Welding axial and rotary motion system under special cylindrical coordinate system in shaft

Abstract

The invention relates to the field of oil fields, in particular to a welding axial and rotary motion system under a special cylindrical coordinate system in a shaft. A welding axial and rotary motion system under a special cylindrical coordinate system in a shaft comprises a temperature and pressure measuring system, an annular rotating system, an axial motion system and a downhole tool protection shell, the temperature and pressure measuring system is used for reading temperature and pressure data of an operation section in real time and transmitting the read data back to the ground through a cable, and the annular rotating system is used for rotating the axial motion system in the downhole tool protection shell. The reference is provided for ground operators; the circumferential rotation system is used for controlling the overall circumferential rotation of the downhole tool; the axial movement system is used for controlling the downhole tool to move in the axial direction of the tool string. The underground tool protection shell is used for protecting all underground working mechanisms, supporting and connecting the whole system and achieving sealing between the underground working mechanisms. The module is based on full-electric-control transmission and a modular framework, and can achieve high-precision axial feeding and annular rotating motion under the extreme well conditions of high temperature, high pressure and the like.

Description

Technical Field

[0001] This invention relates to the field of oil fields, and more specifically to a welding axial and rotary motion system in a special cylindrical coordinate system for wellbore. Background Technology

[0002] In the field of oilfield downhole operations, precise downhole control is a key technological support for enhancing oil recovery, implementing complex well workovers, and achieving efficient logging. Currently, advanced processes such as precise perforation, pinpoint cutting, and targeted repair all heavily rely on downhole tools being able to stably and reliably perform multi-degree-of-freedom composite motions of axial feed and circumferential rotation in the harsh wellbore environment of high temperature, high pressure, and strong vibration.

[0003] However, existing equipment for achieving such movements mostly relies on hydraulic drives or split-type electromechanical structures. Hydraulic solutions suffer from inherent drawbacks such as sluggish system response, complex sealing structures, and susceptibility to failure under extreme temperatures, making it difficult to guarantee control accuracy and stability. While split-type mechanical transmission solutions avoid some of the drawbacks of hydraulic systems, they suffer from loose structures, low integration, and difficulty in achieving precise coordination between two degrees of freedom of motion within the confined space of the wellbore. These technological bottlenecks collectively lead to the common problems of insufficient operational reliability, large trajectory deviations, and poor environmental adaptability in existing downhole tools.

[0004] Furthermore, due to the lack of standardized and modular basic motion platforms, downhole tools with different functions (such as logging tools, cutters, and packers) often require customized independent drive and transmission systems. This "single-function, single-design" approach not only leads to redundant investment of R&D resources and prolongs tool development cycles, but also significantly increases subsequent maintenance costs and operational complexity. Simultaneously, the lack of real-time, in-situ sensing capabilities of downhole tools regarding their surrounding physical fields (such as temperature and pressure) during operation makes it difficult for surface operators to obtain critical operating condition information and make timely adjustments, further amplifying operational risks.

[0005] Therefore, facing the ever-increasing demands for high precision, high efficiency, and high reliability in oilfield downhole operations, there is an urgent need for a novel technological solution. This solution must break through the limitations of existing transmission and control modes, constructing an integrated, fully electrically controlled, and perceptive standard motion platform to fundamentally improve the motion performance and intelligence level of downhole tools, and drive the entire industry towards standardization and modularization. Summary of the Invention

[0006] This invention aims to address the problems of low precision, poor reliability, and insufficient environmental adaptability in the coordinated control of axial and rotational motion in existing downhole tools. It provides a welding axial and rotational motion system in a dedicated cylindrical coordinate system within the wellbore. This module, based on a fully electrically controlled transmission and modular architecture, can achieve high-precision axial feed and circumferential rotational motion under extreme well conditions of high temperature and high pressure. After adaptive adjustments, its technical principles and system architecture can also be extended to structural reinforcement and leak repair operations in confined spaces of urban underground pipe networks, chemical and energy pipelines, demonstrating broad potential for technology transfer and significant industry application value.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] A welding axial and rotary motion system in a dedicated cylindrical coordinate system for wellbore operation includes a temperature and pressure measurement system, a circumferential rotation system, an axial motion system, and a downhole tool protective shell. The temperature and pressure measurement system is used to read the temperature and pressure data of the working section in real time and transmit the data back to the surface via cable for reference by surface operators. The circumferential rotation system is used to control the overall circumferential rotation of the downhole tool. The axial motion system is used to control the axial movement of the downhole tool along the tool string. The downhole tool protective shell is used to protect the various working mechanisms in the well, providing support and connection for the entire system, and sealing between the downhole working mechanisms.

[0009] Furthermore, the upper end of the temperature and pressure measurement system is connected to a continuous oil pipe via a thread, and the lower end is connected to a circumferential rotating system via a thread.

[0010] Furthermore, the circumferential rotation system includes an upper circumferential rotation short circuit and a lower circumferential rotation short circuit; excluding the motor part, the upper circumferential rotation short circuit and the lower circumferential rotation short circuit have similar functions but opposite directions; the upper circumferential rotation short circuit is driven by a hollow motor and is used to control the circumferential rotation of the axial motion system and the entire downhole tool; the lower circumferential rotation short circuit is used to assist in supporting the downhole tool and provide the degree of freedom for circumferential rotation.

[0011] Furthermore, the upper circumferential rotary short connector includes an upper central tube back cap, a circumferential rotary upper connector, an upper central tube, a hollow motor, a hollow motor protective shell, a hollow motor bracket, a circumferential coupling, an upper circumferential bearing assembly, and an upper circumferential bearing assembly protective shell.

[0012] The upper center tube back cap is connected to the upper center tube by threads, and serves to bear weight and limit movement.

[0013] The upper end of the circumferential rotary upper joint is connected to the temperature and pressure measurement system via a thread, and the lower end is connected to the hollow motor protective shell via a thread. The internal platform has an upper central tube mounting hole and four limit pin mounting holes. After the limit pins are installed, they can restrict the rotational freedom between the upper central tube and the circumferential rotary upper joint.

[0014] The upper central tube passes through the circumferential rotating upper joint, hollow motor, hollow motor bracket, circumferential coupling, and upper circumferential bearing assembly protective shell. The central tube has through holes for passing through control cables and inert displacement media pipelines. The two-stage shoulders at the lower end of the upper central tube are used to install the bearing assembly and bear the mass of the tool string below the axial motion system.

[0015] Furthermore, the hollow motor consists of an upper motor and a lower reducer, used to control the circumferential rotation of the downhole tool. The hollow motor is hollow as a whole to pass through the upper central tube, and the lower reducer has a wing plate with a light hole for mounting the motor. The output shaft is matched with a circumferential coupling.

[0016] The upper end of the hollow motor protective shell is connected to the circumferential rotating upper connector via a threaded connection, and the lower end is connected to the hollow motor bracket via a threaded connection, which serves as a connection.

[0017] The hollow motor bracket is used to seal the upper circumferential rotatable short circuit and allow the circumferential coupling to pass through. The upper end is connected to the hollow motor protective shell by a thread. A through hole is opened at the axis position of the part to allow the circumferential coupling to pass through.

[0018] The circumferential coupling is used to seal the upper end of the axial motion system and transmit the torque output by the hollow motor.

[0019] The upper circumferential bearing assembly is mounted on the upper central tube, and the outer ring fits with the inner hole of the upper circumferential bearing assembly protective shell to ensure that the axial motion system and downhole tools rotate smoothly along the tool string axis.

[0020] The upper end of the protective shell of the upper circumferential bearing assembly is connected to the circumferential coupling by a thread, and the lower end is connected to the axial moving sleeve by a thread, which serves to connect and protect the internal bearing assembly. The axis of the part has a through hole that allows the upper central tube to pass through.

[0021] Furthermore, the lower circumferential rotary short connector includes a lower central tube back cap, a lower circumferential bearing assembly, a lower circumferential bearing assembly protective shell, a lower central tube, a lower circumferential rotary sealing ring, and a circumferential rotary lower connector;

[0022] The lower end of the lower center tube back cap is connected to the lower center tube by a thread, which serves to bear weight and limit movement.

[0023] The lower circumferential bearing assembly is installed on the lower central tube, and the outer ring fits with the inner hole of the lower circumferential bearing assembly protective shell to ensure that the axial motion system and downhole tools rotate smoothly along the tool string axis.

[0024] The upper end of the lower circumferential bearing assembly protective shell is connected to the downhole tool protective shell by threads, and the lower end is connected to the lower circumferential rotary sealing ring by threads, which serves to connect and protect the internal bearing assembly.

[0025] Furthermore, the lower central tube passes through the lower circumferential rotating sealing ring and the circumferential rotating lower joint, and has a through hole at the axial position for passing through the control cable. The two-stage shoulders at the upper end are used to install the bearing assembly.

[0026] The upper end of the lower circumferential rotary sealing ring is connected to the protective shell of the lower circumferential bearing assembly by a thread, and a through hole is opened at the axial position to allow the lower central tube to pass through, which serves to fix and seal.

[0027] The upper end of the circumferential rotating lower connector is connected to the lower central tube by a thread, and the lower end is connected to the lower electric packer by a thread, thus serving as a connection.

[0028] Furthermore, the axial motion system includes an axial motion outer sleeve, an axial motor protective shell, an axial motor, an axial coupling, an axial coupling protective cover, an axial bearing short circuit, a tool protective shell adapter, a lead screw, a lead screw nut protective cover, and a nut connector.

[0029] The upper end of the axial motion sleeve is connected to the protective shell of the upper circumferential bearing assembly via threads, and the lower end is connected to the tool protective shell adapter via threads, thus serving a connecting function.

[0030] The upper end of the axial motor protective housing has a connector for passing through the cable control cable, and the lower end is connected to the axial coupling protective cover by a thread. The axial motor is located in the internal space of the housing, which is used to protect and fix the axial motor.

[0031] The axial motor is located inside the axial motor protective housing and is used to provide the original power for the axial movement of the downhole tool;

[0032] The axial coupling is located inside the protective cover of the axial coupling, and its upper and lower ends are connected to the axial motor and the lead screw, respectively, to transmit the output torque of the axial motor.

[0033] The upper end of the axial coupling protective cover is connected to the axial motor protective shell via threads, and the lower end is connected to the tool protective shell adapter and the axial bearing via threads. The axial coupling is located in its internal space, which serves to connect and protect the axial coupling.

[0034] Furthermore, the upper end of the axial bearing is connected to the axial coupling protective cover via a threaded connection, and the lower end is connected to the lead screw nut protective cover via a threaded connection. The internal bearing is sleeved on the lead screw to ensure that the lead screw coincides with the axis of the axial motion system and rotates smoothly.

[0035] The upper end of the tool protective shell adapter is connected to the axial motion outer sleeve and the axial coupling protective cover by a thread, and the lower end is connected to the downhole tool protective shell by a thread, which serves as a transition connection.

[0036] The lead screw is located inside the lead screw nut protective cover. Its upper end is connected to the axial coupling, and its lower threaded part is engaged with the lead screw nut joint. During operation, the axial coupling drives the lead screw to rotate in a circumferential direction, and the lead screw nut joint can move up and down along the axis to play a transmission role.

[0037] The upper end of the lead screw and nut protective cover is connected to the axial bearing via a threaded connection, which serves to protect the internal lead screw and nut joint.

[0038] The lead screw nut joint is located inside the lead screw nut protective cover and has a threaded through hole along the axis. Driven by the lead screw, it can move up and down along the axis. The lower end is connected to the downhole tool adapter through the thread. Four pin guides are opened on the outer circle side to limit the rotational freedom of the lead screw nut joint.

[0039] Furthermore, the upper end of the downhole tool protective housing is connected to the tool protective housing adapter via a thread, and the lower end is connected to the lower circumferential bearing assembly protective housing via a thread, which is used to achieve sealing between the downhole working mechanisms.

[0040] The beneficial effects of the welding axial and rotary motion system in a dedicated cylindrical coordinate system for wellbore installation of this invention are:

[0041] It achieves highly reliable motion control under complex downhole conditions. Through a highly integrated modular design and fully electric transmission, the axial feed and circumferential rotation systems are organically integrated, solving the problems of inaccurate movement and unstable control of traditional tools under high temperature, high pressure, and strong vibration environments, and significantly improving the accuracy and reliability of motion execution.

[0042] It provides a standardized and universal downhole motion platform. This module can be flexibly integrated into various downhole tool strings as a basic functional unit, such as logging, cutting, and repair tools, which greatly simplifies tool string design, reduces the development cycle and maintenance cost of special tools, and promotes the standardization and modularization of downhole operations.

[0043] The system's environmental adaptability and functional integration in confined spaces have been enhanced. Its compact design, while ensuring the wellbore diameter, integrates a real-time monitoring system for temperature and pressure measurement, providing crucial data for surface decision-making and comprehensively improving its overall adaptability to extreme well conditions. Attached Figure Description

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0045] Figure 1 This is a schematic diagram of the axial and rotational motion system in a dedicated cylindrical coordinate system inside the wellbore.

[0046] Figure 2 This is a schematic diagram of the upper ring-shaped rotary short-circuit structure;

[0047] Figure 3 This is a schematic diagram of the upper circumferential rotary short-circuit upper circumferential bearing assembly structure;

[0048] Figure 4 This is an exploded view of the upper ring-shaped rotatable short-circuit coupling.

[0049] Figure 5 This is a schematic diagram of the lower circumferential rotary short-circuit structure;

[0050] Figure 6 This is a schematic diagram of the axial motion system.

[0051] Figure 7 This is a schematic diagram of the lead screw structure in an axial motion system;

[0052] In the diagram: Temperature and pressure measurement system 1; Circumferential rotation system 2; Upper circumferential rotation short connector 2.1; Upper center tube back cap 2.1.1; Circumferential rotation upper connector 2.1.2; Upper center tube 2.1.3; Hollow motor 2.1.4; Hollow motor protective shell 2.1.5; Hollow motor bracket 2.1.6; Circumferential coupling 2.1.7; Upper circumferential bearing assembly 2.1.8; Upper circumferential bearing assembly protective shell 2.1.9; Lower circumferential rotation short connector 2.2; Lower center tube back cap 2.2.1; Lower circumferential bearing assembly 2. 2.2; Lower circumferential bearing assembly protective shell 2.2.3; Lower central tube 2.2.4; Lower circumferential rotary sealing ring 2.2.5; Circumferential rotary lower joint 2.2.6; Axial motion system 3; Axial motion outer sleeve 3.1; Axial motor protective shell 3.2; Axial motor 3.3; Axial coupling 3.4; Axial coupling protective cover 3.5; Axial bearing short connector 3.6; Tool protective shell adapter 3.7; Lead screw 3.8; Lead screw nut protective cover 3.9; Nut connector 3.10; Downhole tool protective shell 4. Detailed Implementation

[0053] The following is in conjunction with the appendix Figure 1-7 The present invention will be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer definition of the scope of protection of the present invention.

[0054] A welding axial and rotary motion system in a dedicated cylindrical coordinate system for wellbore installation includes a temperature and pressure measurement system 1, a circumferential rotation system 2, an axial motion system 3, and a downhole tool protective shell 4. The temperature and pressure measurement system 1 is used to read the temperature and pressure data of the working section in real time and transmit the data back to the surface via cable for reference by surface operators. The circumferential rotation system 2 is used to control the circumferential rotation of the entire downhole tool. The axial motion system 3 is used to control the axial movement of the downhole tool (except for the downhole tool protective shell 4) along the tool string. The downhole tool protective shell 4 is used to protect the various working mechanisms in the well, provide support and connection for the entire system, and achieve sealing between the downhole working mechanisms.

[0055] The upper end of the temperature and pressure measurement system 1 is connected to a continuous oil pipe via a thread, and the lower end is connected to a circumferential rotating system 2 via a thread.

[0056] The circumferential rotation system 2 includes an upper circumferential rotation short circuit 2.1 and a lower circumferential rotation short circuit 2.2. Excluding the motor part, the upper circumferential rotation short circuit 2.1 and the lower circumferential rotation short circuit 2.2 have similar functions but opposite directions. The upper circumferential rotation short circuit 2.1 is driven by a hollow motor 2.1.4 and is used to control the circumferential rotation of the axial motion system 3 and the entire downhole tool. The lower circumferential rotation short circuit 2.2 is used to assist in supporting the downhole tool and provide the degree of freedom for circumferential rotation.

[0057] The upper circumferential rotary short connector 2.1 includes an upper central tube back cap 2.1.1, an circumferential rotary upper connector 2.1.2, an upper central tube 2.1.3, a hollow motor 2.1.4, a hollow motor protective shell 2.1.5, a hollow motor bracket 2.1.6, a circumferential coupling 2.1.7, an upper circumferential bearing assembly 2.1.8, and an upper circumferential bearing assembly protective shell 2.1.9;

[0058] The upper center tube back cap 2.1.1 is connected to the upper center tube 2.1.3 by threads, and serves to bear weight and limit movement;

[0059] The upper end of the circumferential rotary upper connector 2.1.2 is connected to the temperature and pressure measuring system 1 by a thread, and the lower end is connected to the hollow motor protective shell 2.1.5 by a thread. The internal platform has an upper central tube 2.1.3 mounting hole and four limit pin mounting holes. After the limit pins are installed, they can restrict the rotational freedom between the upper central tube 2.1.3 and the circumferential rotary upper connector 2.1.2.

[0060] The upper central tube 2.1.3 passes through the circumferential rotary upper joint 2.1.2, the hollow motor 2.1.4, the hollow motor bracket 2.1.6, the circumferential coupling 2.1.7, and the upper circumferential bearing assembly protective shell 2.1.9. The central tube has a through hole for the passage of control cables and inertial displacement media pipelines. The two-stage shoulders at the lower end of the upper central tube 2.1.3 are used to install the bearing assembly and bear the mass of the tool string below the axial motion system 3.

[0061] The hollow motor 2.1.4 consists of an upper motor and a lower reducer, and is used to control the circumferential rotation of the downhole tool. The hollow motor 2.1.4 is hollow to pass through the upper central tube 2.1.3. The lower reducer has a wing plate with a light hole for mounting the motor. The output shaft is matched with the circumferential coupling 2.1.7.

[0062] The upper end of the hollow motor protective shell 2.1.5 is connected to the circumferential rotating upper connector 2.1.2 via a threaded connection, and the lower end is connected to the hollow motor bracket 2.1.6 via a threaded connection, thus serving a connecting function;

[0063] The hollow motor bracket 2.1.6 is used to seal the upper circumferential rotatable short circuit 2.1 and to allow the circumferential coupling 2.1.7 to pass through. The upper end is connected to the hollow motor protective shell 2.1.5 by a thread. A through hole is opened at the axis position of the part so that the circumferential coupling 2.1.7 can pass through.

[0064] The circumferential coupling 2.1.7 is used to seal the upper end of the axial motion system 3 and transmit the torque output by the hollow motor 2.1.4;

[0065] The upper circumferential bearing assembly 2.1.8 is installed on the upper central tube 2.1.3, and the outer ring is fitted with the inner hole of the upper circumferential bearing assembly protective shell 2.1.9 to ensure that the axial motion system 3 and the downhole tool rotate smoothly along the tool string axis.

[0066] The upper end of the protective shell 2.1.9 of the upper circumferential bearing assembly is connected to the circumferential coupling 2.1.7 by a thread, and the lower end is connected to the axial movement sleeve 3.1 by a thread, which serves to connect and protect the internal bearing assembly. The axis of the part has a through hole that allows the upper central tube 2.1.3 to pass through.

[0067] The lower circumferential rotary short connector 2.2 includes a lower central tube back cap 2.2.1, a lower circumferential bearing assembly 2.2.2, a lower circumferential bearing assembly protective shell 2.2.3, a lower central tube 2.2.4, a lower circumferential rotary sealing ring 2.2.5, and a circumferential rotary lower connector 2.2.6;

[0068] The lower end of the lower center tube back cap 2.2.1 is connected to the lower center tube 2.2.4 by a thread, which serves to bear weight and limit movement;

[0069] The lower circumferential bearing assembly 2.2.2 is installed on the lower central tube 2.2.4, and the outer ring is fitted with the inner hole of the lower circumferential bearing assembly protective shell 2.2.3 to ensure that the axial motion system 3 and the downhole tool rotate smoothly along the tool string axis.

[0070] The upper end of the lower circumferential bearing assembly protective shell 2.2.3 is connected to the downhole tool protective shell 4 by a thread, and the lower end is connected to the lower circumferential rotary sealing ring 2.2.5 by a thread, which serves to connect and protect the internal bearing assembly.

[0071] The lower central tube 2.2.4 passes through the lower circumferential rotating sealing ring 2.2.5 and the circumferential rotating lower connector 2.2.6. A through hole is opened at the axial position for the passage of the control cable, and the two-stage shoulders at the upper end are used to install the bearing assembly.

[0072] The upper end of the lower circumferential rotary sealing ring 2.2.5 is connected to the lower circumferential bearing assembly protective shell 2.2.3 by a thread, and a through hole is opened at the axial position to allow the lower central tube 2.2.4 to pass through, which serves to fix and seal.

[0073] The upper end of the circumferential rotating lower connector 2.2.6 is connected to the lower central tube 2.2.4 by a thread, and the lower end is connected to the lower electric packer by a thread, thus serving as a connection.

[0074] The axial motion system 3 includes an axial motion sleeve 3.1, an axial motor protective shell 3.2, an axial motor 3.3, an axial coupling 3.4, an axial coupling protective cover 3.5, an axial bearing short circuit 3.6, a tool protective shell adapter 3.7, a lead screw 3.8, a lead screw nut protective cover 3.9, and a nut connector 3.10;

[0075] The upper end of the axial motion sleeve 3.1 is connected to the upper circumferential bearing assembly protective shell 2.1.9 by a thread, and the lower end is connected to the tool protective shell adapter 3.7 by a thread, thus serving a connecting function;

[0076] The upper end of the axial motor protective housing 3.2 has a connector for passing a cable through which the control cable of the axial motor 3.3 passes. The lower end is connected to the axial coupling protective cover 3.5 by a thread, and the axial motor 3.3 is located in its internal space, which is used to protect and fix the axial motor 3.3.

[0077] The axial motor 3.3 is located inside the axial motor protective housing 3.2 and is used to provide the original power for the axial movement of the downhole tool;

[0078] The axial coupling 3.4 is located inside the axial coupling protective cover 3.5, and its upper and lower ends are connected to the axial motor 3.3 and the lead screw 3.8 respectively, for transmitting the output torque of the axial motor 3.3;

[0079] The upper end of the axial coupling protective cover 3.5 is connected to the axial motor protective shell 3.2 by a thread, and the lower end is connected to the tool protective shell adapter 3.7 and the axial bearing short circuit 3.6 by a thread. The axial coupling 3.4 is located in its internal space, which serves to connect and protect the axial coupling 3.4.

[0080] The upper end of the axial bearing short circuit 3.6 is connected to the axial coupling protective cover 3.5 by a thread, and the lower end is connected to the lead screw nut protective cover 3.9 by a thread. The internal bearing is sleeved on the lead screw 3.8 to ensure that the lead screw 3.8 coincides with the axis of the axial motion system 3 and rotates smoothly.

[0081] The upper end of the tool protective housing adapter 3.7 is connected to the axial movement sleeve 3.1 and the axial coupling protective cover 3.5 by a thread, and the lower end is connected to the downhole tool protective housing 4 by a thread, which serves as a transition connection.

[0082] The lead screw 3.8 is located inside the lead screw nut protective cover 3.9. Its upper end is connected to the axial coupling 3.4, and its lower threaded part is engaged with the lead nut joint 3.10. During operation, the axial coupling 3.4 drives the lead screw 3.8 to rotate in a circumferential direction, and the lead nut joint 3.10 can move up and down along the axis to play a transmission role.

[0083] The upper end of the lead screw and nut protective cover 3.9 is connected to the axial bearing short circuit 3.6 by a thread, which serves to protect the internal lead screw 3.8 and lead screw nut joint 3.10;

[0084] The lead screw nut connector 3.10 is located inside the lead screw nut protective cover 3.9 and has a threaded through hole along the axis. Driven by the lead screw 3.8, it can move up and down along the axis. The lower end is connected to the downhole tool adapter through the thread. Four pin guides are opened on the outer circle side to limit the rotational freedom of the lead screw nut connector 3.10.

[0085] The upper end of the downhole tool protective shell 4 is connected to the tool protective shell adapter 3.7 by a thread, and the lower end is connected to the lower circumferential bearing assembly protective shell 2.2.3 by a thread, which is used to achieve sealing between the downhole working mechanisms.

[0086] Usage steps:

[0087] I. Ground Assembly and Debugging

[0088] The system includes a temperature and pressure measurement system 1, a circumferential rotation system 2, an axial motion system 3, and a downhole tool protective housing 4. The surface assembly process is as follows:

[0089] The upper end of the temperature and pressure measurement system 1 is connected to a continuous oil pipe via a thread, and the lower end is connected to the circumferential rotary joint 2.1.2 of the upper circumferential rotary short circuit 2.1 via a thread;

[0090] The upper central tube 2.1.3 is passed through the circumferential rotating upper joint 2.1.2, and its rotational freedom is fixed with a limiting pin;

[0091] Install the hollow motor 2.1.4 and the hollow motor protective shell 2.1.5 to ensure that the motor output shaft is matched with the circumferential coupling 2.1.7;

[0092] The components of the upper circumferential bearing assembly 2.1.8, the upper circumferential bearing assembly protective shell 2.1.9, the lower circumferential bearing assembly 2.2.2, the lower circumferential bearing assembly protective shell 2.2.3, and the lower central tube 2.2.4 are installed in sequence. The upper central tube back cap 2.1.1 and the lower central tube back cap 2.2.1 are used for the load bearing and limiting of the upper and lower central tubes, respectively. The circumferential rotating lower connector 2.2.6 is used to connect the lower tool.

[0093] Connect the upper end of the axial motion outer sleeve 3.1 to the upper circumferential bearing assembly protective shell 2.1.9;

[0094] An axial motor 3.3 is installed inside the axial motor protective housing 3.2 and connected to a lead screw 3.8 via an axial coupling 3.4;

[0095] Use an axial coupling protective cover 3.5 for protection, and fit the axial bearing short circuit 3.6 onto the lead screw to ensure alignment;

[0096] The axial movement outer sleeve 3.1 is connected to the downhole tool protective shell 4 via the tool protective shell adapter 3.7;

[0097] The entire transmission pair of the lead screw and lead screw nut joint 3.10 is encapsulated within the lead screw and lead screw nut protective cover 3.9;

[0098] Connect the upper end of the downhole tool protective housing 4 to the tool protective housing adapter 3.7, and the lower end to the lower circumferential bearing assembly protective housing 2.2.3 to complete the mechanical and sealing connection of the entire system.

[0099] After assembly, perform functional debugging: test whether the data transmission of the temperature and pressure measurement system 1 is normal; start the hollow motor 2.1.4 to check whether the circumferential rotation is smooth; start the axial motor 3.3 to drive the lead screw 3.8 to rotate, and observe whether the lead screw connector 3.10 can move stably along its pin guide rail; at the same time, perform an overall pressure test.

[0100] II. Tool Deployment in the Well

[0101] The tool string is lowered to the target working section via a continuous tubing, and the temperature and pressure measurement system 1 continues to work, transmitting real-time data.

[0102] Upon reaching the designated position, the hollow motor 2.1.4 of the upper circumferential rotation short circuit 2.1 is started according to the work requirements. The torque is transmitted through the circumferential coupling 2.1.7, driving the internal tool string supported by the upper circumferential bearing assembly 2.1.8 and the lower circumferential bearing assembly 2.2.2 to rotate in the circumferential direction.

[0103] Simultaneously, the axial motor 3.3 of the axial motion system 3 is started, and the torque drives the lead screw 3.8 to rotate through the axial coupling 3.4, thereby forcing the lead screw nut joint 3.10 to move axially within the lead screw and lead screw nut protective cover 3.9, so as to achieve precise axial positioning of the downhole tool;

[0104] The tool protective housing adapter 3.7 and the downhole tool protective housing 4 together provide sealing protection for the internal moving parts. The ground operator needs to work together to control the circumferential rotation and axial movement, and monitor the system status throughout the process.

[0105] III. Tool Recycling

[0106] Stop all motor operation, slowly raise the tool string to the surface through the coiled tubing, and separate the tool from the coiled tubing at the wellhead;

[0107] After recovery, disassemble in roughly the reverse order of assembly, in the following order: downhole tool protective shell 4, axial motion system 3 (including screw nut joint 3.10, screw 3.8, axial bearing short circuit 3.6) and circumferential rotation system 2 (including lower circumferential rotation sealing ring 2.2.5, lower central tube 2.2.4).

[0108] Clean, inspect, lubricate and maintain all disassembled components (such as bearing assemblies, couplings, lead screw and nut pairs, and sealing rings), calibrate sensors, and prepare for the next operation.

Claims

1. A welding axial and rotary motion system in a dedicated cylindrical coordinate system for wellbore installation, comprising a temperature and pressure measurement system (1), a circumferential rotation system (2), an axial motion system (3), and a downhole tool protective shell (4), characterized in that: The temperature and pressure measurement system (1) is used to read the temperature and pressure data of the working section in real time and transmit the read data back to the ground via cable for reference by the ground operators; the circumferential rotation system (2) is used to control the circumferential rotation of the entire downhole tool; the axial motion system (3) is used to control the axial movement of the downhole tool along the tool string; the downhole tool protective shell (4) is used to protect the downhole working mechanism, play a supporting and connecting role in the entire system, and realize the sealing between the downhole working mechanisms.

2. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 1, characterized in that, The temperature and pressure measurement system (1) is connected to a continuous oil pipe at the upper end via a thread, and to a circumferential rotating system (2) at the lower end via a thread.

3. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 1, characterized in that, The circumferential rotation system (2) includes an upper circumferential rotation short circuit (2.1) and a lower circumferential rotation short circuit (2.2). Excluding the motor part, the upper circumferential rotation short circuit (2.1) and the lower circumferential rotation short circuit (2.2) have similar functions but opposite directions. The upper circumferential rotation short circuit (2.1) is driven by a hollow motor (2.1.4) and is used to control the circumferential rotation of the axial motion system (3) and the entire downhole tool. The lower circumferential rotation short circuit (2.2) is used to assist in supporting the downhole tool and provide the degree of freedom for circumferential rotation.

4. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 3, characterized in that, The upper circumferential rotary short connector (2.1) includes an upper central tube back cap (2.1.1), an circumferential rotary upper connector (2.1.2), an upper central tube (2.1.3), a hollow motor (2.1.4), a hollow motor protective shell (2.1.5), a hollow motor bracket (2.1.6), a circumferential coupling (2.1.7), an upper circumferential bearing assembly (2.1.8), and an upper circumferential bearing assembly protective shell (2.1.9). The upper center tube back cap (2.1.1) is connected to the upper center tube (2.1.3) by threads, and serves to bear weight and limit movement; The upper end of the circumferential rotary upper connector (2.1.2) is connected to the temperature and pressure measurement system (1) by a thread, and the lower end is connected to the hollow motor protective shell (2.1.5) by a thread. The internal platform has an upper central tube (2.1.3) mounting hole and four limit pin mounting holes. After the limit pins are installed, they can restrict the rotational freedom between the upper central tube (2.1.3) and the circumferential rotary upper connector (2.1.2). The upper central tube (2.1.3) passes through the circumferential rotary upper joint (2.1.2), the hollow motor (2.1.4), the hollow motor bracket (2.1.6), the circumferential coupling (2.1.7), and the upper circumferential bearing assembly protective shell (2.1.9). The central tube has a through hole for the passage of control cables and inertial displacement medium pipes. The two-stage shoulders at the lower end of the upper central tube (2.1.3) are used to install the bearing assembly and bear the mass of the tool string below the axial motion system (3).

5. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 4, characterized in that, The hollow motor (2.1.4) consists of an upper motor and a lower reducer, used to control the circumferential rotation of the downhole tool. The hollow motor (2.1.4) is entirely hollow to pass through the upper central tube. 2.1.3), the lower reducer has a perforated wing plate for mounting the motor, and the output shaft is fitted with the circumferential coupling (2.1.7); The upper end of the hollow motor protective shell (2.1.5) is connected to the circumferential rotating upper connector (2.1.2) by a thread, and the lower end is connected to the hollow motor bracket (2.1.6) by a thread, which serves as a connection. The hollow motor bracket (2.1.6) is used to seal the upper circumferential rotary short circuit (2.1) and allow the circumferential coupling (2.1.7) to pass through. The upper end is connected to the hollow motor protective shell (2.1.5) by a thread. A through hole is opened at the axis position of the part so that the circumferential coupling (2.1.7) can pass through. The circumferential coupling (2.1.7) is used to seal the upper end of the axial motion system (3) and transmit the torque output by the hollow motor (2.1.4); The upper circumferential bearing assembly (2.1.8) is installed on the upper central tube (2.1.3), and the outer ring is fitted with the inner hole of the upper circumferential bearing assembly protective shell (2.1.9) to ensure that the axial motion system (3) and the downhole tool rotate smoothly along the tool string axis. The upper end of the protective shell (2.1.9) of the upper circumferential bearing assembly is connected to the circumferential coupling (2.1.7) by a thread, and the lower end is connected to the axial motion sleeve (3.1) by a thread, which serves to connect and protect the internal bearing assembly. The axis of the part has a through hole that allows the upper central tube (2.1.3) to pass through.

6. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 3, characterized in that, The lower circumferential rotary short connector (2.2) includes a lower central tube back cap (2.2.1), a lower circumferential bearing assembly (2.2.2), a lower circumferential bearing assembly protective shell (2.2.3), a lower central tube (2.2.4), a lower circumferential rotary sealing ring (2.2.5), and a circumferential rotary lower connector (2.2.6); The lower end of the lower center tube back cap (2.2.1) is connected to the lower center tube (2.2.4) by a thread, which serves to bear weight and limit movement; The lower circumferential bearing assembly (2.2.2) is installed on the lower central tube (2.2.4), and the outer ring is fitted with the inner hole of the lower circumferential bearing assembly protective shell (2.2.3) to ensure that the axial motion system (3) and the downhole tool rotate smoothly along the tool string axis. The upper end of the lower circumferential bearing assembly protective shell (2.2.3) is connected to the downhole tool protective shell (4) by a thread, and the lower end is connected to the lower circumferential rotary sealing ring (2.2.5) by a thread, which serves to connect and protect the internal bearing assembly.

7. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 6, characterized in that, The lower central tube (2.2.4) passes through the lower circumferential rotating sealing ring (2.2.5) and the circumferential rotating lower joint (2.2.6), and has a through hole at the axial position for passing through the control cable. The two-stage shoulders at the upper end are used to install the bearing assembly. The upper end of the lower circumferential rotary sealing ring (2.2.5) is connected to the lower circumferential bearing assembly protective shell (2.2.3) by a thread, and a through hole is opened at the axial position to allow the lower central tube (2.2.4) to pass through, which serves to fix and seal. The upper end of the circumferential rotating lower connector (2.2.6) is connected to the lower central tube (2.2.4) by a thread, and the lower end is connected to the lower electric packer by a thread, thus serving as a connection.

8. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 7, characterized in that, The axial motion system (3) includes an axial motion sleeve (3.1), an axial motor protective shell (3.2), an axial motor (3.3), an axial coupling (3.4), an axial coupling protective cover (3.5), an axial bearing short connector (3.6), a tool protective shell adapter (3.7), a lead screw (3.8), a lead screw nut protective cover (3.9), and a nut connector (3.10). The upper end of the axial motion sleeve (3.1) is connected to the upper circumferential bearing assembly protective shell (2.1.9) by a thread, and the lower end is connected to the tool protective shell adapter (3.7) by a thread, thus serving a connecting function; The upper end of the axial motor protective housing (3.2) has a connector that allows the cable to pass through, for the axial motor (3.3) control cable to pass through, and the lower end is connected to the axial coupling protective cover (3.5) by a thread, with the axial motor (3.3) located in its internal space, for the protection and fixation of the axial motor (3.3); The axial motor (3.3) is located inside the axial motor protective housing (3.2) and is used to provide the original power for the axial movement of the downhole tool; The axial coupling (3.4) is located inside the axial coupling protective cover (3.5), and its upper and lower ends are connected to the axial motor (3.3) and the lead screw (3.8) respectively, for transmitting the output torque of the axial motor (3.3); The upper end of the axial coupling protective cover (3.5) is connected to the axial motor protective shell (3.2) by a thread, and the lower end is connected to the tool protective shell adapter (3.7) and the axial bearing short circuit (3.6) by a thread. The axial coupling (3.4) is located in its internal space, which serves to connect and protect the axial coupling (3.4).

9. The welding axial and rotational motion system in a dedicated cylindrical coordinate system within a wellbore according to claim 8, characterized in that, The upper end of the axial bearing short circuit (3.6) is connected to the axial coupling protective cover (3.5) by a thread, and the lower end is connected to the screw nut protective cover (3.9) by a thread. The internal bearing is sleeved on the screw (3.8) to ensure that the screw (3.8) coincides with the axis of the axial motion system (3) and rotates smoothly. The upper end of the tool protective shell adapter (3.7) is connected to the axial motion outer sleeve (3.1) and the axial coupling protective cover (3.5) by a thread, and the lower end is connected to the downhole tool protective shell (4) by a thread, which serves as a transition connection. The lead screw (3.8) is located inside the lead screw nut protective cover (3.9). Its upper end is connected to the axial coupling (3.4), and its lower end threaded part is engaged with the nut joint (3.10). During operation, the axial coupling (3.4) drives the lead screw (3.8) to rotate in a circumferential direction, and the nut joint (3.10) can move up and down along the axis to play a transmission role. The upper end of the lead screw and nut protective cover (3.9) is connected to the axial bearing short circuit (3.6) by a thread, which serves to protect the internal lead screw (3.8) and nut joint (3.10); The screw nut connector (3.10) is located inside the screw nut protective cover (3.9) and has a threaded through hole along the axis. Driven by the screw (3.8), it can move up and down along the axis. The lower end is connected to the downhole tool adapter through the thread. Four pin guides are opened on the outer circle side to limit the rotational freedom of the screw nut connector (3.10).

10. A welding axial and rotational motion system in a dedicated cylindrical coordinate system for wellbore installation according to claim 9, characterized in that, The upper end of the downhole tool protective shell (4) is connected to the tool protective shell adapter (3.7) by a thread, and the lower end is connected to the lower circumferential bearing assembly protective shell (2.2.3) by a thread, which is used to achieve sealing between downhole working mechanisms.

Images