Limiting structure for connection and disconnection of drilling platform and construction method of limiting structure

Abstract

The invention discloses a limiting structure for connection and disconnection of a drilling platform and a construction method thereof.The limiting structure for connection and disconnection of the drilling platform comprises a plurality of limiting towing wheels, limiting towing cables of the limiting towing wheels are connected with limiting rigging, a plurality of column legs are arranged on the drilling platform, the limiting rigging is connected to the column legs on the drilling platform, and the limiting towing cables of the limiting towing wheels are connected with the limiting rigging. The plurality of limiting tugs are all connected with the drilling platform; the length of the limiting towing cable is adjusted, and the drilling platform is limited in the horizontal direction so that the drilling platform can be connected to the seabed through an anchor chain; and the heading directions of the limiting tugs are adjusted, and the tightness state of connection between the anchor chain of the drilling platform and the seabed is changed, so that connection between the anchor chain in the moving direction of the limiting tugs and the drilling platform is released. According to the limiting structure for connection and disconnection of the drilling platform, the limiting rigging is connected with the drilling platform, the limiting rigging is high in durability and can be continuously stressed for a long time, interference between the limiting tug and a main workboat is avoided through the limiting tug, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore oil engineering, and particularly relates to a limiting structure for connecting and disconnecting a semi-submersible drilling platform and a construction method thereof. Background Art

[0002] The semi-submersible drilling platform is generally fixed in the ocean by means of multi-point mooring. Therefore, when the mooring connection or disconnection of the semi-submersible drilling platform is carried out, the drilling platform needs to be limited for a long time to control its in-place position to meet the requirements of mooring system installation / disconnection and other related operations.

[0003] The semi-submersible drilling platform has an unconventional ship type structure, and its limiting mode is quite different from that of a conventional FPSO; since the mooring system connection or disconnection operation takes a long time and the operation process cannot be interrupted, the drilling platform needs to be continuously limited for a long time. At the same time, due to the non-weathervane nature of the drilling platform, the layout of the limiting tugs needs to consider the position between the limiting tugs and the main construction vessel; affected by marine environmental factors, namely wind, waves, and currents, the displacement of the drilling platform will occur. Therefore, it is necessary to ensure that the resultant force of the limiting tugs can apply a towing force to the drilling platform at any angle.

[0004] Therefore, there is an urgent need to design a limiting structure for connecting and disconnecting a drilling platform to solve the above-mentioned problems. Summary of the Invention

[0005] In order to solve the technical problem that the displacement of the drilling platform will occur due to marine environmental factors mentioned in the background art, and therefore it is necessary to ensure that the resultant force of the limiting tugs can apply a towing force to the drilling platform at any angle, a limiting structure for connecting and disconnecting a drilling platform is provided to solve the problem of limiting the semi-submersible drilling platform during connection and disconnection.

[0006] To achieve the above object, the specific technical solution of the limiting structure for connecting and disconnecting a drilling platform of the present invention is as follows:

[0007] A limiting structure for connecting and disconnecting a drilling platform includes a plurality of limiting tugs. The limiting towing cables of the limiting tugs are connected to limiting rigging. A plurality of columns are provided on the drilling platform, and the limiting rigging is connected to the columns on the drilling platform so that all the limiting tugs are connected to the drilling platform; by adjusting the length of the limiting towing cables, the drilling platform is limited in the horizontal direction so that the drilling platform is connected to the seabed through an anchor chain; by adjusting the heading of the plurality of limiting tugs, the tightness state of the connection between the anchor chain of the drilling platform and the seabed is changed so that the anchor chain in the moving direction of the plurality of limiting tugs is disconnected from the connection with the drilling platform.

[0008] Further, columns are provided at the four corners of the end of the drilling platform, and the limiting rigging connected to the limiting tugs is respectively connected to the four columns.

[0009] Furthermore, the limiting rigging includes a limiting steel cable and a first shackle, and the limiting steel cable is connected to the column leg through the first shackle.

[0010] Furthermore, a limiting eye plate is connected to the column leg, and the first shackle is detachably connected to the limiting eye plate.

[0011] Furthermore, it further includes a second shackle. A second shackle is connected to one end of the limiting steel cable away from the first shackle, and the limiting steel cable is connected to the limiting tow cable through the second shackle.

[0012] A construction method for the limiting structure of the connection and disconnection of a drilling platform mainly includes the following steps:

[0013] S1. Pre-arrange the limiting rigging at the end of the drilling platform;

[0014] S2. When the limiting operation of the drilling platform is required, the platform deck personnel release the limiting rigging;

[0015] S3. Multiple limiting tugboats respectively pick up the corresponding limiting rigging, connect the limiting rigging to the limiting tow cable on the deck of the limiting tugboat, and release the limiting tow cable;

[0016] S4. Adjust the length of the limiting tow cable and start the limiting operation of the drilling platform.

[0017] Furthermore, four limiting tugboats tension the limiting rigging in four directions to limit the drilling platform in the horizontal direction.

[0018] Furthermore, adjust the tightness of the limiting tow cable to control the in-place accuracy of the drilling platform.

[0019] Furthermore, when connecting the anchor chain between the drilling platform and the seabed, the limiting tugboat restricts the position of the drilling platform so that the drilling platform is connected to the seabed through the anchor chain.

[0020] Furthermore, when disconnecting the anchor chain connecting the drilling platform and the seabed, adjust the heading of multiple limiting tugboats. The limiting tugboats move towards the anchor chain to be disconnected, making the anchor chain to be disconnected loose, and the anchor chain is disconnected by the main operation ship.

[0021] The limiting structure for the connection and disconnection of the drilling platform of the present invention has the following advantages:

[0022] It is connected to the drilling platform through a limiting rigging. The limiting rigging is highly durable and can withstand continuous force for a long time, meeting the long-term limiting requirements. Four limiting tugboats are arranged in four directions of the drilling platform, enabling the limiting tugboats to apply a towing force to the drilling platform at any angle to control the position of the drilling platform, avoiding the need for the limiting tugboats to adjust their positions, improving construction efficiency, and saving construction costs. The four limiting tugboats of this application can adjust their orientations according to the on-site environmental conditions and the position of the main operating vessel, avoiding interference between the limiting tugboats and the main operating vessel and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. is an overall schematic diagram of the limiting structure for connecting and releasing the drilling platform of the present invention;

[0024] Figure 2 FIG. is a schematic diagram of the limiting operation of the limiting structure for connecting and releasing the drilling platform of the present invention;

[0025] Figure 3 FIG. is a schematic diagram of the structure of the limiting rigging of the limiting structure for connecting and releasing the drilling platform of the present invention.

[0026] Description of the reference numerals in the figures:

[0027] 1. Limiting tugboat; 2. Limiting towing cable; 3. Limiting rigging; 31. First shackle; 32. Second shackle; 33. Limiting steel cable; 4. Drilling platform; 5. Leg; 6. Anchor chain; 7. Limiting eye plate; 8. Main operating vessel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments but not other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0030] The following will Figure 1 refer to the appended Figure 3 drawings to describe the limiting structure for connecting and releasing the drilling platform of the present invention.

[0031] As Figure 1As shown in the figure, the limiting structure for connecting and releasing a drilling platform in the present invention includes a plurality of limiting towing wheels 1. The limiting towing cables 2 of the limiting towing wheels 1 are connected to the limiting rigging 3. A plurality of column legs 5 are provided on the drilling platform 4, and the limiting rigging 3 is connected to the column legs 5 on the drilling platform 4 so that a plurality of limiting towing wheels 1 are all connected to the drilling platform 4. By adjusting the length of the limiting towing cable 2, the drilling platform 4 is limited in the horizontal direction so that the drilling platform 4 is connected to the seabed through the anchor chain 6. By adjusting the heading of a plurality of limiting towing wheels 1, the tightness state of the connection between the anchor chain 6 of the drilling platform and the seabed is changed so that the anchor chain 6 in the moving direction of a plurality of limiting towing wheels 1 is released from the connection with the drilling platform.

[0032] Connected to the drilling platform 4 through the limiting rigging 3, the limiting rigging 3 has strong durability and can withstand continuous force for a long time, meeting the long-term limiting requirements. Four limiting towing wheels 1 are arranged in four directions of the drilling platform 4, and the limiting towing wheels 1 can apply towing force to the drilling platform 4 at any angle to control the position of the drilling platform 4, avoiding the adjustment of the ship position by the limiting towing wheels 1, improving the construction efficiency, and saving the construction cost. The four limiting towing wheels 1 of this application can adjust their orientations according to the on-site environmental conditions and the position of the main operating ship 8, avoiding the interference between the limiting towing wheels 1 and the main operating ship 8 and improving the construction efficiency.

[0033] Further, as Figure 1 and Figure 3 shown, column legs 5 are provided at the four corners of the end of the drilling platform 4, and limiting riggings 3 connected to the limiting towing wheels 1 are respectively connected to the four column legs 5; the limiting rigging 3 includes a limiting steel cable 33 and a first shackle 31, and the limiting steel cable 33 is connected to the column leg 5 through the first shackle 31.

[0034] In this embodiment, column legs 5 are preset at the four end corners of the drilling platform 4, and corresponding limiting riggings 3 are respectively connected to the four column legs 5. The end of the limiting rigging 3 far from the column leg 5 is connected to the limiting towing cable 2, thereby realizing the connection between the limiting towing wheel 1 and the drilling platform 4. The limiting towing wheel 1 controls the release length of the limiting towing cable 2, and further controls the tightness state of the limiting rigging 3 to adjust the position of the drilling platform 4.

[0035] The limiting rigging 3 is mainly composed of a limiting steel cable 33. Both ends of the limiting steel cable 33 are provided with connection ports. The first shackle 31 passes through the connection port of the limiting steel cable 33 and is fixed to the column leg 5 through bolts, thereby realizing the connection of the limiting rigging 3 to the drilling platform 4.

[0036] Further, as Figure 3 shown, a limiting eye plate 7 is connected to the column leg 5, and the first shackle 31 is detachably connected to the limiting eye plate 7; a second shackle 32 is further included. One end of the limiting steel cable 33 far from the first shackle 31 is connected to the second shackle 32, and the limiting steel cable 33 is connected to the limiting towing cable 2 through the second shackle 32.

[0037] In this embodiment, a limit eye plate 7 is fixedly connected to each of the four column legs 5 of the drilling platform 4, and the first shackle 31 is screwed to the limit eye plate 7 by bolts to achieve the detachable connection of the first shackle 31.

[0038] One end of the limit cable 33 away from the first shackle 31 is connected with a second shackle 32. The second shackle 32 respectively passes through the connection port of the limit cable 33 and the connection port of the limit tow cable 2, and the second shackle 32 is stably connected to the limit cable 33 and the limit tow cable 2 by bolts.

[0039] This application also provides a construction method for the limit structure of the connection and disconnection of the drilling platform, which mainly includes the following steps:

[0040] S1. Pre-arrange the limit rigging 3 at the end of the drilling platform 4;

[0041] S2. When the limit operation of the drilling platform 4 is required, the platform deck personnel release the limit cable 33 connected to the limit eye plate 7;

[0042] S3. Multiple limit pulleys 1 respectively pick up the corresponding limit cables 33, connect the limit cables 33 to the limit tow cables 2 on the deck of the limit pulleys 1, and release the limit tow cables 2;

[0043] S4. Adjust the length of the limit tow cable, and start the limit operation of the drilling platform.

[0044] Further, as shown in Figure 1 and Figure 2 , as a preferred embodiment, the four limit pulleys 1 tighten the limit cables 33 in four directions to limit the drilling platform 4 in the horizontal direction; when the limit operation of the drilling platform 4 is required, the platform deck personnel release the limit cable 33, and the limit cable 33 is connected to the lead cable. The limit cable 33 is released through the lead cable. The limit pulley 1 picks up the limit cable 33, connects the limit cable 33 to the tow cable 2 of the pulley on the tow pulley deck, and releases the limit tow cable 2.

[0045] As a preferred embodiment, when an anchor chain 6 (for example: A\B\C\D) is connected between the drilling platform 4 and the seabed, the limit pulley 1 restricts the position of the drilling platform 4 so that the drilling platform 4 is connected to the seabed through the anchor chain 6.

[0046] When disconnecting the anchor chain 6 connecting the drilling platform 4 and the seabed, adjust the heading of the multiple limit pulleys 1, and the limit pulleys 1 move towards the anchor chain 6 to be disconnected, so that the anchor chain 6 to be disconnected is slackened, and the anchor chain 6 is disconnected by the main operation ship 8.

[0047] Preferably, when reconnecting or releasing the anchor chain 6(A), the four limiting tugboats 1 are commanded to move the required distance towards the anchor chain 6 and the position of the drilling platform 4 is stabilized. Then, the main operation vessel 8 performs the reconnecting or releasing operation. In addition, the limiting tugboats 1 on the side of the main operation vessel 8 also need to adjust their positions according to the on-site environment to avoid interfering with the main operation vessel 8.

[0048] The limiting structure for connecting and releasing the drilling platform is connected to the drilling platform 4 through the limiting steel cable 33. The limiting rigging 3 has strong durability and can withstand continuous force for a long time, meeting the long-term limiting requirements. The four limiting tugboats 1 are arranged in the four directions of the drilling platform 4, and the limiting tugboats 1 can apply a towing force to the drilling platform 4 at any angle to control the position of the drilling platform 4, avoiding the need for the limiting tugboats 1 to adjust their positions, improving the construction efficiency, and saving construction costs. The four limiting tugboats 1 of the present application can adjust their orientations according to the on-site environmental conditions and the position of the main operation vessel 8, avoiding interference between the limiting tugboats 1 and the main operation vessel 8 and improving the construction efficiency.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A limit structure for connecting and releasing a drilling platform, characterized in that: It includes a plurality of limited tugboats, the limited towing cables of the limited tugboats are connected with the limited rigging, a plurality of column legs are arranged on the drilling platform, and the limited rigging is connected to the column legs on the drilling platform, so that the plurality of limited tugboats are connected with the drilling platform; Adjust the length of the limit towline to limit the drilling platform in the horizontal direction so that the drilling platform is connected to the seabed through the anchor chain; The bow directions of the multiple limit tugboats are adjusted to change the tightness of the connection between the anchor chain of the drilling platform and the seabed, so that the anchor chains in the moving direction of the multiple limit tugboats are released from the connection with the drilling platform.

2. The limiting structure for connection and release of the drilling platform according to claim 1, characterized in that: Column legs are arranged at the four corners of the end of the drilling platform, and the four column legs are respectively connected with limiting rigging connected to the limiting tugboat.

3. The limiting structure for connection and release of the drilling platform according to claim 1, characterized in that: The limiting rigging comprises a limiting steel cable and a first shackle, and the limiting steel cable is connected to the column leg through the first shackle.

4. The limiting structure for connection and release of the drilling platform according to claim 3, characterized in that: A limit eye plate is connected to the column leg, and the first shackle is detachably connected to the limit eye plate.

5. The limiting structure for connection and release of the drilling platform according to claim 3, characterized in that: It also includes a second shackle, and the second shackle is connected to one end of the limiting steel cable away from the first shackle, and the limiting steel cable is connected to the limiting towing cable through the second shackle.

6. A construction method of a limit structure for connecting and releasing a drilling platform, characterized in that: The main steps include: S1. Pre-arrange the limiting rigging at the end of the drilling platform; S2. When the drilling platform needs to be limited, the platform deck personnel release the limiting rigging; S3, multiple limiting tugboats pick up corresponding limiting rigging respectively, connect the limiting rigging with the limiting towing cable on the deck of the limiting tugboat, and release the limiting towing cable; S4. Adjust the length of the limit towing cable and start the limit operation of the drilling platform.

7. The construction method of the limiting structure for connecting and releasing the drilling platform according to claim 6 is characterized in that: The four limiting tugboats tighten the limiting rigging in four directions to limit the drilling platform in the horizontal direction.

8. The construction method of the limiting structure for connecting and releasing the drilling platform according to claim 6, characterized in that: Adjust the tightness of the limit tow cable to control the positioning accuracy of the drilling platform.

9. The construction method of the limiting structure for connecting and releasing a drilling platform according to claim 6, characterized in that: When the anchor chain is connected between the drilling platform and the seabed, the limiting tugboat limits the position of the drilling platform so that the drilling platform is connected to the seabed through the anchor chain.

10. The construction method of the limiting structure for connecting and releasing a drilling platform according to claim 6, characterized in that: When releasing the anchor chain connecting the drilling platform and the seabed, the bow directions of multiple limiting tugboats are adjusted, and the limiting tugboats move toward the direction of the anchor chain to be released to loosen the anchor chain to be released, and the anchor chain is released by the main operation ship.

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