom end of the steel ring piston is tightly pressed against a flange steel ring groove, and the sealing and quick connection with the well mouth large four-way joint are realized.

Description

Technical Field

[0001] This invention relates to wellhead reconstruction devices, specifically to a bolt hole claw-type hydraulic annular rapid wellhead reconstruction device and a wellhead reconstruction method. Background Technology

[0002] In wellhead equipment setup for oilfield drilling and workover operations, a blowout preventer (BOP) is typically installed on the upper flange of the wellhead cross-connector before construction begins. If a blowout occurs before a BOP or other wellbore control devices are installed, and the piping pressure is low, the lower flange of the BOP can be manually bolted to the upper flange of the wellhead cross-connector for further well control operations. However, if the piping pressure is high or a fire occurs, it is impossible to manually connect the BOP to the wellhead cross-connector for well control operations.

[0003] To address the aforementioned issues, a Chinese invention patent, "Hydraulic Annular Wellhead Casing Flange Quick-Connect Device," with publication number CN111706287B, has emerged. This device can quickly connect to the flange via a quick-locking assembly, and can also connect the blowout preventer to the wellhead cross-connector.

[0004] However, there is a special type of wellhead assembly structure that has multiple hanger clamping screw seats and grease injection port joints on the outer edge of the flange of the large cross-shaped wellhead. Wellheads with this structure will affect the connection between the quick-locking assembly and the flange, causing the aforementioned flange quick-installation device to fail to drop and connect. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem that existing flange quick-installation devices cannot achieve quick connection between the blowout preventer and the wellhead cross-connector when the outer edge of the flange has multiple hangers, clamping screw seats and grease injection port joints. The invention provides a bolt hole claw insertion type hydraulic annular quick wellhead reconstruction device and wellhead reconstruction method.

[0006] To achieve the above objectives, the technical solution provided by this invention is as follows: A bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device, characterized by the following features: This includes the upper flange, actuator body, chuck assembly, support assembly, and hydraulic assembly; The actuator body has a first through hole extending axially through its center. The upper flange is used to connect to the blowout preventer. The upper flange is connected to the top of the actuator body, and a flange center hole is opened at the center corresponding to the first through hole. The upper surface of the actuator body has an annular groove around the first through hole. The top of the groove is closed, and the bottom of the groove has multiple piston holes evenly distributed circumferentially extending axially. There are multiple claw assemblies, each corresponding to a piston hole. The piston holes include a tie rod piston hole, a locking piston hole, and a piston outlet arranged sequentially from top to bottom with decreasing diameters. The claw assembly includes a pull rod, a claw spring sleeved on the pull rod, and a pull rod piston and a locking piston slidably disposed in the pull rod piston hole and locking piston hole, respectively. The lower end of the locking piston extends out of the piston outlet. The upper and lower ends of the pull rod are connected to the pull rod piston and the locking piston, respectively, and the lower end can slide into the locking piston. The two ends of the claw spring abut against the pull rod piston and the locking piston, respectively. The lower end of the pull rod is provided with an external expansion mechanism. When connected to the wellhead cross-connector, the external expansion mechanism expands the locking piston after the lower end of the locking piston passes through the bolt hole of the wellhead cross-connector, thereby connecting the locking piston to the bolt hole. The support assembly includes a hollow inner support sleeve and a return spring and a steel ring piston sequentially fitted onto the inner support sleeve from the inside out. The first through hole includes a support sleeve connection hole and a steel ring piston hole arranged sequentially from top to bottom with increasing diameters. The upper part of the inner support sleeve is connected to the support sleeve connection hole. The steel ring piston is located inside the steel ring piston hole. A return spring cavity is provided between the inner wall of the steel ring piston and the outer wall of the inner support sleeve. The return spring is located inside the return spring cavity, and its two ends abut against the steel ring piston and the inner support sleeve, respectively. A steel ring piston drive cavity is provided between the steel ring piston and the steel ring piston hole, and the bottom end of the steel ring piston is used to mate with the flange steel ring groove at the top of the wellhead cross-junction. The hydraulic assembly includes a locking valve disposed on the outer wall of the actuator body, the inlet of which is used to connect to an external hydraulic power source. The actuator body is provided with a first oil passage that communicates with the annular groove and the steel ring piston drive chamber respectively. One of the output ports of the locking valve is connected to the annular groove. The actuator body is provided with a second oil passage that communicates with the upper part of the locking piston hole and the support sleeve connection hole. The inner support sleeve is provided with a third oil passage that communicates with the second oil passage and the return spring chamber. The other output port of the locking valve is connected to the second oil passage.

[0007] Furthermore, the locking piston includes a piston base and a plurality of elastic claws evenly distributed in a ring at the bottom of the piston base; The piston base has a second through hole at its center. The pull rod passes through the second through hole and is located in multiple elastic claws. The lower end of the pull rod is provided with a conical head, which constitutes the external expansion mechanism. The large end of the conical head is located close to the piston base and abuts against the piston base under the elastic force of the claw spring. The lower inner wall of the elastic claw is provided with an inwardly inclined slope, and the lower outer wall is provided with a clamping step, which is located below the piston outlet. The conical head is used to engage with the inclined surface of the elastic claw, which expands the elastic claw radially outward, so that the clamping step is locked below the bolt hole of the wellhead cross-connector.

[0008] Furthermore, a first convex ring is provided on the top inner wall of the steel ring piston, and a second convex ring is provided on the bottom outer wall; a third convex ring is provided on the bottom outer wall of the inner support sleeve. The third convex ring abuts against the inner wall of the steel ring piston, the first convex ring abuts against the outer wall of the inner support sleeve, and the second convex ring abuts against the inner wall of the steel ring piston hole. The reset spring cavity is formed by the bottom of the first convex ring, the top of the third convex ring, the inner wall of the steel ring piston, and the outer wall of the inner support sleeve. The two ends of the return spring abut against the first convex ring and the third convex ring, respectively. The steel ring piston drive chamber is formed by the top of the second convex ring, the inner wall of the steel ring piston hole, and the outer wall of the steel ring piston.

[0009] Furthermore, the hydraulic assembly also includes a locking connector and a disengaging connector that are respectively connected to the two output ports of the lock-up valve via oil pipes; The locking connector is connected to the annular groove, and the disengaging connector is connected to the second oil passage.

[0010] Furthermore, it also includes a pressure ring; The pressure ring is an annular structure and is located at the top of the annular groove, thereby sealing the top of the annular groove.

[0011] Furthermore, the first through hole also includes a clamping piston hole disposed between the support sleeve connecting hole and the steel ring piston hole, and the diameters of the three increase sequentially from top to bottom; A pressing piston is provided inside the pressing piston hole, which is sleeved on the outer wall of the inner support sleeve and its lower end abuts against the upper end of the steel ring piston. An annular groove is provided on the upper part of the inner wall of the pressing piston, and the top of the pressing piston, the inner wall of the annular groove, the outer wall of the inner support sleeve, and the inner wall of the pressing piston hole together form the pressing piston cavity. The inner support sleeve is provided with a fourth oil passage, which is used to connect the compression piston chamber and the center hole of the inner support sleeve.

[0012] Furthermore, it also includes a clamping and lifting component: The clamping and lifting assembly includes a pin seat, a first pin, a second pin, a bracket body, a clamp, and a locking bolt. The pin seat is connected to one side of the bracket body. There are two clamps, which are set on the other side of the bracket body. Each clamp is locked by a locking bolt. The clamp located on the upper side is used to clamp the connection between the upper end of the blowout preventer and the ignition tube, and the clamp located on the lower side is used to clamp the connection between the lower end of the blowout preventer and the upper flange. The pin seat includes two oppositely arranged sub-pin seats. The first pin and the second pin are arranged between the two sub-pin seats, and the axes of the first pin and the second pin are perpendicular to the axis of the clamp. The first pin and the second pin are used to connect with the emergency rescue machine.

[0013] Meanwhile, the present invention also provides a wellhead reconstruction method, which employs the aforementioned bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device, ignition tube, blowout preventer, and external hydraulic power source. Its unique feature lies in the inclusion of the following steps: Step S1: Connect the ignition tube, blowout preventer, and bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device from top to bottom, and then connect the external hydraulic power source to the input port of the lock-up valve and the oil circuit of the blowout preventer respectively. Step S2: Place the bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device onto the wellhead cross-junction, and make each locking piston align with the corresponding bolt hole of the wellhead cross-junction, and the bottom end of the steel ring piston falls into the flange steel ring groove at the top of the wellhead cross-junction. Step S3: Oil is supplied to the first oil passage through one of the output ports of the lock-up valve. The oil entering the annular groove squeezes the connecting rod piston, causing it to drive the connecting rod, the pawl spring, and the locking piston to move downward. When the lower end of the locking piston passes through the bolt hole of the wellhead cross-connector, the locking piston is locked inside the piston outlet. The connecting rod continues to move downward against the elastic force of the pawl spring until the outer expansion mechanism at the lower end of the connecting rod opens the locking piston, thus connecting the locking piston with the bolt hole. At the same time, the oil entering the steel ring piston drive chamber squeezes the steel ring piston, and the steel ring piston overcomes the elastic force of the return spring and moves downward, so that the bottom end of the steel ring piston is pressed against the flange steel ring groove. Step S4: An external hydraulic power source supplies oil to the blowout preventer, thereby sealing the wellhead through the internal gate of the blowout preventer; Step S5: After the wellhead is sealed, well control operations are carried out, that is, the pressure inside the well is released through the blowout gate valve installed at one end of the wellhead cross-junction, or the well kill gate valve installed at the opposite end of the wellhead cross-junction is used to kill the well. Step S6: After the well control operation is completed, oil is supplied to the second oil passage through the lock-up valve. At the same time, the lock-up valve controls the return of oil to the first oil passage. After the oil enters the locking piston hole through the second oil passage, it pushes the pull rod piston to move upward, which drives the pull rod to move upward and reset. At the same time, the pawl spring resets by its own elasticity. As the external expansion mechanism resets upward, the locking piston returns to its original position, comes out of the bolt hole of the wellhead cross-connector, and moves upward to reset. Simultaneously, the oil flows through the second and third oil passages into the reset spring chamber. Under the elastic force of the reset spring and the action of the oil, the steel ring piston is pushed upward to reset. Then, the ignition tube, blowout preventer, and bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device are removed from the wellhead four-way position to complete the wellhead reconstruction.

[0014] Further, step S2 specifically involves: connecting the first and second pins of the clamping and lifting assembly to the emergency response machine, and using the upper clamping clamp in the clamping and lifting assembly to clamp the connection between the upper end of the blowout preventer and the ignition tube, and using the lower clamping clamp to clamp the connection between the lower end of the blowout preventer and the upper flange; then locking all the clamping clamps with locking bolts. By using the emergency repair machine and the clamping and lifting assembly, the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device is placed on the wellhead cross-junction, so that each locking piston is aligned with the corresponding bolt hole of the wellhead cross-junction, and the bottom end of the steel ring piston falls into the flange steel ring groove at the top of the wellhead cross-junction.

[0015] Further, step S3 specifically involves: supplying oil to the first oil passage through the lock-up valve; the oil entering the annular groove squeezes the pull rod piston, causing it to drive the pull rod, pawl spring, and locking piston downwards; when the lower end of the locking piston passes through the bolt hole of the wellhead cross-connector, the locking piston is locked inside the piston outlet; the pull rod continues to move downwards against the elastic force of the pawl spring; the conical head at the lower end of the pull rod moves downwards until it engages with the inclined surface of the elastic pawl, which pushes the multiple elastic pawls of the locking piston radially outwards, so that the locking step is locked below the bolt hole of the wellhead cross-connector, thus achieving the connection between the locking piston and the bolt hole; Simultaneously, the oil entering the steel ring piston drive chamber squeezes the steel ring piston, causing the steel ring piston to overcome the elastic force of the return spring and move downward, so that the bottom end of the steel ring piston abuts against the flange steel ring groove; the pressure inside the well enters the pressing piston chamber through the fourth oil passage, and under the action of pressure, the pressing piston moves downward to abut against the steel ring piston.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: (1) The present invention provides a bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device, which supplies oil to the first oil passage through one of the output ports of the locking valve. At this time, the oil entering the annular groove squeezes the pull rod piston, causing it to drive the pull rod, chuck spring and locking piston to move downward. When the lower end of the locking piston passes through the bolt hole of the wellhead cross-connector, the expansion mechanism located at the lower end of the pull rod opens the locking piston, realizing the connection between the locking piston and the bolt hole; at the same time, the oil entering the steel ring piston drive chamber squeezes the steel ring piston, and the steel ring piston overcomes the elastic force of the return spring and moves downward, so that the bottom end of the steel ring piston abuts against the flange steel ring groove. The present invention achieves sealing and rapid connection with the wellhead cross-connector by the locking piston moving down from above and cooperating with the bolt hole of the wellhead cross-connector, without contacting the outer edge surface of the flange on the wellhead cross-connector. After well control is completed, oil is supplied to the second oil passage through the other output port of the lock-up valve. After the oil enters the locking piston hole through the second oil passage, it pushes the pull rod piston upward, causing the pull rod to move upward and reset. At the same time, the pawl spring resets by its own elasticity. As the external expansion mechanism resets upward, the locking piston returns to its original position, disengages from the bolt hole of the wellhead cross passage, and moves upward to reset. Meanwhile, the oil enters the reset spring chamber through the second and third oil passages in sequence. Under the elasticity of the reset spring and the action of the oil, it pushes the steel ring piston upward to reset.

[0017] (2) The bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device provided by the present invention adopts the clamping connection method of elastic claws passing through the bolt holes of the wellhead four-way connector and expanding outward. The extension, expansion and retraction of each elastic claw are all hydraulically driven. Each hydraulic chamber is connected internally, reducing exposed pipelines and avoiding the problem of damage caused by too many exposed pipelines.

[0018] (3) The bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device provided by the present invention is equipped with a pressing piston and a fourth oil passage connecting the center hole of the inner support sleeve and the pressing piston chamber. With the help of the well pressure, the pressing piston presses the steel ring piston. The greater the well pressure, the better the pressing effect, thus avoiding the sealing failure at the flange steel ring groove of the wellhead large cross.

[0019] (4) The bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device provided by the present invention is equipped with a clamping and lifting component, which facilitates quick connection with the emergency rescue machine in the event of a blowout and on-site construction operations. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 2 for Figure 1 AA section view; Figure 3This is a schematic diagram of the structure of the first and second oil passages in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the second oil passage in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 5 This is a schematic diagram of the hydraulic components in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 6 This is a schematic diagram of the structure of the first and second oil passages in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the piston hole structure in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 8 This is a schematic diagram of the locking piston structure in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 9 This is a top view of the clamping and lifting assembly in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 10 This is a schematic diagram of the clamping and lifting assembly in use in an embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention; Figure 11 This is a schematic diagram of the embodiment of the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device of the present invention when it is used with the wellhead cross-connector; Figure 12 This is a schematic diagram showing the completion of step S3 in an embodiment of the wellhead reconstruction method of the present invention.

[0021] The annotations in the attached figures are explained as follows: 01-Ignition tube, 02-Blowout preventer, 03-External hydraulic power source, 04-Wellhead cross-connector, 05-Bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device, 06-Blowout gate valve, 07-Well kill gate valve; 1-Upper flange; 2-Actuator body, 21-Annular groove, 22-Pressure ring, 23-Piston hole, 231-Pull rod piston hole, 232-Locking piston hole, 233-Piston outlet, 24-First oil passage, 25-Second oil passage; 3-Claw assembly, 31-Claw spring, 32-Pull rod, 321-Conical head; 33-Pull rod piston, 34-Locking piston, 341-Piston base, 342-Elastic claw, 343-Clamping step; 4-Support assembly, 41-Inner support sleeve, 411-Third oil passage, 412-Third convex ring, 413-Fourth oil passage; 42-Reset spring, 43-Steel ring piston, 431-First convex ring, 432-Second convex ring; 44-Reset spring cavity, 45-Steel ring piston drive cavity, 46-Pressure piston, 47-Pressure piston cavity; 5-Hydraulic components, 51-Lock-off valve, 52-Locking connector, 53-Disengagement connector; 6-Clamping and lifting assembly, 61-Pin seat, 62-First pin, 63-Second pin, 64-Bracket body, 65-Clamping clamp, 66-Locking bolt. Detailed Implementation

[0022] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] like Figures 1-11 As shown, this embodiment provides a bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device 05, including an upper flange 1, an actuator body 2, a chuck assembly 3, a support assembly 4, and a hydraulic assembly 5.

[0024] The structure of the actuator body 2 is as follows Figure 1 As shown, a first through hole is provided in the center along the axial direction. The upper flange 1 is connected to the top of the actuator body 2 by a thread, and a flange center hole is provided in the center corresponding to the first through hole. The upper flange 1 is used to connect with the connection flange of the blowout preventer 02 by bolts.

[0025] An annular groove 21 is formed around the first through hole on the upper surface of the actuator body 2, and the top of the groove is closed. To facilitate processing, a ring-shaped pressure ring 22 is provided at the top of the annular groove 21. This pressure ring 22 is installed at the top of the annular groove 21 with screws, thus sealing the annular groove 21. Multiple piston holes 23 are axially and evenly distributed circumferentially at the bottom of the annular groove 21. Multiple claw assemblies 3 are provided, each corresponding to one of the piston holes 23. The position and number of the piston holes 23 correspond one-to-one with the position and number of bolt holes on the wellhead cross-connector 04.

[0026] The structure of piston bore 23 is as follows Figure 7 As shown, it includes a pull rod piston hole 231, a locking piston hole 232 and a piston outlet 233 arranged sequentially from top to bottom with decreasing diameters, thus forming a limiting step between adjacent ones.

[0027] The chuck assembly 3 includes a pull rod 32, a chuck spring 31 sleeved on the pull rod 32, and a pull rod piston 33 and a locking piston 34 slidably disposed in the pull rod piston hole 231 and locking piston hole 232, respectively. The lower end of the locking piston 34 extends out of the piston outlet 233. The upper and lower ends of the pull rod 32 are connected to the pull rod piston 33 and the locking piston 34, respectively, and the lower end can slide into the locking piston 34. The upper end of the pull rod 32 is threaded, and after the upper end of the pull rod 32 passes through the pull rod piston 33, the pull rod 32 is connected to the pull rod piston 33 by a nut. The two ends of the chuck spring 31 abut against the pull rod piston 33 and the locking piston 34, respectively. The limiting step of the piston hole 23 can limit the movement of the pull rod piston 33 and the locking piston 34.

[0028] The lower end of the pull rod 32 is provided with an external expansion mechanism. This mechanism is used to expand the locking piston 34 after its lower end passes through the bolt hole of the wellhead cross-connector 04, thus connecting the locking piston 34 to the bolt hole. In this embodiment, the structure of the locking piston 34 is as follows: Figure 8 As shown, the device includes a piston base 341 and a plurality of elastic claws 342 evenly distributed in a ring at the bottom of the piston base 341. A second through hole is provided in the center of the piston base 341. The pull rod 32 passes through the second through hole and is located within the plurality of elastic claws 342. A conical head 321 is provided at the lower end of the pull rod 32. The conical head 321 constitutes the external expansion mechanism. The large end of the conical head 321 is located close to the piston base 341 and abuts against the piston base 341 under the elastic force of the claw spring 31. The lower inner wall of the elastic claw 342 is provided with an inwardly inclined slope, and the lower outer wall is provided with a clamping step 343, which is located below the piston outlet 233.

[0029] When connected to the wellhead cross-connector 04, the conical head 321 is used to engage with the inclined surface of the elastic claw 342, which expands the elastic claw 342 radially outward, so that the clamping step 343 is clamped below the bolt hole of the wellhead cross-connector 04, preventing the entire device from accidentally falling off. This embodiment adopts this outward expansion clamping connection method, which has a simple structure and a low failure rate.

[0030] The support assembly 4 includes a hollow inner support sleeve 41 and a return spring 42 and a steel ring piston 43, which are sequentially fitted onto the inner support sleeve 41 from the inside out. The first through hole includes a support sleeve connecting hole and a steel ring piston hole arranged sequentially from top to bottom with increasing diameters. The upper part of the inner support sleeve 41 is threadedly connected to the support sleeve connecting hole. The steel ring piston 43 is located inside the steel ring piston hole. A return spring cavity 44 is provided between the inner wall of the steel ring piston 43 and the outer wall of the inner support sleeve 41. The return spring 42 is located inside the return spring cavity 44, and its two ends abut against the steel ring piston 43 and the inner support sleeve 41, respectively. In this embodiment, a first convex ring 431 is provided on the top inner wall of the steel ring piston 43, a second convex ring 432 is provided on the bottom outer wall, and a third convex ring 412 is provided on the bottom outer wall of the inner support sleeve 41. The third convex ring 412 abuts against the inner wall of the steel ring piston 43, the first convex ring 431 abuts against the outer wall of the inner support sleeve 41, the second convex ring 432 abuts against the inner wall of the steel ring piston hole, and the return spring cavity 44 is formed by the bottom of the first convex ring 431, the top of the third convex ring 412, the inner wall of the steel ring piston 43 and the outer wall of the inner support sleeve 41. The two ends of the return spring 42 abut against the first convex ring 431 and the third convex ring 412 respectively.

[0031] A steel ring piston drive chamber 45 is provided between the steel ring piston 43 and the steel ring piston hole. The bottom end of the steel ring piston 43 is used to mate with the flange steel ring groove on the top of the wellhead cross-connector 04, which serves to isolate and seal the external annulus from the internal well fluid. In this embodiment, the steel ring piston drive chamber 45 is formed by the top of the second convex ring 432, the inner wall of the steel ring piston hole, and the outer wall of the steel ring piston 43.

[0032] Hydraulic component 5 structure as follows Figure 5 and Figure 12 As shown, it includes a locking valve 51 installed on the outer wall of the actuator body 2, and a locking connector 52 and a disengaging connector 53 connected to the two output ports of the locking valve 51 respectively through oil pipes. The input port of the locking valve 51 is connected to an external hydraulic power source 03.

[0033] like Figures 2-4 , Figure 6 As shown, the actuator body 2 is provided with a first oil passage 24 that communicates with the annular groove 21 and the steel ring piston drive chamber 45 respectively. One of the output ports of the locking valve 51 is connected to the annular groove 21 through a locking connector 52. At the same time, a second oil passage 25 is provided on the actuator body 2 that communicates with the upper part of the locking piston hole 232 and the support sleeve connection hole, while a third oil passage 411 is provided on the inner support sleeve 41 that communicates with the second oil passage 25 and the return spring chamber 44. The other output port of the locking valve 51 is connected to the second oil passage 25 through a disconnecting connector 53.

[0034] When it needs to be connected to the wellhead cross-connector 04, the locking valve 51 supplies oil to the first oil passage 24 through the locking connector 52. The oil entering the annular groove 21 squeezes the pull rod piston 33, causing it to drive the pull rod 32, the pawl spring 31, and the locking piston 34 downwards. When the lower end of the locking piston 34 passes through the bolt hole of the wellhead cross-connector 04, as... Figure 11 As shown, the expansion mechanism located at the lower end of the pull rod 32 expands the locking piston 34, enabling the locking piston 34 to connect with the bolt hole. At the same time, the oil entering the steel ring piston drive chamber 45 squeezes the steel ring piston 43, causing the steel ring piston 43 to overcome the elastic force of the return spring 42 and move downward, so that the bottom end of the steel ring piston 43 abuts against the flange steel ring groove.

[0035] If it is necessary to disengage from the wellhead cross-connector 04, the locking valve 51 supplies oil to the second oil passage 25 through the disconnecting connector 53. After the oil enters the locking piston hole 232 through the second oil passage 25, it pushes the pull rod piston 33 upward, causing the pull rod 32 to move upward and reset. At the same time, the pawl spring 31 resets due to its own elasticity. As the external expansion mechanism resets upward, the locking piston 34 returns to its original position, disengages from the bolt hole of the wellhead cross-connector 04, and moves upward to reset. Meanwhile, the oil sequentially enters the reset spring chamber 44 through the second oil passage 25 and the third oil passage 411. Under the elasticity of the reset spring 42 and the action of the oil, it pushes the steel ring piston 43 upward to reset.

[0036] In this embodiment, in order to ensure that the steel ring piston 43 and the flange steel ring groove can be tightly abutted, the first through hole also includes a pressing piston hole provided between the support sleeve connecting hole and the steel ring piston hole. The diameters of the three increase from top to bottom. A pressing piston 46 is provided in the pressing piston hole, which is sleeved on the outer wall of the inner support sleeve 41 and its lower end abuts against the upper end of the steel ring piston 43.

[0037] In order to use the pressure inside the well to press the steel ring piston 43, such as Figure 3 As shown, an annular groove is formed on the upper part of the inner wall of the clamping piston 46. The top of the clamping piston 46, the inner wall of the annular groove, the outer wall of the inner support sleeve 41, and the inner wall of the clamping piston hole together form the clamping piston cavity 47. A fourth oil passage 413 is provided on the inner support sleeve 41, which connects the clamping piston cavity 47 and the central hole of the inner support sleeve 41. Thus, during well control operations, the well pressure enters the clamping piston cavity 47 from the central hole of the inner support sleeve 41 through the fourth oil passage 413. Under the action of pressure, the clamping piston 46 moves downward, squeezing the steel ring piston 43 so that its bottom end is tightly abutted against the flange steel ring groove. The greater the well pressure, the tighter the abutment.

[0038] To facilitate handling in the event of a blowout, a clamping and lifting assembly 6 is also provided, the structure of which is as follows: Figure 9 , Figure 10As shown, the clamping and lifting assembly 6 includes a pin seat 61, a first pin 62, a second pin 63, a bracket body 64, clamping clips 65, and locking bolts 66. The pin seat 61 is connected to one side of the bracket body 64. There are two clamping clips 65, one above the other on the other side of the bracket body 64, and each clamping clip 65 is locked by the locking bolts 66. The upper clamping clip 65 is used to clamp the connection between the upper end of the blowout preventer 02 and the ignition tube 01, and the lower clamping clip 65 is used to clamp the connection between the lower end of the blowout preventer 02 and the upper flange 1. The pin seat 61 includes two opposing sub-pin seats. The first pin 62 and the second pin 63 are located between the two sub-pin seats, and the axes of the first pin 62 and the second pin 63 are perpendicular to the axis of the clamping clip 65. The first pin 62 and the second pin 63 are used to connect with the emergency response machine.

[0039] This embodiment also provides a wellhead reconstruction method, employing the aforementioned bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device 05, ignition tube 01, blowout preventer 02, and external hydraulic power source 03. The ignition tube 01 serves as a guide, directing the well fluid or flame outwards to ensure that the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device 05 of this invention does not experience pressure buildup or upward thrust when installed in place.

[0040] The method of the present invention includes the following steps: Step S1: Connect the ignition tube 01, blowout preventer 02, and bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device 05 from top to bottom, and then connect the external hydraulic power source 03 to the input port of the lock-up valve 51 and the oil circuit of the blowout preventer 02 respectively. Step S2: Place the bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device 05 onto the wellhead cross-junction 04, and make each locking piston 34 align with the corresponding bolt hole of the wellhead cross-junction 04, and the bottom end of the steel ring piston 43 falls into the flange steel ring groove at the top of the wellhead cross-junction 04. Step S2 specifically involves: connecting the first pin 62 and the second pin 63 of the clamping and lifting assembly 6 to the emergency response machine, and using the upper clamping clamp 65 in the clamping and lifting assembly 6 to clamp the connection between the upper end of the blowout preventer 02 and the ignition tube 01, and using the lower clamping clamp 65 to clamp the connection between the lower end of the blowout preventer 02 and the upper flange 1; then locking all the clamping clamps 65 with the locking bolts 66. With the help of the emergency rescue machine and the clamping and lifting assembly 6, the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device 05 is placed on the wellhead cross-junction 04, so that each locking piston 34 is aligned with the corresponding bolt hole of the wellhead cross-junction 04, and the bottom end of the steel ring piston 43 falls into the flange steel ring groove at the top of the wellhead cross-junction 04. Step S3: Oil is supplied to the first oil passage 24 through one of the output ports of the locking valve 51. The oil entering the annular groove 21 squeezes the pull rod piston 33, causing it to drive the pull rod 32, the claw spring 31 and the locking piston 34 to move downward. When the lower end of the locking piston 34 passes through the bolt hole of the wellhead cross-connector 04, the locking piston 34 is locked inside the piston outlet 233. The pull rod 32 continues to move downward against the elastic force of the claw spring 31 until the outer expansion mechanism at the lower end of the pull rod 32 opens the locking piston 34, realizing the connection between the locking piston 34 and the bolt hole. At the same time, the oil entering the steel ring piston drive chamber 45 squeezes the steel ring piston 43, and the steel ring piston 43 overcomes the elastic force of the return spring 42 and moves downward, so that the bottom end of the steel ring piston 43 abuts against the flange steel ring groove. Step S3 is as follows: oil is supplied to the first oil passage 24 through the lock-up valve 51. The oil entering the annular groove 21 squeezes the pull rod piston 33, causing it to drive the pull rod 32, the claw spring 31 and the locking piston 34 to move downward. When the lower end of the locking piston 34 passes through the bolt hole of the wellhead cross-connector 04, the locking piston 34 is locked inside the piston outlet 233. The pull rod 32 continues to move downward against the elastic force of the claw spring 31. The cone head 321 located at the lower end of the pull rod 32 moves downward until it cooperates with the inclined surface of the elastic claw 342, which pushes the multiple elastic claws 342 of the locking piston 34 radially outward, so that the locking step 343 is locked below the bolt hole of the wellhead cross-connector 04, realizing the connection between the locking piston 34 and the bolt hole. At the same time, the oil entering the steel ring piston drive chamber 45 squeezes the steel ring piston 43, and the steel ring piston 43 overcomes the elastic force of the return spring 42 and moves downward, so that the bottom end of the steel ring piston 43 abuts against the flange steel ring groove; the pressure in the well enters the pressing piston chamber 47 through the fourth oil passage 413, and under the action of pressure, the pressing piston 46 moves downward to press against the steel ring piston 43. A diagram showing the result after step S3 is completed is shown below. Figure 12 As shown; Step S4: The external hydraulic power source 03 supplies oil to the blowout preventer 02, thereby sealing the wellhead through the internal gate of the blowout preventer 02; Step S5: After the wellhead is sealed, well control operations are carried out, that is, the pressure inside the well is released through the blowout gate valve 06 installed at one end of the wellhead cross-junction 04, or the well control gate valve 07 installed on the opposite end of the wellhead cross-junction 04 is used to control the well. Step S6: After the well control operation is completed, oil is supplied to the second oil passage 25 through the lock-up valve 51. At the same time, the lock-up valve 51 controls the return of oil to the first oil passage 24. After the oil enters the locking piston hole 232 through the second oil passage 25, it pushes the pull rod piston 33 to move upward, which drives the pull rod 32 to move upward and reset. At the same time, the pawl spring 31 resets by its own elasticity. As the external expansion mechanism resets upward, the locking piston 34 returns to its original position, comes out of the bolt hole of the wellhead cross-connector 04 and moves upward to reset. Simultaneously, the oil flows sequentially through the second oil passage 25 and the third oil passage 411 into the reset spring chamber 44. Under the elastic force of the reset spring 42 and the action of the oil, the steel ring piston 43 is pushed upward to reset. Subsequently, the ignition tube 01, blowout preventer 02, and bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device 05 are removed from the wellhead cross-connector 04 position to complete the wellhead reconstruction.

[0041] When removing the ignition tube 01, blowout preventer 02, and bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device 05, the emergency rescue machine and clamping and lifting assembly 6 can still be used to complete the task.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device, characterized in that: It includes an upper flange (1), an actuator body (2), a claw assembly (3), a support assembly (4), and a hydraulic assembly (5); The actuator body (2) has a first through hole axially through its center. The upper flange (1) is used to connect with the blowout preventer (02). The upper flange (1) is connected to the top of the actuator body (2), and a flange center hole is opened in the center corresponding to the first through hole. The upper surface of the actuator body (2) has an annular groove (21) around the first through hole. The top of the groove is closed, and the bottom of the groove has multiple piston holes (23) evenly distributed circumferentially through it. The claw assembly (3) has multiple claws and is respectively arranged in the piston holes (23). The piston holes (23) include a tie rod piston hole (231), a locking piston hole (232), and a piston outlet (233) arranged sequentially from top to bottom with decreasing diameters. The claw assembly (3) includes a pull rod (32), a claw spring (31) sleeved on the pull rod (32), and a pull rod piston (33) and a locking piston (34) respectively slidably disposed in the pull rod piston hole (231) and the locking piston hole (232). The lower end of the locking piston (34) extends out of the piston outlet (233). The upper end of the pull rod (32) is connected to the pull rod piston (33), and the lower end of the pull rod (32) is connected to the locking piston (34). 4) Connected and slidably inserted into the locking piston (34), the two ends of the claw spring (31) abut against the pull rod piston (33) and the locking piston (34) respectively; the lower end of the pull rod (32) is provided with an external expansion mechanism, which is used to open the locking piston (34) after the lower end of the locking piston (34) passes through the bolt hole of the wellhead cross-connector (04) when it is connected to the wellhead cross-connector (04), so as to realize the connection between the locking piston (34) and the bolt hole; The support assembly (4) includes a hollow inner support sleeve (41) and a return spring (42) and a steel ring piston (43) sequentially sleeved on the inner support sleeve (41) from the inside to the outside. The first through hole includes a support sleeve connection hole and a steel ring piston hole arranged sequentially from top to bottom with increasing diameter. The upper part of the inner support sleeve (41) is connected to the support sleeve connection hole. The steel ring piston (43) is located in the steel ring piston hole. A return spring cavity (44) is provided between the inner wall of the steel ring piston (43) and the outer wall of the inner support sleeve (41). The return spring (42) is located in the return spring cavity (44). The two ends of the return spring (42) abut against the steel ring piston (43) and the inner support sleeve (41) respectively. A steel ring piston drive cavity (45) is provided between the steel ring piston (43) and the steel ring piston hole. The bottom end of the steel ring piston (43) is used to cooperate with the flange steel ring groove at the top of the wellhead cross-connector (04). The hydraulic assembly (5) includes a locking valve (51) installed on the outer wall of the actuator body (2), the inlet of which is used to connect to an external hydraulic power source (03). The actuator body (2) is provided with a first oil passage (24) that is connected to the annular groove (21) and the steel ring piston drive chamber (45) respectively. One of the output ports of the locking valve (51) is connected to the annular groove (21). The actuator body (2) is provided with a second oil passage (25) that connects the upper part of the locking piston hole (232) and the support sleeve connection hole. The inner support sleeve (41) is provided with a third oil passage (411) that connects the second oil passage (25) and the reset spring chamber (44). The other output port of the locking valve (51) is connected to the second oil passage (25).

2. The bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device according to claim 1, characterized in that: The locking piston (34) includes a piston base (341) and a plurality of elastic claws (342) arranged in a ring at the bottom of the piston base (341). The piston base (341) has a second through hole in the center. The pull rod (32) passes through the second through hole and is located in multiple elastic claws (342). The lower end of the pull rod (32) is provided with a conical head (321). The conical head (321) constitutes the external expansion mechanism. The large end of the conical head (321) is located close to the piston base (341) and abuts against the piston base (341) under the elastic force of the claw spring (31). The lower inner wall of the elastic claw (342) is provided with an inwardly inclined slope, and the lower outer wall is provided with a clamping step (343). The clamping step (343) is located on the lower side of the piston outlet (233). The conical head (321) is used to engage with the inclined surface of the elastic claw (342) to push the elastic claw (342) outward in a radial direction, so that the clamping step (343) is clamped below the bolt hole of the wellhead cross-connector (04).

3. The bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device according to claim 2, characterized in that: The steel ring piston (43) has a first convex ring (431) on its top inner wall and a second convex ring (432) on its bottom outer wall; the inner support sleeve (41) has a third convex ring (412) on its bottom outer wall. The third convex ring (412) abuts against the inner wall of the steel ring piston (43), the first convex ring (431) abuts against the outer wall of the inner support sleeve (41), and the second convex ring (432) abuts against the inner wall of the steel ring piston hole. The reset spring cavity (44) is formed by the bottom of the first convex ring (431), the top of the third convex ring (412), the inner wall of the steel ring piston (43), and the outer wall of the inner support sleeve (41). The two ends of the return spring (42) abut against the first convex ring (431) and the third convex ring (412) respectively; The steel ring piston drive chamber (45) is formed by the top of the second convex ring (432), the inner wall of the steel ring piston hole, and the outer wall of the steel ring piston (43).

4. The bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device according to claim 3, characterized in that: The hydraulic assembly (5) also includes a locking connector (52) and a disengaging connector (53), which are respectively connected to the two output ports of the locking valve (51) via oil pipes; The locking connector (52) is connected to the annular groove (21), and the disengaging connector (53) is connected to the second oil passage (25).

5. The bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device according to any one of claims 1-4, characterized in that: It also includes a pressure ring (22); The pressure ring (22) is an annular structure and is located at the top of the annular groove (21). The pressure ring (22) seals the top of the annular groove (21).

6. The bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device according to claim 4, characterized in that: The first through hole also includes a clamping piston hole disposed between the support sleeve connecting hole and the steel ring piston hole, and the diameters of the three increase sequentially from top to bottom; A pressing piston (46) is provided in the pressing piston hole, which is sleeved on the outer wall of the inner support sleeve (41) and its lower end abuts against the upper end of the steel ring piston (43). An annular groove is provided on the upper part of the inner wall of the pressing piston (46), and the top of the pressing piston (46), the inner wall of the annular groove, the outer wall of the inner support sleeve (41) and the inner wall of the pressing piston hole together form the pressing piston cavity (47). The inner support sleeve (41) is provided with a fourth oil passage (413), which is used to connect the compression piston chamber (47) and the center hole of the inner support sleeve (41).

7. The bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device according to claim 5, characterized in that: It also includes a clamping and lifting component (6); The clamping and lifting assembly (6) includes a pin seat (61), a first pin (62), a second pin (63), a bracket body (64), a clamp (65), and a locking bolt (66). The pin seat (61) is connected to one side of the bracket body (64). There are two clamps (65), which are set on the other side of the bracket body (64). Each clamp (65) is locked by a locking bolt (66). The clamp (65) located above is used to clamp the connection position between the upper end of the blowout preventer (02) and the ignition tube (01). The clamp (65) located below is used to clamp the connection position between the lower end of the blowout preventer (02) and the upper flange (1). The pin seat (61) includes two oppositely arranged sub-pin seats. The first pin (62) and the second pin (63) are arranged between the two sub-pin seats. The axes of the first pin (62) and the second pin (63) are perpendicular to the axis of the clamp (65). The first pin (62) and the second pin (63) are used to connect with the emergency rescue machine.

8. A wellhead reconstruction method, employing the bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device (05) as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Connect the ignition tube (01), blowout preventer (02) and bolt hole claw insertion hydraulic annular rapid wellhead reconstruction device (05) from top to bottom, and then connect the external hydraulic power source (03) to the input port of the lock-up valve (51) and the oil circuit of the blowout preventer (02) respectively. Step S2: Place the bolt hole chuck insertion type hydraulic annular rapid wellhead reconstruction device (05) on the wellhead cross-connector (04), and make each locking piston (34) align with the corresponding bolt hole of the wellhead cross-connector (04), and the bottom end of the steel ring piston (43) falls into the flange steel ring groove at the top of the wellhead cross-connector (04); Step S3: Oil is supplied to the first oil passage (24) through one of the output ports of the lock-up valve (51). The oil entering the annular groove (21) squeezes the pull rod piston (33), causing it to drive the pull rod (32), the claw spring (31) and the locking piston (34) to move downward. When the lower end of the locking piston (34) passes through the bolt hole of the wellhead cross-connector (04), the locking piston (34) is stuck inside the piston outlet (233). The pull rod (32) continues to move downward against the elastic force of the claw spring (31) until the outer expansion mechanism at the lower end of the pull rod (32) opens the locking piston (34), realizing the connection between the locking piston (34) and the bolt hole. At the same time, the oil entering the steel ring piston drive chamber (45) squeezes the steel ring piston (43), and the steel ring piston (43) overcomes the elastic force of the return spring (42) and moves downward, so that the bottom end of the steel ring piston (43) abuts against the flange steel ring groove. Step S4: The external hydraulic power source (03) supplies oil to the blowout preventer (02), thereby sealing the wellhead through the internal gate of the blowout preventer (02); Step S5: After the wellhead is sealed, well control operations are carried out, that is, the pressure inside the well is released by the blowout gate valve (06) installed at one end of the wellhead cross-junction (04), or the well is controlled by the kill gate valve (07) installed at the other end of the wellhead cross-junction (04). Step S6: After the well control operation is completed, oil is supplied to the second oil passage (25) through the lock-up valve (51). At the same time, the lock-up valve (51) controls the return of oil to the first oil passage (24). After the oil enters the locking piston hole (232) through the second oil passage (25), it pushes the pull rod piston (33) to move upward, which drives the pull rod (32) to move upward and reset. At the same time, the claw spring (31) resets through its own elasticity. As the external expansion mechanism resets upward, the locking piston (34) returns to its original position, comes out of the bolt hole of the wellhead cross-connector (04), and moves upward to reset. At the same time, the oil flows through the second oil passage (25) and the third oil passage (411) into the reset spring chamber (44). Under the elastic force of the reset spring (42) and the action of the oil, the steel ring piston (43) is pushed upward to reset. Then, the ignition tube (01), blowout preventer (02) and bolt hole claw insertion hydraulic annular rapid wellhead reconstruction device (05) are removed from the wellhead cross passage (04) position to complete the wellhead reconstruction.

9. The wellhead reconstruction method according to claim 8, characterized in that: Step S2 specifically involves connecting the first pin (62) and the second pin (63) of the clamping and lifting assembly (6) to the emergency response machine, and using the clamping clamp (65) located at the top of the clamping and lifting assembly (6) to clamp the connection between the upper end of the blowout preventer (02) and the ignition tube (01), and using the clamping clamp (65) located at the bottom to clamp the connection between the lower end of the blowout preventer (02) and the upper flange (1); then locking all the clamping clamps (65) with the locking bolts (66). With the help of the emergency rescue machine and the clamping and lifting assembly (6), the bolt hole claw insertion type hydraulic annular rapid wellhead reconstruction device (05) is placed on the wellhead cross-connector (04), so that each locking piston (34) is aligned with the corresponding bolt hole of the wellhead cross-connector (04), and the bottom end of the steel ring piston (43) falls into the flange steel ring groove at the top of the wellhead cross-connector (04).

10. The wellhead reconstruction method according to claim 9, characterized in that: Step S3 is as follows: oil is supplied to the first oil passage (24) through the lock-up valve (51). The oil entering the annular groove (21) squeezes the pull rod piston (33), causing it to drive the pull rod (32), the claw spring (31) and the locking piston (34) to move downward. When the lower end of the locking piston (34) passes through the bolt hole of the wellhead cross-connector (04), the locking piston (34) is locked inside the piston outlet (233). The pull rod (32) continues to move downward against the elastic force of the claw spring (31). The cone head (321) at the lower end of the pull rod (32) moves downward until it engages with the inclined surface of the elastic claw (342), which pushes the multiple elastic claws (342) of the locking piston (34) radially outward, so that the locking step (343) is locked below the bolt hole of the wellhead cross-connector (04), thus realizing the connection between the locking piston (34) and the bolt hole. At the same time, the oil entering the steel ring piston drive chamber (45) squeezes the steel ring piston (43), and the steel ring piston (43) moves downward against the elastic force of the return spring (42), so that the bottom end of the steel ring piston (43) abuts against the flange steel ring groove; the pressure in the well enters the pressing piston chamber (47) through the fourth oil passage (413), and under the action of pressure, the pressing piston (46) moves downward to abut against the steel ring piston (43).

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