A coiled tubing well control apparatus connection device and method of use thereof

Abstract

The application discloses a continuous pipe well control equipment connecting device and a use method thereof, wherein the device comprises an upper connecting head, a guide component, a lower connecting head, a hydraulic lock assembly and a state indicating component; the upper connecting head comprises an upper head body, the upper head body is provided with a first accommodating hole in the axial direction, the guide component is arranged at the upper end of the lower connecting head, the lower connecting head comprises a lower head body, the lower head body is provided with a second accommodating hole matched with the lower end of the upper head body in the axial direction, one end of the hydraulic lock assembly is connected with the lower head body, and the state indicating component is arranged at the other end of the hydraulic lock assembly. The state indicating component of the application can remotely judge that the connecting device is in a locked connection or a detachable disconnection state, can be used for high-altitude remote quick connection between well control devices during operation, and reduces the risk of close installation and disassembly operation of an operator during the installation and connection process.

Description

Technical Field

[0001] This invention belongs to the field of petroleum equipment technology, and specifically relates to a connection device for continuous tubing well control equipment and its usage method. Background Technology

[0002] During coiled tubing operations, to control wellhead pressure as required by well control standards, it is typically necessary to install and connect coiled tubing well control equipment such as blowout preventers (BOPs), blowout preventers tubing, and blowout preventers below the injection head. Currently, the common practice in China for coiled tubing operations is to manually install, connect, or disconnect the flanges or junctions between the coiled tubing injection head and well control equipment.

[0003] During installation, connection, or disassembly, problems may arise such as difficulty in aligning the connection holes of the joints, low connection reliability, and easy damage to the connection parts due to repeated installation and disassembly. This installation and disassembly method greatly increases the labor intensity of operators and reduces work efficiency in continuous pipe operations.

[0004] Currently, coiled tubing operation equipment and technology are moving towards automation and intelligence, aiming to improve the efficiency and safety of coiled tubing operations and reduce the labor intensity of operators. Well control equipment connection devices are used to solve the installation and disassembly problems between well control equipment in coiled tubing operations, and are a key link in improving the efficiency of coiled tubing operations.

[0005] Currently, the main connection devices for well control equipment in China are manual mechanical locking connections and hydraulic locking connections. Manual mechanical locking connections require operators to be nearby to connect or disconnect, resulting in low efficiency and operational safety. Hydraulic locking connections use full hydraulic control to separately control the connection locking and disconnection. Maintaining the hydraulic operating pressure during the locking state poses a safety risk if there are malfunctions in the hydraulic circuit or if the limit pressure cannot be maintained, potentially leading to unreliable connection locking. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a connection device and method for using coiled tubing well control equipment. This device enables the connection and disconnection of coiled tubing well control equipment via remote hydraulic control, solving the problem of rapid, high-altitude connection of well control equipment during coiled tubing operations. It also reduces the operational risks associated with operators manually installing and disassembling connection points below the suspended injection head, thereby improving operational efficiency and reducing labor intensity.

[0007] A connection device for a continuous tubing well control system includes an upper connector, a guide component, a lower connector, a hydraulic lock assembly, and a status indicator component. The upper connector includes an upper connector body with a first receiving hole along the axial direction. The guide component is located at the upper end of the lower connector. The lower connector includes a lower connector body with a second receiving hole along the axial direction that matches the lower end of the upper connector body. One end of the hydraulic lock assembly is connected to the lower connector body, and the status indicator component is located at the other end of the hydraulic lock assembly.

[0008] Furthermore, the upper connector also includes a first connector, a sealing part, and an elastic sealing ring;

[0009] The first connector is located at the upper end of the upper connector body, and the lower end of the upper connector body is provided with an annular first step portion. The sealing portion is located at the lower end of the first step portion, and the sealing portion is provided with a sealing groove along the circumferential direction. The elastic sealing ring is located in the sealing groove, and the outer diameter of the sealing portion is not greater than the outer diameter of the upper connector body. The diameter of the first receiving hole is matched with the through diameter of the upper well control equipment.

[0010] Furthermore, the guide component includes a tapered inlet, a transition section, and a mounting panel;

[0011] The tapered inlet portion has a tapered hole along the axial direction, the diameter of which gradually decreases from top to bottom along the axial direction. The lower end of the tapered inlet portion is connected to the mounting panel through the transition portion. The mounting panel is detachably connected to the lower connector body. The transition portion has a third receiving hole along the axial direction. The diameter of the lower end of the tapered hole and the diameter of the third receiving hole are both not less than the outer diameter of the first step portion.

[0012] Furthermore, the lower connector also includes a second connector, which is disposed at the lower end of the lower connector body.

[0013] Furthermore, the second receiving hole includes a first circular hole, a second circular hole, and a third circular hole concentrically arranged from top to bottom along the axial direction;

[0014] Wherein, the diameter of the first circular hole is not less than the outer diameter of the first stepped portion, the diameter of the second circular hole is matched with the diameter of the sealing portion, the connection between the first circular hole and the second circular hole forms a second stepped portion, when the lower end of the first stepped portion abuts against the upper end of the second stepped portion, the upper connector is restricted from continuing to move downward, and the outer diameter of the third circular hole is matched with the through diameter of the lower well control equipment.

[0015] Furthermore, multiple hydraulic lock assemblies are provided, and the multiple hydraulic lock assemblies are evenly distributed around the lower connector body. The lower connector body is provided with a locking groove at the middle position of the first circular hole. The number of the status indicator component and the number of the locking groove are provided in a one-to-one correspondence with the number of hydraulic lock assemblies. The multiple locking grooves are evenly distributed around the concentric circles of the first circular hole.

[0016] Furthermore, the hydraulic lock assembly includes a flange, cylinder liner, piston, locking block, return spring, and end cap;

[0017] The flange is located at the first end of the cylinder liner, the end cap is located at the second end of the cylinder liner, and the end cap has a second through hole. The locking block is located in the locking groove. The first end of the piston passes through the flange and is connected to the locking block. The second end of the piston is slidably connected to the second through hole. A slide is located in the middle of the piston and is slidably connected to the inner wall of the cylinder liner. A return spring is fitted on the piston, with one end fixedly connected to the slide and the other end fixedly connected to the end cap. The cylinder liner has a lock-out oil supply port and a lock-in oil supply port on both sides of the slide. The lock-out oil supply port is closer to the first end of the piston, and the lock-in oil supply port is closer to the second end of the piston.

[0018] Furthermore, it also includes a hydraulic circuit assembly, which includes a first cylinder connector, a second cylinder connector, a first tee connector, a second tee connector, a third tee connector, a fourth tee connector, a fifth tee connector, a sixth tee connector, a first hydraulic line, a second hydraulic line, a third hydraulic line, a fourth hydraulic line, a fifth hydraulic line, a sixth hydraulic line, a first quick connector and a second quick connector, and multiple hydraulic lock assemblies including a first hydraulic lock assembly, a second hydraulic lock assembly, a third hydraulic lock assembly and a fourth hydraulic lock assembly;

[0019] Wherein, the lock release oil supply port and the lock supply port of the first hydraulic lock assembly are respectively connected to the first end of the first cylinder connector and the first end of the second cylinder connector; the lock release oil supply port and the lock supply port of the second hydraulic lock assembly are respectively connected to the first end of the first tee connector and the first end of the second tee connector; the lock release oil supply port and the lock supply port of the third hydraulic lock assembly are respectively connected to the first end of the third tee connector and the first end of the fourth tee connector; and the lock release oil supply port and the lock supply port of the fourth hydraulic lock assembly are respectively connected to the first end of the fifth tee connector and the first end of the sixth tee connector.

[0020] One end of the first hydraulic line is connected to the second end of the first cylinder connector, and the other end is connected to the second end of the first tee connector; one end of the second hydraulic line is connected to the third end of the first tee connector, and the other end is connected to the second end of the third tee connector; one end of the third hydraulic line is connected to the third end of the third tee connector, and the other end is connected to the second end of the fifth tee connector, and the third end of the fifth tee connector is connected to the first quick connector.

[0021] One end of the fourth hydraulic line is connected to the second end of the second cylinder connector, and the other end is connected to the second end of the second tee connector; one end of the fifth hydraulic line is connected to the third end of the second tee connector, and the other end is connected to the second end of the fourth tee connector; one end of the sixth hydraulic line is connected to the third end of the fourth tee connector, and the other end is connected to the second end of the sixth tee connector, and the third end of the sixth tee connector is connected to the second quick connector.

[0022] Furthermore, the status indication component includes a fixed plate, a hinge, and an indicator plate;

[0023] The fixing plate is fixed to the end cover, and the indicator plate is movably connected to the fixing plate through the hinge. When the second end of the piston extends out of the second through hole, the indicator plate is pushed to a horizontal position. When the second end of the piston retracts into the second through hole, the indicator plate is attached to the end cover.

[0024] Furthermore, the locking block is arc-shaped, including a first arc surface and a second arc surface;

[0025] The first arc surface is provided with a T-shaped keyway, and each locking block is connected to the first end of the piston through the T-shaped keyway. The radius of the second arc surface is matched with the radius of the upper connector body.

[0026] The present invention also provides a method for using a coiled tubing well control equipment connection device, the connection device comprising an upper connector, a guide component, a lower connector, a hydraulic lock assembly, and a status indicator component, wherein:

[0027] The guide component guides the lower end of the upper connector body of the upper connector to be inserted into the second receiving hole of the lower connector, wherein the second receiving hole is arranged along the axial direction of the lower connector body of the lower connector;

[0028] The lower end of the upper connector body is locked or released by the hydraulic lock assembly, wherein one end of the hydraulic lock assembly is connected to the lower connector body; and a status indicator component is located at the other end of the hydraulic lock assembly.

[0029] The status of the hydraulic lock assembly is determined by setting a status indicator component. If the hydraulic lock assembly clamps and locks the lower end of the upper connector body, the status indicator component indicates that the connecting device is in a locked state; if the hydraulic lock assembly loosens the lower end of the upper connector body, the status indicator component indicates that the connecting device is in a disengaged state. The status indicator component is located at the other end of the hydraulic lock assembly.

[0030] Furthermore, it also includes the following steps:

[0031] Connect the upper end of the upper connector to the lower end of the upper well control device, and connect the lower end of the lower connector to the upper end of the lower well control device.

[0032] When the upper and lower well control devices are disconnected and need to be connected, the status of the hydraulic lock assembly is determined by the status indicator component. If the hydraulic lock assembly is in the loose state, the guide component guides the lower end of the upper connector body into the second receiving hole of the lower connector body. The hydraulic lock assembly then clamps and locks the lower end of the upper connector body. The status indicator component confirms that the connection device is in the locked state, and the connection is completed.

[0033] Furthermore, it also includes the following steps:

[0034] When the upper and lower well control devices are connected and need to be disconnected, the hydraulic lock assembly loosens the lower end of the upper connector body, confirms that the connection device is in the disengaged state through the status indicator component, and disconnects the upper connector and the upper well control device from the lower well control device.

[0035] The beneficial effects of this invention are:

[0036] 1. The status indicator component can remotely determine whether the connection device is in a locked connection or a detachable state, which can be used for high-altitude remote and rapid connection between well control devices during operation, reducing the risk of close-range installation and disassembly operations by operators during the installation and connection process;

[0037] 2. It enables quick connection between well control equipment. The dual-action locking mechanism of hydraulic control and return spring makes the connection safer and more reliable. Even if there is a fault in the hydraulic control, the spring return mechanical locking mechanism can still ensure the locked connection.

[0038] 3. It allows for rapid connection of pressure-bearing sections between well control equipment, and can be used for wellhead blowout prevention and emergency response as well as mechanized wellhead installation, making it highly practical;

[0039] 4. The guide component adopts a large conical surface, which can assist in the centering and connection of the well control equipment. It can also achieve insertion and mating connection when the well control device is at a certain small angle to the ground or is not completely aligned.

[0040] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the locking state of a continuous well control equipment connection device according to an embodiment of the present invention is shown;

[0043] Figure 2 A schematic diagram of the disconnected state of a continuous well control equipment connection device according to an embodiment of the present invention is shown;

[0044] Figure 3 This diagram illustrates the internal structure of a continuous well control equipment connection device in a disengaged state according to an embodiment of the present invention.

[0045] Figure 4 A schematic diagram of the internal structure of a continuous well control equipment connection device in the locked state according to an embodiment of the present invention is shown;

[0046] Figure 5 A schematic diagram of the guide component structure according to an embodiment of the present invention is shown;

[0047] Figure 6 A schematic diagram of a status indicator component indicating the locking state of the connecting device according to an embodiment of the present invention is shown;

[0048] Figure 7 A schematic diagram of a status indicator component indicating the disconnected state of the connection device according to an embodiment of the present invention is shown;

[0049] Figure 8 A schematic diagram of the installation of a hydraulic lock assembly according to an embodiment of the present invention is shown;

[0050] Figure 9 A schematic diagram of a hydraulic lock assembly according to an embodiment of the present invention is shown;

[0051] Figure 10 A schematic diagram of the installation of the fluid circuit assembly according to an embodiment of the present invention is shown;

[0052] Figure 11This diagram illustrates the connection structure required when the well control equipment is in a disconnected state, according to an embodiment of the present invention.

[0053] Figure 12 A schematic diagram of a well control device in a connected state according to an embodiment of the present invention is shown.

[0054] In the diagram: 1. Upper connector; 2. Guide component; 3. Lower connector; 4. Hydraulic lock assembly; 5. Status indicator component; 6. Hydraulic circuit assembly; 11. Upper connector body; 12. First receiving hole; 13. First connector; 14. Sealing part; 15. Elastic sealing ring; 16. First step part; 21. Conical inlet part; 22. Transition part; 23. Mounting panel; 31. Lower connector body; 32. Second receiving hole; 33. Second connector; 34. Second step part; 41. First hydraulic lock assembly; 42. Second hydraulic lock assembly; 43. Third hydraulic lock assembly; 44. Fourth hydraulic lock assembly; 51. First status indicator component; 52. Second status indicator component; 53. Third status indicator component; 54. Fourth status indicator component; 311. First locking groove; 312. Second locking groove; 313. Third locking groove; 314. Fourth locking groove; 411. 412. Flange; 413. Cylinder liner; 414. Piston; 415. Locking block; 416. Return spring; 417. End cap; 418. Lock release oil supply port; 419. Locking oil supply port; 510. Fixing plate; 511. Hinge; 512. Indicator plate; 611. First cylinder connector; 612. Second cylinder connector; 621. First tee connector; 622. Second tee connector; 623. Third tee connector; 624. 625. 626. 627. 628. 629. 631. 632. 633. 644. 645. 646. 647. 648. 100. 100. 100. 2 ... Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0057] This invention provides a connection device for coiled tubing well control equipment, which can realize the connection and disconnection between coiled tubing well control equipment through remote hydraulic control. This solves the problem of remote high-altitude rapid connection of well control equipment during coiled tubing operations, reduces the operational risks of operators having to manually install and disassemble connection parts below the suspended injection head 100, improves operational efficiency, and reduces labor intensity.

[0058] like Figure 1 and Figure 2 As shown, a continuous tubing well control equipment connection device includes an upper connector 1, a guide component 2, a lower connector 3, a hydraulic lock assembly 4, a status indicator component 5, and a hydraulic circuit assembly 6.

[0059] The guide component 2 is located at the upper end of the lower connector 3, which facilitates the upper connector 1 to be aligned and inserted with the lower connector 3 at a remote high altitude.

[0060] like Figure 3 As shown, the upper connector 1 includes an upper connector body 11, which has a first receiving hole 12 along the axial direction. The guide component 2 is fixed to the upper end of the lower connector 3. The lower connector 3 includes a lower connector body 31, which has a second receiving hole 32 that matches the lower end of the upper connector body 11. One end of the hydraulic lock assembly 4 is connected to the lower connector body 31, and the status indicator component 5 is located at the other end of the hydraulic lock assembly 4.

[0061] The upper connector 1 also includes a first connector 13, a sealing part 14, and an elastic sealing ring 15. The first connector 13 is located at the upper end of the upper connector body 11. The first connector 13 can be connected to the upper well control equipment using a union or flange connection. The lower end of the upper connector body 11 is provided with a first step 16, and the sealing part 14 is located at the lower end of the first step 16. The sealing part 14 is provided with a sealing groove along the circumference, and the elastic sealing ring 15 is located in the sealing groove. The first step 16 is an annular step, and the outer diameter of the sealing part 14 is not greater than the outer diameter of the upper connector body 11. The diameter of the first receiving hole 12 is matched with the through diameter of the upper well control equipment.

[0062] like Figure 3 and Figure 5As shown, the guide component 2 includes a tapered inlet portion 21, a transition portion 22, and a mounting panel 23. The tapered inlet portion 21 has a tapered hole along the axial direction, and the diameter of the tapered hole gradually decreases from top to bottom along the axial direction. The lower end of the tapered inlet portion 21 is connected to the mounting panel 23 through the transition portion 22. The mounting panel 23 is fastened to the lower connector body 31 by screws, realizing a detachable connection between the guide component 2 and the lower connector 3. The transition portion 22 has a third receiving hole along the axial direction. The diameter of the lower end of the tapered hole and the diameter of the third receiving hole are both not less than the outer diameter of the first step portion 16.

[0063] like Figure 3 As shown, the lower connector 3 also includes a second connector 33, which is located at the lower end of the lower connector body 31. The second connector 33 can be connected to the well control equipment below by means of a union or a flange.

[0064] Specifically, the second receiving hole 32 includes a first circular hole, a second circular hole, and a third circular hole arranged concentrically from top to bottom along the axial direction. The diameter of the first circular hole is not less than the outer diameter of the first step portion 16, the diameter of the second circular hole is matched with the diameter of the sealing portion 14, and the sealing portion 14 is sealed to the second circular hole through an elastic sealing ring 15.

[0065] like Figure 4 As shown, a second step 34 is formed at the connection between the first and second circular holes. When the lower end of the first step 16 abuts against the upper end of the second step 34, it restricts the upper connector 1 from moving further downward. The outer diameter of the third circular hole is matched with the diameter of the lower well control equipment.

[0066] Multiple hydraulic lock assemblies 4 are provided, and the multiple hydraulic lock assemblies 4 are evenly distributed around the lower connector body 31. The number of status indicator components 5 corresponds to the number of hydraulic lock assemblies 4. Each hydraulic lock assembly 4 is provided with a status indicator component 5. The lower connector body 31 is evenly distributed around the circumference with mounting planes corresponding to the number of hydraulic lock assemblies 4. Adjacent mounting planes are transitioned by arcs.

[0067] The lower connector body 31 is provided with a locking groove corresponding to the number of hydraulic lock assemblies 4 at the middle position of the first circular hole. Multiple locking grooves are evenly distributed along the concentric circumference of the first circular hole, and each mounting surface is provided with a first through hole that penetrates to the locking groove.

[0068] In one embodiment, such as Figure 6 and Figure 7As shown, the hydraulic lock assembly 4 is provided with four sets, including a first hydraulic lock assembly 41, a second hydraulic lock assembly 42, a third hydraulic lock assembly 43, and a fourth hydraulic lock assembly 44. The lower connector body 31 is provided with a first mounting plane, a second mounting plane, a third mounting plane, and a fourth mounting plane evenly distributed along the circumference. The status indicator component 5 is provided with four sets, including a first status indicator component 51, a second status indicator component 52, a third status indicator component 53, and a fourth status indicator component 54. The first status indicator component 51, the second status indicator component 52, the third status indicator component 53, and the fourth status indicator component 54 are sequentially arranged on the first hydraulic lock assembly 41, the second hydraulic lock assembly 42, the third hydraulic lock assembly 43, and the fourth hydraulic lock assembly 44.

[0069] like Figure 8 As shown, four locking slots are provided, including a first locking slot 311, a second locking slot 312, a third locking slot 313 and a fourth locking slot 314.

[0070] The first hydraulic lock assembly 41, the second hydraulic lock assembly 42, the third hydraulic lock assembly 43, and the fourth hydraulic lock assembly 44 have the same structure. Taking the first hydraulic lock assembly 41 as an example, the specific description is as follows:

[0071] like Figure 8 and Figure 9 As shown, the first hydraulic lock assembly 41 includes a flange 411, a cylinder liner 412, a piston 413, a locking block 414, a return spring 415, and an end cover 416. The flange 411 is located at the first end of the cylinder liner 412, and the end cover 416 is located at the second end of the cylinder liner 412. The end cover 416 has a second through hole. The first end of the piston 413 passes through the flange 411 and the first through hole and is connected to the locking block 414. The second end of the piston 413 is slidably connected to the second through hole. A slide is provided in the middle part of the piston 413, and a sealing ring is provided inside the slide. The slide is slidably connected to the inner wall of the cylinder liner 412. The sealing ring is used to form a seal between the slide and the inner wall of the cylinder liner 412. The return spring 415 is fitted on the piston 413. One end of the return spring 415 is fixedly connected to the slide, and the other end is fixedly connected to the end cover 416.

[0072] The cylinder liner 412 has a lock-out oil supply port 417 and a lock-up oil supply port 418 on both sides of the slide of the piston 413. The lock-out oil supply port 417 is close to the first end of the piston 413, and the lock-up oil supply port 418 is close to the second end of the piston 413. The lock-out oil supply port 417 and the lock-up oil supply port 418 are separated from the slide of the piston 413 to form a first hydraulic chamber and a second hydraulic chamber, respectively.

[0073] The flanges 411 of the first hydraulic lock assembly 41, the second hydraulic lock assembly 42, the third hydraulic lock assembly 43, and the fourth hydraulic lock assembly 44 are fixedly connected to the first mounting plane, the second mounting plane, the third mounting plane, and the fourth mounting plane, respectively.

[0074] The locking blocks 414 of the first hydraulic lock assembly 41, the second hydraulic lock assembly 42, the third hydraulic lock assembly 43, and the fourth hydraulic lock assembly 44 are respectively arranged in the first locking groove 311, the second locking groove 312, the third locking groove 313, and the fourth locking groove 314, and each locking block 414 can slide in its corresponding locking groove.

[0075] In one embodiment, the hydraulic circuit assembly 6 includes a cylinder connector, a tee connector, a hydraulic line, and a quick connector. The first hydraulic chamber (lock-out supply chamber) and the second hydraulic chamber (lock-out supply chamber) of multiple hydraulic lock assemblies 4 are connected in series through the cylinder connector, the tee connector, and the hydraulic line, ultimately forming two quick-connect interfaces for locking and unlocking, which are connected by quick connectors.

[0076] In one embodiment, such as Figure 10 As shown, if the hydraulic lock assembly 4 is provided with four sets, then the hydraulic circuit assembly 6 includes a first cylinder connector 611, a second cylinder connector 612, a first tee connector 621, a second tee connector 622, a third tee connector 623, a fourth tee connector 624, a fifth tee connector 625, a sixth tee connector 626, a first hydraulic line 641, a second hydraulic line 642, a third hydraulic line 643, a fourth hydraulic line 644, a fifth hydraulic line 645, a sixth hydraulic line 646, a first quick connector 631, and a second quick connector 632. The specific connection relationship is as follows:

[0077] The lock release oil supply port 417 and lock supply port 418 of the first hydraulic lock assembly 41 are respectively connected to the first end of the first cylinder connector 611 and the first end of the second cylinder connector 612. The lock release oil supply port 417 and lock supply port 418 of the second hydraulic lock assembly 42 are respectively connected to the first end of the first tee connector 621 and the first end of the second tee connector 622. The lock release oil supply port 417 and lock supply port 418 of the third hydraulic lock assembly 43 are respectively connected to the first end of the third tee connector 623 and the first end of the fourth tee connector 624. The lock release oil supply port 417 and lock supply port 418 of the fourth hydraulic lock assembly 44 are respectively connected to the first end of the fifth tee connector 625 and the first end of the sixth tee connector 626.

[0078] One end of the first hydraulic line 641 is connected to the second end of the first cylinder connector 611, and the other end is connected to the second end of the first tee connector 621; one end of the second hydraulic line 642 is connected to the third end of the first tee connector 621, and the other end is connected to the second end of the third tee connector 623; one end of the third hydraulic line 643 is connected to the third end of the third tee connector 623, and the other end is connected to the second end of the fifth tee connector 625, the third end of the fifth tee connector 625 being connected to the first quick connector 631. The first hydraulic chambers (lock-out / unlock supply chambers) of the four hydraulic lock assemblies 4 are connected in series via the first hydraulic line 641, the second hydraulic line 642, and the third hydraulic line 643 to form the lock-out / unlock supply interface, i.e., the first quick connector 631.

[0079] The fourth hydraulic line 644 is connected at one end to the second end of the second cylinder connector 612 and at the other end to the second end of the second tee connector 622; the fifth hydraulic line 645 is connected at one end to the third end of the second tee connector 622 and at the other end to the second end of the fourth tee connector 624; the sixth hydraulic line 646 is connected at one end to the third end of the fourth tee connector 624 and at the other end to the second end of the sixth tee connector 626, and the third end of the sixth tee connector 626 is connected to the second quick connector 632. The fourth hydraulic line 644, the fifth hydraulic line 645, and the sixth hydraulic line 646 are connected in series to form the second hydraulic chambers (locking oil supply chambers) of the four hydraulic lock assemblies 4, thus forming the locking oil supply interface, i.e., the second quick connector 632.

[0080] The first state indicator 51, the second state indicator 52, the third state indicator 53, and the fourth state indicator 54 have the same structure. Taking the first state indicator 51 as an example, a specific explanation will be given:

[0081] like Figure 7 As shown, the first state indicator component 51 includes a fixed plate 511, a hinge 512, and an indicator plate 513. The fixed plate 511 is fixed to the end cover 416 of the first hydraulic lock assembly 41. The indicator plate 513 is movably connected to the fixed plate 511 through the hinge 512. When the second end of the piston 413 extends out of the second through hole, the indicator plate 513 is pushed to a horizontal position. When the second end of the piston 413 of the first hydraulic lock assembly 41 retracts into the second through hole, the indicator plate 513 adheres to the end cover 416 under the action of gravity.

[0082] The connection relationships between the second state indicator component 52, the third state indicator component 53, and the fourth state indicator component 54 and the second hydraulic lock assembly 42, the third hydraulic lock assembly 43, and the fourth hydraulic lock assembly 44 are implemented with reference to the first state indicator component 51 and the first hydraulic lock assembly 41 described above, and will not be repeated here.

[0083] In one embodiment, the locking block 414 is arc-shaped, including a first arc surface and a second arc surface. The first arc surface is provided with a T-shaped keyway. Each locking block 414 is connected to the first end of the piston 413 of the hydraulic lock assembly 4 through the T-shaped keyway. The radius of the second arc surface is matched with the radius of the upper connector body 11.

[0084] The principle of this invention is as follows: The continuous tubing well control equipment connection device is equipped with two hydraulic line control interfaces for locking and unlocking. When the upper connector 1 is fully inserted into the lower connector 3, the locking oil supply interface of the hydraulic lock assembly 4 supplies oil, and under the action of the return spring 415, the locking block 414 of the hydraulic lock assembly 4 pushes forward to clamp the upper connector 1 and locks and limits it at the first step. At this time, the upper connector 1 and the lower connector 3 are in a locked connection state. When the upper connector 1 and the lower connector 3 are in a locked connection state, the unlocking oil supply interface supplies oil, the return spring 415 of the hydraulic lock assembly 4 is compressed, and the locking block 414 of each hydraulic lock assembly 4 retracts and releases the locking and limiting of the first step. At this time, the upper connector 1 and the lower connector 3 are in a disengageable state.

[0085] The present invention also provides a method for using the above-mentioned continuous tubing control equipment connection device, including the following steps: the lower end of the upper connector body 11 of the upper connector 1 is guided by the guide component 2 to be inserted into the second receiving hole 32 of the lower connector 3; the lower end of the upper connector body 11 is locked or released by the hydraulic lock assembly 4; the state of the hydraulic lock assembly 4 is determined by the status indicator component 5. If the hydraulic lock assembly 4 locks the lower end of the upper connector body 11, the status indicator component 5 indicates that the connection device is in a locked state; if the hydraulic lock assembly 4 releases the lower end of the upper connector body 11, the status indicator component 5 indicates that the connection device is in a disengaged state.

[0086] Specifically, the connection or disconnection of the connecting device includes: connecting the pipelines of the two hydraulic sources to the locking oil supply port and the locking release oil supply port respectively through quick-connect couplings; when the upper connector 1 and the lower connector 3 are in a locked connection state or a disengaged state before pre-connection, the hydraulic control valve pressurizes the locking release oil supply port to the locking release hydraulic chamber; under the pressure driving force of the locking release hydraulic chamber, the locking hydraulic chamber releases oil, the return spring 415 of the hydraulic lock assembly 4 is compressed, and the piston 413 of the hydraulic lock assembly 4 drives the locking block 414 to retract, fully opening the inner cavity channel of the lower connector 3; at this time, the indicator plate 513 of the status indicator component 5 is pushed into a horizontal unfolded state by the second end of the piston 413 extending from the end cover 416; by remote observation, it can be determined that the upper connector 1 and the lower connector 3 are in a disengaged state before disconnection or an insertable state before pre-connection.

[0087] When the upper connector 1 is fully inserted into the inner cavity of the lower connector 3, the hydraulic control valve pressurizes the locking hydraulic chamber through the locking oil supply port. Under the spring return force and hydraulic driving force, the locking release hydraulic chamber releases oil, and the piston 413 of the hydraulic lock assembly 4 pushes the locking block 414 to lock and limit the upper connector 1 at the first step. The second end of the extended piston 413 retracts from the end cover 416. At this time, the indicator plate 513 of the status indicator component 5 adheres to the end cover 416 of the hydraulic lock assembly 4 under the action of gravity. By remote observation, it can be determined that the upper connector 1 and the lower connector 3 are in a locked connection state.

[0088] A method of using a continuous well control device connection device further includes: when the upper well control device and the lower well control device are in a disconnected state and need to be connected, the status of the hydraulic lock assembly 4 is determined by the status indicator component 5. If the hydraulic lock assembly 4 is in a loose state, the lower end of the upper connector body 11 is guided by the guide component 2 to be inserted into the second receiving hole 32 of the lower connector body 31. The lower end of the upper connector body 11 is clamped and locked by the hydraulic lock assembly 4. The status indicator component 5 determines that the connection device is in a locked state, and the connection is completed.

[0089] like Figure 11 and Figure 12 As shown, specifically, connecting the upper well control device and the lower well control device includes: the upper connector 1 of the well control equipment connecting device is installed and connected to the lower end of the upper well control device such as the blowout preventer box 200 or blowout preventer pipe 300 through the first connector 13 (union or flange type); the lower connector 3 is installed and connected to the upper end of the lower well control device such as the blowout preventer pipe 300 or blowout preventer 400 through the second connector 33 (union or flange type); and the hydraulic oil tank, hydraulic power source and connecting device oil port are connected.

[0090] When the upper and lower well control devices are disconnected and need to be connected, first operate the hydraulic control valve to supply oil to the lock release oil supply port 417. After the lock block 414 retracts, the indicator plate 513 of the status indicator component 5 determines the vertical contact status. Then, the crane lifts the injection head 100 and the upper well control device together into the insertion guide device for alignment. After the upper connector 1 is fully inserted into the inner cavity of the lower connector 3, operate the hydraulic control valve to supply oil to the lock supply port 418. The indicator plate 513 of the status indicator component 5 determines the horizontal status and pushes the lock block 414 forward and tightens, thus realizing the remote connection operation between the well control devices.

[0091] A method of using a continuous tubular well control equipment connection device further includes: when the upper well control device and the lower well control device are in a connected state and need to be disconnected, the hydraulic lock assembly 4 loosens the lower end of the upper connector body 11, and the status indicator component 5 determines that the connection device is in a disconnected state, thereby disconnecting the upper connector 1 and the upper well control device from the lower well control device.

[0092] Specifically, disconnecting the upper and lower well control devices includes: operating the hydraulic control valve to supply oil to the lock release oil supply port 417; judging the status of the lock block 414 after the indicator plate 513 of the status indicator component 5 retracts; and then the crane lifts the injection head 100 along with the upper well control device from the lower well control device to disconnect it, thereby realizing the remote disconnection operation between the well control devices.

[0093] The continuous tubing well control equipment connection device of this invention enables rapid connection between well control devices. The dual-action locking mechanism of the hydraulic control and return spring 415 ensures a safer and more reliable connection. Even in the event of a hydraulic control failure, the mechanical locking mechanism of the return spring 415 guarantees a secure connection. The status indicator 5 can remotely determine whether the connection device is in a locked or detachable state, allowing for rapid, high-altitude remote connection between well control devices during operations, reducing the risk of close-range installation and disassembly by personnel. For rapid connection in pressure-bearing sections between well control devices, it can be used for wellhead blowout prevention and mechanized installation, demonstrating strong practicality. The insertion guide component 2 of the connection device adopts a large conical surface, assisting in the centering connection of the well control equipment. It allows for insertion and mating connection even when the well control device is at a small angle to the ground or not fully aligned.

[0094] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connection device for a continuous tubing well control system, characterized in that, It includes an upper connector, a guide component, a lower connector, a hydraulic lock assembly, and a status indicator component; The upper connector includes an upper connector body, which has a first receiving hole along the axial direction. The guide component is disposed at the upper end of the lower connector. The lower connector includes a lower connector body, which has a second receiving hole along the axial direction that matches the lower end of the upper connector body. One end of the hydraulic lock assembly is connected to the lower connector body, and the status indicator component is disposed at the other end of the hydraulic lock assembly. The upper connector further includes a first connector, a sealing part, and an elastic sealing ring; wherein, the first connector is disposed at the upper end of the upper connector body, the lower end of the upper connector body is provided with an annular first step, the sealing part is disposed at the lower end of the first step, the sealing part is provided with a sealing groove along the circumferential direction, the elastic sealing ring is disposed in the sealing groove, the outer diameter of the sealing part is not greater than the outer diameter of the upper connector body, and the diameter of the first receiving hole is matched with the through diameter of the upper well control equipment; The second receiving hole includes a first circular hole, a second circular hole, and a third circular hole concentrically arranged from top to bottom along the axial direction; wherein, the diameter of the first circular hole is not less than the outer diameter of the first stepped portion, the diameter of the second circular hole is matched with the diameter of the sealing portion, the connection between the first circular hole and the second circular hole forms a second stepped portion, when the lower end of the first stepped portion abuts against the upper end of the second stepped portion, it restricts the upper connector from continuing to move downward, and the outer diameter of the third circular hole is matched with the through diameter of the lower well control equipment; Multiple hydraulic lock assemblies are provided, and the multiple hydraulic lock assemblies are evenly distributed around the lower connector body. The lower connector body is provided with a locking groove at the middle position of the first circular hole. The number of the status indicator component and the number of the locking groove are provided in a one-to-one correspondence with the number of hydraulic lock assemblies. The multiple locking grooves are evenly distributed around the first circular hole in a concentric circle. The hydraulic lock assembly includes a flange, a cylinder liner, a piston, a locking block, a return spring, and an end cap. The flange is located at the first end of the cylinder liner, and the end cap is located at the second end of the cylinder liner, with a second through hole on the end cap. The locking block is located within a locking groove. The first end of the piston passes through the flange and connects to the locking block, while the second end of the piston is slidably connected to the second through hole. A slide is located in the middle of the piston, slidably connected to the inner wall of the cylinder liner. The return spring is fitted onto the piston, with one end fixedly connected to the slide and the other end fixedly connected to the end cap. The cylinder liner has a lock-release oil supply port and a lock-in oil supply port on both sides of the slide, with the lock-release oil supply port near the first end of the piston and the lock-in oil supply port near the second end of the piston. The status indicator component includes a fixed plate, a hinge, and an indicator plate; wherein, the fixed plate is fixed to the end cap, and the indicator plate is movably connected to the fixed plate through the hinge; when the second end of the piston extends out of the second through hole, the indicator plate is pushed to a horizontal position; when the second end of the piston retracts into the second through hole, the indicator plate is attached to the end cap.

2. The connection device for continuous tubing well control equipment according to claim 1, characterized in that, The guide component includes a tapered inlet, a transition section, and a mounting panel; The tapered inlet portion has a tapered hole along the axial direction, the diameter of which gradually decreases from top to bottom along the axial direction. The lower end of the tapered inlet portion is connected to the mounting panel through the transition portion. The mounting panel is detachably connected to the lower connector body. The transition portion has a third receiving hole along the axial direction. The diameter of the lower end of the tapered hole and the diameter of the third receiving hole are both not less than the outer diameter of the first step portion.

3. The connection device for continuous tubing well control equipment according to claim 1 or 2, characterized in that, The lower connector also includes a second connector, which is disposed at the lower end of the lower connector body.

4. The connection device for continuous tubing well control equipment according to claim 1, characterized in that, It also includes a hydraulic circuit assembly, which includes a first cylinder connector, a second cylinder connector, a first tee connector, a second tee connector, a third tee connector, a fourth tee connector, a fifth tee connector, a sixth tee connector, a first hydraulic line, a second hydraulic line, a third hydraulic line, a fourth hydraulic line, a fifth hydraulic line, a sixth hydraulic line, a first quick connector and a second quick connector, and multiple hydraulic lock assemblies including a first hydraulic lock assembly, a second hydraulic lock assembly, a third hydraulic lock assembly and a fourth hydraulic lock assembly; Wherein, the lock release oil supply port and the lock supply port of the first hydraulic lock assembly are respectively connected to the first end of the first cylinder connector and the first end of the second cylinder connector; the lock release oil supply port and the lock supply port of the second hydraulic lock assembly are respectively connected to the first end of the first tee connector and the first end of the second tee connector; the lock release oil supply port and the lock supply port of the third hydraulic lock assembly are respectively connected to the first end of the third tee connector and the first end of the fourth tee connector; and the lock release oil supply port and the lock supply port of the fourth hydraulic lock assembly are respectively connected to the first end of the fifth tee connector and the first end of the sixth tee connector. One end of the first hydraulic line is connected to the second end of the first cylinder connector, and the other end is connected to the second end of the first tee connector; one end of the second hydraulic line is connected to the third end of the first tee connector, and the other end is connected to the second end of the third tee connector; one end of the third hydraulic line is connected to the third end of the third tee connector, and the other end is connected to the second end of the fifth tee connector, and the third end of the fifth tee connector is connected to the first quick connector. One end of the fourth hydraulic line is connected to the second end of the second cylinder connector, and the other end is connected to the second end of the second tee connector; one end of the fifth hydraulic line is connected to the third end of the second tee connector, and the other end is connected to the second end of the fourth tee connector; one end of the sixth hydraulic line is connected to the third end of the fourth tee connector, and the other end is connected to the second end of the sixth tee connector, and the third end of the sixth tee connector is connected to the second quick connector.

5. The connection device for continuous tubing well control equipment according to claim 1 or 4, characterized in that, The locking block is arc-shaped, including a first arc surface and a second arc surface; The first arc surface is provided with a T-shaped keyway, and each locking block is connected to the first end of the piston through the T-shaped keyway. The radius of the second arc surface is matched with the radius of the upper connector body.

6. A method for using a connection device for a continuous tubing well control system, characterized in that, The coiled tubing control equipment connection device according to any one of claims 1-5, the coiled tubing control equipment connection device comprising an upper connector, a guide component, a lower connector, a hydraulic lock assembly, and a status indicator component, wherein: The guide component guides the lower end of the upper connector body of the upper connector to be inserted into the second receiving hole of the lower connector, wherein the second receiving hole is arranged along the axial direction of the lower connector body of the lower connector; The lower end of the upper connector body is locked or released by the hydraulic lock assembly, wherein one end of the hydraulic lock assembly is connected to the lower connector body; and a status indicator component is located at the other end of the hydraulic lock assembly. The status of the hydraulic lock assembly is determined by setting a status indicator component. If the hydraulic lock assembly clamps and locks the lower end of the upper connector body, the status indicator component indicates that the connecting device is in a locked state; if the hydraulic lock assembly loosens the lower end of the upper connector body, the status indicator component indicates that the connecting device is in a disengaged state. The status indicator component is located at the other end of the hydraulic lock assembly.

7. The method of using the connection device for continuous tubing well control equipment according to claim 6, characterized in that, It also includes the following steps: Connect the upper end of the upper connector to the lower end of the upper well control device, and connect the lower end of the lower connector to the upper end of the lower well control device. When the upper and lower well control devices are disconnected and need to be connected, the status of the hydraulic lock assembly is determined by the status indicator component. If the hydraulic lock assembly is in the loose state, the guide component guides the lower end of the upper connector body into the second receiving hole of the lower connector body. The hydraulic lock assembly then clamps and locks the lower end of the upper connector body. The status indicator component confirms that the connection device is in the locked state, and the connection is completed.

8. The method of using the connection device for continuous tubing well control equipment according to claim 7, characterized in that, It also includes the following steps: When the upper and lower well control devices are connected and need to be disconnected, the hydraulic lock assembly loosens the lower end of the upper connector body, confirms that the connection device is in the disengaged state through the status indicator component, and disconnects the upper connector and the upper well control device from the lower well control device.

Images