CN212290190U

CN212290190U - Platform-type moon pool and drilling ship with same

Info

Publication number: CN212290190U
Application number: CN202022009826.8U
Authority: CN
Inventors: 何进辉; 张海彬; 单铁兵; 童波; 田雪; 赵建亭
Original assignee: 708th Research Institute of CSIC
Current assignee: 708th Research Institute of CSIC
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-01-05
Anticipated expiration: 2030-09-14

Abstract

The utility model relates to a platform type moon pool and drillship who has platform type moon pool belongs to drillship technical field. The device comprises a rectangular moon pool and a platform in the moon pool; a rectangular moon pool which penetrates from a bottom plate of the ship body to the main deck upwards is arranged in the ship body; the length direction of the rectangular moon pool is parallel to the length direction of the ship body; a first moon pool inner platform is respectively arranged on the bulkhead of the left and right moon pool close to the head end or the tail end of the ship in the rectangular moon pool; an operation space which is communicated to the bottom of the ship is arranged between the platforms in the two moon pools. The utility model discloses a on the basis of current traditional rectangle moon pool scheme, set up the platform respectively at moon pool port and starboard, form a platform type moon pool, can make compact drillship realize the auxiliary well mouth pipeline operation outside the main well mouth pipeline, expanded compact drillship's drilling function, can improve drillship's stability performance and navigation resistance performance simultaneously, be favorable to reducing boats and ships yardstick and operation cost.

Description

Platform-type moon pool and drilling ship with same

Technical Field

The utility model relates to a platform type moon pool and drillship who has platform type moon pool belongs to drillship technical field.

Background

With the exploration and development of oil and gas resources moving to deep water and ultra-deep water sea areas, the ocean oil and gas resource development device meets the continuously improved operation requirements through continuous development and updating. At present, deep sea oil and gas resource development drilling equipment has been developed to the seventh generation, and presents a trend of large-scale, such as adopting larger main scale, larger moon pool size, more complete-function equipment, a double-well frame system and the like, but the cost of the ship and the operation cost are increased. As affected by the us shale gas revolution, oil prices are also expected to wander at low levels, and as such, large marine drilling rigs will continue to bear cost pressures, both currently and for a considerable period of time in the future. Therefore, compact drilling equipment that has previously occupied a place in the market for marine oil and gas resource exploitation devices has been gaining favor again because of its lower construction and operating costs.

For compact drilling equipment, especially for compact drilling ships, a smaller main scale, tonnage and smaller moon pool size are adopted, and higher technical indexes, better efficiency and more reasonable operation cost are realized as far as possible. However, compared with the seventh generation of drilling equipment adopting a double-derrick and double-pipeline operation mode, the compact drilling equipment is limited by the main scale of the ship and the scale of the moon pool, and the double-pipeline operation is often difficult to realize. The drilling technical indexes and functions of the compact drilling equipment are naturally weaker than those of the large-scale seventh generation drilling equipment. If the double-pipeline operation is realized on compact drilling equipment, at least a large moon pool opening needs to be designed, and meanwhile, the stability, the resistance performance and the like of the ship are greatly influenced.

The moon pool is used as a special structure of the drilling ship and is directly connected with external seawater, when the drilling ship sails, the resistance caused by shaking of a water body in the moon pool is increased and can reach 50%, the loss of energy is inevitably increased when the drilling ship sails, the operation cost is further improved, and the larger the moon pool scale is, the more the sailing resistance of the ship is increased. In addition, the drilling ship adopts a smaller main scale scheme, which means that the stability requirement of the drilling ship is higher, and the center of gravity of the drilling ship is lower as much as possible in arrangement so as to ensure that the stability of the drilling ship can meet the safety requirement.

Therefore, aiming at the contradiction that the compact drilling ship needs to ensure the drilling technical index, realize the double-pipeline operation of the main wellhead and the auxiliary wellhead and reduce the main scale and the operation cost of the ship, a moon pool scheme which is simple and practical, meets the drilling operation requirement and can reduce the resistance of the drilling ship needs to be developed. The solution is an important means for solving the above contradiction, and is also a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The utility model aims at solving the technical problem that how to design the moon pool for compact drillship in order to realize the double-pipeline operation to satisfy the requirement of hull stability, reduce the drillship resistance simultaneously.

In order to solve the above problems, the technical solution adopted by the present invention is to provide a platform-type moon pool, which comprises a rectangular moon pool and a platform in the moon pool; a rectangular moon pool which penetrates from a bottom plate of the ship body to the main deck upwards is arranged in the ship body; the length direction of the rectangular moon pool is parallel to the length direction of the ship body; a first moon pool inner platform is respectively arranged on the bulkhead of the left and right moon pool close to the head end or the tail end of the ship in the rectangular moon pool; an operation space which is communicated to the bottom of the ship is arranged between the platforms in the two moon pools.

Preferably, the platform in the moon pool is arranged at the same end of the head end or the tail end of the ship.

Preferably, the bottom of the platform in the moon pool is arranged to be flush with the bottom plate of the ship body, and the top of the platform in the moon pool is arranged to be higher than the operation water line of the ship body and lower than the main deck of the ship body.

Preferably, the length of the platform in the moon pool is set to be 10% -60% of the length of the rectangular moon pool.

Preferably, the width of the platform in the moon pool is set to be 10% -40% of the width of the rectangular moon pool.

Preferably, the working space is provided with an opening which penetrates downwards to the bottom of the ship and is directly connected with seawater, and the working space is provided with an unshielded opening which extends upwards to the main deck.

Preferably, the rectangular moon pool bottom is provided with a flared opening for enlarging the allowable maximum deflection angle of the drilling pipeline.

Preferably, a flared opening gradually increasing downwards is arranged between the bottom of the rectangular moon pool and the moon pool bulkhead on the port and the starboard of the rectangular moon pool; the projection of the horn-shaped opening on the cross section of the rectangular moon pool is set as a virtual trapezoid, and the height of the trapezoid is set to be 1.4-6.0 m from the bottom of the rectangular moon pool upwards; the ratio of the difference between the lengths of the upper end and the lower end of the trapezoid to the height of the trapezoid is set to be 1:3-2: 1.

Preferably, a connecting platform for personnel to pass between the two platforms in the moon pool on the port and the starboard is arranged between the two platforms in the moon pool; the height of the connecting platform is consistent with the height of the platforms in the two moon pools.

The utility model discloses still provide the drillship who has above-mentioned platform type moon pool.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses realized the requirement that main well head pipeline operation and supplementary well head pipeline operation go on simultaneously in compact drilling ship, compact drilling ship stability has been improved simultaneously, resistance performance scheduling problem, a platform type moon pool and the design of the drilling ship that has this moon pool are provided, it can provide other pipeline operation spaces outside the main well head pipeline operation, form other mud closed circulation channel, can also reduce water body amplitude of rocking and drilling ship navigation resistance in the moon pool, reduce the rig floor height and then improve drilling ship stability.

The utility model discloses a on the basis of current traditional rectangle moon pool scheme, set up the platform respectively at moon pool port and starboard, form a new platform type moon pool scheme, can make compact drillship realize the auxiliary well mouth pipeline operation outside main well mouth pipeline, expanded compact drillship's drilling function, can improve drillship's stability performance and navigation resistance performance simultaneously, be favorable to reducing boats and ships yardstick and operation cost.

Drawings

Fig. 1 is a schematic top view of a platform-type moon pool according to the present invention;

fig. 2 is a cross-sectional view taken along a line a-a in fig. 1 in the direction of the length of the ship according to the present invention;

fig. 3 is a schematic diagram illustrating the blowout preventer during operation moving from a vessel port main deck storage position to below the rig floor;

fig. 4 is a schematic structural view showing the marine riser drilling operation process of the present invention;

fig. 5 is a schematic structural view showing the relative positional relationship of the equipment in place during the drilling operation of the riser-free mud closed-loop dual-pipeline drilling operation of the present invention;

fig. 6 shows a graph of the variation of the relative effective power (resistance) of a ship in a moon pool with the change of the speed during the navigation, the ship using the conventional rectangular moon pool, and the ship using the moon pool of the present invention. In the figure, the X-axis value represents the speed (nautical miles per hour) and the Y-axis value represents the available power.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:

as shown in fig. 1-6, the utility model provides a platform-type moon pool, which comprises a rectangular moon pool and a platform in the moon pool; a rectangular moon pool which penetrates from a bottom plate of the ship body to the main deck upwards is arranged in the ship body; the length direction of the rectangular moon pool is parallel to the length direction of the ship body; a first moon pool inner platform is respectively arranged on the bulkhead of the left and right moon pool close to the head end or the tail end of the ship in the rectangular moon pool; an operation space which is communicated to the bottom of the ship is arranged between the platforms in the two moon pools. The platform in the moon pool is arranged at the same end of the ship head end or the ship tail end. The bottom of platform in the moon pool is established to be higher than hull operation waterline, is less than hull main deck simultaneously for with hull bottom plate parallel and level, the top of platform in the moon pool. The length of the platform in the moon pool is set to be 10% -60% of the length of the rectangular moon pool. The width of the platform in the moon pool is set to be 10% -40% of the width of the rectangular moon pool. The operation space between the platforms in the moon pool is provided with an opening which is downwards communicated to the bottom of the ship and is directly connected with seawater, and the operation space is provided with an opening which upwards extends to the main deck and is not shielded. The bottom of the rectangular moon pool is provided with a trumpet-shaped opening used for enlarging the allowable maximum deflection angle of the drilling pipeline. A horn-shaped opening gradually increasing downwards is formed between the bottom of the rectangular moon pool and the moon pool bulkhead on the port and the starboard of the rectangular moon pool; the projection of the horn-shaped opening on the cross section of the rectangular moon pool is a virtual trapezoid, and the height of the trapezoid is 1.4-6.0 meters from the bottom of the rectangular moon pool upwards; the ratio of the difference between the lengths of the upper end and the lower end of the trapezoid to the height of the trapezoid is 1:3-2: 1. A connecting platform for personnel to pass between the platforms in the two moon pools on the port and the starboard is arranged between the platforms in the two moon pools; the height of the connecting platform is consistent with the height of the platforms in the two moon pools.

The utility model provides a technical scheme of drillship with platform type moon pool.

Examples

The present invention will be described in detail and specifically with reference to the embodiments shown in fig. 1-6 for better understanding, but the scope of the present invention is not limited by the embodiments described below.

Fig. 1 is a plan view of a moon pool scheme according to an embodiment of the present invention, and fig. 2 is a sectional view taken along a-a section in fig. 1 in a ship length direction.

Referring to fig. 1 and 2, a rectangular moon pool 2 is provided in a drillship 1, the rectangular moon pool 2 having a length direction along the length direction of the drillship 1 and a length L1; the width direction is the ship width direction along the drill ship 1, the width is W1, and the center is arranged; the rectangular moon pool 2 extends from the bottom board 7 to the main deck 6 to form a through space.

In the rectangular moon pool 2 of fig. 1, two

platforms

3 and 4 are provided in the moon pool on the side near the bow or stern, respectively, and the

platforms

3 and 4 have a maximum length of L2 and a maximum width of W2. The maximum length L2 of the

platforms

3 and 4 should be 10% to 60% of the length L1 of the rectangular moon pool 2 and the maximum width W2 should be 10% to 40% of the rectangular moon pool W1.

The

platforms

3 and 4 may be configured to be port and starboard symmetrical or may be configured to be port and starboard asymmetrical, it being understood that the shape of the platforms is for example only and that various shapes may be used, but neither the maximum length nor the maximum width thereof should exceed the maximum length L2 and the maximum width W2 described above. The height H1 of the

platforms

3 and 4 ranges from the bottom board 7 to above the waterline and below the main deck.

Between the

platforms

3 and 4 there is formed a working space 11 through the bottom of the vessel to the main deck, which is the working space of the auxiliary wellhead 9 for the passage of the mud return line, down to the seabed and up to the connection mud handling system, thus forming a closed circulation path for the mud from the seabed to the drill ship independent of the main wellhead line. The remaining area of the rectangular moon pool 2, excluding the working space 11, is a working space 10, which is the working space of the main wellhead 8.

No division is arranged between the operation space 10 and the operation space 11, the water body can freely enter the operation space 11 from the operation space 10, a drilling pipe column hung on the main wellhead 8 can be horizontally moved to the auxiliary wellhead 9 through a trolley to be continuously hung, the auxiliary wellhead 9 can be subjected to slurry closed circulation operation after the horizontal movement, the main wellhead 8 can be subjected to drilling operation simultaneously, the closed circulation of the slurry without a marine riser can be realized, and the operation efficiency is improved.

Set up connection platform 5 between port board platform 3 and starboard platform 4, platform 5 height and platform 3 and platform 4 parallel and level, personnel can pass each other between 3 platforms.

Referring to fig. 3, fig. 3 illustrates the operation of moving the blowout preventer from a vessel port main deck storage location to below the drill floor. In a sailing state of the drilling ship and a state before operation starts, the blowout preventer 13 is stored in the port main deck storage area 12, after the operation starts, the blowout preventer is transversely moved to a position right above the moonpool pit 14 and the

platforms

3 and 4 through the blowout preventer lifting device and is lowered to the height of the lower plane of the drill floor 16 after the moonpool trolley 15 is in place, and the height of the blowout preventer 13 can be lower than that of the lower plane of the drill floor 16. The moon pool trolley 15 is movable along rails 17 provided on the main deck in the length direction of the hull to transport the blowout preventers 13 to the well head below the drill floor 16. Therefore, the height of the drill floor can be effectively reduced in the design process of the drill floor 16, so that the height of the center of gravity of the drilling ship is reduced, and ship stability is facilitated.

Referring to figure 4, during conventional riser drilling operations, the drill ship may roll to some extent under wave motion, and the riser 19 may experience a yaw angle 20 relative to the hull. To avoid collision of the riser 19 with the hull, it is often necessary to limit the roll amplitude of the drill ship. The larger the deflection angle, the stronger the environmental suitability of the drillship, and the longer the operating window. The utility model discloses the height that sets up bilateral symmetry in 2 both sides bottom positions in rectangle moon pool is H2 width for the horn mouth 18 of W4, and the scope of the high H2 of horn mouth 18 is confirmed according to the 19 scope requirements of deflecting of marine riser, upwards extends to 1.4 meters to 6.0 meters scope for apart from bottom plate 7 usually. The width to height gradient W4/H2 of the flare 18 ranges from 1:6 to 1: 1.

The bell mouth 18 is arranged at the bottom of the wall of the moon pool, so that the allowable deflection angle range and the allowable ship body transverse rocking angle range of the marine riser 19 can be enlarged on the premise of not increasing the water plane area of the moon pool and the size of the moon pool, and the operation window period of the drilling ship is prolonged.

Referring to fig. 5, the relative position of the equipment in place during closed loop dual line drilling operations with no riser mud is shown. After the mud return line 21 is installed and connected at a position above the main wellhead 8, it is translated backwards by the moon pool trolley 15 along the length direction of the hull to be suspended above the auxiliary wellhead 9 and connected to the mud treatment module 22. The main wellhead 8 may provide a new working space for further drilling operations in a pipeline such as a drill string 23. The seabed suction module is arranged near the seabed of the main wellhead 8, so that slurry in a seabed shaft can be collected and concentrated, the seabed suction module is connected with a seabed pump 25 through a pipeline, the slurry is conveyed upwards to the slurry treatment module 22 through the seabed pump 25, and finally a riser-free slurry closed circulation operation process is formed.

Referring to fig. 6, there are shown a moonpool-less ship, a ship type using a conventional rectangular moonpool, and a ship relative effective power (resistance) using the moonpool of the present invention, which is completely consistent in all the parameters except for the difference in the moonpool plan. The percentage of available power (drag) for the different vessels is listed based on the available power (drag) of the moonpool-less vessel 5 knots.

Fig. 6 shows that the ship with the moon pool has a larger resistance than the ship without the moon pool, and the moon pool gives an increased resistance to the sailing ship, and the higher the speed, the larger the magnitude of the increase in resistance. Compare with adopting traditional rectangle moon pool boats and ships, use the utility model discloses a moon pool boats and ships, moon pool waterline area are the same basically with traditional rectangle moon pool, and under being greater than 11 hai/hour navigational speed circumstances, effective power (resistance) are littleer. Use promptly the utility model discloses the boats and ships in moon pool can effectively improve the navigation resistance of boats and ships in the higher condition of navigational speed, and along with the increase of navigational speed, improve the effect more obvious. When the navigation speed reaches 14 nautical miles per hour, the resistance improvement effect can reach 15%, namely the power output can be reduced by 15% during navigation, and the purposes of energy conservation and emission reduction are achieved.

The utility model discloses to current compact drillship receive factor influences such as major dimension, moon pool yardstick and operation cost, have certain restriction in aspects such as double-pipeline operation ability, stability performance, resistance performance, traditional rectangle moon pool scheme is difficult to satisfy above-mentioned three performance requirement simultaneously. To the above problem, the utility model provides a platform type moon pool scheme to less moon pool yardstick and waterline face area realize the double-line operation, and can effectively improve resistance performance, and be convenient for transfer and taking one's place of preventer, reduce the rig floor height, improve boats and ships stationarity performance.

The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.

Claims

1. A platform type moon pool is characterized in that: the device comprises a rectangular moon pool and a platform in the moon pool; a rectangular moon pool which penetrates from a bottom plate of the ship body to the main deck upwards is arranged in the ship body; the length direction of the rectangular moon pool is parallel to the length direction of the ship body; a first moon pool inner platform is respectively arranged on the bulkhead of the left and right moon pool close to the head end or the tail end of the ship in the rectangular moon pool; an operation space which is communicated to the bottom of the ship is arranged between the platforms in the two moon pools.

2. The platform moon pool of claim 1, wherein: the platform in the moon pool is arranged at the same end of the head end or the tail end of the ship.

3. The platform moon pool of claim 1, wherein: the bottom of the platform in the moon pool is arranged to be parallel and level with the bottom plate of the ship body, and the top of the platform in the moon pool is arranged to be higher than the operation water line of the ship body and lower than the main deck of the ship body.

4. A platform moon pool according to claim 3, wherein: the length of the platform in the moon pool is set to be 10% -60% of the length of the rectangular moon pool.

5. The platform moon pool of claim 4, wherein: the width of the platform in the moon pool is set to be 10% -40% of the width of the rectangular moon pool.

6. The platform moon pool of claim 5, wherein: the working space is provided with an opening which is downwards communicated to the bottom of the ship and is directly connected with seawater, and the working space is provided with an opening which upwards extends to the main deck and is not shielded.

7. The platform moon pool of claim 6, wherein: and a horn-shaped opening used for expanding the allowable maximum deflection angle of the drilling pipeline is arranged at the bottom of the rectangular moon pool.

8. The platform moon pool of claim 7, wherein: a horn-shaped opening gradually increasing downwards is formed between the bottom of the rectangular moon pool and the moon pool bulkhead on the port and starboard of the rectangular moon pool; the projection of the horn-shaped opening on the cross section of the rectangular moon pool is set as a virtual trapezoid, and the height of the trapezoid is set to be 1.4-6.0 m from the bottom of the rectangular moon pool upwards; the ratio of the difference between the lengths of the upper and lower ends of the trapezoid which are relatively parallel to the height of the trapezoid is set to be 1:3-2: 1.

9. The platform moon pool of claim 8, wherein: a connecting platform for personnel to pass between the platforms in the two moon pools on the port and the starboard is arranged between the platforms in the two moon pools; the height of the connecting platform is consistent with the height of the platforms in the two moon pools.

10. A drilling ship having a platform moon pool according to any one of claims 1 to 9.