A coiled pipe laying device, system and method for deep-sea applications

Abstract

This application proposes a coiled tube laying device, system, and method for deep-sea applications. The coiled tube laying device includes a drum unit, a guide unit, a displacement unit, and an axial displacement control system. The displacement unit includes a frame, a hydraulic cylinder, and the axial displacement control system. The drum unit includes a cylindrical structure for winding the coiled tube and a drum rotation drive system for driving the cylindrical structure to rotate. The guide unit is mounted on the frame and surrounds the drum unit. The displacement control system includes an absolute encoder, a displacement sensor, and a controller. The controller is connected to the absolute encoder and the displacement sensor, respectively, and is used to correlate the number of coiled tube release turns with the axial displacement of the hydraulic cylinder, so that for each coiled tube release turn, the axial displacement of the hydraulic cylinder is equal to the diameter of the coiled tube. This application enables automatic coiled tube laying in deep-sea environments.

Description

Technical Field

[0001] This application relates to the field of marine oil equipment technology, specifically to a continuous pipe laying device, system, and method for use in deep sea. Background Technology

[0002] Coiled tubing, also known as flexible tubing, and coiled tubing installation machines are hailed as "all-purpose equipment," widely used in well workover, production enhancement, and drilling. In recent years, the application of coiled tubing technology and equipment has expanded to deeper, ultra-deep, unconventional, new energy, and deep-sea environments, with increasingly significant improvements in workload and efficiency. Due to its advantages such as low pollution, small footprint, and ability to operate under pressure, coiled tubing installation machines are considered "all-purpose machines" and are indispensable engineering tools in oil and gas field exploration and development.

[0003] A coiled tubing installation system mainly consists of key components such as an injection head, control chamber, drum, and coiled tubing. The drum assembly is primarily used for transporting the coiled tubing and for tubing arrangement during the installation process. The coiled tubing needs to be neatly arranged on the drum assembly during tripping. The injection head mainly provides power for tripping the coiled tubing. Currently, most common drum-based coiled tubing systems use a mechanical screw drive system, where the drum rotation drives the screw rotation, and the tubing trolley slides left and right with the screw to complete the tubing arrangement. For ease of operation, there is often a distance between the injection head and the tubing arrangement device to smoothly guide the coiled tubing downhole.

[0004] However, for oil well exploration in complex application scenarios, conventional tubing systems are difficult to adapt to the complex application environment due to limited working space and visual information acquisition, as well as large variations in external pressure. In order to better expand the application scope of coiled tubing technology and improve the efficiency of coiled tubing operations, it is urgent to carry out research on automatic coiled tubing technology for different environments. Summary of the Invention

[0005] To address the problem that coiled tube equipment cannot be laid out using conventional terrestrial methods in deep-sea environments, and to achieve automated coiled tube laying in deep-sea environments, this application proposes a coiled tube laying device, system, and method for deep-sea applications, employing the following technical solution:

[0006] In the first aspect, this application discloses a continuous pipe laying device for deep sea applications, the continuous pipe laying device including a drum unit, a guide unit, a displacement unit and an axial displacement control system;

[0007] The displacement unit includes a frame, a hydraulic cylinder, and an axial displacement control system. The hydraulic cylinder is used to drive the roller unit to move in a direction parallel to its central axis.

[0008] The roller unit includes a cylindrical structure for winding a continuous tube and a roller rotation drive system for driving the cylindrical structure to rotate, the cylindrical structure being mounted on the frame;

[0009] The drum rotation drive system includes a hydraulic oil tank, a drum hydraulic pump, a drum rotation drive component, and a first compensator. The hydraulic oil tank is connected to the first compensator, and the drum hydraulic pump is connected to the hydraulic oil tank and the drum rotation drive component, and is used to provide power hydraulic oil to the drum rotation drive component to drive the cylindrical structure to rotate.

[0010] The guide unit is mounted on the frame and surrounds the roller unit above it, and is used to guide the continuous tube along the cylindrical structure in the direction to be lowered.

[0011] The axial displacement control system includes an absolute encoder, a displacement sensor, and a controller;

[0012] The absolute encoder is installed at the end of the central shaft of the drum and is used to identify the position of each layer and each turn of the continuous tube on the drum body in order to obtain the number of continuous tube release turns.

[0013] The displacement sensor is connected to the hydraulic cylinder and is used to obtain the axial displacement of the hydraulic cylinder;

[0014] The controller is connected to the absolute encoder and the displacement sensor respectively, and is used to associate the number of continuous tube release turns with the axial displacement of the hydraulic cylinder, so that the axial displacement of the hydraulic cylinder is one continuous tube diameter for each continuous tube release turn.

[0015] Optionally, the guiding unit includes a multi-axis rotating pressure box, a guide rail, and a hydraulic pressure box;

[0016] The multi-axis rotating pressure box is located outside the cylindrical structure and can rotate axially around the central axis parallel and perpendicular to the cylindrical structure to accommodate a continuous tube with a deflection angle, and is used to guide the continuous tube along the cylindrical structure around the guide rail; the guide rail surrounds the roller unit above and is used to guide the continuous tube along the cylindrical structure in the direction to be lowered; the hydraulic pressure box is used to confine the continuous tube within the guide rail.

[0017] Optionally, the multi-axis rotating pressure box includes a bracket, a first pin, a swinging part, and a second pin. The bracket is mounted on the frame via the first pin and can swing around the first pin to adjust the winding direction of the continuous tube. The swinging part is mounted on the bracket via the second pin and can swing around the second pin to adjust the winding direction of the continuous tube.

[0018] Optionally, the guide unit support is provided with a sliding component, which allows the guide component to move axially along the roller unit under the action of the sliding component.

[0019] Optionally, the guide rail is a grooved track surrounding the top of the roller unit, the guide rail is fixed to the frame, and at least one hydraulic pressure box is provided on the guide rail;

[0020] The hydraulic pressure box includes a hydraulic drive assembly and a limiting component. The limiting component cooperates with the groove of the guide rail to limit the continuous tube.

[0021] Optionally, the frame of the displacement unit is provided with a sliding component; wherein:

[0022] The frame is provided with a sliding groove, and the sliding component is a slider with a sliding rail; or the frame structure is provided with a sliding rail, and the sliding component is a slider with a sliding groove.

[0023] The roller unit is connected to the slider. Through the cooperation of the slide groove and the slide rail, the hydraulic cylinder can push the slider to move. Under the drive of the slider, the roller unit can move along the axial direction of the cylindrical structure, so that the roller unit can slide relative to the frame.

[0024] Optionally, the roller rotation drive system further includes a reducer and a second compensator connected to the reducer. The reducer is connected to the roller rotation drive component and is used to reduce the speed and increase the torque of the roller rotation drive component.

[0025] In a second aspect, this application discloses a continuous tube operation system, including: a system support, an injection head, and a continuous tube stacking device as described in the first aspect;

[0026] The injection head and continuous tubing assembly are mounted on the system support.

[0027] The cylindrical structure of the continuous tube winding device is used to wind the continuous tube, and the guide unit guides the continuous tube along the cylindrical structure toward the injection head.

[0028] Optionally, the injection head includes a lifting and lowering clamping device and a flared mouth;

[0029] The flared nozzle is located at the top of the injection head and is used to guide the continuous tube into the lifting and lowering clamping device;

[0030] The lifting and lowering clamping device is used to drive the continuous tube upward or downward to lift and lower the continuous tube.

[0031] Thirdly, this application also discloses a method of using the continuous tube operating system as described in the second aspect, comprising:

[0032] An absolute encoder is used to identify the position of each layer and each revolving of the continuous tube on the roller body in order to obtain the number of continuous tube release revolves.

[0033] The controller controls the corresponding displacement of the hydraulic cylinder according to the number of continuous tube releases, so that the distance the cylindrical structure moves is exactly equal to the outer diameter of the oil pipe for each continuous tube release.

[0034] The free end of the continuous tube wound around the cylindrical structure passes through the multi-axis rotating pressure box of the guide unit and winds along the guide rail toward the injection head;

[0035] The free end of the continuous tubing passes through the lifting and lowering clamping device of the injection head and is lowered into the wellbore.

[0036] Fourthly, this application also discloses the application of a continuous pipe laying device as described in the first aspect in the deep sea.

[0037] Based on the above technical solution, the beneficial effects of this application compared with the prior art are as follows:

[0038] The coiled tubing laying device applied in this embodiment of the application for deep sea uses a guide unit that is installed on the same frame as the drum unit and surrounds the drum unit above the drum unit. This reduces the installation distance between the drum unit and the injection head, allowing for accurate introduction of the coiled tubing into the injection head even within a limited space, thus reducing the requirements for installation space. Simultaneously, an underwater hydraulic compensation drive system is used to drive the drum rotation, enabling the laying device to better adapt to significant changes in external pressure. Furthermore, encoders and sensors are used to correlate the rotation angle of the drum unit with the displacement distance of the displacement unit, improving the efficiency of coiled tubing take-up and laying on the drum. Therefore, the laying device is suitable for deep-sea seabed laying operations. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural diagram of the continuous tube roller device in the embodiments of this application;

[0040] Figure 2 This is a front view of the continuous tube roller device in the embodiments of this application;

[0041] Figure 3 for Figure 1 Enlarged view of region A in the middle;

[0042] Figure 4 This is a three-dimensional structural diagram of the multi-axis rotating pressure box in the embodiments of this application;

[0043] Figure 5 Explanation of reference numerals in the schematic diagram of the continuous tube operating system in the embodiments of this application:

[0044] Figure 6 This is a schematic diagram of the drum rotation drive system in an embodiment of this application;

[0045] Figure 7This is a flowchart illustrating the usage method of the continuous tube operation system in the embodiments of this application;

[0046] 1. Roller unit; 2. Displacement unit; 3. Guide unit; 4. Continuous tube; 5. Injection head;

[0047] 101. Cylindrical structure; 102. Roller rotation drive system; 103. Roller support; 201. Frame; 202. Hydraulic cylinder; 301. Multi-axis rotating pressure box; 302. Guide rail; 303. Hydraulic pressure box;

[0048] 311. Bracket; 312. First pin; 313. Swinging part; 314. Second pin;

[0049] 51. Trumpet mouth; 52. Lifting and lowering clamping device;

[0050] 61. Absolute encoder; 62. Displacement sensor. Detailed Implementation

[0051] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0052] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0053] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure 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, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0055] As human exploration and utilization of oil and gas resources deepens, oil and gas exploration and development have shifted from land to the ocean. Therefore, oil extraction operations must also be carried out in the vast ocean. The inventors discovered that currently, offshore oil and gas drilling is typically conducted using deep-sea drilling platforms, which are equipped with multiple drilling rigs for drilling operations. However, due to differences in equipment deployment, limited visual information acquisition, and underwater high pressure, conventional pipelining systems cannot adapt to the underwater environment. Specifically, in the deep-sea environment, coiled tubing equipment typically cannot be laid out using conventional land-based methods.

[0056] To address the problem that coiled tube equipment cannot be laid out in the conventional terrestrial manner in deep-sea environments, and to achieve automatic coiled tube laying in deep-sea environments, supporting the application of coiled tube technology in deep-sea environments, this application provides a coiled tube laying device, system, and method for deep-sea applications. One or more embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings.

[0057] Firstly, this application discloses a continuous pipe laying device for deep-sea applications, referring to... Figure 1The continuous tube laying device includes a roller unit 1, a displacement unit 2, a guide unit 3, and an axial displacement control system. The displacement unit 2 includes a frame 201, a hydraulic cylinder 202, and an axial displacement control system. The hydraulic cylinder 202 is used to drive the roller unit 1 to move in a direction parallel to its central axis. The roller unit 1 includes a cylindrical structure 101 for winding the continuous tube 4 and a roller rotation drive system 102 for driving the cylindrical structure 101 to rotate. The cylindrical structure 101 is mounted on the frame 201. The guide unit 3 is mounted on the frame 201 and surrounds the roller unit 1 to guide the continuous tube 4 along the cylindrical structure 101 in the direction to be lowered. The displacement control system includes an axial displacement control system comprising an absolute encoder 61, a displacement sensor 62, and a controller. The absolute encoder 61 is mounted on the end of the central shaft of the cylindrical structure 101 and is used to identify the position of each layer and each turn of the continuous tube on the cylindrical structure 101 to obtain the number of continuous tube release turns. The displacement sensor 62 is connected to the hydraulic cylinder and is used to obtain the axial displacement of the hydraulic cylinder. The controller is connected to the absolute encoder 61 and the displacement sensor 62 respectively and is used to correlate the number of continuous tube release turns with the axial displacement of the hydraulic cylinder, so that the axial displacement of the hydraulic cylinder is one continuous tube diameter for each continuous tube release turn.

[0058] In some alternative embodiments, refer to Figure 1 The roller unit 1 also includes a roller support 103, which is mounted on the frame 201. A cylindrical structure 101 is further mounted on the roller support 103 and rotates around its central axis under the drive of the roller rotation drive system 102. The cylindrical structure 101 is a welded steel structure used for winding and storing the continuous tube 4 for operation. The roller rotation drive system 102 provides power to support the rotation of the cylindrical structure 101, enabling the roller unit 1 to wind / unwind the continuous tube 4.

[0059] The coiled tubing laying device applied in this embodiment of the application for deep sea uses a guide unit 3. By adjusting the installation position of the guide unit 3, it is installed on the same frame 201 as the drum unit 1 and surrounds the drum unit 1, reducing the installation distance between the drum unit 1 and the injection head 5. This allows the coiled tubing 4 to be accurately guided into the injection head 5 even within a limited space, reducing the requirements for installation space. At the same time, the drum rotation is driven by an underwater hydraulic compensation drive system, which makes the laying device better adapt to huge changes in external pressure. The absolute encoder 61 and displacement sensor 62 are used to correlate the rotation angle of the drum unit and the displacement distance of the displacement unit 2, thereby improving the efficiency of coiled tubing take-up and laying on the drum. As a result, the laying device is suitable for deep-sea seabed laying operations.

[0060] In an optional embodiment, the displacement unit 2 is installed at the lower end of the drum unit 1 and is a frame structure composed of steel structural components and a hydraulic cylinder 202. When the continuous tube 4 exits from the drum unit 1, the displacement unit 2 moves in coordination with the rotational speed of the drum, guiding the continuous tube 4 into the guide unit 3 in an orderly manner and connecting it to other continuous tube 4 working devices.

[0061] Specifically, refer to Figure 1 The hydraulic cylinder 202 is fixedly mounted on the frame 201 at both ends and connected to the roller unit 1 via a flange. The position of each layer and each turn of the continuous tube 4 on the cylindrical structure 101 has a unique correspondence with the absolute encoder 61, which is mounted on the shaft end of the cylindrical structure 101. The absolute encoder 61 can acquire the rotation angle of the cylindrical structure 101 in real time to determine the number of turns of continuous tube 4 released. The displacement sensor 62 can be mounted on the hydraulic cylinder 202 or the frame 201. The displacement sensor 62 can adjust the extension amount of the hydraulic cylinder 202 according to the rotation angle of the cylindrical structure 101 of the roller unit 1. Each rotation of the cylindrical structure 101 requires an axial displacement of one diameter of the continuous tube 4. This ensures that the continuous tube 4 is neatly and orderly wound into / out of the cylindrical structure 101, guaranteeing that the continuous tube 4 is neatly arranged when entering and exiting the roller unit, thereby reducing the interaction force between the continuous tubes 4 and extending their lifespan. Since the rotation of the drum and the axial displacement of the drum unit 1 are no longer connected by mechanical transmission, the requirements for installation space are further reduced, making the device more adaptable to the deep-sea underwater working environment.

[0062] In some alternative embodiments, refer to Figure 1 The frame 201 of displacement unit 2 is equipped with a sliding component. A sliding groove can be provided on the frame 201, and the sliding component is a slider with a sliding rail; alternatively, a sliding rail can be provided on the frame 201 structure, and the sliding component is a slider with a sliding groove. The roller unit 1 is connected to the slider. Through the cooperation of the sliding groove and the sliding rail, the hydraulic cylinder 202 can push the slider to move. Under the drive of the slider, the roller unit 1 can move along the axial direction of the cylindrical structure 101, allowing the roller unit 1 to slide relative to the frame 201. The frame 201 is welded from steel structural components.

[0063] In an alternative embodiment, refer to Figures 1-4The guide unit 3 is mounted on the frame 201. The guide unit 3 includes a multi-axis rotating pressure box 301, a guide rail 302, and a hydraulic pressure box 303. The multi-axis rotating pressure box 301 is located outside the cylindrical structure 101 and can rotate axially about the central axis parallel to and perpendicular to the cylindrical structure 101 to accommodate the continuous tube 4 with a deflection angle. It is used to guide the continuous tube 4 around the guide rail 302 along the cylindrical structure 101. The guide rail 302 surrounds the roller unit 1 and is used to guide the continuous tube 4 around the cylindrical structure 101 in the direction to be lowered. The hydraulic pressure box 303 is used to confine the continuous tube 4 within the guide rail 302.

[0064] The aforementioned pipe-laying device can be used in deep-sea environments or similar confined spaces. The drum unit 1 winds the continuous pipe 4, the displacement unit 2 hydraulically guides the continuous pipe 4 for neat arrangement, and the guide unit 3 hydraulically guides the continuous pipe 4 to surround the drum. The device's structure overcomes the flexibility of the continuous pipe 4, allowing it to pass smoothly through the drum device and other continuous pipe 4 operating devices, ensuring normal operation of the continuous pipe 4.

[0065] In some alternative embodiments, refer to Figure 1 The guide unit 3 is installed around the drum unit 1, serving as a channel for the continuous tube 4 to guide the continuous tube 4 into and out of the drum device and to connect with other continuous tube 4 operating devices. The multi-axis rotating pressure box 301 can rotate around two axes to receive the continuous tube 4 within a certain deflection angle, guide the continuous tube 4 into the guide rail 302, and restrict the movement of the continuous tube 4 within the guide rail 302 by the hydraulic pressure box 303.

[0066] Specifically, refer to Figure 3 and Figure 4 The multi-axis rotating pressure box 301 includes a bracket 311, a first pin 312, a swinging part 313, and a second pin 314. The bracket 311 is mounted on the frame 201 via the first pin 312 and can swing around the first pin 312 to adjust the winding direction of the continuous tube 4. The swinging part 313 is mounted on the bracket 311 via the second pin 314 and can swing around the second pin 314 to adjust the winding direction of the continuous tube 4.

[0067] In some alternative embodiments, the support 311 is provided with a sliding assembly, under the action of the sliding assembly, the multi-axis rotating pressure box 301 can move in a direction parallel to the central axis of the cylindrical structure 101 of the roller body unit 1.

[0068] Reference Figure 1 and Figure 3The multi-axis rotating pressure box 301 is installed on the opposite side of the roller unit 1 (with the direction of the working wellhead as positive). The bracket 311 is installed on the frame 201 through the first pin 312. The bracket 311 can rotate around the first pin 312. The swing part 313 is installed on the bracket 311 through the second pin 314. The swing part 313 can rotate around the second pin 314. The swing part 313 is provided with a continuous tube 4 hole. The continuous tube 4 can pass through the continuous tube 4 hole and rotate around the guide rail 302. The multi-axis rotating pressure box 301 can adjust the rotation direction of the continuous tube 4 within a certain range.

[0069] In some optional embodiments, the guide rail 302 is a grooved track surrounding the roller unit 1. The guide rail 302 is fixed to the frame 201, and at least one hydraulic pressure box 303 is provided on the guide rail 302. The hydraulic pressure box 303 includes a hydraulic drive component and a limiting member. The limiting member cooperates with the groove of the guide rail 302 to limit the continuous tube 4. Multiple hydraulic pressure boxes 303 can be provided along the guide rail 302. Each hydraulic pressure box 303 can include a hydraulic drive component and a limiting member, or multiple hydraulic pressure boxes 303 can share a single hydraulic drive component. The limiting member installed on the guide rail 302 can cover the groove of the guide rail 302, so that the continuous tube 4 is confined in the groove. The limiting member can be a limiting plate or a limiting groove plate. It can be fixedly installed on the guide rail 302, or one end can be rotatably connected to the guide rail 302, and the other end can be locked to the guide rail 302.

[0070] The aforementioned coiled tubing device uses a roller unit 1 to wind and place the coiled tubing 4. The direction of the coiled tubing 4 can be adjusted by the multi-axis rotating pressure box 301 in the guide unit 3, so that the coiled tubing 4 winds around the guide rail 302 and enters the groove of the guide rail 302. The hydraulic pressure box 303 cooperates to restrict the coiled tubing 4 in the groove. The guide rail 302 guides the coiled tubing 4 to the direction of the wellhead to be lowered, such as the well casing to be lowered. This reduces the installation distance between the coiled tubing device and the injection head 5, and can accurately guide the coiled tubing 4 into the injection head 5 even in a limited space. This coiled tubing 4 roller is suitable for tubing lowering operations in confined spaces and is well applicable to applications such as offshore platforms. It reduces the requirements for installation space and improves versatility and universal applicability.

[0071] like Figure 1 and Figure 2 As shown, the guide rail 302 is mounted above the roller unit 1, surrounding and covering the upper half of the roller unit 1. The guide rail 302 is arc-shaped, and preferably, the guide rail 302 is coaxial with the cylindrical structure 101 of the roller unit 1. The guide rail 302 can be fixedly mounted on the frame 201, or it can be slidably mounted on the frame 201, such as... Figure 1As shown, the frame 201 has multiple crossbars above the drum unit 1. The guide rail 302 can be fixedly connected to the crossbars, or it can be slidably connected to each crossbar and slide along the crossbars. The guide rail 302 can guide the continuous tube 4 to rotate around the drum unit 1 and move towards the wellhead injection direction.

[0072] Secondly, the continuous tube operating system provided in the embodiments of the present invention has the following structure: Figure 5 As shown, it includes: a system support (not shown in the figure), an injection head 5, and a continuous tube assembly device; in the system installation state: the injection head 5 and the continuous tube assembly device are installed on the system support, and the cylindrical structure 101 of the continuous tube assembly device is used to wind the continuous tube 4. The continuous tube 4 passes through the multi-axis rotating pressure box 301 and, with the cooperation of the guide rail 302 and the hydraulic pressure box 303, winds along the guide rail 302 toward the injection head 5.

[0073] In an optional embodiment, the injection head 5 includes a lifting and lowering clamping device 52 and a bell mouth 51. The bell mouth 51 is located on the upper part of the injection head 5 to guide the continuous tube 4 into the lifting and lowering clamping device 52. The lifting and lowering clamping device 52 is used to drive the continuous tube 4 upward or downward to lift and lower the continuous tube 4. Figure 5 As shown, the flare 51 is installed on the top of the injection head 5 to guide the continuous tube 4 at different angles into the injection head 5, and the lifting and clamping device 52 is installed inside the injection head 5 to drive the continuous tube 4 to move downward / upward.

[0074] In an alternative embodiment, refer to Figure 6 The drum rotation drive system 102 includes a hydraulic oil tank, a drum hydraulic pump, a drum rotation drive component, and a first compensator. The hydraulic oil tank is connected to the first compensator, and the drum hydraulic pump is connected to the hydraulic oil tank and the drum rotation drive component, providing hydraulic oil to the drum rotation drive component to drive the cylindrical structure 101 to rotate. It should be noted that the drum rotation drive component is specifically a drum motor. The specific driving method is as follows: the drum hydraulic pump is driven by a deep-sea motor, drawing oil from the hydraulic oil tank. The oil suction pressure is compensated by the first compensator connected to the hydraulic oil tank, forming pressurized oil that is then sent to the drum motor after system control and the drum valve assembly, further driving the cylindrical structure 101 to rotate.

[0075] In an alternative embodiment, refer to Figure 6The drum rotation drive system 102 also includes a reducer and a second compensator connected to the reducer. The reducer is connected to the drum rotation drive component and is used to reduce speed and increase torque for the drum rotation drive component. The drum motor, connected to the reducer, drives the drum to rotate after reduction and torque increase, realizing the winding and unwinding actions of the continuous tube 4. The deep-water motor and reducer are respectively adapted to the pressure compensation of the deep-water environment through the compensator, so that the drum rotation process can adapt to the high-pressure deep-water environment. The absolute encoder 61 is installed on the shaft end of the cylindrical structure 101, which can obtain the rotation angle of the cylindrical structure 101 of the drum unit in real time, thereby determining the number of turns of continuous tube 4 released.

[0076] Both the continuous tube assembly and the injection head 5 can be fixed on the system bracket. Since the continuous tube assembly can guide the continuous tube 4, the distance between them can be relatively close, such as adjacent or separated by a small distance, without the need for a large distance. Since both are fixed on the system bracket, the system bracket can be directly installed in the application environment, greatly reducing the requirements for installation space.

[0077] Thirdly, the method of using the continuous tube operating system provided in the embodiments of this application refers to... Figure 7 ,include:

[0078] S101: Use absolute encoder 61 to identify the position of each layer and each turn of continuous tube 4 on the roller body in order to obtain the number of turns of continuous tube 4 released.

[0079] S102: Based on the number of release turns of the continuous tube 4, the corresponding displacement of the hydraulic cylinder 202 is adjusted by the controller so that the distance moved by the cylindrical structure 101 is exactly equal to the outer diameter of the oil pipe for each release turn of the continuous tube 4.

[0080] S103: The free end of the continuous tube 4 wound on the cylindrical structure 101 passes through the multi-axis rotating pressure box 301 of the guide unit 3 and winds along the guide rail 302 toward the injection head 5;

[0081] S104: The free end of the continuous tube 4 passes through the lifting and lowering clamping device 52 of the injection head 5 and is lowered into the wellbore.

[0082] This invention also provides an application of a continuous pipe laying device in the deep sea.

[0083] When the above-mentioned operating system operates on the coiled tube 4, it first sets the absolute encoder 61 and displacement sensor 62 through the corresponding control program to correlate the number of coiled tube 4 release turns with the axial displacement length of the roller unit 1, so that the distance moved by the cylindrical structure 101 for each release of the coiled tube 4 is exactly equal to the outer diameter of the tubing. Then, the system support equipped with the coiled tube routing device and the injection head 5 is placed at the deep seabed. After the coiled tube 4 exits from the cylindrical structure 101, it enters the coiled tube 4 channel on the multi-axis rotating pressure box 301, and then winds along the guide rail 302 in the injection direction. It is connected to the injection head 5 through the bell mouth 51, and the operation begins under the action of the clamping device 52.

[0084] The coiled pipe laying device described in this embodiment of the invention enables coiled pipe laying operations at the deep seabed without the need for conventional coiled pipe laying methods involving coiled pipe rollers and injection heads 5. This avoids situations where insufficient platform working area prevents the coiled pipe 4 from being smoothly connected to the injection head 5. The coiled pipe 4's flexibility is overcome by its encircling the outer ring of the roller, allowing for installation within a limited working area, thus facilitating further coiled pipe operations. This system saves the platform area required for coiled pipe operations and reduces reliance on large-tonnage cranes. It enhances the ability of coiled pipe equipment to adapt to high-pressure deep-sea environments, promoting the development of coiled pipe technology across multiple fields and enabling its application in high-pressure deep-sea environments, thereby contributing to the development of offshore oil and gas resources.

[0085] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," just as "comprising" is interpreted as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A continuous pipe laying device for deep-sea applications, characterized in that, The drum body unit, the guide unit, the displacement unit and the axial displacement control system are included. The displacement unit includes a frame, a hydraulic cylinder and an axial displacement control system, and the hydraulic cylinder is used to drive the drum body unit to move along the direction parallel to the central axis thereof. The drum body unit includes a cylindrical structure for winding the continuous pipe and a drum rotation driving system for driving the cylindrical structure to rotate, and the cylindrical structure is mounted on the frame. The drum rotation driving system includes a hydraulic oil tank, a drum hydraulic pump, a drum rotation driving member, a first compensator, a speed reducer, and a second compensator connected with the speed reducer. The hydraulic oil tank is connected with the first compensator, the drum hydraulic pump is connected with the hydraulic oil tank and the drum rotation driving member, and is used to provide power hydraulic oil to the drum rotation driving member to drive the cylindrical structure to rotate. The guide unit is mounted on the frame and surrounds the drum body unit, and is used to guide the continuous pipe to rotate along the cylindrical structure to the direction to be lowered. The axial displacement control system includes an absolute value encoder, a displacement sensor and a controller. The absolute value encoder is mounted on the end of the drum central axis, is used to identify the position of each layer and each circle of the continuous pipe on the drum body, and is used to obtain the release circle number of the continuous pipe. The displacement sensor is connected with the hydraulic cylinder, is used to obtain the axial displacement amount of the hydraulic cylinder. The controller is connected with the absolute value encoder and the displacement sensor respectively, is used to associate the release circle number of the continuous pipe with the axial displacement amount of the hydraulic cylinder, and is used to make the axial displacement amount of the hydraulic cylinder be a continuous pipe diameter when the continuous pipe releases one circle. The guide unit includes a multi-axis rotating pressure box, a guide rail and a hydraulic pressure box. The multi-axis rotating pressure box is located outside the cylindrical structure, can rotate along the axial direction parallel and perpendicular to the central axis of the cylindrical structure, is used to adapt to the continuous pipe with a deflection angle, and is used to guide the continuous pipe to rotate along the cylindrical structure to the guide rail. The guide rail surrounds the drum body unit, is used to guide the continuous pipe to rotate along the cylindrical structure to the direction to be lowered. The hydraulic pressure box is used to limit the continuous pipe in the guide rail. The guide rail is coaxial with the cylindrical structure of the drum body unit, is slidingly mounted on the frame, and is a groove rail surrounding the drum body unit. The guide rail is provided with at least one hydraulic pressure box. The hydraulic pressure box includes a hydraulic driving assembly and a limiting piece. The limiting piece cooperates with the groove of the guide rail to limit the continuous pipe. The frame is provided with a sliding groove, and the sliding assembly is a sliding block with a sliding rail. Or the frame is provided with a sliding rail, and the sliding assembly is a sliding block with a sliding groove. The drum body unit is connected with the sliding block, and the hydraulic cylinder can drive the sliding block to move through the cooperation of the sliding groove and the sliding rail. The drum body unit can move along the axial direction of the cylindrical structure under the driving of the sliding block, so that the drum body unit can slide relative to the frame.

2. The coiled tubing tubing string apparatus of claim 1, wherein, The multi-axis rotating pressure box comprises a support, a first pin shaft, a swing part and a second pin shaft, the support is installed on the frame through the first pin shaft and can swing around the first pin shaft to adjust the winding direction of the coiled tubing; the swing part is installed on the support through the second pin shaft and can swing around the second pin shaft to adjust the winding direction of the coiled tubing.

3. A coiled tubing operations system characterized by, The system support, the injection head and the coiled tubing pipe arrangement according to any one of claims 1-2 are included. The injection head and the coiled tubing pipe arrangement are installed on the system support, The cylindrical structure of the coiled tubing pipe arrangement is used for winding the coiled tubing, and the guide unit guides the coiled tubing to wind around the injection head along the cylindrical structure. The injection head comprises a lifting and lowering clamping device and a trumpet mouth.

4. The coiled tubing system of claim 3, wherein, The trumpet mouth is located at the upper part of the injection head and is used for guiding the coiled tubing into the lifting and lowering clamping device. The lifting and lowering clamping device is used for driving the coiled tubing to run upward or downward to realize the lifting and lowering of the coiled tubing. The system support, the injection head and the coiled tubing pipe arrangement according to any one of claims 1-2 are included.

5. A method of using a coiled tubing system as claimed in any of claims 3-4, characterized in that, The absolute value encoder is used to identify the position of each layer and each turn of the coiled tubing on the drum body to obtain the released turn number of the coiled tubing; The controller controls the corresponding displacement amount of the hydraulic cylinder according to the released turn number of the coiled tubing, so that the distance moved by the cylindrical structure is exactly equal to the outer diameter of the oil pipe when the coiled tubing releases one turn; The free end of the coiled tubing wound on the cylindrical structure is led out of the multi-axis rotating pressure box of the guide unit and is wound along the guide rail to the injection head; The free end of the coiled tubing passes through the lifting and lowering clamping device of the injection head and is lowered into the wellbore.

6. The application of the coiled tubing pipe arrangement according to any one of claims 1-2 in deep sea. ​

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