Land-to-sea directional drilling deep sea drill rod landing receiving adjustable bracket device and method

Abstract

The invention relates to a land-to-sea directional drilling deep sea drill rod landing receiving adjustable bracket device and method. The device comprises a large cantilever bracket structure, an angle-adjustable hinge device connected with a ship body, a bottom support device on a bracket, a steel wire rope cable-stayed system for controlling longitudinal deformation and a vertical truss system of a ship body anchoring steel wire rope. The method comprises the following steps of: (1) analyzing a numerical curve of the drill rod going out of the sea bed; (2) welding and assembling a bracket and a stand column anchoring truss structure; (3) mounting a bracket; (4) finely adjusting the bracket; and (5) drilling rod unearthing and connection. According to the device and the method, on the receiving ship position-adjustable bracket receiving device, the span of large height difference and large-span drill rod landing connection is directly reduced through the effect of the adjustable bracket bottom support, deformation and stress of the drill rod are greatly reduced, meanwhile, the self-adaptive bottom bottom support of the bracket adapts to the S-shaped deformation form of drill rod landing, and the device and the method are convenient to use. And deformation coordination of landing of the drill rod is ensured.

Description

Technical Field

[0001] The invention relates to an offshore pipeline construction device and method, in particular to a land-to-sea directional drilling deep-sea drill pipe landing receiving adjustable bracket device and method suitable for the construction of submarine cable landing engineering. Background Art

[0002] With the rapid growth of offshore wind power installed capacity, the scale of offshore wind farm reserve projects has declined. At the same time, affected by multiple factors such as offshore aquaculture, fishing, route development, tightening ecological constraints and increased other sea use demands, the development and utilization of offshore wind power resources has approached saturation. The open sea has a wider scope for development, richer wind energy resources, and better wind speed and frequency. my country's offshore wind power is accelerating its development towards long-distance and open sea areas.

[0003] The landing construction in traditional submarine cable laying construction includes the straight-line landing method and the "Ω" floating and sinking landing method, which are suitable for shallow waters and short landing distances. They can no longer meet the engineering needs of deep seas, especially for a large number of transmission lines that need to cross ultra-long intertidal zones. In addition, traditional submarine cable landing operations face the problems of long construction period, high cost, high risk and great environmental impact.

[0004] In view of the increasingly complex environment and stricter environmental protection requirements faced by deep-sea cable landing operations, combined with the current development of "trenchless technology" horizontal directional drilling technology, a certain offshore wind power project actively develops large-caliber long-distance land and sea horizontal directional drilling technology. The project line crosses a length of 1650m and the multi-stage expansion is to 1.3m. In the seabed area, the water depth is more than 30m. Combined with the conventional control of the directional drilling drill pipe outlet angle of about 8°, the span from the drill pipe out of the seabed to the landing receiving ship is 200m.

[0005] In the condition of large height difference between the drilling platform and the seabed, the deepwater submarine pipeline drill pipe presents high bending stress, large curvature deformation, high tension state and complex stress condition. The drill pipe has large displacement deformation and high stress state, so that the drill pipe is prone to fracture, which in turn causes engineering quality and safety hazards.

[0006] In order to solve the problems of large deformation, high stress and easy fracture of receiving and connecting drill pipes for land-sea directional drilling in deep water areas, it is necessary to adopt an adjustable bracket device and method for landing and receiving deep-sea drill pipes for land-to-sea directional drilling, which includes a steel pipe truss large boom bracket structure, an articulated device connected to the hull with an adjustable angle, a steel wire rope inclined pulling system for controlling longitudinal deformation, and a vertical truss system for anchoring steel wire ropes on the hull, etc.

[0007] During on-site implementation, the maximum wall adjustment length of the adjustable bracket is determined by calculation, and combined with the water outlet angle of the borehole, the bracket is lowered by wire rope for angle docking to ensure adaptive contact of the drill pipe on the bracket.

[0008] The adjustable bracket bottom support directly reduces the span of the large height difference and large span drill pipe landing connection, greatly reducing the deformation and stress of the drill pipe. At the same time, the bracket's adaptive bottom support adapts to the "S" deformation of the drill pipe landing, ensuring the deformation coordination of the drill pipe landing. It provides a guarantee for the safe, green and efficient construction of long-distance land-to-sea horizontal directional drilling submarine cable landing. Summary of the invention

[0009] In order to solve the problems of large deformation, high stress and easy fracture of drill pipe receiving connection in land and sea directional drilling in deep water areas, the present invention proposes an adjustable bracket device and method for landing and receiving deep-sea drill pipes for land-to-sea directional drilling, through an adjustable bracket receiving device at the receiving ship position, including a steel pipe truss large boom bracket structure, an articulated device connected to the hull with an adjustable angle, a steel wire rope inclined system for controlling longitudinal deformation, and a vertical truss system for anchoring steel wire ropes to the hull.

[0010] To achieve the above object, the technical solution of the present invention is: an adjustable bracket device for landing and receiving deep-sea drill pipes for land-to-sea directional drilling, comprising a steel pipe truss large boom bracket structure, an articulated device connected to the hull with an adjustable angle, a bottom support device on the bracket, a steel wire rope inclined pull system for controlling longitudinal deformation, and a vertical truss system for anchoring steel wire ropes to the hull,

[0011] The steel tube truss cantilever bracket structure is composed of an upper chord, a lower chord and an intermediate truss rod. The steel tube truss cantilever bracket is provided with an arc system with a high middle part and low ends.

[0012] The bottom support device is welded on the large boom bracket structure with open oblique limit rods on both sides, and a horizontal bar with adjustable elevation is placed on it, on which a "C"-shaped rubber pad is placed to ensure adaptive contact of the drill rod on the bracket and reduce contact friction;

[0013] The angle-adjustable hinge device connected to the hull is formed by inserting cylindrical pins and washers through the middle opening to form a rotatable hinge device;

[0014] The steel wire rope inclined pulling system is composed of 4 groups of steel strands, of which 2 groups are inclined in 2 rows and are inclined on the upper chord of the bracket, and the horizontal position is controlled at the L / 2 and 3 / 4L span points of the bracket; through the inclined pulling fulcrum of the steel strand, the deformation and stability of the large boom bracket structure itself are effectively controlled, and at the same time, the angle of the bracket can be adjusted by lowering and lifting the steel strand to adapt to the receiving form of the supporting drill pipe;

[0015] The vertical truss system of the ship hull anchoring wire rope is composed of column steel pipes and truss rod steel pipes; the bottom of the column steel pipe is welded to the ship deck, and diagonal braces are set on both sides for limiting, forming an end anchoring system for anchoring the inclined steel strands.

[0016] Furthermore, the upper chord rod is made of φ100×4mm steel pipe, and the truss rod is made of φ60×3mm steel pipe.

[0017] Furthermore, the material of the ship ear plate and the bracket ear plate is Q345, the thickness t is 20 to 36 mm, the width-to-thickness ratio of both sides of the ear plate is less than or equal to 4, and it is fully welded to the hull and the bracket at both ends, and the diameter D of the solid cylindrical pin shaft is 8 to 12 cm.

[0018] Furthermore, each group of steel strands uses 8 to 12 parallel φ15.2 steel strands.

[0019] Furthermore, the column steel pipe is a φ100×4mm steel pipe, and the truss rod steel pipe is a φ60×3mm steel pipe.

[0020] A construction method for a land-to-sea directional drilling deep-sea drill pipe landing receiving adjustable bracket device, the steps of which are:

[0021] S1: Numerical curve analysis of the seabed configuration of drill pipes

[0022] Combined with the water depth in the deep water area and the water exit angle of the drill pipe, the combined effects of deadweight, buoyancy, water-filled load, ocean current force, etc. are comprehensively considered to conduct numerical curve analysis of the position from the drill pipe excavation point to the receiving ship area. Based on the ultimate stress and deformation control standard of the drill pipe material, the maximum span of the drill pipe in water is determined, and then the total length of the bracket support arm is determined;

[0023] S2: Welding assembly bracket and column anchor truss structure

[0024] Weld the column anchor truss and assemble the bracket structure on the ship platform, weld the connecting ear plate at the bracket port, weld the upper interval s<2m to set the two sides of the bottom bracket device to open the oblique limit rods, weld the lifting ears at 0.5L and 0.75L of the bracket to be inclined by the subsequent wire rope buckle cable, L is the total length of the bracket;

[0025] S3: Mounting bracket

[0026] The bracket is lowered and installed with the assistance of a crane. The bracket port is rotatably hinged through the bracket ear plate, the ship ear plate and the cylindrical pin shaft. One end of the 2 rows and 2 groups of inclined steel wire ropes are connected to the top of the ship deck column and the other end is connected to the L / 2 and 3 / 4L span points of the bracket. The steel strand cable is used to pull the supporting point to effectively control the deformation and stability of the large boom bracket structure itself.

[0027] S4: Bracket fine adjustment

[0028] Further accurately lower and raise the strands, and adjust the angle of the bracket to adapt to the receiving form of the supporting drill pipe;

[0029] S5: Drill pipe unearthed and connected

[0030] Observe the directional drilling control system of the drill pipe to ensure that the drill pipe excavation angle is controlled at 8°±2°; after the drill bit is excavated from the seabed near the excavation point, use an air compressor with a displacement of 30 cubic meters / minute to inject air from the drill pipe to blow away the seabed mud. After the diver finds the drill bit along the bubbles and determines the excavation position, marks and collects the coordinates, the drill pipe is towed to the bracket, guided and towed to the ship deck through the bracket bottom support device, and finally connected to the receiving drilling rig on the ship.

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

[0032] Aiming at the problems of large deformation, high stress and easy fracture of the receiving connection of the drill pipe of land-sea directional drilling in deep water areas during deep-sea cable landing operations, the present invention proposes an adjustable bracket device and method for receiving the landing of deep-sea drill pipe of land-to-sea directional drilling. The adjustable bracket receiving device at the receiving ship position directly reduces the span of the large height difference and large-span drill pipe landing connection through the adjustable bracket bottom support, greatly reducing the deformation and stress of the drill pipe. At the same time, the adaptive bottom support of the bracket adapts to the "S" deformation form of the drill pipe landing, ensuring the deformation coordination of the landing of the drill pipe. It provides a guarantee for the safe, green and efficient construction of long-distance land-to-sea horizontal directional drilling submarine cable landing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a longitudinal section of the auxiliary connection of the deepwater drill pipe bracket;

[0034] Figure 2 is a cross-sectional view of the bracket AA;

[0035] Figure 3 It is a detailed drawing of the hinged device connected by the bracket. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 3 As shown, an adjustable bracket device for landing and receiving deep-sea drill pipes for land-to-sea directional drilling of the present invention mainly includes a steel pipe truss large boom bracket structure 1, an articulated device 2 connected to the hull with an adjustable angle, a bottom support device 3 on the bracket, a steel wire rope inclined system for controlling longitudinal deformation, and a vertical truss system 4 for anchoring the steel wire rope to the hull.

[0038] The steel tube truss cantilever arm bracket structure 1 is composed of an upper chord, a lower chord and an intermediate truss rod. The upper chord rod is made of φ100×4mm steel pipe, and the truss rod is made of φ60×3mm steel pipe. Combined with the drill pipe landing, it presents an "S" shape. The cantilever arm bracket is set up in an arc system with a high middle and low ends.

[0039] The bottom support device 2 is welded on the steel tube truss large boom bracket structure 1 by the oblique limit rods 2-1 opened on both sides, and the horizontal adjustable elevation cross bar 2-2 is placed on it, and the "C" shaped rubber pad 2-3 is placed on it to ensure the adaptive contact of the drill pipe on the bracket and reduce the contact friction resistance.

[0040] The hinged device 3 connected to the hull with an adjustable angle is formed by inserting a solid cylindrical pin 3-3 and a gasket 3-4 through a middle opening into two ship connecting lug plates 3-1 connected to the stern and two bracket lug plates 3-2 connected to the bracket to form a rotatable hinged device. The lug plate material is Q345, the thickness t is controlled to be 20 to 36 mm, the width-to-thickness ratio b / t on both sides of the lug plate is controlled to be less than or equal to 4, and it is fully welded with the hull and the bracket at both ends, and the diameter D of the solid cylindrical pin 3-3 is controlled to be 8 to 12 cm.

[0041] The steel wire rope inclined system is composed of four groups of steel strands 5, of which two groups are inclined in two rows on the upper chord of the bracket, and the horizontal position is controlled at the L / 2 and 3 / 4L span points of the bracket. Each group of steel strands 5 uses 8 to 12 parallel φ15.2 steel strands. Through the inclined support of the steel strands 5, the deformation and stability of the steel pipe truss cantilever bracket structure 1 itself are effectively controlled. At the same time, through the lowering and lifting of the steel strands 5, the angle of the bracket can be adjusted to adapt to the receiving form of the supporting drill rod 6.

[0042] The vertical truss system 4 of the ship's hull anchoring steel wire rope is composed of φ100×4mm column steel pipes and φ60×3mm truss rod steel pipes. The bottom of the column steel pipe is welded to the ship deck, and diagonal braces are set on both sides for position limiting. An end anchoring system is formed for anchoring the diagonal steel strand 5.

[0043] A construction method of a land-to-sea directional drilling deep-sea drill pipe landing receiving adjustable bracket device, the steps of which are:

[0044] S1: Numerical curve analysis of the seabed configuration of drill pipes

[0045] Combined with the water depth in the deepwater area and the drill pipe exit angle, the combined effects of deadweight, buoyancy, water load, ocean current force, etc. are comprehensively considered to conduct a numerical curve analysis of the position from the drill pipe excavation point to the receiving ship area. The maximum span of the drill pipe in water is determined based on the ultimate stress and deformation control standard of the drill pipe material, and then the total length of the bracket support arm is determined.

[0046] S2: Welding assembly bracket and column anchor truss structure

[0047] On the ship platform, the column anchor truss is welded and the bracket structure is assembled. The bracket port is welded with the connecting ear plate, and the upper interval (s<2m) is welded to set the two sides of the bottom bracket device to open the oblique limit rod. The lifting ears are welded at 0.5L and 0.75L of the bracket to be inclined by the subsequent wire rope buckle.

[0048] S3: Mounting bracket

[0049] The bracket is lowered and installed with the assistance of a crane. The bracket port is hinged and rotatable through the bracket ear plate, the ship ear plate and the cylindrical pin. One end of the 2 rows and 2 groups of inclined steel wire ropes are connected to the top of the ship deck column and the other end is connected to the L / 2 and 3 / 4L span points of the bracket. The steel strand cable inclined support point is used to effectively control the deformation and stability of the large cantilever bracket structure itself.

[0050] S4: Bracket fine adjustment

[0051] Further accurately lower and raise the steel strands, and adjust the angle of the bracket to adapt to the receiving shape of the supporting drill pipe.

[0052] S5: Drill pipe unearthed and connected:

[0053] Observe the directional drilling control system of the drill pipe to ensure that the drill pipe excavation angle is controlled at 8°±2°. After the drill bit is excavated from the seabed near the excavation point, an air compressor with a displacement of 30 cubic meters / minute is used to inject air into the drill pipe to blow away the seabed mud. After the diver finds the drill bit along the bubbles and determines the excavation location, marks and collects the coordinates, the drill pipe is towed to the bracket, guided and towed to the ship deck through the bracket bottom support device, and finally connected to the receiving drilling rig on the ship.

Claims

1. A land-to-sea directional drilling deep-sea drill pipe landing receiving adjustable bracket device, characterized in that: It includes a steel tube truss large boom bracket structure, an articulated device connected to the hull with an adjustable angle, a bottom support device on the bracket, a steel wire rope inclined system for controlling longitudinal deformation, and a vertical truss system for anchoring steel wire ropes to the hull. The steel tube truss cantilever arm bracket structure is composed of an upper chord rod, a lower chord rod and an intermediate truss rod. The steel tube truss cantilever arm bracket is provided with an arc system with a high middle part and low ends. The bottom support device is welded on the large boom bracket structure with open oblique limit rods on both sides, and a horizontal bar with adjustable elevation is placed on it, on which a "C"-shaped rubber pad is placed to ensure adaptive contact of the drill rod on the bracket and reduce contact friction; The angle-adjustable hinge device connected to the hull is formed by inserting cylindrical pins and washers through the middle opening to form a rotatable hinge device; The steel wire rope inclined pulling system is composed of 4 groups of steel strands, of which 2 groups are inclined in 2 rows and are inclined on the upper chord of the bracket, and the horizontal position is controlled at the L / 2 and 3 / 4L span points of the bracket; through the inclined pulling fulcrum of the steel strand, the deformation and stability of the large boom bracket structure itself are effectively controlled, and at the same time, the angle of the bracket can be adjusted by lowering and lifting the steel strand to adapt to the receiving form of the supporting drill pipe; The vertical truss system of the ship hull anchoring wire rope is composed of column steel pipes and truss rod steel pipes; the bottom of the column steel pipe is welded to the ship deck, and diagonal braces are set on both sides for limiting, forming an end anchoring system for anchoring the inclined steel strands.

2. The adjustable bracket device for receiving deep-sea drill pipe for land-to-sea directional drilling according to claim 1 is characterized in that: The upper chord is made of φ100×4mm steel pipe, and the truss rod is made of φ60×3mm steel pipe.

3. The adjustable bracket device for landing and receiving deep-sea drill pipes for land-to-sea directional drilling according to claim 1 is characterized in that: The material of the ship ear plate and the bracket ear plate is Q345, with a thickness t of 20 to 36 mm. The width-to-thickness ratio of the ear plates on both sides is less than or equal to 4, and they are fully welded to the hull and the bracket at both ends. The diameter D of the solid cylindrical pin is 8 to 12 cm.

4. The adjustable bracket device for receiving deep-sea drill pipe for land-to-sea directional drilling according to claim 1 is characterized in that: Each group of steel strands uses 8 to 12 parallel φ15.2 steel strands.

5. The adjustable bracket device for landing and receiving deep-sea drill pipes for land-to-sea directional drilling according to claim 1 is characterized in that: The column steel pipe is φ100×4mm steel pipe, and the truss rod is φ60×3mm steel pipe.

6. A construction method using the land-to-sea directional drilling deep-sea drill pipe landing receiving adjustable bracket device according to any one of claims 1-5, characterized in that: The steps are: S1: Numerical curve analysis of the seabed configuration of drill pipes Combined with the water depth in the deep water area and the water exit angle of the drill pipe, the combined effects of deadweight, buoyancy, water-filled load, ocean current force, etc. are comprehensively considered to conduct numerical curve analysis of the position from the drill pipe excavation point to the receiving ship area. Based on the ultimate stress and deformation control standard of the drill pipe material, the maximum span of the drill pipe in water is determined, and then the total length of the bracket support arm is determined; S2: Welding assembly bracket and column anchor truss structure Weld the column anchor truss and assemble the bracket structure on the ship platform, weld the connecting ear plate at the bracket port, weld the upper interval s<2m to set the two sides of the bottom bracket device to open the oblique limit rods, weld the lifting ears at 0.5L and 0.75L of the bracket to be inclined by the subsequent wire rope buckle cable, L is the total length of the bracket; S3: Mounting bracket The bracket is lowered and installed with the assistance of a crane. The bracket port is rotatably hinged through the bracket ear plate, the ship ear plate and the cylindrical pin shaft. One end of the 2 rows and 2 groups of inclined steel wire ropes are connected to the top of the ship deck column and the other end is connected to the L / 2 and 3 / 4L span points of the bracket. The steel strand cable is used to pull the supporting point to effectively control the deformation and stability of the large boom bracket structure itself. S4: Bracket fine adjustment Further accurately lower and raise the strands, and adjust the angle of the bracket to adapt to the receiving shape of the supporting drill pipe; S5: Drill pipe unearthed and connected Observe the directional drilling control system of the drill pipe to ensure that the drill pipe excavation angle is controlled at 8°±2°; after the drill bit is excavated from the seabed near the excavation point, use an air compressor with a displacement of 30 cubic meters / minute to inject air from the drill pipe to blow away the seabed mud. After the diver finds the drill bit along the bubbles and determines the excavation position, marks and collects the coordinates, the drill pipe is towed to the bracket, guided and towed to the ship deck through the bracket bottom support device, and finally connected to the receiving drilling rig on the ship.

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