A lift well control skid apparatus for coiled tubing operations

Abstract

The utility model discloses a kind of for coiled tubing operation's lifting well control skid device, the side of support frame being provided with clamp on pry seat installs blowout preventer group, the side of support frame being provided with blowout preventer cannon pin installs blowout preventer group, lifting mechanism is used to lift support frame to required height position, install injection head on support frame, butt joint blowout preventer box below support frame, blowout preventer in well control system, blowout preventer box, blowout preventer pipe are integrated to pry seat, overall hoisting is carried out by the lug plate of top, realize wellhead device overall disposable hoisting removal, indirectly improve the efficiency of wellhead operation, overall pry installation device high integration, small space occupation, with continuous pipe operation machine is matched with application, effectively reduce the space pressure of main car, convenient to transfer removal, suitable for wellhead operation of wellhead space being limited, can effectively solve the problem of low efficiency, high risk in well control device group string installation and disassembly process, improve continuous pipe operation installation and dismounting operation efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the technical field of coiled tubing operation equipment. More specifically, this utility model relates to a lifting well control skid device for coiled tubing operations. Background Technology

[0002] In recent years, in order to further improve the technology and equipment for coiled tubing operations in deep shale gas blocks, higher requirements have been put forward for the humanized equipment matching and the improvement of on-site efficiency in coiled tubing operations. Since the well control system includes many installation steps, this has resulted in high work intensity, low efficiency and high risk in wellhead installation.

[0003] Currently, in order to promote the equipment matching and efficiency improvement of long horizontal section coiled tubing operations in deep shale gas, there is an urgent need to develop a new type of lifting well control skid device for coiled tubing operations, which can be used in conjunction with coiled tubing installation machines to effectively solve the problems of low efficiency and high risk in the installation and disassembly of well control device strings, and improve the operational efficiency and safety of coiled tubing operations in the installation and disassembly stages. Summary of the Invention

[0004] The purpose of this invention is to provide a lifting well control skid device for coiled tubing operations, in order to solve the technical problem of low installation efficiency caused by the lack of supporting installation equipment for well control systems used in coiled tubing operations in the prior art.

[0005] To achieve these objectives and other advantages according to this utility model, a lifting well control skid device for coiled tubing operations is provided, including a skid base. A support frame for installing an injection head is provided upward in the middle of the skid base. The support frame is used to install the injection head. A lifting mechanism is connected between the bottom of the support frame and the inner bottom of the skid base to drive the support frame to rise and fall and temporarily fix it. Inside the skid base, a clamp is provided on one side of the support frame and a blowout preventer (BOP) shell pin is provided on the other side. The clamp is used to limit the installation of the BOP assembly, and the BOP shell pin is used to position and install the BOP assembly. A BOP box mounting seat is fixed to the inner bottom of the skid base below the support frame. The BOP box mounting seat is connected upward to the BOP box. Lugs for hoisting are symmetrically connected at the top corners of the skid base and the top corners of the support frame. Operating platforms are provided on the top surface of the skid base and the top surface of the support frame, respectively. Ladders that connect to the corresponding operating platforms are provided on the sides of the skid base and the sides of the support frame, respectively.

[0006] Preferably, the lifting structure includes:

[0007] The upper column is symmetrically connected downwards to the bottom of the support frame and is located on the outside of the blowout preventer box;

[0008] The lower column is arranged adjacent to each upper column on the outside of the blowout preventer box. The bottom of the lower column is fixedly connected to the bottom of the pry bar. The lower column and the upper column are respectively provided with pin holes. When the corresponding pin holes are on the same horizontal line, a pin shaft is detachably inserted into them. The height of a pair of upper columns relative to the lower column is temporarily fixed.

[0009] The sliding mechanism includes a pair of baffles parallel to each other on both sides of the lower column and the upper column. The inner side of the baffles is fixed to the upper column with a sliding plate. A roller is connected between the ends of the pair of baffles on the same side in the horizontal direction through a bushing. The roller rolls up and down against the outer side of the upper column. The pair of baffles on the other side in the horizontal direction is fixedly connected to the upper end of the lower column.

[0010] The hydraulic cylinder is symmetrically arranged on the outside of the lower column and vertically connected between the pry bar and the bottom of the support frame.

[0011] Preferably, a tilting pedal is hinged to the side of the pry bar near the blowout preventer assembly or blowout preventer pipe assembly, and a stop block is connected to the bottom of the tilting pedal to support the lower limit of the tilting pedal's rotation. A limit hole is provided at the top of the tilting pedal, and a bolt hole is provided on the side of the pry bar corresponding to the limit hole of the tilting pedal. By screwing a bolt into both the limit hole and the bolt hole, the tilting pedal is temporarily fixed in a vertical state.

[0012] Preferably, the bottom of the pry bar is equipped with a drainage groove, and a drainage plug is provided on the drainage groove.

[0013] Preferably, the blowout preventer mounting base includes a lower flange seat welded to the skid, an upper flange seat is bolted to the lower flange seat, a union plug is welded to the upper end of the upper flange seat, and the blowout preventer is connected to the upper end of the union plug.

[0014] Preferably, a guardrail socket is provided at the top corner of the operating platform, guardrails are provided around the support frame and connected to the guardrail sockets, a kick plate is provided at the bottom of the guardrails, and a passage opening is provided in the guardrails at the ladder position.

[0015] This utility model has at least the following beneficial effects: The lifting-type well control skid device for coiled tubing operations of this utility model has a blowout preventer (BOP) assembly installed on the side of the support frame with clamps on the skid base, and a BOP assembly installed on the side of the support frame with BOP projectile pins. The support frame is lifted to the required height using a lifting mechanism, and an injection head is installed on the support frame to connect with the BOP box below the support frame. The BOP, BOP box, and BOP in the well control system are integrated onto the skid base, and the entire assembly is hoisted and moved at one time using the ear plates set at the top, which indirectly improves the efficiency of wellhead operations. The integrated skid device is highly integrated and occupies little space. When used in conjunction with a coiled tubing installation machine, it effectively reduces the space pressure on the main vehicle, facilitates relocation, and is suitable for wellhead operations with limited space. It can effectively solve the problems of low efficiency and high risk in the installation and disassembly of well control device strings, and improve the operational efficiency and safety of coiled tubing operations in the installation and disassembly stages.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the pry bar and support frame of this utility model;

[0018] Figure 2 This is a front view of the skid base and support frame of this utility model after the blowout preventer assembly and blowout preventer pipe assembly are installed.

[0019] Figure 3 This is a front view of the support frame of this utility model after it has been lifted.

[0020] Figure 4 This is a left-side structural view of the pry bar and support frame of this utility model;

[0021] Figure 5 This is a schematic diagram of the sliding mechanism according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of a screw motor base according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the accompanying drawings: 1. Skid mount; 2. BOP assembly; 3. Projectile pin; 4. Rubber pad; 5. Clamp; 6. Hydraulic cylinder mounting base; 7. Ear plate; 8. Skid mount ladder; 9. Tilting pedal; 10. Pin; 11. BOP assembly; 12. BOP projectile pin; 13. Drain plug; 14. Screw motor lower flange; 15. Screw motor upper flange; 16. Bearing cover; 17. Screw bracket; 18. Screw motor; 19. BOP base lower flange seat. Flange seat 20 on the base of the blowout preventer, union plug 21, blowout preventer 22, support frame 23, roller 24, threaded plate 25, baffle 26, sliding plate 27, bushing 28, injection head shell pin 29, injection head 30, support frame ladder 31, safety handrail 32, operating platform 33, guardrail 34, kick plate 35, gooseneck tube 36, hydraulic cylinder 37, hydraulic station 38, tilting pedal one 39, tilting pedal two 40. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0025] In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figure 1-4 As shown, the lifting well control skid device for coiled tubing operations of this utility model includes a skid base 1. A support frame 23 for installing an injection head 30 is provided upwards in the middle of the skid base 1. The support frame 23 is used to install the injection head 30. A lifting mechanism is connected between the bottom of the support frame 23 and the inner bottom of the skid base 1 to drive the support frame to rise and fall and temporarily fix it. Inside the skid base, a clamp 5 is provided on one side of the support frame, and a blowout preventer (BOP) ejector pin 12 is provided on the other side. The clamp 5 is used to limit the installation of the BOP assembly 2. The blowout preventer assembly 2 is positioned and installed using the blowout preventer shell pin 12. The bottom inner side of the pry bar 1 is fixed with a blowout preventer box mounting base below the support frame 23. The blowout preventer box mounting base is connected upward to the blowout preventer box 22. The top of the pry bar 1 and the top of the support frame are symmetrically connected with ear plates 7 for hoisting. The top surface of the pry bar and the top surface of the support frame are respectively provided with operating platforms 33. The sides of the pry bar 1 and the sides of the support frame 23 are respectively provided with ladders (8, 31) that connect with the corresponding operating platforms 33.

[0027] The main structural materials of the skid base, ear plates, etc., are made of high-strength structural steel. Rubber pads 4 are installed on the base of the skid base at point 2 of the blowout preventer assembly to reduce the buffering force during lifting and installation. The clamp 5 is a combination of two hinged semi-circular structures, which can be fastened with bolts. One end of the semi-circular structure is fixed to the upper end of the blowout preventer assembly, and the other end is fixed to the skid base 1. Safety handrails 32 are installed on ladders 8 and 31. The operating platform 33 facilitates the installation of tool sets by on-site operators, addressing the difficulty of installing screw motors, thus improving efficiency and safety, and making installation and disassembly more standardized. The operating platform 33 of the injection head is equipped with an injection head projectile pin 29 for installation. The blowout preventer projectile positioning pin 12 has a precise positioning tolerance, making the well control device easy to operate, install, and position, with good centering, effectively reducing the labor intensity of operators. The clamp 5 is lightweight and compact; simply removing the bolts on the opposite hinged side to open the clamp allows for lifting of the blowout preventer, reducing the labor intensity of on-site operators and improving the efficiency of well control system installation and operation.

[0028] The skid structure can accommodate a complete set of well control equipment required for the wellhead. On the skid 1, a blowout preventer (BOP) assembly 2 is installed on the side of the support frame with clamps 5, and a blowout preventer (BOP) assembly 11 is installed on the side of the support frame 23 with BOP projectile pins 12. The support frame is lifted to the required height using a lifting mechanism, and an injection head 30 is installed on the support frame 23, connecting to the BOP box 22 below the support frame. The BOP 11, BOP box 22, and BOP 2 in the well control system are integrated onto the skid 1. The entire assembly is then lifted and moved at once using the top lugs 7, indirectly improving the efficiency of wellhead operations. This new type of lifting well control skid for coiled tubing is highly integrated and occupies little space. When used in conjunction with a coiled tubing installation machine, it effectively reduces the space pressure on the main vehicle, facilitates relocation, and is suitable for wellhead operations with limited space. It effectively solves the problems of low efficiency and high risk during the installation and disassembly of well control equipment strings, improving the efficiency and safety of coiled tubing operations during installation and disassembly.

[0029] The lifting well control skid device of this embodiment can be used according to the following steps:

[0030] (1) Use a crane to lift the device to a suitable position at the center of the wellhead, and then lift the blowout preventer assembly to the wellhead for installation;

[0031] (2) Lift the injection head support frame to the injection head installation height through the lifting mechanism and temporarily fix the height there. Quickly install the injection head 30 through the injection head projectile pin 29.

[0032] (3) Then, the injection head goose neck tube 36 and the blowout preventer 22 are hoisted as a whole to the top of the support frame and installed in a centered position;

[0033] (4) Oil pipe roller outlet pipe, on-site operators climb up the operating platform via ladder to install the oil pipe during transportation;

[0034] (5) Lift the injection head goose neck tube 36 directly above the blowout preventer assembly, open the blowout preventer clamps to install it, and lift the injection head goose neck tube blowout preventer assembly as a whole to the top of the operating platform. On-site operators install the downhole tool string on the operating platform. Finally, lift the injection head goose neck tube blowout preventer assembly, blowout preventer assembly and downhole tools as a whole to the wellhead for installation. Only one crane is needed for the whole process.

[0035] In another technical solution, such as Figure 1-3 As shown in Figure 5, the lifting structure includes:

[0036] The upper column is symmetrically connected downwards to the bottom of the support frame and is located on the outside of the blowout preventer 22;

[0037] The lower column is arranged adjacent to each upper column on the outside of the blowout preventer box. The bottom of the lower column is fixedly connected to the bottom of the pry bar 1. The lower column and the upper column are respectively provided with pin holes. When the corresponding pin holes are on the same horizontal line, a pin shaft 10 is detachably inserted. The height of a pair of upper columns relative to the lower column is temporarily fixed.

[0038] The sliding mechanism includes a pair of baffles 26 arranged parallel to each other on both sides of the lower column and the upper column. The inner side of the baffles 26 is fixed to the upper column with a sliding plate 27. A roller 24 is connected between the ends of the pair of baffles 26 on the same side in the horizontal direction through a bushing 28. The roller 24 rolls up and down against the outer side of the upper column. The pair of baffles 26 on the other side in the horizontal direction is fixed to the upper end of the lower column by screwing in bolts through a threaded plate 25.

[0039] Hydraulic cylinder 37 is symmetrically arranged on the outside of the lower column and vertically connected between the bottom of the skid 1 and the support frame. The skid 1 is provided with a hydraulic cylinder mounting seat 6 to facilitate support hinge connection with the telescopic end of the hydraulic cylinder 37.

[0040] A hydraulic station 38 is installed on the skid base. All hydraulic cylinders are powered by the hydraulic station. Remote control enables automated, highly precise, synchronous, and rapid lifting and lowering of the injection head support frame relative to the skid base. The sliding mechanism features rollers on bushings; the rolling friction of the rollers significantly reduces wear. The sliding plates and rollers are made of polytetrafluoroethylene (PTFE) for easy sliding. Horizontally, the upper column is limited in all directions within the horizontal plane by the lower column, a pair of baffles, and rollers. The support frame can achieve rapid mechanical lifting and lowering relative to the skid base structure via the sliding mechanism. The limiting method uses dedicated pins to fix the injection head support frame and skid base structure at the required relative positions. The pin holes are designed and spaced according to the user's site requirements. The sliding mechanism is connected with fasteners, facilitating maintenance and disassembly of the entire device. The rolling friction movement enables rapid mechanical lifting and lowering of the well control skid, reducing skid wear and significantly extending the device's service life.

[0041] In another technical solution, such as Figure 1-4 As shown, a tilting pedal 9 (including 39 and 40) is hinged to the side of the pry bar 1 near the blowout preventer assembly or blowout preventer pipe assembly, and a stop block is connected to the bottom of the tilting pedal to support the lower limit position of the tilting pedal's rotation. A limit hole is opened on the top of the tilting pedal, and a bolt hole is provided on the side of the pry bar corresponding to the limit hole of the tilting pedal. By screwing a bolt into both the limit hole and the bolt hole, the tilting pedal is temporarily fixed in a vertical state.

[0042] The flip-up pedal can rotate 270°. Made of aluminum, it is easy for operators to fold, allowing personnel to stand anywhere on the workbench to perform underground work without needing to flip it. During transport, the flip-up pedal is set in a vertical position and temporarily secured by bolts screwed into the bolt holes or other methods, minimizing its space occupation. In use, the bolts are removed, the pedal is rotated, and it is supported by a stop block. Of course, the flip-up pedal can also be designed as a self-resetting structure with a spring. There are many existing products with this technology, so we will not go into details here.

[0043] In another technical solution, such as Figure 2 As shown, the bottom of the pry bar is equipped with a drainage groove, and a drainage plug 13 is provided on the drainage groove to prevent water from accumulating at the bottom of the pry bar 1.

[0044] In another technical solution, such as Figure 1 As shown, the blowout preventer mounting base includes a lower flange seat 19 welded to the skid seat, an upper flange seat 20 connected upwards to the lower flange seat by bolts, a union plug 21 welded to the upper end of the upper flange seat 20, and a blowout preventer 22 connected to the upper end of the union plug, thus ensuring the stability of the blowout preventer during transportation.

[0045] A lower flange seat 19 is welded onto the base of the skid-mounted structure. Before welding, the lower flange seat 19 of the blowout preventer base adopts a manual jack structure for manual lifting and lowering to achieve a precise connection between the blowout preventer and the base. The lower flange seat 19 of the blowout preventer base is bolted to the upper flange seat 20 of the blowout preventer base. A union plug 21 is welded to the upper end of the upper flange seat of the blowout preventer base, and the upper end of the union plug 21 is connected to the blowout preventer.

[0046] In another technical solution, such as Figure 3 As shown, a guardrail socket is provided at the top corner of the operating platform, and guardrails 34 are provided around the support frame through the guardrail socket. A kick plate 35 is provided at the bottom of the guardrail, and the guardrail 34 leaves a passage opening at the ladder position.

[0047] The two guardrails 34 can be detached and symmetrically set. When the wellhead is not in operation, the guardrail of the operating platform can be placed, which makes the whole structure more compact and has advantages such as small transportation volume.

[0048] In another technical solution, such as Figure 6 As shown, a screw motor lower flange 14, a screw motor upper flange 15, a bearing cover 16, and a screw bracket 17 are sequentially arranged upwards at the bottom center of the skid base. The screw motor lower flange is fixedly connected to the skid base. The lower end of the screw motor upper flange is connected to the screw motor lower flange by fasteners, and the upper end is connected to the bearing cover by fasteners. A sealing ring is fitted on the bearing cover and it is sealed to the screw bracket. The upper end of the screw bracket has a concave platform structure. The lower end of the screw bracket passes into the screw motor lower flange and is connected to the screw motor lower flange by a deep groove ball bearing and a thrust ball bearing. A sealing ring is fitted on the bottom of the screw bracket and it is sealed to the screw motor lower flange. Two oil cups are installed on the screw motor lower flange.

[0049] A screw motor is installed to provide power for subsequent drilling operations. The screw motor base consists of a lower screw motor flange 14, an upper screw motor flange 15, a bearing cover 16, a screw bracket 17, and oil cups. The upper end of the screw bracket adopts a concave platform structure to ensure that the screw motor 18 can be placed in the screw bracket. The lower end of the screw bracket is connected to the lower screw motor flange via a deep groove ball bearing and a thrust ball bearing. The combination of these two bearings ensures axial and lateral load-bearing capacity. A bushing is installed at the lower end of the lower screw motor flange, and a sealing ring is fitted between the lower screw motor flange and the lower end of the screw bracket. Two oil cups are installed on the lower screw motor flange to ensure lubrication inside the screw motor base, ensuring smooth rotation. This allows the screw motor to rotate freely along its axial direction, making it easy for on-site operators to install, thus improving work efficiency and reducing labor intensity.

[0050] The novel lifting well control skid device for coiled tubing in this embodiment adopts a mechanical sliding structure and a hydraulic cylinder lifting structure. It can achieve both remote automated high-precision synchronous lifting from the control room and mechanical lifting, meeting the personalized needs of oilfield operators. It assists on-site operators in more conveniently installing wellhead equipment, reducing installation risks and workload for on-site installers, and effectively solving the problems of low efficiency and high risk in oil and gas wellhead operations.

[0051] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the drawings shown and described herein.

Claims

1. A lifting-type well control skid device for coiled tubing operations, characterized in that, The device includes a skid base, with a support frame for installing an injection head mounted in the center. A lifting mechanism connects the bottom of the support frame to the inner bottom of the skid base, allowing for lifting and temporary fixing of the support frame. Inside the skid base, a clamp is installed on one side of the support frame, and a blowout preventer (BOP) projectile pin is installed on the other side. The clamp is used to limit the installation of the BOP assembly, and the BOP projectile pin is used to position and install the BOP assembly. A BOP box mounting base is fixed to the inner bottom of the skid base below the support frame, with the BOP box connected upwards. Lugs for hoisting are symmetrically connected at the top corners of both the skid base and the support frame. Operating platforms are installed on the top surfaces of both the skid base and the support frame. Ladders connecting to the corresponding operating platforms are installed on the sides of both the skid base and the support frame.

2. The lifting well control skid device as described in claim 1, characterized in that, The lifting structure includes: The upper column is symmetrically connected downwards to the bottom of the support frame and is located on the outside of the blowout preventer box; The lower column is arranged adjacent to each upper column on the outside of the blowout preventer box. The bottom of the lower column is fixedly connected to the bottom of the pry bar. The lower column and the upper column are respectively provided with pin holes. When the corresponding pin holes are on the same horizontal line, a pin shaft is detachably inserted into them. The height of a pair of upper columns relative to the lower column is temporarily fixed. The sliding mechanism includes a pair of baffles parallel to each other on both sides of the lower column and the upper column. The inner side of the baffles is fixed to the upper column with a sliding plate. A roller is connected between the ends of the pair of baffles on the same side in the horizontal direction through a bushing. The roller rolls up and down against the outer side of the upper column. The pair of baffles on the other side in the horizontal direction is fixedly connected to the upper end of the lower column. The hydraulic cylinder is symmetrically arranged on the outside of the lower column and vertically connected between the pry bar and the bottom of the support frame.

3. The lifting well control skid device as described in claim 1, characterized in that, A tilting pedal is hinged to the side of the pry bar near the blowout preventer assembly or blowout preventer pipe assembly, and a stop block is connected to the bottom of the tilting pedal to support the lower limit of the tilting pedal's rotation. A limit hole is opened on the top of the tilting pedal, and a bolt hole is provided on the side of the pry bar corresponding to the limit hole of the tilting pedal. By screwing a bolt into both the limit hole and the bolt hole, the tilting pedal is temporarily fixed in a vertical state.

4. The lifting well control skid device as described in claim 1, characterized in that, The bottom of the pry bar is equipped with a drainage groove, and a drainage plug is installed on the drainage groove.

5. The lifting well control skid device as described in claim 1, characterized in that, The blowout preventer mounting base includes a lower flange seat welded to the skid base, an upper flange seat connected upwards to the lower flange seat by bolts, a union plug welded to the upper end of the upper flange seat, and a blowout preventer connected to the upper end of the union plug.

6. The lifting well control skid device as described in claim 1, characterized in that, The operating platform is equipped with a guardrail socket at the top corner, and guardrails are connected to the support frame around the perimeter via the guardrail sockets. A kick plate is installed at the bottom of the guardrails, and a passageway is provided in the guardrails at the ladder position.

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