An injection head displacement system and method for underwater operations

Abstract

The application relates to a continuous pipe drilling machine technology field, and relates to an injection head displacement system for underwater operation, which comprises a control system, a derrick, a drum, a power mechanism and an injection head. A displacement mechanism is connected between the injection head and the derrick. The displacement mechanism comprises a pulley block connected with the injection head and used for controlling the vertical displacement of the injection head, a steel wire rope, a driving mechanism used for winding and unwinding the steel wire rope, and an electric cable electrically connected with the control system. The application can realize the integral displacement control of the injection head of the continuous pipe drilling machine by using a set of pulley block and hydraulic winch combination, can ensure that the continuous pipe and the well mouth are always centered, can guarantee the high efficiency of operation, and can realize the complete underwater operation process.

Description

Technical Field

[0001] This invention relates to the field of continuous tubular drilling rig technology, and more specifically to an injection head displacement system and method for underwater operations. Background Technology

[0002] my country is one of the countries in the world with the capability to drill to depths of 10,000 meters on land. As our understanding of the ocean deepens, humanity is moving from land to sea, from shallow to deep waters. Seawater reaching depths of thousands of meters separates the Earth's strata, and offshore drilling platforms are prohibitively expensive and uneconomical for developing new energy sources. Therefore, drilling equipment capable of underwater operations can effectively reduce costs and is receiving increasing attention and research.

[0003] Continuous tubing drilling involves winding drill pipes (continuous tubing) made of special materials around a huge cable car like a steel wire rope, enabling continuous drilling operations without changing the drill pipes.

[0004] The main equipment for coiled tubing drilling is a coiled tubing rig, which is equipped with a power system and coiled tubing wound around a drum. The ends of the coiled tubing are connected to a motor and a drill bit. The coiled tubing is a high-strength, high-toughness pipe material. Drilling fluid drives the downhole motor through the coiled tubing, which in turn rotates the drill bit below the motor to perform drilling. All equipment is mounted on a towable trailer, and the rig is towed by a standard trailer during relocation.

[0005] The biggest advantages of coiled tubing drilling compared to conventional drilling are: it eliminates the need for derricks used for many years, requiring less surface equipment and a smaller footprint; equipment relocation and installation are convenient, quick, and flexible, making it particularly suitable for surface or offshore platform operations with limited conditions, reducing site space and relocation costs; during drilling, no drill pipe connection is required, enabling continuous circulation of drilling fluid, eliminating the conventional tripping of the drill string in rotary drilling, improving drilling speed and safety, and significantly shortening the drilling cycle; coiled tubing drilling is particularly suitable for small-diameter drilling, sidetracking of old wells, and deepening of old wells; because small-diameter wells use less drilling fluid, it reduces pollution to the surrounding environment; the coiled tubing is an integrated drill pipe without joints, which is beneficial for underbalanced pressure drilling; and the installation of cables inside the coiled tubing creates conditions for closed-loop drilling downhole.

[0006] This technology originated in the early 1990s. In 1991, the United States, Canada, France, and other countries successively tested coiled tubing drilling. In recent years, the advent of high-strength, large-diameter coiled tubing, small-diameter positive displacement motors, and diamond drill bits has greatly promoted the development and application of coiled tubing drilling technology. Currently, coiled tubing drilling technology continues to maintain a strong growth momentum worldwide, with the number of wells drilled using coiled tubing increasing year by year.

[0007] Therefore, the combination of coiled tubing drilling rigs and underwater operations has created subsea drilling equipment, which reduces the complexity of subsea drilling operations, reduces the cost-effectiveness ratio, improves operational efficiency, and ensures operational safety and reliability. It is a key piece of equipment for realizing shallow drilling in deep water.

[0008] Conventional drilling uses a traveling system and a hoisting system to lift and lower the drill string, enabling drilling, casing installation, and cementing operations. For coiled tubing drilling, onshore drilling typically uses a crane to lift the injection head. This method makes it difficult to effectively control the lifting and lowering trajectory of the injection head, leading to centering difficulties during coiled tubing drilling. Furthermore, the crane method is unsuitable for offshore drilling. However, if offshore drilling requires casing installation, conventional drilling rigs are still used because coiled tubing rigs lack traveling and hoisting systems. Therefore, this incurs significantly higher construction costs.

[0009] To address the issues of coiled tubing drilling rigs lacking a traversing and hoisting system, resulting in high construction difficulty, high costs, low efficiency, and compromised quality during offshore operations, this paper proposes an injection head relocation system and method for subsea drilling, combining the advantages of coiled tubing drilling with the characteristics of underwater operations, to meet the needs of coiled tubing drilling rigs in achieving the entire drilling process. Summary of the Invention

[0010] To address the problems of existing technologies, this invention provides an injection head relocation system and method for underwater operations. Using only a combination of a pulley block and a hydraulic winch, the overall relocation control of the injection head of a coiled tubing drilling rig can be achieved, ensuring that the coiled tubing is always aligned with the wellhead and guaranteeing high operational efficiency, thereby enabling a complete underwater operation process.

[0011] To solve the above problems, the technical solution of the present invention is as follows:

[0012] An injection head shifting system for underwater operations includes a control system, a derrick, a drum fixed to the top of the derrick for winding a continuous tube, a power mechanism for driving the drum to rotate, and an injection head sleeved on the outside of the continuous tube. A shifting mechanism is connected between the injection head and the derrick. The shifting mechanism includes a pulley block and a wire rope connected to the injection head for controlling the vertical displacement of the injection head, and a drive mechanism for winding and unwinding the wire rope. The drive mechanism is electrically connected to the control system via a cable.

[0013] Preferably, the driving mechanism is a hydraulic winch fixedly installed on one side of the bottom inside the derrick, and the configuration method of the pulley block includes mode one and mode two; the top of the derrick is provided with a guide rail extending downward in the longitudinal direction, the continuous tube extends downward along the guide rail, the injection head is coaxial with the continuous tube and sleeved on the outside of the guide rail, and the injection head has a cubic structure.

[0014] Preferably, in Mode 1, the pulley block includes a first pulley, the axis of which is perpendicular to the axis of the continuous tube located within the guide rail and is located above the top of the guide rail. The axis of the first pulley is perpendicular to the plane containing the front or rear end of the injection head. A second pulley and a third pulley are provided at the middle of the left and right edges of the top of the injection head. A fourth pulley and a fifth pulley are symmetrically provided at the top of the derrick on both sides of the continuous tube. The axes of the second, third, fourth, and fifth pulleys are parallel to the axis of the first pulley. The wire rope is output from the hydraulic winch, passes sequentially around the fifth pulley, the third pulley, the first pulley, the second pulley, and the fourth pulley, and is fixedly connected to the bottom of the derrick away from the hydraulic winch. The axis of the wire rope is coplanar with the axis of the continuous tube located within the guide rail.

[0015] Preferably, the wire rope between the hydraulic winch and the fifth pulley, and the wire rope between the fourth pulley and the bottom of the derrick are both vertically arranged.

[0016] Preferably, in Mode 1, the method for calculating the change in wire rope length includes:

[0017] S1. The calculation of the initial position wire rope length is shown in equation (1):

[0018]

[0019] The initial position refers to the position where the bottom end of the injection head is flush with the upper surface of the bottom of the derrick under the traction of the wire rope. In formula (1), l z h1 is the length of the wire rope at the initial position, h2 is the vertical height of the derrick, h3 is the vertical distance from the center of the pulley at the top of the derrick to the center of the pulley at the top of the injection head, l1 is the horizontal distance from the center of the pulley at the top of the derrick to the center of the pulley at the top of the injection head, l2 is the horizontal distance from the center of the pulley at the top of the injection head to the center of the pulley at the bottom of the derrick on the same side, and d is the diameter of the pulley groove.

[0020] S2. When the injection head rises to a certain height h, calculate the length of the wire rope at this time, as shown in equation (2):

[0021]

[0022] In equation (2), l z1 Let h be the length of the wire rope when the injection head is raised to a certain height, and h be the vertical distance the injection head is raised. The other parameters are the same as in formula (1).

[0023] The control system calculates the length of the wire rope according to equations (1) and (2) and uses this to control the position of the injection head.

[0024] Preferably, in the second mode, the pulley system includes pulley 1, pulley 2, pulley 3, pulley 4, pulley 5, pulley 6, and pulley 7. Pulleys 4, 5, 6, and 7 are arranged in a rectangle and installed at the four corners of the upper end of the injection head. The axes of pulleys 4, 5, 6, and 7 are parallel to the same side of the injection head. Pulleys 1, 2, and 3 are sequentially installed directly above pulleys 7, 6, and 5. The axes of pulleys 2 and 3 are perpendicular to the axes of pulleys 4, 5, 6, and 7. The axis of pulley 1 is parallel to the axis of pulley 7. The axes of pulleys 1, 2, and 3 are located in the same plane, and the axes of pulleys 4, 5, 6, and 7 are located in the same plane. The wire rope is output upward from the hydraulic winch, passes over pulley 1, extends vertically downward and passes over pulley 7, extends horizontally and passes over pulley 6, extends vertically upward and passes over pulley 2, extends horizontally and passes over pulley 3, extends vertically downward and passes over pulley 5, extends horizontally and passes over pulley 4, and extends vertically upward and is fixedly connected to the derrick. The four vertical wire rope sections are of the same length.

[0025] Preferably, in Mode 2, when the injection head rises to a certain height h, the length of the wire rope changes to 4h, and the control system controls the lifting height of the injection head based on the relationship between the wire rope and the height of the injection head.

[0026] A method of using an injection head shifting system for underwater operations includes the following steps:

[0027] (1) Assemble the injection head displacement system for underwater operations on the ship and connect the drill bit mechanism to the end of the coiled tubing via the drill string; (2) Control the drum rotation via the power mechanism to lower the drill bit mechanism to the seabed; lower the injection head to a certain depth by rotating the hydraulic winch; (3) Drill the seabed surface layer via the drill bit mechanism and install the guide pipe; (4) The drill bit mechanism continues to drill to the expected depth; (5) Raise the coiled tubing by rotating the drum via the power mechanism; (6) Raise the injection head to a certain height by rotating the hydraulic winch and remove the drill string; (7) Connect the upper end of the casing via the lifting device at the lower end of the injection head, install the lower end of the casing with the iron driller's hook, and then lower the injection head via rotating the hydraulic winch to lower the casing to the wellhead; (8) Repeat steps (6) and (7) to connect and lower the casing by raising and lowering the injection head; (9) After the casing is installed, cement it using the cementing equipment to complete the operation.

[0028] The present invention provides an injection head relocation system and method for underwater operations, which has the following advantages: The present invention uses only a combination of a pulley block and a hydraulic winch to realize the overall relocation control of the injection head of the coiled tubing drilling rig, ensure that the coiled tubing is always aligned with the wellhead, and guarantee the high efficiency of the operation, thereby enabling the complete underwater operation process. Attached Figure Description

[0029] Figure 1 A schematic diagram of the front structure of the present invention;

[0030] Figure 2 The right view of the present invention;

[0031] Figure 3 A schematic diagram of Mode 1 of the present invention;

[0032] Figure 4 One of the diagrams for calculating the length of the steel wire rope in Mode 1 of this invention;

[0033] Figure 5 One of the diagrams for calculating the length of the steel wire rope in Mode 1 of this invention;

[0034] Figure 6 1. Schematic diagram of Mode 2 of the present invention.

[0035] 1. Drum; 2. Pulley mounting bracket; where 2-1, 2-2, 2-3, 2-4, and 2-5 are all pulley brackets; 3. Pulley; 3-1, First pulley; 3-2, Fifth pulley; 3-3, Fourth pulley; 3-4, Second pulley; 3-5, Third pulley; 3-11, Pulley 1; 3-12, Pulley 2; 3-13, Pulley 3; 3-14, Pulley 4; 3-15, Pulley 5; 3-16, Pulley 6; 3-17, Pulley 7; 4. Continuous tubing; 5. Derrick; 6. Guide rail; 7. Wire rope; 8. Injection head; 9. Hydraulic winch; 10. Pulley. Detailed Implementation

[0036] The following description provides a detailed explanation of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limiting this invention.

[0038] Example 1

[0039] An injection head shifting system for underwater operations, such as Figure 1-6 As shown, the system includes a control system, a derrick 5, a drum 1 fixedly mounted on the top of the derrick 5 for winding the continuous pipe 4, a power mechanism (not shown) for driving the drum to rotate, and an injection head 8 sleeved on the outside of the continuous pipe. The injection head 8 is connected to the derrick by a displacement mechanism. The displacement mechanism includes a pulley block and a wire rope connected to the injection head for controlling the vertical displacement of the injection head, and also includes a drive mechanism for winding and unwinding the wire rope. The drive mechanism is electrically connected to the control system via a cable.

[0040] Example 2

[0041] Based on Example 1, this example further discloses:

[0042] like Figure 1 As shown, the driving mechanism is a hydraulic winch 9 fixedly installed on one side of the bottom inside the derrick 5. The configuration method of the pulley block includes mode one and mode two. The top of the derrick 5 is provided with a guide rail 6 extending downward in the longitudinal direction. The continuous tube 4 extends downward along the guide rail 6. The injection head 8 is coaxial with the continuous tube 4 and sleeved on the outside of the guide rail 6. The injection head 8 has a cubic structure.

[0043] Example 3

[0044] Based on Example 2, this example further discloses:

[0045] like Figure 1-5 As shown, in Mode 1, the pulley block includes a first pulley 3-1. The axis of the first pulley 3-1 intersects perpendicularly with the axis of the continuous tube located inside the guide rail and is located above the top of the guide rail 6. The axis of the first pulley 3-1 is perpendicular to the plane containing the front or rear end of the injection head 8. A second pulley 3-4 and a third pulley 3-5 are provided at the middle of the left and right edges of the top of the injection head 8. A fourth pulley 3-3 and a fifth pulley 3-2 are symmetrically provided at the top of the derrick 5 on both sides of the continuous tube 4. The axes of the second, third, fourth, and fifth pulleys are parallel to the axis of the first pulley. The wire rope is output from the hydraulic winch, passes sequentially around the fifth pulley 3-2, the third pulley 3-5, the first pulley 3-1, the second pulley 3-4, and the fourth pulley 3-3, and is fixedly connected to the bottom of the derrick away from the hydraulic winch. The axis of the wire rope is coplanar with the axis of the continuous tube located inside the guide rail.

[0046] Example 4

[0047] Based on Example 3, this example is further improved as follows:

[0048] like Figure 1-5 As shown, the wire rope between the hydraulic winch and the fifth pulley 3-2, and the wire rope between the fourth pulley 3-3 and the bottom of the derrick are all vertically arranged.

[0049] Example 5

[0050] Based on Example 4, this example discloses:

[0051] like Figure 1-5 As shown, in Mode 1, the calculation method for the change in wire rope includes:

[0052] S1. The calculation of the initial position wire rope length is shown in equation (1):

[0053]

[0054] The initial position refers to the position where the bottom end of the injection head is flush with the upper surface of the bottom of the derrick under the traction of the wire rope. In formula (1), l z h1 is the length of the wire rope at the initial position, h2 is the vertical height of the derrick, h3 is the vertical distance from the center of the pulley at the top of the derrick (first pulley 3-1) to the center of the pulley at the top of the injection head, l1 is the horizontal distance from the center of the pulley at the top of the derrick to the center of the pulley at the top of the injection head, l2 is the horizontal distance from the center of the pulley at the top of the injection head to the center of the pulley at the bottom of the derrick on the same side, and d is the diameter of the pulley groove.

[0055] S2. When the injection head rises to a certain height h, calculate the length of the wire rope at this time, as shown in equation (2):

[0056]

[0057] In equation (2), l z1 Let h be the length of the wire rope when the injection head is raised to a certain height, and h be the vertical distance the injection head is raised. The other parameters are the same as in formula (1).

[0058] The control system calculates the length of the wire rope according to equations (1) and (2) and uses this to control the position of the injection head.

[0059] It should be noted that the length of the wire rope mentioned in this embodiment refers to the length of the wire rope used in the operation, and does not include the portion of the wire rope wound on the hydraulic winch. The raising of the injection head to a certain height is also based on the initial position of the injection head.

[0060] Example 6

[0061] Based on Example 2, this example discloses:

[0062] like Figure 6 As shown, in Mode 2, the pulley system includes pulley 1 (3-11), pulley 2 (3-12), pulley 3 (3-13), pulley 4 (3-14), pulley 5 (3-15), pulley 6 (3-16), and pulley 7 (3-17). Pulleys 4 (3-14), 5 (3-15), 6 (3-16), and 7 (3-17) are arranged in a rectangular pattern and installed at the four corners of the upper end of the injection head. Furthermore, pulleys 4 (3-14), 5 (3-15), and 6 (3-16) are arranged in a rectangular pattern and installed at the four corners of the upper end of the injection head. The axes of pulleys 6-16 and 7-17 are parallel to the same side of the injection head. Pulleys 1-11, 2-12, and 3-13 are sequentially installed directly above pulleys 7-17, 6-16, and 5-15. The axes of pulleys 2-12 and 3-13 are aligned with the axes of pulleys 4-14, 5-15, 6-16, and 7-17. The lines are perpendicular, and the axis of pulley 1 (3-11) is parallel to the axis of pulley 7 (3-17). The axes of pulley 1 (3-11), pulley 2 (3-12), and pulley 3 (3-13) are located in the same plane. The axes of pulley 4 (3-14), pulley 5 (3-15), pulley 6 (3-16), and pulley 7 (3-17) are located in the same plane. The wire rope is output upward from the hydraulic winch, passes over pulley 1 (3-11), and further extends vertically downward and passes over pulley 7 (3-17). It further extends horizontally and passes over pulley 6 (3-16), and further extends vertically upward and passes over pulley 2 (3-12). It further extends horizontally and passes over pulley 3 (3-13), and further extends vertically downward and passes over pulley 5 (3-15). It further extends horizontally and passes over pulley 4 (3-14). It further extends vertically upward and is fixedly connected to the derrick. The four vertical wire rope sections are of the same length.

[0063] Example 7

[0064] Based on Example 6, this example discloses:

[0065] like Figure 6 As shown, in Mode 2, when the injection head is raised to a certain height h, the length of the wire rope changes to 4h. The control system controls the lifting height of the injection head based on the relationship between the wire rope and the height of the injection head.

[0066] Example 8

[0067] A method of using an injection head shifting system for underwater operations includes the following steps:

[0068] (1) Assemble the injection head displacement system for underwater operations on the ship and connect the drill bit mechanism to the end of the coiled tubing via the drill string; (2) Control the drum rotation via the power mechanism to lower the drill bit mechanism to the seabed; lower the injection head to a certain depth by rotating the hydraulic winch; (3) Drill the seabed surface layer via the drill bit mechanism and install the guide pipe; (4) The drill bit mechanism continues to drill to the expected depth; (5) Raise the coiled tubing by rotating the drum via the power mechanism; (6) Raise the injection head to a certain height by rotating the hydraulic winch and remove the drill string; (7) Connect the upper end of the casing via the lifting device at the lower end of the injection head, install the lower end of the casing with the iron driller's hook, and then lower the injection head via rotating the hydraulic winch to lower the casing to the wellhead; (8) Repeat steps (6) and (7) to connect and lower the casing by raising and lowering the injection head; (9) After the casing is installed, cement it using the cementing equipment to complete the operation.

[0069] It should be noted that the pulleys of the present invention are all connected to the derrick through pulley supports. In addition, coiled tubing drilling technology is existing technology, and the contents not mentioned in the present invention are solved by existing technology.

Claims

1. An injection head shifting system for underwater operations, characterized in that: The system includes a control system, a derrick, a drum fixed at the top of the derrick for winding the continuous pipe, a power mechanism for driving the drum to rotate, and an injection head sleeved on the outside of the continuous pipe. The injection head is connected to the derrick by a displacement mechanism, which includes a pulley block and a wire rope connected to the injection head for controlling the vertical displacement of the injection head, and a drive mechanism for winding and unwinding the wire rope. The drive mechanism is electrically connected to the control system via a cable. The driving mechanism is a hydraulic winch fixedly installed on one side of the bottom inside the derrick. The configuration method of the pulley block includes mode one and mode two. The top of the derrick is provided with a guide rail extending downward in the longitudinal direction. The continuous tube extends downward along the guide rail. The injection head is coaxial with the continuous tube and is sleeved on the outside of the guide rail. The injection head has a cubic structure. In Mode 1, the pulley block includes a first pulley. The axis of the first pulley is perpendicular to the axis of the continuous tube located inside the guide rail and is located above the top of the guide rail. The axis of the first pulley is perpendicular to the plane containing the front or rear end of the injection head. A second pulley and a third pulley are provided at the middle of the left and right side edges of the top of the injection head. A fourth pulley and a fifth pulley are symmetrically provided at the top of the derrick on both sides of the continuous tube. The axes of the second, third, fourth, and fifth pulleys are parallel to the axis of the first pulley. The wire rope is output from the hydraulic winch, passes around the fifth pulley, third pulley, first pulley, second pulley, and fourth pulley in sequence, and is fixedly connected to the bottom of the derrick away from the hydraulic winch. The axis of the wire rope is coplanar with the axis of the continuous tube located inside the guide rail. In Mode 1, the calculation method for the change in wire rope length includes: S1. The calculation of the initial position wire rope length is shown in equation (1): （1）； The initial position refers to the position where, under the traction of the wire rope, the bottom end of the injection head is flush with the upper surface of the bottom of the derrick. In equation (1), l z The length of the wire rope at the initial position. h 1 represents the vertical height of the derrick. h 2 represents the vertical distance from the center of the pulley at the top of the derrick to the center of the pulley at the top of the injection head. h 3 represents the vertical distance from the center of the pulley at the top of the injection head to the top of the derrick. l 1 represents the horizontal distance from the center of the upper pulley at the top of the derrick to the center of the top pulley at the top of the injection head. l 2 represents the horizontal distance from the center of the top pulley of the injection head to the center of the pulley at the lower end of the top of the derrick on the same side. d The diameter of the pulley groove; S2. When the injection head rises to a certain height h, calculate the length of the wire rope at this time, as shown in equation (2): （2）； In equation (2), l z1 This refers to the length of the wire rope when the injection head is raised to a certain height. h The vertical distance at which the injection head rises is given, and the other parameters are the same as in equation (1). The control system calculates the length of the wire rope according to equations (1) and (2), and controls the position of the injection head accordingly; In Mode Two, the pulley system includes pulleys 1, 2, 3, 4, 5, 6, and 7. Pulleys 4, 5, 6, and 7 are arranged in a rectangle and installed at the four corners of the upper end of the injection head. The axes of pulleys 4, 5, 6, and 7 are parallel to the same side of the injection head. Pulleys 1, 2, and 3 are sequentially installed directly above pulleys 7, 6, and 5. The axes of pulleys 2 and 3 are perpendicular to the axes of pulleys 4, 5, 6, and 7, while the axis of pulley 1 is parallel to the axis of pulley 7. The axes of pulley 1, pulley 2, and pulley 3 are located in the same plane, and the axes of pulley 4, pulley 5, pulley 6, and pulley 7 are located in the same plane. The wire rope is output upward from the hydraulic winch, passes over pulley 1, extends vertically downward and passes over pulley 7, extends horizontally and passes over pulley 6, extends vertically upward and passes over pulley 2, extends horizontally and passes over pulley 3, extends vertically downward and passes over pulley 5, extends horizontally and passes over pulley 4, and extends vertically upward and is fixedly connected to the derrick. The four vertical wire rope sections are of the same length. In Mode 2, when the injection head is raised to a certain height h, the length of the wire rope changes to 4h. The control system controls the lifting height of the injection head based on the relationship between the wire rope and the height of the injection head.

2. The injection head shifting system for underwater operations as described in claim 1, characterized in that: The steel wire rope between the hydraulic winch and the fifth pulley, and the steel wire rope between the fourth pulley and the bottom of the derrick are all vertically installed.

3. A method of using an injection head shifting system for underwater operations, characterized in that, The injection head shifting system for underwater operations as described in claim 1 includes the following steps: (1) Assemble the injection head displacement system for underwater operations on the ship and connect the drill bit mechanism to the end of the coiled tubing via the drill string; (2) Control the drum rotation via the power mechanism to lower the drill bit mechanism to the seabed; lower the injection head to a certain depth by rotating the hydraulic winch; (3) Drill the seabed surface layer via the drill bit mechanism and install the guide pipe; (4) The drill bit mechanism continues to drill to the expected depth; (5) Raise the coiled tubing by rotating the drum via the power mechanism; (6) Raise the injection head to a certain height by rotating the hydraulic winch and remove the drill string; (7) Connect the upper end of the casing via the lifting device at the lower end of the injection head, install the lower end of the casing with the iron driller's hook, and then lower the injection head via rotating the hydraulic winch to lower the casing to the wellhead; (8) Repeat steps (6) and (7) to connect and lower the casing by raising and lowering the injection head; (9) After the casing is installed, cement it using the cementing equipment to complete the operation.

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