Limiting device for horizontal directional drilling of offshore guide hole and mounting method

Abstract

The invention relates to the field of offshore horizontal directional drilling engineering, in particular to a horizontal directional drilling offshore guide hole limiting device and a mounting method.The horizontal directional drilling offshore guide hole limiting device comprises a guide hole sleeve and a limiting supporting pile, the limiting supporting pile at least comprises an inverted-U-shaped pile cap, and the two ends of the pile cap are fixedly connected with pile legs; a cross arm beam is arranged between the two pile legs in a sliding mode, a limiting ring is rotationally arranged at the center of the cross arm beam and used for bearing a guide hole sleeve, adjusting chains are symmetrically and movably connected between the pile cap and the cross arm beam, and the height position of the cross arm beam is adjusted by adjusting the length of the adjusting chains. Limiting supporting piles are driven into design point positions, cross arm beams are hung through the supporting piles to bear guide hole sleeves, the guide hole sleeves provide penetration guide for a drill bit and provide radial constraint in water for a drill rod, and the technical problems that during offshore horizontal directional drilling construction, the drill bit accurately reaches a seabed penetration point, and the drill rod is stable in water are solved.

Description

Technical Field

[0001] The present invention relates to the field of offshore horizontal directional drilling engineering, and particularly relates to a horizontal directional drilling offshore guide hole limiting device and an installation method thereof. Background Art

[0002] When the horizontal directional drilling guide hole construction cannot be implemented on land, the drilling rig needs to be installed on the ship deck for offshore guide hole construction. Before the drill bit enters the soil, it is greatly affected by the water flow. If the traditional drill bit direct positioning method is used, it is difficult for the drill bit to accurately position to the entry point, resulting in deviation of the construction accuracy. At the same time, for offshore operations, if the drill pipe is directly suspended in the water for drilling, the drill pipe lacks radial restraint, and the drill pipe may become unstable under the action of the water flow, leading to construction accidents.

[0003] Chinese Patent "A Guide Drill Pipe of a Horizontal Directional Drilling Rig and Its Construction Method" with the publication number CN112240168B. For the guide drill pipe of the horizontal directional drilling rig and its construction method, firstly, an external sewage suction pump can be used to suck drilling fluid through the drill bit and the drill pipe, reduce the concentration of the drilling fluid, reduce the number of soil block particles, and thus facilitate the installation of the pipeline. Moreover, the reaming work can be completed without replacing the drill bit, with simple operation and reduced labor intensity of the staff.

[0004] During offshore drilling, the drill bit is difficult to accurately position to the entry point under the impact of complex water flows, and the drill pipe is suspended without radial restraint and is prone to unstable swing, resulting in large construction deviations and high accident risks. Summary of the Invention

[0005] The main purpose of the present invention is to provide a horizontal directional drilling offshore guide hole limiting device and an installation method thereof to solve the problems raised in the related art.

[0006] To achieve the above object, according to one aspect of the present invention, a horizontal directional drilling offshore guide hole limiting device is provided, which includes a guide hole casing and a limiting support pile. The limiting support pile at least includes a pile cap in an inverted U shape. Both ends of the pile cap are fixedly connected with pile legs. A cross beam is slidably arranged between the two pile legs. A limiting ring is rotatably arranged at the center of the cross beam. The limiting ring is used to support the guide hole casing. And adjustment chains are symmetrically movably connected between the pile cap and the cross beam to adjust the height position of the cross beam by adjusting the length of the adjustment chains.

[0007] Further, the guide hole casing is welded by a plurality of casing segments, and one end of the first section of the casing inserted into the seabed is in a conical structure.

[0008] Further, both ends of the cross beam are fixedly connected with sliders. The sliders are in a T shape. Chutes are opened on the opposite sides of the two pile legs. The sliders are slidably installed in the chutes.

[0009] Further, a spring is fixedly arranged in the sliding groove. One end of the spring is fixedly connected to the bottom wall of the sliding groove, and the other end is fixedly connected to the bottom wall of the slider.

[0010] Further, connection hooks are fixedly connected to the bottoms of both ends of the cross arm beam, and weight increasing blocks are hung on the connection hooks.

[0011] Further, connection buckles are fixedly connected to the tops of both ends of the cross arm beam. Snap rings are fixedly connected to both ends of the adjustment chain. One end of the adjustment chain is fixedly connected to the connection buckle through the snap ring. The other end of the adjustment chain is wound around the pile cap and fixedly connected to the pile cap through the snap ring.

[0012] Further, a plurality of rolling balls are rotatably arranged in an annular array on the inner wall of the limiting ring, and connection shafts are symmetrically and fixedly connected to the outer wall of the limiting ring.

[0013] Further, fixing plates are symmetrically and fixedly arranged on the cross arm beam. The two connection shafts are respectively rotatably installed in the two fixing plates, and screw holes concentric with the connection shafts are formed in the fixing plates. Screws are threadedly installed in the screw holes.

[0014] On the other hand, the present invention provides a method for installing a horizontal directional drilling offshore guide hole, which is used for the horizontal directional drilling offshore guide hole limiting device described in any one of the above, and includes the following steps:

[0015] S1. Complete the processing and prefabrication work of the guide hole casing, the limiting support pile, the cross arm beam and the adjustment chain on land;

[0016] S2. According to the driving depth of the pile, use a pile driving hammer to drive the pile legs of the limiting support pile into the seabed in the construction area;

[0017] S3. Adjust the lengths of the adjustment chains on each limiting support pile, and respectively connect the two ends of the adjusted adjustment chains to the cross arm beam and the pile cap through snap rings, so that each cross arm beam is on the same horizontal plane near the water surface;

[0018] S4. The drilling rig ship anchors and positions near the limiting support pile, and adjusts the ship position so that the drill at the stern of the ship is directly opposite to the limiting support pile;

[0019] S5. Install the guide hole casing by means of segmented welding. Insert a drill pipe into the first section of the casing, connect the drill pipe to the first section of the casing, and use the drilling rig to push the drill pipe to drive the first section of the casing to move towards the direction of the limiting support pile and pass through the limiting ring;

[0020] S6. Weld the first section and the second section of the casing on the drilling rig. After welding is completed, continue to insert the drill pipe into the second section of the casing, and continue to use the drilling rig to push the drill pipe to drive the second section of the casing to move towards the direction of the limiting support pile and pass through the limiting ring;

[0021] S7. Repeat this process until all the sections of the guide hole sleeve are welded and installed. At this time, the guide hole sleeve is supported by the crossbeam and is in a horizontal position.

[0022] S8. Adjust the length of each adjustment chain one by one from the far ship end to the near ship end according to the design, adjust the inclination angle of the limit ring synchronously, and hang a weight block of appropriate weight on the connecting hook to make the guide hole casing present the posture of a catenary in the water, with the far ship end falling on the seabed entry point and the near ship end fixed on the deck of the drilling rig ship;

[0023] S9, the diver goes into the water to release the first section of drill pipe from the first section of casing, and uses the drilling rig to pull back all the drill pipes inserted into the casing of the guide hole;

[0024] S10, locking each adjustment chain to complete the installation of the horizontal directional drilling offshore guide hole limit device.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In this offshore guide hole limit device and installation method for horizontal directional drilling, by driving limit support piles at the designed points, using the support piles to suspend crossbeams to support the guide hole casing, the guide hole casing provides soil guidance for the drill bit and radial constraints for the drill rod in the water, thereby solving the technical problems of the drill bit accurately reaching the seabed entry point and the stability of the drill rod in the water during offshore horizontal directional drilling construction.

[0027] 2. In this horizontal directional drilling offshore guide hole limit device and installation method, the limit ring is symmetrically rotated on the cross beam, and the inclination angle can be flexibly adjusted to adapt to different seabed slopes and drilling direction requirements, ensuring that the guide hole casing always maintains a straight line or a designed posture, and the balls in the circular array on the inner wall of the limit ring convert sliding friction into rolling friction, significantly reducing the casing advancement resistance, improving construction efficiency, while reducing equipment wear and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the guide hole limiting device in the preferred embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the connection structure of the limit support piles in the preferred embodiment of the present invention;

[0030] Figure 3 This is a construction layout diagram of drilling guide holes in a preferred embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the overall structure of the position-limiting support pile in a preferred embodiment of the present invention;

[0032] Figure 5Cross-sectional view of the limiting support pile in the preferred embodiment of the present invention;

[0033] Figure 6 In the preferred embodiment of the present invention Figure 5 Schematic enlarged view of the structure at position A;

[0034] Figure 7 In the preferred embodiment of the present invention Figure 5 Schematic enlarged view of the structure at position B.

[0035] Reference numerals:

[0036] 1. Guide hole casing; 2. Limiting support pile; 3. Adjusting chain;

[0037] 4. Cross beam; 41. Fixed plate; 411. Screw; 42. Connecting buckle; 43. Connecting hook; 44. Weight-increasing block; 45. Slide block;

[0038] 5. Pile leg; 51. Chute; 52. Spring;

[0039] 6. Pile cap; 7. Limiting ring; 71. Ball; 72. Connecting shaft. Detailed implementation manners

[0040] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0041] Embodiment 1:

[0042] This embodiment provides a horizontal directional drilling offshore guide hole limiting device, including a guide hole casing 1 and a limiting support pile 2. The limiting support pile 2 at least includes a pile cap 6 in an inverted U shape. Both ends of the pile cap 6 are fixedly connected with pile legs 5. A cross beam 4 is slidably arranged between the two pile legs 5. A limiting ring 7 is rotatably arranged at the center of the cross beam 4. The limiting ring 7 is used to support the guide hole casing 1. And adjusting chains 3 are symmetrically and movably connected between the pile cap 6 and the cross beam 4. The height position of the cross beam 4 is adjusted by adjusting the length of the adjusting chains 3.

[0043] As Figure 1 and Figure 3As shown, the guide hole casing 1 is welded by several casing sections. Due to the complex offshore construction environment, the overall length of the casing not only faces many difficulties during transportation, such as inconvenient loading and unloading, and easy to be damaged by natural factors such as waves, but also difficult to operate accurately during on-site installation. The segmented structure cleverly solves these problems. Construction personnel can transport the casing sections to the construction sea area one by one according to actual construction needs, and weld and assemble them in an orderly manner on the drilling rig ship; one end of the guide hole casing 1 is inserted into the seabed entry point, and the other end is fixed to the deck of the drilling rig ship. It is the channel before the drill bit enters the soil, which is used to constrain the drill bit to accurately reach the entry point, providing a relatively closed and stable propulsion environment for the drill bit, effectively isolating the drill bit from the surrounding complex geological environment (such as seawater, soil layers of different hardness, rocks, etc.), and avoiding the drill bit from being disturbed and hindered by external factors during the propulsion process, and the first section of the casing inserted into the seabed is a conical structure.

[0044] like Figure 1 and Figure 3 As shown, the limit support piles 2 are neatly arranged and fixed on the seabed between the drilling rig and the burial point, and are the pile foundation of the offshore guide hole limit device.

[0045] like Figure 4 , Figure 5 and Figure 6 As shown, both ends of the cross arm beam 4 are fixedly connected with sliders 45, and the sliders 45 are T-shaped. The two legs 5 are provided with slide grooves 51 on opposite sides. The sliders 45 are slidably installed in the slide grooves 51, and the slide grooves 51 are also T-shaped. Therefore, both ends of the cross arm beam 4 are strictly restricted in the slide grooves 51 and can only slide up and down in the vertical direction, but cannot be displaced in the horizontal direction or detached from the slide grooves 51, thereby realizing precise guidance and reliable limitation of the cross arm beam 4.

[0046] like Figure 5 and Figure 6 As shown, a spring 52 is fixedly arranged in the slide groove 51, one end of the spring 52 is fixedly connected to the bottom wall of the slide groove 51, and the other end is fixedly connected to the bottom wall of the slider 45; because the cross arm beam 4 needs to be adjusted below the water surface, the cross arm beam 4 may slide upward along the slide groove 51 due to its own buoyancy, causing the position of the guide hole sleeve 1 to change, affecting the construction accuracy, and the provision of the spring 52 can preliminarily stop the cross arm beam 4 from floating up, and exert a downward force on the cross arm beam 4 to prevent it from floating up.

[0047] like Figure 6As shown, at the bottom ends of the cross arm beam 4, there are fixedly connected connection hooks 43, which are designed in a J shape. A weight increasing block 44 is hung on the connection hook 43. According to the depth of the cross arm beam 4 below the horizontal plane, a weight increasing block 44 with an appropriate weight is hung on the connection hook 43 to prevent the cross arm beam 4 from floating up when the elastic force of the spring 52 is less than the buoyancy of the cross arm beam 4, which may affect its support for the guide hole casing 1.

[0048] As Figure 4 , Figure 5 and Figure 6 shown, at the top ends of the cross arm beam 4, there are fixedly connected connection buckles 42. At both ends of the adjustment chain 3, there are fixedly connected snap rings. One end of the adjustment chain 3 is fixedly connected to the connection buckle 42 through a snap ring, and the other end of the adjustment chain 3 is wound around the pile cap 6 and fixedly connected to the pile cap 6 through a snap ring; the adjustment precision of the adjustment chain 3 enables construction workers to flexibly and accurately adjust the height of the cross arm beam 4 according to the actual construction requirements, ensuring that the guide hole casing 1 is always in the correct position.

[0049] As Figure 2 shown, and both the limit support pile 2 and the cross arm beam 4 are of hollow structures. By removing the internal solid materials, on the premise of ensuring that the structural strength meets the complex marine working conditions (such as wind and wave impacts, drill bit reaction forces), the self-weights of the limit support pile 2 and the cross arm beam 4 are significantly reduced, and small holes are opened at appropriate positions for seawater to penetrate into the limit support pile 2 and the cross arm beam 4, increasing their stability in water.

[0050] As Figure 5 and Figure 7 shown, a number of rolling balls 71 are rotatably arranged in a circular array on the inner wall of the limit ring 7. The guide hole casing 1 needs to pass through the limit ring 7 and contact the rolling balls 71. As the guide hole casing 1 penetrates deeper, the rolling balls 71 rotate accordingly, effectively reducing the friction force for the forward movement of the guide hole casing 1. At the same time, it makes its movement smoother; symmetrically fixedly connected to the outer wall of the limit ring 7 are connection shafts 72.

[0051] As Figure 5 and Figure 7 shown, symmetrically fixedly arranged on the cross arm beam 4 are fixing plates 41. The two connection shafts 72 are respectively rotatably installed in the two fixing plates 41. Therefore, the inclination angle of the limit ring 7 can be adjusted according to the depth of the cross arm beam 4 below the horizontal plane, enabling the guide hole casing 1 to pass through each limit ring 7 in a straight line; and a screw hole concentric with the connection shaft 72 is opened in the fixing plate 41, and a screw 411 is threadedly installed in the screw hole. After the inclination angle of the limit ring 7 is fixed, the screw 411 is threadedly installed in the screw hole and tightened, and the screws 411 on both sides press against the connection shaft 72 to fix the limit ring 7.

[0052] Embodiment 2:

[0053] The difference between Embodiment 2 and Embodiment 1 of the present invention lies in that this embodiment introduces an installation method used for a horizontal directional drilling offshore guide hole limiting device, including the following steps:

[0054] S1. Complete the processing and prefabrication work of the guide hole casing 1, the limiting support pile 2, the crossbeam 4, and the adjustment chain 3 on land;

[0055] S2. According to the driving depth of the pile, use a pile hammer to drive the pile leg 5 of the limiting support pile 2 into the seabed in the construction area;

[0056] S3. Adjust the length of the adjustment chain 3 on each limiting support pile 2, and respectively connect the two ends of the adjusted adjustment chain 3 to the crossbeam 4 and the pile cap 6 through snap rings, so that each crossbeam 4 is located on the same horizontal plane near the water surface;

[0057] S4. The drilling rig ship anchors and positions near the limiting support pile 2. The anchoring point should be far away from the construction area and the offshore shipping lane to prevent the anchor chain from getting entangled or the ship from colliding. Adjust the ship position so that the drill at the stern of the ship is directly facing the limiting support pile 2;

[0058] S5. Install the guide hole casing 1 by means of segmented welding. Insert a drill pipe into the first section of the casing, connect the drill pipe to the first section of the casing, and use the drilling rig to push the drill pipe to drive the first section of the casing to move towards the direction where the limiting support pile 2 is located and pass through the limiting ring 7;

[0059] S6. Weld the first section and the second section of the casing on the drilling rig. After welding is completed, continue to insert the drill pipe into the second section of the casing, and continue to use the drilling rig to push the drill pipe to drive the second section of the casing to move towards the direction where the limiting support pile 2 is located and pass through the limiting ring 7;

[0060] S7. And so on, until the installation of the guide hole casing 1 is completed by segmented welding. At this time, the guide hole casing 1 is supported by the crossbeam 4, and the guide hole casing 1 is in a horizontal posture.

[0061] S8. Adjust the length of each adjustment chain 3 one by one from the far end of the ship to the near end of the ship according to the design, synchronously adjust the inclination angle of the limiting ring 7, and hang appropriate weight increment blocks 44 on the connecting hook 43 to make the guide hole casing 1 in the shape of a catenary in water, with its far end falling on the seabed entry point and its near end fixed on the deck of the drilling rig ship;

[0062] S9. The diver goes into the water to release the first drill pipe from the first section of the casing, and relies on the reverse pulling of the drilling rig to retract all the drill pipes inserted into the guide hole casing 1;

[0063] S10. Lock each adjustment chain 3 to complete the installation of the horizontal directional drilling offshore guide hole limiting device.

[0064] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A horizontal directional drilling offshore guide hole limiting device, comprising a guide hole casing (1) and a limiting support pile (2), characterized in that, The limiting support pile (2) at least includes a pile cap (6) in an inverted U shape. Both ends of the pile cap (6) are fixedly connected with pile legs (5). A cross beam (4) is slidably arranged between the two pile legs (5). A limiting ring (7) is rotatably arranged at the center of the cross beam (4). The limiting ring (7) is used to support the guide hole casing (1). And adjustment chains (3) are symmetrically and movably connected between the pile cap (6) and the cross beam (4). The height position of the cross beam (4) is adjusted by adjusting the length of the adjustment chains (3).

2. The horizontal directional drilling offshore pilot hole limiting device according to claim 1, wherein The guide hole casing (1) is formed by welding a plurality of casing segments. And one end of the first section of the casing inserted into the seabed is in a conical structure.

3. The horizontal directional drilling offshore pilot hole limiting device according to claim 1, wherein Both ends of the cross beam (4) are fixedly connected with sliders (45). The sliders (45) are in a T shape. Chutes (51) are formed on one side of the two pile legs (5) facing each other. The sliders (45) are slidably installed in the chutes (51).

4. The horizontal directional drilling offshore pilot hole limiting device according to claim 3, wherein Springs (52) are fixedly arranged in the chutes (51). One end of each spring (52) is fixedly connected with the bottom wall of the chute (51), and the other end is fixedly connected with the bottom wall of the slider (45).

5. The horizontal directional drill offshore guide hole limiting device according to claim 1, characterized in that, Connection hooks (43) are fixedly connected to the bottoms of both ends of the cross beam (4). Weight increasing blocks (44) are hung on the connection hooks (43).

6. The horizontal directional drilling offshore pilot hole limiting device according to claim 1, wherein Connection buckles (42) are fixedly connected to the tops of both ends of the cross beam (4). Both ends of the adjustment chain (3) are fixedly connected with snap rings. One end of the adjustment chain (3) is fixedly connected with the connection buckle (42) through a snap ring. The other end of the adjustment chain (3) is wound around the pile cap (6) and fixedly connected with the pile cap (6) through a snap ring.

7. The horizontal directional drilling offshore guide hole limiting device according to claim 1, characterized in that, A plurality of balls (71) are rotatably arranged in an annular array on the inner wall of the limiting ring (7). Connection shafts (72) are symmetrically and fixedly connected to the outer wall of the limiting ring (7).

8. The horizontal directional drilling offshore guide hole limiting device according to claim 7, wherein, Fixed plates (41) are symmetrically and fixedly arranged on the cross beam (4). The two connection shafts (72) are respectively rotatably installed in the two fixed plates (41). And screw holes concentric with the connection shafts (72) are formed in the fixed plates (41). Screws (411) are threadedly installed in the screw holes.

9. A method for installing a horizontal directional drilling offshore pilot hole, which is used for the horizontal directional drilling offshore pilot hole limiting device described in any one of claims 1-8, characterized in that, It includes the following steps: S1. Complete the processing and prefabrication work of the guide hole casing (1), the limiting support pile (2), the cross beam (4) and the adjustment chain (3) on land; S2. According to the driving depth of the pile, use a pile hammer to drive the pile legs (5) of the limiting support pile (2) into the seabed in the construction area; S3. Adjust the lengths of the adjustment chains (3) on each limiting support pile (2), and respectively connect both ends of the adjustment chains (3) with the cross beam (4) and the pile cap (6) through snap rings, so that each cross beam (4) is on the same horizontal plane near the water surface; S4. The drilling rig ship anchors in place near the limiting support pile (2), and adjusts the ship position so that the drill at the stern of the ship is directly facing the limiting support pile (2); S5. The guide hole casing (1) is installed by means of segmented welding. Insert a drill pipe into the first section of the casing, connect the drill pipe with the first section of the casing, use the drill rig to push the drill pipe to drive the first section of the casing to move towards the direction where the limiting support pile (2) is located, and pass through the limiting ring (7); S6. Weld the first and second sections of the casing on the drilling rig. After welding is completed, continue to extend the drill pipe into the second section of the casing, and continue to use the drilling rig to push the drill pipe to drive the second section of the casing to move in the direction of the limit support pile (2) and pass through the limit ring (7). S7. And so on until all the segmented welded installations of the guide hole casing (1) are completed. At this time, the guide hole casing (1) is supported by the crossbeam (4), and the guide hole casing (1) is in a horizontal posture. S8. Adjust the lengths of the respective adjustment chains (3) one by one from the far ship end to the near ship end according to the design, synchronously adjust the inclination angle of the limit ring (7), and hang a weight-increasing block (44) of appropriate weight on the connecting hook (43) to make the guide hole casing (1) in the posture of a catenary in water, with its far ship end landing at the seabed entry point and its near ship end fixed on the drilling rig deck. S9. The diver goes into the water to release the first section of the drill pipe from the first section of the casing, and relies on the reverse pulling of the drilling rig to retract all the drill pipes extending into the guide hole casing (1). S10. Lock the respective adjustment chains (3) to complete the installation of the horizontal directional drilling offshore guide hole limiting device.

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