Full-automatic slurry continuous circulation system and method for tripping drill column

Abstract

The invention discloses a full-automatic slurry continuous circulation system for tripping a drill string, which relates to the technical field of continuous circulation drilling and consists of a wellhead circulation subsystem, a pipe confluence passage self-control subsystem, a platform self-control subsystem and a slurry pumping-in subsystem. The wellhead circulation subsystem comprises a continuous circulation valve, a side circulation automatic connecting device and a main circulation automatic connecting device, rapid and automatic connection of main circulation and side circulation is achieved, and the operation efficiency and the operation safety of continuous circulation drilling are greatly improved; the pipe confluence channel automatic control subsystem comprises a flow channel switching device, the flow channel switching function and the flow channel switching control function are integrated, the system size is greatly reduced, and the occupied area of the whole skid-mounted structure of the system is reduced. The system is further provided with a platform self-control subsystem, has the intelligent functions of real-time acquisition, analysis and processing of drilling data and fault prediction and diagnosis in the operation process, and achieves automatic control and continuous circulation drilling operation.

Description

Technical Field

[0001] The present invention relates to the field of deep-sea continuous circulation drilling, and in particular to a fully automatic mud continuous circulation system and method for tripping and lowering a drill string. Background Art

[0002] A continuous circulation drilling system maintains uninterrupted circulation of drilling fluid during the drilling process, primarily addressing the issues associated with stopping the pump to connect a single well. Its operating principle is to create a pressure chamber that allows the drilling fluid to circulate during the breakout operation on the drill pipe, thereby maintaining a continuous flow of drilling fluid.

[0003] In recent years, as sweet spots in oil and gas production have gradually decreased, continuous circulation drilling technology, suitable for complex geological conditions, has rapidly developed. For example, patents protect continuous circulation system technologies, such as the patented continuous circulation system (application number 201110351744.4) and the flow channel conversion control system (application number 201110316258.9).

[0004] However, the above-mentioned continuous circulation drilling patent and corresponding technology have many problems in actual application, which greatly limits the popularization and application of this system in deep-sea drilling. The specific problems are as follows:

[0005] (1) Given the limited space on deep-sea drilling platforms (drilling ships), the spatial compatibility of the system with the deep-sea drilling platform (drilling ship) is crucial. However, existing systems are too large to fit within the limited space of deep-sea drilling platforms or drilling ships, resulting in a disordered spatial layout of the deep-sea drilling platform (drilling ship), which seriously affects the efficiency of drilling operations.

[0006] (2) In deep-sea drilling, an operation scenario that is highly complex, technology-intensive, and has a harsh environment, the existing system has poor human-computer interaction and is not labor-friendly, which greatly limits the labor efficiency of on-site workers and thus affects the safety of operations.

[0007] (3) The existing system can only execute basic on-site operation instructions, which makes it difficult to meet the increasingly stringent operational requirements such as real-time data analysis and processing, fault prediction and diagnosis, thus restricting its applicability in deep-sea drilling work.

[0008] In view of this, it is an urgent need to invent a deep-sea continuous circulation drilling system and method that is more suitable for deep-sea drilling platforms or drilling ships, more labor-friendly, more automated and intelligent. Summary of the Invention

[0009] In response to the unique environmental and technical challenges of deep-sea continuous circulation drilling, a fully automatic continuous mud circulation system and method for raising and lowering the drill string has been invented. The system consists of a wellhead circulation subsystem, a manifold flow automatic control subsystem, a platform automatic control subsystem, and a mud pumping subsystem. The wellhead circulation subsystem includes the drill pipe, continuous circulation valve, drilling platform, and a side circulation automatic connection device. The main circulation automatic connection device ensures the automatic connection and connectivity of the main and side circulations, improves the switching speed of the main and side circulations, and thus improves operational efficiency. It also features good human-machine interaction and labor-friendly features, greatly improving the labor efficiency of on-site workers, operational safety, and the practicality of the system. The manifold flow automatic control subsystem includes a flow channel switching device, which integrates flow channel switching and control flow channel switching functions, greatly reducing the system's size and the overall footprint of the system's skid-mounted structure. By utilizing the platform automatic control subsystem, the system achieves real-time data analysis and processing, automatic control of continuous circulation drilling operations, fault prediction and diagnosis, and autonomous decision-making and optimized control under complex working conditions. The various parts of this system are concisely designed and rationally laid out. It can achieve fully automatic connection and connectivity between the main and side circulations within the limited space of deep-sea drilling platforms (drilling vessels). It has excellent human-machine interaction and can also implement intelligent automatic control. This tool not only ensures the continuity and efficiency of operations, but also greatly reduces operating costs and potential operational risks.

[0010] A fully automatic continuous mud circulation system for tripping and lowering a drill string, mainly consisting of a wellhead circulation subsystem, a manifold flow channel automatic control subsystem, a mud pumping subsystem, a platform automatic control subsystem, and a mud pumping subsystem, is characterized by:

[0011] The wellhead circulation subsystem consists of a crane, a top drive, a drill pipe, a continuous circulation valve, a drill floor, a side circulation automatic connection device, and a main circulation automatic connection device: the crane is installed on the derrick, the top drive is installed on the crane, and the top drive provides torque for drilling, the head end of the drill pipe is connected to the top drive, and the tail end is connected to the continuous circulation valve, the continuous circulation valve is connected to the drill pipe at both ends and is internally connected, the side circulation automatic connection device is installed on the drill floor, and the main circulation automatic connection device is installed on the drill floor;

[0012] The manifold flow automatic control subsystem consists of a flow channel switching device, butterfly valve I, a three-way filter joint, butterfly valve II, butterfly valve III, a filter, a hydraulic control channel, butterfly valve IV, a piston, a pressure relief channel I, a pressure relief channel II, a drilling hose, and a side circulation power channel, and is skid-mounted in a vertical cabinet: the flow channel switching device is vertical, including: hydraulic control port I, hydraulic control port II, a partition, a pressure relief port I, an upper cover, a power mud inlet, a lower cover, a pressure relief port II, a side circulation channel port, and a main circulation channel port. The head end of the butterfly valve I is connected to the hydraulic control port I, and the tail end is connected to the three-way filter joint. The head end of the butterfly valve II is connected to the hydraulic control port II. The tail end is connected to the three-way filter joint, the filter is connected to the power mud inlet, the hydraulic control channel is connected to the three-way filter joint, the piston includes: a piston face, a piston rod, a piston lower end face, and a piston lower end face, the piston face, piston rod, piston lower end face, and piston upper end face are all in contact with the inner wall of the flow channel switching device, the butterfly valve III is connected to the pressure relief port I, the butterfly valve IV is connected to the pressure relief port II, the head end of the drilling hose is connected to the main circulation channel port, and the tail end is connected to the top drive, the head end of the side circulation power channel is connected to the side circulation channel port, and the tail end is connected to the side circulation automatic connection device;

[0013] The mud pumping subsystem consists of a drilling power channel, a drilling power pump, a hydraulically controlled power pump, a mud channel, and a mud pool: the drilling power channel is connected to the filter at its head end and to the drilling power pump at its tail end; the drilling power pump is connected to the mud pool at its tail end; the hydraulically controlled power pump is connected to the hydraulic control channel at its head end and to the mud pool at its tail end; and the mud channel is connected to the mud pool;

[0014] The platform automatic control subsystem consists of a pressure sensor, a flow sensor, a data transmission line, an on-site automatic control console, a remote intelligent control center, and communication related components: the pressure sensor is a snap-on type, and is respectively installed on the drilling water hose, the side circulation power channel, and the flow channel switching device; the flow sensor is a snap-on type, and is respectively installed on the drilling water hose and the side circulation power channel; the head end of the data transmission line is connected to the pressure sensor and the flow sensor, and the tail end is connected to the on-site automatic control console; the remote intelligent control center realizes intelligent control of the on-site equipment and the on-site automatic control console through communication related components.

[0015] The side circulation automatic connection device is mainly composed of a base, a rotating joint, a quick connector, a sensor, and a connecting cable connected in sequence, and is connected to the platform automatic control subsystem to achieve the maintenance and stability of any posture. The quick connection mechanism on the side circulation automatic connection device can realize automatic rapid connection and disconnection with the continuous circulation valve, as well as leakage monitoring. The main circulation automatic connection device is mainly composed of a fixed bracket, a multi-degree-of-freedom joint, a mechanical arm, a clamping hand, and a power cable connected in sequence, and is connected to the platform automatic control subsystem to achieve automatic connection and disconnection of the drill pipe and the continuous circulation valve.

[0016] The three-pass filter joint can realize the mutual communication and cooperation between the hydraulic control port I and the hydraulic control port II in the flow channel switching device through the mutual cooperation between the butterfly valve I and the butterfly valve II;

[0017] The lower end surface of the piston can be sealed with the lower cover of the flow channel switching device, and the upper end surface of the piston can be sealed with the upper cover of the flow channel switching device;

[0018] The remote intelligent control center can realize the automation of the entire process of drilling and connecting single roots, and has the intelligent functions of real-time analysis and processing of data, fault prediction and diagnosis, and autonomous decision-making and optimized control under complex working conditions.

[0019] A fully automatic mud continuous circulation method for tripping a drill string comprises the following steps:

[0020] SⅠ, drilling, specifically including the following steps:

[0021] Sa. Running tools: Connect the drill bit, drill pipe and continuous circulation valve in sequence and then connect them to the top drive;

[0022] Sb. Vertical drilling: The on-site automatic control console or remote intelligent control center automatically controls the three-way filter joint to communicate with butterfly valve I and butterfly valve II, so that the mud liquid passes through the hydraulic power pump, hydraulic control channel, three-way filter joint, butterfly valve I in sequence, and then pushes the piston downward. The movement stops when the lower end face of the piston and the lower cover of the flow channel switching device complete the end face seal. At this time, the mud liquid passes through the drilling power pump, the drilling power channel, and enters the flow channel switching device in sequence. It is then transported to the top drive by the drilling hose for drilling operations;

[0023] SⅡ, connect the order, specifically including the following steps:

[0024] Sc. Close the main circulation: the side circulation automatic connection device is automatically connected to the continuous circulation valve, and the on-site automatic control console or remote intelligent control center automatically controls the three-way filter joint to communicate with the butterfly valve I and butterfly valve II, so that the mud liquid passes through the hydraulic power pump, hydraulic control channel, three-way filter joint, butterfly valve II in sequence, and then pushes the piston to move upward. When the upper end face of the piston and the upper cover of the flow channel switching device complete the end face seal, the piston stops and the main circulation is closed;

[0025] Sd. Open the side circulation: After that, the mud fluid passes through the drilling power pump, the drilling power channel, the flow channel switching device, the side circulation power channel, and then enters the side circulation automatic connection device and the continuous circulation valve to realize side circulation. The butterfly valve III is automatically controlled by the on-site automatic control console or the remote intelligent control center to realize pressure relief;

[0026] Se. Connecting the columns: Move the top drive upwards by crane, connect the drill pipe and the continuous circulation valve in sequence, then connect them to the top drive, and then connect them to the continuous circulation valve that is performing side circulation;

[0027] SⅢ, drill down, specifically includes the following steps:

[0028] Sf. Close the side circulation: The on-site automatic control console or remote intelligent control center automatically controls the three-way filter joint to communicate with the butterfly valve I and butterfly valve II, so that the mud liquid passes through the hydraulic power pump, hydraulic control channel, three-way filter joint, butterfly valve I in sequence, and then pushes the piston downward. When the lower end face of the piston completes the end face seal with the lower cover of the flow channel switching device, the piston stops and the side circulation is closed.

[0029] Sg. Open the main circulation: The mud fluid passes through the drilling power pump, the drilling power channel, and enters the flow channel switching device in sequence. It is then transported to the top drive by the drilling hose for drilling operations. The butterfly valve IV is automatically controlled by the on-site automatic control console or the remote intelligent control center to achieve pressure relief;

[0030] SIV. Repeat the above steps Sc-Sg to complete the deep-sea continuous circulation drilling operation.

[0031] The beneficial effects of the present invention are:

[0032] 1. The wellhead circulation subsystem in this system includes drill pipe, continuous circulation valve, drilling platform, side circulation automatic connection device, and main circulation automatic connection device. It ensures the rapid and automatic connection of the main and side circulations, improves the switching speed of the main and side circulations, and improves the operation efficiency. It also has good human-machine interaction and realizes labor-friendlyness, greatly improving the labor efficiency of on-site workers, the safety and practicality of operations;

[0033] 2. The flow channel switching device included in the manifold flow channel automatic control subsystem in this system integrates the flow channel switching and control flow channel switching functions, greatly reducing the system size, making high-efficiency use of the space on deep-sea drilling platforms or drilling ships, and achieving spatial adaptability between the system and deep-sea drilling platforms (drilling ships);

[0034] 3. The system adopts a platform automatic control subsystem to realize the intelligent functions of real-time data analysis and processing, automatic control of continuous cycle drilling operations, fault prediction and diagnosis, autonomous decision-making and optimized control under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the overall system of the present invention;

[0036] Figure 2 This is an appearance diagram of the flow channel switching device of the present invention;

[0037] Figure 3 is a cross-sectional view of the flow channel switching device of the present invention;

[0038] Figure 4 A piston diagram of the present invention;

[0039] Figure 5 This is the working diagram of the manifold flow channel automatic control subsystem of the present invention;

[0040] Figure 6 This is the working diagram II of the manifold flow channel automatic control subsystem of the present invention;

[0041] Figure 7 This is a diagram of the side circulation automatic connection device of the present invention;

[0042] Figure 8 This is a diagram of the main circulation automatic connection device of the present invention;

[0043] In the figure, 1-drilling hose, 2-crane, 3-top drive, 4-drill pipe, 5-continuous circulation valve, 6-drilling platform, 7-side circulation automatic connection device, 701-base, 702-rotation joint, 703-sensor, 704-quick connector, 8-side circulation power channel, 9-pressure sensor, 10-flow sensor, 11-flow channel switching device, 1101-hydraulic control port I, 1102-hydraulic control port II, 1103-partition, 1104-pressure relief port I, 1105-upper cover, 1106-power mud inlet, 1107-lower cover, 1108-pressure relief port II, 1109-side circulation channel port, 1110-main circulation channel port, 12-butterfly valve I, 13-three-pass filter joint, 14-butterfly valve II , 15-butterfly valve III, 16-filter, 17-hydraulic control channel, 18-pressure relief channel I, 19-drilling power channel, 20-drilling power pump, 21-hydraulic control power pump, 22-mud pool, 23-mud channel, 24-data transmission line, 25-on-site automatic control console, 26-remote intelligent control center, 27-butterfly valve IV, 28-piston, 2801-piston surface, 2802-piston rod, 2803-piston lower end surface, 2804-piston upper end surface, 29-pressure relief channel II, 30-communication related, 31-main circulation automatic connection device, 3101-fixed bracket, 3102-multi-degree-of-freedom joint, 3103-mechanical arm, 3104-gripping hand, 32-connecting cable, 33-power cable. DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to the accompanying drawings, and the protection scope of the present invention is not limited to the following:

[0045] like Figures 1 to 8As shown, a fully automatic continuous mud circulation system for tripping and lowering a drill string is mainly composed of a wellhead circulation subsystem, a manifold flow channel automatic control subsystem, a mud pumping subsystem, a platform automatic control subsystem, and a mud pumping subsystem. It is characterized by:

[0046] The wellhead circulation subsystem consists of a crane 2, a top drive 3, a drill pipe 4, a continuous circulation valve 5, a drill floor 6, a side circulation automatic connection device 7, and a main circulation automatic connection device 31: the crane is installed on the derrick, the top drive is installed on the crane, and the top drive provides torque for drilling, the head end of the drill pipe is connected to the top drive, and the tail end is connected to the continuous circulation valve, the continuous circulation valve is connected to the drill pipe at both ends, and the internal connection is connected, the side circulation automatic connection device 7 is installed on the drill floor, and the main circulation automatic connection device 31 is installed on the drill floor 6;

[0047] The manifold flow automatic control subsystem consists of a flow channel switching device 11, a butterfly valve I 12, a three-way filter joint 13, a butterfly valve II 14, a butterfly valve III 15, a filter 16, a hydraulic control channel 17, a butterfly valve IV 27, a piston 28, a pressure relief channel I 18, a pressure relief channel II 29, a drilling hose 1, and a side circulation power channel 8, and is skid-mounted in a vertical cabinet: the flow channel switching device 11 is vertical, including: a hydraulic control port I 1101, a hydraulic control port II 1102, a partition 1103, a pressure relief port I 1104, an upper cover 1105, a power mud inlet 1106, a lower cover 1107, a pressure relief port II 1108, a side circulation channel port 1109, and a main circulation channel port 1110. The head end of the butterfly valve I 12 is connected to the hydraulic control port I 1101, and the tail end is connected to the three-way filter joint 13. The head end of the butterfly valve II 14 is connected to the hydraulic control port II 11 02 is connected, the tail end is connected to the three-way filter joint 13, the filter 16 is connected to the power mud inlet 1106, the hydraulic control channel 17 is connected to the three-way filter joint 13, the piston 28 includes: a piston surface 2801, a piston rod 2802, a piston lower end surface 2803, and a piston lower end surface 2804. The piston surface 2801, the piston rod 2802, the piston lower end surface 2803, and the piston upper end surface 2804 are all in contact with the inner wall of the flow channel switching device 11, the butterfly valve III 15 is connected to the pressure relief port I 1104, the butterfly valve IV 27 is connected to the pressure relief port II 1108, the head end of the drilling hose 1 is connected to the main circulation channel port 1110, and the tail end is connected to the top drive 3. The head end of the side circulation power channel 8 is connected to the side circulation channel port 1109, and the tail end is connected to the side circulation automatic connecting device 7;

[0048] The mud pumping subsystem consists of a drilling power channel 19, a drilling power pump 20, a hydraulically controlled power pump 21, a mud channel 23, and a mud pool 22: the drilling power channel 19 is connected to the filter 16 at its head end and to the drilling power pump 20 at its tail end; the drilling power pump 20 is connected to the mud pool 22 at its tail end; the hydraulically controlled power pump 21 is connected to the hydraulic control channel 17 at its head end and to the mud pool 22 at its tail end; and the mud channel 23 is connected to the mud pool 22;

[0049] The platform automatic control subsystem consists of a pressure sensor 9, a flow sensor 10, a data transmission line 24, an on-site automatic control console 25, a remote intelligent control center 26, and communication-related 30: the pressure sensor 9 is of a snap-on type and is respectively installed on the drilling water hose 1, the side circulation power channel 8, and the flow channel switching device 11; the flow sensor 10 is of a snap-on type and is respectively installed on the drilling water hose 1 and the side circulation power channel 8; the head end of the data transmission line 24 is connected to the pressure sensor 9 and the flow sensor 10, and the tail end is connected to the on-site automatic control console 25; the remote intelligent control center 26 realizes remote control of the wireless equipment and the on-site automatic control console 25 through the communication-related 30.

[0050] The side circulation automatic connection device 7 is mainly composed of a base 701, a rotating joint 702, a quick connector 704, a sensor 703, and a connecting cable 32 connected in sequence. It is connected to the platform automatic control subsystem and can achieve the maintenance and stability of any posture. The quick connection mechanism on the side circulation automatic connection device 7 can realize automatic rapid connection and disconnection with the continuous circulation valve 5 and leakage monitoring. The main circulation automatic connection device 31 is mainly composed of a fixed bracket 3101, a multi-degree-of-freedom joint 3102, a mechanical arm 3103, a clamping hand 3104, and a power cable 33 connected in sequence. It is connected to the platform automatic control subsystem and can achieve automatic connection and disconnection of the drill pipe 4 and the continuous circulation valve 5.

[0051] The three-way filter joint 13 can realize the mutual communication and cooperation between the hydraulic control port I 1101 and the hydraulic control port II 1102 in the flow channel switching device 11 by cooperating with the butterfly valve I 12 and the butterfly valve II 14;

[0052] The lower end surface 2803 of the piston 28 can achieve end surface sealing with the lower cover 1107 of the flow channel switching device 11, and the upper end surface 2804 of the piston 28 can achieve end surface sealing with the upper cover 1105 of the flow channel switching device 11;

[0053] The remote intelligent control center 26 can realize the automation of the entire process of drilling and connecting single roots, and has intelligent functions such as real-time data analysis and processing, fault prediction and diagnosis, and autonomous decision-making and optimized control under complex working conditions;

[0054] The present invention also provides a fully automatic mud continuous circulation method for tripping a drill string, comprising the following steps:

[0055] SⅠ, drilling, specifically including the following steps:

[0056] Sa. Running tools: Connect the drill bit, drill pipe 4 and continuous circulation valve 5 in sequence and then connect them to the top drive 3;

[0057] Sb. Vertical drilling: The three-way filter joint 13 is automatically controlled by the on-site automatic control console 25 or the remote intelligent control center 26 to communicate with each other through the butterfly valve I 12 and the butterfly valve II 14, so that the mud liquid passes through the hydraulic power pump 21, the hydraulic control channel 17, the three-way filter joint 13, and the butterfly valve I 12 in sequence, and then pushes the piston 28 to move downward. The mud stops when the lower end face 2803 of the piston 28 completes the end face sealing with the lower cover 1107 of the flow channel switching device 11. At this time, the mud liquid passes through the drilling power pump 20, the drilling power channel 19, and enters the flow channel switching device 11 in sequence, and is then transported to the top drive 3 by the drilling hose 1 for drilling operations.

[0058] SⅡ, connect the order, specifically including the following steps:

[0059] Sc. Close the main circulation: quickly connect the side circulation automatic connection device 7 to the continuous circulation valve 5, and automatically control the three-way filter joint 13 to communicate with the butterfly valve I 12 and the butterfly valve II 14 through the on-site automatic control console 25 or the remote intelligent control center 26, so that the mud liquid passes through the hydraulic power pump 21, the hydraulic control channel 17, the three-way filter joint 13, and the butterfly valve II 14 in sequence, and then pushes the piston 28 to move upward. When the upper end face 2804 of the piston 28 completes the end face sealing with the upper cover 1105 of the flow channel switching device 11, the piston stops, and the main circulation is closed;

[0060] Sd. Open the side circulation: After that, the mud fluid passes through the drilling power pump 20, the drilling power channel 19, the flow channel switching device 11, the side circulation power channel 8, and then enters the side circulation automatic connection device 7 and the continuous circulation valve 5 to realize the side circulation. The butterfly valve III 15 is automatically controlled by the on-site automatic control console 25 or the remote intelligent control center 26 to realize pressure relief;

[0061] Se. Connecting columns: Move the top drive 3 upwards by means of the crane 2, connect the drill pipe 4 and the continuous circulation valve 5 in sequence, and then connect them to the top drive 3 and then to the continuous circulation valve 5 that is undergoing side circulation.

[0062] SⅢ, drill down, specifically includes the following steps:

[0063] Sf. Close the side circulation: The on-site automatic control console 25 or the remote intelligent control center 26 automatically controls the three-way filter joint 13 to communicate with the butterfly valve I 12 and the butterfly valve II 14, so that the mud liquid passes through the hydraulic power pump 21, the hydraulic control channel 17, the three-way filter joint 13, and the butterfly valve I 12 in sequence, and then pushes the piston 28 to move downward. The piston 28 stops when the lower end face 2803 of the piston 28 completes the end face seal with the lower cover 1107 of the flow channel switching device 11. At this time, the side circulation is closed;

[0064] Sg. Open the main circulation: The mud fluid passes through the drilling power pump 20, the drilling power channel 19, and enters the flow channel switching device 11. It is then transported to the top drive 3 by the drilling hose 1 for drilling operations. The butterfly valve IV 27 is automatically controlled by the on-site automatic control console 25 or the remote intelligent control center 26 to achieve pressure relief.

[0065] SIV. Repeat the above steps Sc-Sg to complete the deep-sea continuous circulation drilling operation.

[0066] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0067] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" are based on the directions or positional relationships described in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0069] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0070] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications can be made based on the above descriptions. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications derived therefrom remain within the scope of protection of the present invention.

Claims

1. A fully automatic continuous mud circulation system for tripping and lowering a drill string, comprising a wellhead circulation subsystem, a manifold flow automatic control subsystem, a mud pumping subsystem, a platform automatic control subsystem, and a mud pumping subsystem, characterized by: The wellhead circulation subsystem is composed of a crane (2), a top drive (3), a drill pipe (4), a continuous circulation valve (5), a drilling platform (6), a side circulation automatic connection device (7), and a main circulation automatic connection device (31): the crane (2) is installed on the derrick, the top drive (3) is installed on the crane (2), and the top drive (3) provides torque for drilling, the drill pipe (4) is connected to the top drive (3) at its head end, and is connected to the continuous circulation valve (5) at its tail end, the continuous circulation valve (5) is connected to the drill pipe (4) at both ends, and is internally connected, the side circulation automatic connection device (7) is installed on the drilling platform (6), and the main circulation automatic connection device (31) is installed on the drilling platform (6); The manifold flow channel automatic control subsystem is composed of a flow channel switching device (11), a butterfly valve I (12), a three-pass filter joint (13), a butterfly valve II (14), a butterfly valve III (15), a filter (16), a hydraulic control channel (17), a butterfly valve IV (27), a piston (28), a pressure relief channel I (18), a pressure relief channel II (29), a drilling hose (1), and a side circulation power channel (8), and is skid-mounted in a vertical cabinet; The flow channel switching device (11) is vertical and comprises: a hydraulic control port I (1101), a hydraulic control port II (1102), a partition (1103), a pressure relief port I (1104), an upper cover (1105), a power mud inlet (1106), a lower cover (1107), a pressure relief port II (1108), a side circulation channel port (1109), and a main circulation channel port (1110). The butterfly valve I (12) is connected at its head end to the hydraulic control port I (1101) and at its tail end to the three-pass filter joint (13). The butterfly valve II (14) is connected at its head end to the hydraulic control port II (1102) and at its tail end to the three-pass filter joint (13). The filter (16) is connected to the power mud inlet (1106). The hydraulic control channel (17) is connected to the three-pass filter joint ( 13), the piston (28) comprises: a piston surface (2801), a piston rod (2802), a piston lower end surface (2803), and a piston lower end surface (2804); the piston surface (2801), the piston rod (2802), the piston lower end surface (2803), and the piston upper end surface (2804) are all in contact with the inner wall of the flow channel switching device (11); the butterfly valve III (15) is connected to the pressure relief port I (1104); the butterfly valve IV (27) is connected to the pressure relief port II (1108); the head end of the drilling hose (1) is connected to the main circulation channel port (1110), and the tail end is connected to the top drive (3); the head end of the side circulation power channel (8) is connected to the side circulation channel port (1109), and the tail end is connected to the side circulation automatic connection device (7); The mud pumping subsystem is composed of a drilling power channel (19), a drilling power pump (20), a hydraulically controlled power pump (21), a mud channel (23), and a mud pool (22): the drilling power channel (19) is connected to the filter (16) at its head end and to the drilling power pump (20) at its tail end; the drilling power pump (20) is connected to the mud pool (22) at its tail end; the hydraulically controlled power pump (21) is connected to the hydraulic control channel (17) at its head end and to the mud pool (22) at its tail end; and the mud channel (23) is connected to the mud pool (22); The platform automatic control subsystem is composed of a pressure sensor (9), a flow sensor (10), a data transmission line (24), an on-site automatic control console (25), a remote intelligent control center (26), and a communication related (30): the pressure sensor (9) is a snap-on type and is respectively installed on the drilling hose (1), the side circulation power channel (8), and the flow channel switching device (11); the flow sensor (10) is a snap-on type and is respectively installed on the drilling hose (1) and the side circulation power channel (8); the head end of the data transmission line (24) is connected to the pressure sensor (9) and the flow sensor (10), and the tail end is connected to the on-site automatic control console (25); the remote intelligent control center (26) realizes intelligent control of the on-site equipment and the on-site automatic control console (25) through the communication related (30). The side circulation automatic connection device (7) is mainly composed of a base (701), a rotating joint (702), a quick connector (704), a leakage sensor (703), and a connecting cable (32) connected in sequence, and is connected to the platform automatic control subsystem to achieve the maintenance and stability of any posture. The quick connection mechanism on the side circulation automatic connection device (7) can achieve automatic quick connection and disconnection with the continuous circulation valve (5) and leakage monitoring. The main circulation automatic connection device (31) is mainly composed of a fixed bracket (3101), a multi-degree-of-freedom joint (3102), a mechanical arm (3103), a clamping hand (3104), and a power cable (33) connected in sequence, and is connected to the platform automatic control subsystem to achieve automatic quick connection and disconnection between the drill pipe (4) and the continuous circulation valve (5). The three-pass filter joint (13) can realize the mutual communication and cooperation between the hydraulic control port I (1101) and the hydraulic control port II (1102) in the flow channel switching device (11) by cooperating with the butterfly valve I (12) and the butterfly valve II (14); The lower end surface (2803) of the piston (28) can achieve end surface sealing with the lower cover (1107) of the flow channel switching device (11), and the upper end surface (2804) of the piston (28) can achieve end surface sealing with the upper cover (1105) of the flow channel switching device (11).

2. A fully automatic continuous mud circulation method for tripping a drill string, characterized by: The following steps are involved: SⅠ, drilling, specifically including the following steps: Sa. Running tools: Connect the drill bit, drill pipe (4) and continuous circulation valve (5) in sequence and then connect them to the top drive (3); Sb. Vertical drilling: The on-site automatic control console (25) or the remote intelligent control center (26) automatically controls the three-way filter joint (13) to communicate with the butterfly valve I (12) and the butterfly valve II (14), so that the mud liquid passes through the hydraulic power pump (21), the hydraulic control channel (17), the three-way filter joint (13), and the butterfly valve I (12) in sequence, and then pushes the piston (28) to move downward. The operation stops when the lower end face (2803) of the piston (28) and the lower cover (1107) of the flow channel switching device (11) complete the end face sealing. At this time, the mud liquid passes through the drilling power pump (20), the drilling power channel (19), and enters the flow channel switching device (11), and is then transported to the top drive (3) by the drilling hose (1) for drilling operation; SⅡ, connect the order, specifically including the following steps: Sc. Close the main circulation: quickly connect the side circulation automatic connection device (7) to the continuous circulation valve (5), and the on-site automatic control console (25) or the remote intelligent control center (26) automatically controls the three-way filter joint (13) to communicate with the butterfly valve I (12) and the butterfly valve II (14), so that the mud liquid passes through the hydraulic power pump (21), the hydraulic control channel (17), the three-way filter joint (13), and the butterfly valve II (14) in sequence, and then pushes the piston (28) to move upward. When the upper end face (2804) of the piston (28) and the upper cover (1105) of the flow channel switching device (11) complete the end face sealing, the main circulation stops, and the main circulation is closed at this time; Sd, open the side circulation: After that, the mud fluid passes through the drilling power pump (20), the drilling power channel (19), enters the flow channel switching device (11), the side circulation power channel (8), and then enters the side circulation automatic connection device (7) and the continuous circulation valve (5) to realize the side circulation. The butterfly valve III (15) is automatically controlled by the on-site automatic control console (25) or the remote intelligent control center (26) to realize pressure relief; Se, connect the column: move the top drive (3) upwards by means of a crane (2), connect the drill pipe (4) and the continuous circulation valve (5) in sequence, and then connect it to the top drive (3), and then connect it to the continuous circulation valve (5) that is in the process of side circulation; SⅢ, drill down, specifically includes the following steps: Sf. Close the side circulation: automatically control the three-way filter joint (13) through the on-site automatic control console (25) or the remote intelligent control center (26) to communicate with each other through the butterfly valve I (12) and the butterfly valve II (14), so that the mud liquid passes through the hydraulic power pump (21), the hydraulic control channel (17), the three-way filter joint (13), and the butterfly valve I (12) in sequence, and then pushes the piston (28) to move downward. When the lower end face (2803) of the piston (28) and the lower cover (1107) of the flow channel switching device (11) complete the end face sealing, the side circulation stops, and at this time the side circulation is closed; Sg. Open the main circulation: the mud fluid passes through the drilling power pump (20), the drilling power channel (19), and enters the flow channel switching device (11), and is then transported to the top drive (3) by the drilling hose (1) for drilling operations. The butterfly valve IV (27) is automatically controlled by the on-site automatic control console (25) or the remote intelligent control center (26) to achieve pressure relief; SIV. Repeat the above steps Sc-Sg to complete the deep-sea continuous circulation drilling operation.

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