Offshore wind power survey guide sleeve multistage deviation correction system

Abstract

This utility model provides a multi-stage correction system for offshore wind power exploration guide casings. The guide casing includes a connecting casing section, a correction casing, a drill collar, and a cutting edge casing. Adjacent connecting casing sections are connected by correction casings. The lower end of the lowest connecting casing section is sequentially connected to the drill collar and the cutting edge casing. M winches are evenly distributed circumferentially at the upper end of the guide casing. M correction latches are evenly distributed circumferentially on the drill collar. Each correction latch is connected to the corresponding winch via a steel wire rope. The upper end of the guide casing has multiple casing correction winch groups, the same number as the correction casings in the guide casing. Each casing correction winch group includes N winches evenly distributed circumferentially at the upper end of the guide casing. N correction latches are evenly distributed circumferentially on the correction casing. Each correction latch is connected to the corresponding winch via a steel wire rope. The multi-stage correction mechanism of this invention ensures that each section of the guide sleeve is in a vertical position.

Description

Technical Field

[0001] This utility model relates to the field of guide sleeve correction technology, specifically to a multi-stage correction system for guide sleeves used in offshore wind power exploration. Background Technology

[0002] In offshore wind power exploration, the pilot casing is used to guide the drill pipe of the drilling equipment to follow the drilling and form the hole. Its verticality directly affects the verticality of the drill pipe hole. After installation, only the top of the pilot casing is stable on the drilling system, while the bottom of the casing is inserted to a certain depth in a high-strength, stable soil layer by its own weight to ensure the stability of the casing. However, due to factors such as ocean currents, waves, and uneven seabed geology, the casing in the seawater section and the soft soil layer section is prone to displacement. When the casing is severely bent by the impact of ocean currents, it can cause the drill pipe to bend, the borehole to collapse, or even the casing to break. In addition, the pilot casing is a typical long and slender rod with poor self-stability and no surrounding constraints, making it difficult for the casing to maintain a vertical state when entering the formation from the predetermined hole position.

[0003] Existing guide sleeve correction technology lacks real-time monitoring and dynamic adjustment mechanisms, making it difficult to cope with complex sea conditions. Furthermore, it lacks safety structures, and when the deviation exceeds the limit, it can easily lead to problems such as sleeve detachment and hole loss.

[0004] In summary, there is an urgent need for a multi-stage correction system for offshore wind power exploration guide sleeves to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-stage correction system for offshore wind power exploration guide sleeves, aiming to solve the problems of existing guide sleeve correction systems lacking real-time monitoring and unable to cope with complex sea conditions, and lacking a safety structure that makes the sleeve prone to detachment and hole breakage. The specific technical solution is as follows:

[0006] A multi-stage correction system for a guide casing in offshore wind power exploration, wherein the guide casing includes a connecting casing section, a correction casing, a drill collar, and a cutting edge casing. Adjacent connecting casing sections are connected by the correction casing, and the lower end of the lowest connecting casing section is sequentially connected to the drill collar and the cutting edge casing.

[0007] M winches are evenly distributed circumferentially at the upper end of the guide sleeve, and M correction latches are evenly distributed circumferentially on the body of the drill collar. Each correction latch is connected to the corresponding winch via a wire rope.

[0008] The upper end of the guide sleeve is provided with multiple sleeve correction winch sets, which are the same as the number of correction sleeves in the guide sleeve; the sleeve correction winch set includes N winches II evenly distributed along the circumference of the upper end of the guide sleeve, and N correction locks II evenly distributed along the circumference of the tube body of the correction sleeve, each correction lock II being connected to the corresponding winch II by a steel wire rope II.

[0009] Where M and N are both natural numbers greater than or equal to 3.

[0010] Preferably, the connecting sleeve section includes a plurality of connecting sleeves connected in sequence, and adjacent connecting sleeves, connecting sleeves and correction sleeves, connecting sleeves and drill collars, and drill collars and cutting edge sleeves are all connected by internal thread interfaces and external thread interfaces.

[0011] Preferably, safety latches are provided at both ends of the connecting sleeve, both ends of the correcting sleeve, both ends of the drill collar, and the upper end of the cutting edge sleeve.

[0012] After the internal thread interface and the external thread interface are connected, the safety lock near the internal thread interface and the safety lock near the external thread interface are connected by a safety rope.

[0013] Preferably, K safety latches are evenly distributed circumferentially at both ends of the connecting sleeve, both ends of the correction sleeve, both ends of the drill collar, and the upper end of the cutting edge sleeve, where K is a natural number greater than or equal to 2.

[0014] Preferably, each of the first correction latches on the drill collar is located at the same height, and each of the second correction latches on the correction sleeve is located at the same height.

[0015] Preferably, the correction sleeve is provided with a thickened protective sleeve, and the second correction lock is provided on the thickened protective sleeve.

[0016] Preferably, both the correction sleeve and the drill collar are equipped with tilt sensors, which are electrically connected to the controller. The controller can control the winding and unwinding of the wire rope by winches one and two.

[0017] Preferably, the tilt sensor on the correction sleeve and the second correction latch are located at the same height, and the tilt sensor on the drill collar and the first correction latch are located at the same height.

[0018] Preferably, both winch one and winch two are equipped with a tension sensor and a lower rope length meter. The tension sensor and the lower rope length meter are electrically connected to a controller, which can control winch one and winch two to raise and lower the wire rope.

[0019] Preferably, the drill collar has a streamlined structure that is large in the middle and narrow at both ends.

[0020] The application of the technical solution of this utility model has the following beneficial effects:

[0021] This utility model's correction system includes a drill collar and several correction sleeves, enabling multi-stage correction of the guide sleeve to ensure that each section of the guide sleeve remains vertical. It employs two methods to determine the sleeve's tilt state: a tilt sensor and a combination of a tension sensor and a lower rope length meter. This mutual verification allows for real-time monitoring of the guide sleeve's status. The redundant design of these two guide sleeve status monitoring methods ensures the system's operational stability in complex sea conditions.

[0022] This invention features a safety lock at the end of the pipe fitting. After the two pipe fittings are connected by threads, a safety rope is used to lock the safety lock. When the threaded connection comes loose, the safety rope can prevent the guide sleeve from breaking. Subsequently, the entire guide sleeve can be retrieved simply by controlling the winch to retrieve the wire rope, thus avoiding the problem of the sleeve falling out of the hole.

[0023] This invention features a thickened protective sleeve on the alignment sleeve, which locally thickens the alignment sleeve to prevent it from being damaged by the steel wire rope and ensures that the alignment sleeve can withstand greater steel wire rope tension to meet the alignment needs under complex sea conditions.

[0024] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the multi-stage correction system for the guide sleeve of this utility model;

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure of the sleeve with a central cutting edge;

[0028] Figure 3 yes Figure 1 A schematic diagram of the structure of the drill collar;

[0029] Figure 4 yes Figure 1 Schematic diagram of the structure of the center correction sleeve;

[0030] Figure 5 This is a schematic diagram of the connection between adjacent connecting sleeves;

[0031] Figure 6 This is a schematic diagram of the arrangement of the steel wire rope on the drill collar;

[0032] Among them, 1. Self-elevating exploration platform, 2. Seabed, 3. Winch 1, 3.1. Wire rope 1, 4. Winch 2, 4.1. Wire rope 2, 5. Moon pool opening, 6. Controller, 7. Connecting sleeve, 8. Correction sleeve, 8.1. Thickened casing, 8.2. Correction lock 2, 9. Drill collar, 9.1. Correction lock 1, 10. Cutting sleeve, 10.1. Cutting edge, 11. Safety lock, 12. Internal thread interface, 13. External thread interface, 14. Safety rope. Detailed Implementation

[0033] To facilitate understanding of this invention, a more comprehensive description is provided below, along with preferred embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] Example:

[0036] like Figures 1-6 As shown, a multi-stage correction system for offshore wind power exploration guide casing is provided. The guide casing includes a connecting casing section, a correction casing 8, a drill collar 9, and a cutting edge casing 10. Adjacent connecting casing sections are connected by the correction casing 8. The lower end of the lowest connecting casing section is connected to the drill collar 9 and the cutting edge casing 10 in sequence.

[0037] The upper end of the guide sleeve is provided with M winches 3 evenly distributed along the circumference, and the drill collar 9 is provided with M correction latches 9.1 evenly distributed along the circumference. Each correction latch 9.1 is connected to the corresponding winch 3 by a wire rope 3.1.

[0038] The upper end of the guide sleeve is provided with multiple sleeve correction winch sets, which are the same number as the correction sleeves 8 in the guide sleeve. The correction sleeves 8 and the sleeve correction winch sets are set one-to-one. The sleeve correction winch set includes N winches 2 4 evenly distributed around the upper end of the guide sleeve. N correction latches 2 8.2 are evenly distributed around the tube body of the correction sleeve 8. Each correction latch 2 8.2 is connected to the corresponding winch 2 4 through a steel wire rope 2 4.1.

[0039] Where M and N are both natural numbers greater than or equal to 3.

[0040] Specifically, the first winch 3 and the second winch 4 are both fixedly installed on the jacking exploration platform 1. The guide sleeve is gradually lowered from the center of the moon pool opening 5 on the jacking exploration platform 1 and inserted into the seabed 2. M first winches 3 are evenly distributed around the moon pool opening 5 (i.e., the guide sleeve) on the jacking exploration platform 1. Similarly, N second winches 4 in the sleeve correction winch group are also evenly distributed around the moon pool opening 5 (i.e., the guide sleeve) on the circumference. Each winch 3 is connected to the correction lock 9.1 on the drill collar 9 via a wire rope 3.1. By adjusting the amount of winding and unwinding of the pair of wire ropes 3.1 on each winch, the drill collar 9 can be adjusted to a vertical position. Similarly, each winch 4 is connected to the correction lock 8.2 on the correction sleeve 8 via a wire rope 4.1. By adjusting the amount of winding and unwinding of the wire rope 4.1 on each winch 4, the correction sleeve 8 can also be adjusted to a vertical position. In this embodiment, the drill collar mainly ensures the verticality of the bottom end of the guide sleeve entering the mud section, ensuring that the drill rod can form a vertical hole. The correction sleeve mainly ensures the verticality of the upper seawater section, ensuring that the drill rod can smoothly enter the hole. In this embodiment, the tilt state is adjusted at multiple positions on the guide sleeve, thereby achieving the purpose of keeping the entire guide sleeve in a vertical position.

[0041] Furthermore, the number of casing correction winch sets on the self-elevating exploration platform 1 can be redundantly set. The number of correction sleeves 8 actually added to the guide sleeve is then matched with the corresponding number of casing correction winch sets connected to the correction sleeves 8 in the guide sleeve.

[0042] like Figures 3-4 As shown, the first 9.1 of the drill collar 9 is located at the same height, and the second 8.2 of the correction sleeve 8 is located at the same height. That is, the first 9.1 and the second 8.2 of the correction sleeve are all coplanar. Those skilled in the art will understand that with this arrangement, the planes where the first 9.1 and the second 8.2 of the correction sleeve are located can be adjusted to a horizontal state by using a steel wire rope, thereby achieving the purpose of adjusting the drill collar 9 and the correction sleeve 8 to a vertical state.

[0043] like Figure 4 As shown, the correction sleeve 8 is provided with a thickened protective sleeve 8.1, and the correction locking buckle 2 8.2 is disposed on the thickened protective sleeve 8.1. The thickened protective sleeve 8.1 is used to locally thicken the correction sleeve 8 to prevent the correction sleeve 8 from being damaged by the pulling of the steel wire rope 2 4.1.

[0044] Furthermore, the connecting sleeve segment includes a plurality of connecting sleeves 7 connected in sequence. The number of connecting sleeves 7 in each connecting sleeve segment does not need to be equal, that is, the number of connecting sleeves in each connecting sleeve segment can be set according to the actual situation.

[0045] Furthermore, adjacent connecting sleeves 7, connecting sleeve 7 and correcting sleeve 8, connecting sleeve 7 and drill collar 9, and drill collar 9 and cutting edge sleeve 10 are all connected via internal thread interface 12 and external thread interface 13. In this embodiment, when two pipe fittings are connected, the upper end of the lower pipe fitting is provided with internal thread interface 12, and the lower end of the upper pipe fitting is provided with external thread interface 13, thereby realizing the sequential connection to form a guide sleeve. The guide sleeve can be supplemented by connecting sleeve 7 and correcting sleeve 8 to meet actual needs.

[0046] like Figures 2-5 As shown, safety latches 11 are provided at both ends of the connecting sleeve 7, both ends of the straightening sleeve 8, both ends of the drill collar 9, and the upper end of the cutting edge sleeve 10. After the internal thread interface 12 and the external thread interface 13 are connected, the safety latches 11 near the internal thread interface 12 and the safety latches 11 near the external thread interface 13 are connected by a safety rope 14. This prevents the sleeve from falling off and breaking due to the impact of currents or waves, thus preventing the sleeve from being unrecoverable. When the threads of the two pipes fall off, the guide sleeve will not break due to the presence of the safety rope. The entire guide sleeve can be recovered by using winch one and winch two to retrieve the wire rope.

[0047] Preferably, K safety latches 11 are evenly distributed circumferentially at both ends of the connecting sleeve 7, both ends of the straightening sleeve 8, both ends of the drill collar 9, and the upper end of the bladed sleeve 10, where K is a natural number greater than or equal to 2. By setting multiple safety latches 11, the connection between the pipe fittings can be made more secure to prevent it from falling off.

[0048] Furthermore, both the straightening sleeve 8 and the drill collar 9 are equipped with tilt sensors. These sensors measure the tilt of the straightening sleeve 8 and the drill collar 9, providing a reference for adjusting them to a vertical position. Preferably, the tilt sensor on the straightening sleeve 8 is at the same height as the second straightening latch, and the tilt sensor on the drill collar 9 is at the same height as the first straightening latch 9.1. This allows for direct measurement of whether the plane containing the first straightening latch 9.1 and the plane containing the second straightening latch 8.2 are horizontal, facilitating guidance for the winch 3 and winch 4 in adjusting the wire rope winding and unwinding.

[0049] Furthermore, the tilt sensor is electrically connected to the controller 6, which can control the winding and unwinding of the wire rope by winch one and winch two. According to the tilt angle and direction indicated by the tilt sensor, the corresponding winch one or winch two can be adjusted to achieve the vertical adjustment of the correction sleeve and drill collar.

[0050] Furthermore, in this embodiment, both winch 3 and winch 4 are equipped with a tension sensor and a lowering rope length meter. The tension on the wire rope and the lowering length of the wire rope can be obtained through the tension sensor and the lowering rope length meter. The tension sensor and the lowering rope length meter are both electrically connected to the controller 6.

[0051] The tilt of the guide sleeve can also be adjusted using a tension sensor and a lower rope length meter. For example... Figure 6 As shown, taking the adjustment of the drill collar's tilt state as an example, four correction latches 9.1 are evenly distributed along the circumference of the drill collar 9, meaning that the drill collar 9 is connected to four steel wire ropes 3.1, and the tilt state of the drill collar is adjusted by four winches 3. When the drill collar 9 is in a vertical state (i.e., when the plane of the correction latches 9.1 is horizontal), the two lowering lengths L1, L2, L3, L4 of the four steel wire ropes 3.1 that are on the same straight line should be equal, and the two tensions σ1, σ2, σ3, σ4 of the four steel wire ropes 3.1 that are on the same straight line should also be equal, or, the difference in lowering length between any two steel wire ropes 3.1 that are on the same straight line should be less than the threshold ΔL, and the difference in tension between any two steel wire ropes 3.1 that are on the same straight line should be less than the threshold Δσ.

[0052] Preferably, the tension on wire rope 3.1 and wire rope 4.1 should be within [0.55f]. pk 0.75f pk ], f pk This is the standard strength value for prestressed wire ropes to prevent different lengths of the wire ropes due to elastic deformation (i.e., although the wire ropes are lowered to the same length, one wire rope is stretched due to elastic deformation, causing the drill collar or correction sleeve to be in an inclined state), and also to prevent plastic deformation of the wire ropes.

[0053] In this embodiment, a combination of tilt sensor, tension sensor, and lower rope length meter is used to verify each other, ensuring the guide sleeve is in a vertical position. If the drill collar or correction sleeve is not in a vertical position, the corresponding wire rope can be adjusted according to the tilt angle and direction indicated by the tilt sensor. The traction of the wire rope will bring the plane where the correction lock 9.1 is located or the plane where the correction lock 8.2 is located to a horizontal position, thus achieving the purpose of adjusting the drill collar or correction sleeve to a vertical position. In addition, the tilt state of the drill collar or correction sleeve can also be determined by the lowering length and tension value of the wire rope, thereby achieving the purpose of adjusting the guide sleeve to a vertical position.

[0054] like Figure 3As shown, the drill collar has a streamlined structure that is large in the middle and narrow at both ends. That is, the diameter of the middle part of the drill collar 9 is larger than the diameter of both ends, which can effectively reduce the soil squeezing resistance and prevent the drill from getting stuck due to pressure difference. It can also prevent the guide sleeve from tilting due to soil resistance and has the function of stabilizing the drilling.

[0055] Preferably, in this embodiment, a pulley is provided on the self-elevating exploration platform 1, and the direction of the wire rope 3.1 and the wire rope 4.1 is changed by the pulley.

[0056] Preferably, the lower end of the bladed sleeve 10 is provided with a cutting edge 10.1, and the bladed sleeve 10 can cut the soil layer, so that the guide sleeve can be driven by its own weight to advance into the seabed 2.

[0057] In this embodiment, the multi-level correction system operates as follows:

[0058] S1: The drilling rig is in standby mode. The guide casing is lowered to the seabed 2 by winch 3 and winch 4, and inserted into the seabed to a certain depth by its own weight.

[0059] S2: After the guide sleeve can no longer be inserted into the seabed by its own weight, the winch 3 tightens the wire rope 3.1 to pull the drill collar 9. The tilt state of the drill collar is judged by the combination of the tilt sensor or the tension sensor and the lower rope length meter. The wire rope 3.1 of each winch 3 is tightened and loosened to adjust the drill collar to a vertical state.

[0060] S3: Correct each correction sleeve 8 sequentially from bottom to top. The correction of a single correction sleeve is as follows: tighten the steel wire rope 4.1 of the correction sleeve 8 by winch 2 4, determine the tilt state of the correction sleeve 8 by a combination of tilt sensor or tension sensor and lower rope length meter, and adjust the correction sleeve 8 to a vertical state by winding and unwinding the steel wire rope 4.1 of winch 2 4.

[0061] S4: Start the drilling rig and lower the drill rod. After completing one drilling cycle, winch one and winch two release the wire rope simultaneously. The guide sleeve is pushed forward by its own weight along the rod. Repeat S3 to correct the deviation until the guide sleeve stands on plastic or hard plastic cohesive soil or medium-dense or dense silty soil.

[0062] Preferably, in addition to adjusting the tilted guide sleeve to a vertical state, the multi-stage correction system in this embodiment can also restore the guide sleeve to a straight state by traction of a steel wire rope when the guide sleeve is bent due to ocean currents. The specific adjustment method is not described in detail in this embodiment.

[0063] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-stage deviation correction system for offshore wind farm surveying guide casing, characterized in that, The guide casing includes a connecting casing section, a correction casing (8), a drill collar (9), and a cutting edge casing (10). Adjacent connecting casing sections are connected by the correction casing (8). The lower end of the lowest connecting casing section is connected to the drill collar (9) and the cutting edge casing (10) in sequence. The upper end of the guide sleeve is provided with M winches (3) evenly distributed along the circumference, and the drill collar (9) is provided with M correction latches (9.1) evenly distributed along the circumference. Each correction latch (9.1) is connected to the corresponding winch (3) by a wire rope (3.1). The upper end of the guide sleeve is provided with multiple sleeve correction winch sets, which are the same number as the correction sleeves (8) in the guide sleeve; the sleeve correction winch set includes N winches (4) evenly distributed along the circumference of the upper end of the guide sleeve, and N correction latches (8.2) evenly distributed along the circumference of the tube body of the correction sleeve (8), and each correction latch (8.2) is connected to the corresponding winch (4) through a steel wire rope (4.1); Where M and N are both natural numbers greater than or equal to 3.

2. Offshore wind farm survey guide casing multi-stage deviation correction system according to claim 1, characterized in that, The connecting sleeve section includes several connecting sleeves (7) connected in sequence. Adjacent connecting sleeves (7), connecting sleeves (7) and correction sleeves (8), connecting sleeves (7) and drill collars (9), and drill collars (9) and cutting sleeves (10) are all connected through internal threaded interfaces (12) and external threaded interfaces (13).

3. Offshore wind farm survey guide casing multi-stage deviation correction system according to claim 2, characterized in that, Safety latches (11) are provided at both ends of the connecting sleeve (7), both ends of the correction sleeve (8), both ends of the drill collar (9), and the upper end of the cutting edge sleeve (10). After the internal thread interface (12) and the external thread interface (13) are connected, the safety lock (11) near the internal thread interface (12) and the safety lock (11) near the external thread interface (13) are connected by a safety rope (14).

4. Offshore wind farm survey guide casing multi-stage deviation correction system according to claim 3, characterized in that, Both ends of the connecting sleeve (7), both ends of the correction sleeve (8), both ends of the drill collar (9), and the upper end of the cutting edge sleeve (10) are all provided with K safety latches (11) evenly distributed in the circumferential direction, where K is a natural number greater than or equal to 2.

5. The offshore wind farm survey guide casing multi-stage correction system of claim 1, wherein, Each of the first correction latches (9.1) on the drill collar (9) is located at the same height position, and each of the second correction latches (8.2) on the correction sleeve (8) is located at the same height position.

6. Offshore wind farm survey guide casing multi-stage deviation correction system according to claim 5, characterized in that, The correction sleeve (8) is provided with a thickened protective sleeve (8.1), and the correction locking buckle two (8.2) is provided on the thickened protective sleeve (8.1).

7. The offshore wind farm survey guide casing multi-stage correction system of claim 5, wherein, Both the correction sleeve (8) and the drill collar (9) are equipped with tilt sensors. The tilt sensors are electrically connected to the controller (6). The controller can control the winch one (3) and winch two (4) to raise and lower the wire rope.

8. Offshore wind farm survey guide casing multi-stage deviation correction system according to claim 7, characterized in that, The tilt sensor on the correction sleeve (8) and the second correction latch (8.2) are set at the same height, and the tilt sensor on the drill collar (9) and the first correction latch (9.1) are set at the same height.

9. The offshore wind farm surveying guide casing multi-stage correction system according to claim 1, characterized in that, Both winch one (3) and winch two (4) are equipped with a tension sensor and a lower rope length meter. The tension sensor and the lower rope length meter are electrically connected to the controller (6). The controller (6) can control the winch one (3) and winch two (4) to wind up and release the wire rope.

10. The multi-stage correction system for offshore wind power exploration guide sleeves according to any one of claims 1-9, characterized in that, The drill collar (9) has a streamlined structure that is large in the middle and narrow at both ends.

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