CN109866888B - Relative motion restraining device for dry tree semi-submersible platform heave plate and main hull - Google Patents
Relative motion restraining device for dry tree semi-submersible platform heave plate and main hull Download PDFInfo
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Abstract
The invention discloses a device for inhibiting relative motion of a dry tree semi-submersible platform heave plate and a main hull. The relative motion suppression device comprises an X-shaped motion suppression anchor cable group, an anchor cable guiding and locking device and an energy buffer device; the X-shaped motion suppression anchor cable group comprises 2 upper anchor cables and 2 lower anchor cables, and the 2 upper anchor cables and the 2 lower anchor cables are arranged between a droop swinging plate of the dry tree semi-submersible platform and the main hull in an X shape; the anchor cable guiding and locking device is arranged on the upright post of the dry-tree semi-submersible platform and can apply pretension to the anchor cable at the upper part and lock the anchor cable; the lower anchor cable is connected with the drooping swing plate, and the upper anchor cable is connected with the energy buffer device after being guided by the anchor cable guiding and locking device. The X-type anchor cable lifting device adopts the elastic support, and the X-type anchor cable is introduced into the platform upright column energy buffer cabin to be connected with the counterweight, so that the X-type anchor cable lifting device is used for buffering the inertia force generated by the motion of the platform drooping swing plate, the impact force of the anchor cable and the base structure can be effectively reduced, and the fatigue strength and the reliability of corresponding components are improved.
Description
Technical Field
The invention relates to a device for inhibiting relative motion of a dry tree semi-submersible platform heave plate and a main hull, and belongs to the technical field of deepwater ocean oil and gas development.
Background
The deepwater floating platform is the main equipment for deepwater ocean oil and gas development at present, and the semi-submersible type platform has obvious advantages in the aspects of construction, installation and economy compared with a single-column platform and a tension leg platform. However, the heave motion performance of the existing semi-submersible platform is poor, and a wet-type Christmas tree is required to be adopted when the semi-submersible platform is used as a deepwater oil and gas development and production platform, and the wet-type Christmas tree is complex in technology and high in price. The dry-type Christmas tree has the advantages of convenient well repair, low operation cost, short downtime, good flow safety and the like, and only a tension leg platform and a single-column platform can support the dry-type Christmas tree at present because the dry-type Christmas tree requires a low heave motion amplitude of the platform. Compared with the two platforms, the semi-submersible production platform has the advantages of no restriction of water depth, large variable load, capability of towing integrally and the like, and in recent years, the ocean engineering industry aims to improve the motion performance of the semi-submersible platform so that the semi-submersible platform can support a dry Christmas tree. Patent application document (patent application No. 201710873116.X) discloses a novel deepwater floating multifunctional dry tree semi-submersible platform (fig. 1) which can realize condensate storage and export and can adopt a dry production tree and is used in the field of ocean oil and gas development, and the main structure of the platform is composed of an upper main hull 4, a lower heave plate structure 5, an upper main hull and lower heave plate elongated flexible rod structure 6, a mooring system 7 and a top tensioning riser system 8. The slender flexible rod structure is connected with the upper main hull and the lower heave plate through flexible connecting members or rotary joints with certain rigidity, so that bending moment between the slender flexible member and the upper main hull and between the slender flexible member and the lower heave plate is released, connection of the small-scale members of the upper main hull and the lower heave plate is realized, construction and installation are greatly simplified, and fatigue life and reliability of a structural connection part are improved. Due to the fact that the upper main hull and the lower heave plate are connected in the mode, the long and thin flexible rod piece is long, relative motion can be generated between the upper main hull and the lower heave plate, and particularly, large relative motion can be generated under severe sea conditions such as typhoons, so that flexible connecting members among the long and thin flexible rod piece structure, the upper main hull and the lower heave plate and the joint of the top tensioning type vertical pipe penetrating through the middle of the lower heave plate and the lower heave plate are structurally designed, difficult to manufacture and high in cost. The relative motion between the lower heave plate and the upper main hull is effectively inhibited, the design and construction difficulty of the key connection structures of the platforms is effectively reduced, and the engineering cost is reduced.
Disclosure of Invention
The invention aims to provide a device for inhibiting the relative motion of a heave plate of a dry tree semi-submersible platform and a main hull, which can effectively inhibit the relative motion of the heave plate of the platform and the main hull, has simple and convenient installation method, reduces the design and construction difficulty of a key connection structure of the platform, and improves the safety and reliability of the platform.
The invention relates to a dry tree semi-submersible platform which is a deep-water floating multifunctional dry tree semi-submersible platform disclosed in Chinese patent application (application number 201710873116. X).
The invention provides a relative motion restraining device for a vertical swinging plate of a dry tree semi-submersible platform and a main hull, which comprises an X-shaped motion restraining anchor cable group, an anchor cable guiding and locking device and an energy buffering device;
the X-shaped motion suppression anchor cable group comprises 2 upper anchor cables and 2 lower anchor cables, and the 2 upper anchor cables and the 2 lower anchor cables are arranged between a droop swinging plate of the dry tree semi-submersible platform and a main hull in an X shape;
the anchor cable guiding and locking device is arranged on an upright post of the dry-tree semi-submersible platform and can apply pretension to the upper anchor cable and lock the upper anchor cable;
the lower anchor cable is connected with the drooping swing plate, the upper anchor cable is connected with the energy buffering device after being guided by the anchor cable guiding and locking device, and the energy buffering device can buffer the impact force generated by the X-shaped motion suppression anchor cable group due to the motion of the drooping swing plate;
and a set of relative motion inhibiting device is arranged on the outer side planes of every two adjacent stand columns on the dry tree semi-submersible platform.
And the outer side planes of every two adjacent stand columns on the dry tree semi-submersible platform are provided with one set of X-shaped motion inhibition anchor cable, namely four sets of X-shaped motion inhibition anchor cables are arranged on four sides of the four-stand-column platform, and three sets of X-shaped motion inhibition anchor cables are arranged on three sides of the three-stand-column platform so as to inhibit the motion in each horizontal direction between the heave plate and the main hull.
In the above-mentioned relative movement suppression device, the cross-shaped intersections of the 2 upper anchor cables and the 2 lower anchor cables are connected by a cross-shaped connection plate, which may be welded or cast;
2, the lower anchor cables are connected to two sides of the drooping swing plate through a hanging point connecting structure;
the hoisting point connecting structure comprises a hoisting point and a connecting joint which can be connected and detached underwater, so that the hoisting point connecting structure and the lower anchor cable can be detached underwater through the underwater connecting joint.
In the above-mentioned relative movement restraining device, the anchor cable guiding and locking device includes a first guide wheel disposed at a lower portion of the upright column, a second guide wheel disposed at an upper portion of the upright column, and an anchor cable lifting and locking device;
the upper anchor cable is guided to the anchor cable lifting and locking device through the first guide wheel and then guided to the energy buffering device through the second guide wheel;
the anchor cable lifting and locking device utilizes a hydraulic cylinder or a mechanical device to exert pretension on the upper anchor cable and realize the locking effect.
In the above-mentioned relative motion suppression device, the first guide wheel is disposed in the direction close to the central axis of the hull and can swing left and right to adapt to the relative motion between the heave plate and the main hull in all directions.
In the above-mentioned relative movement restraining device, the energy buffer device comprises an elastic support arranged at the top of the upright post and an energy buffer cabin arranged inside the upright post;
the anchor cable lifting and locking device is arranged on the elastic support;
and the upper anchor cable extends into the energy buffer cabin.
In the above-mentioned relative movement restraining device, the elastic support is provided on the support structure;
the elastic support is flexibly supported by a spiral spring;
in a normal operation state, the anchor cable lifting and locking device locks the upper anchor cable on the elastic support, and the impact force generated by the relative motion between the heave plate and the main hull is buffered by the elastic support.
In the above-mentioned relative movement suppression device, the upper part of the energy buffer cabin is provided with an anchor cable guide inlet and outlet;
the inner cabin wall of the energy buffer cabin is provided with a slide rail;
a counterweight is arranged in the energy buffer cabin, and a buffer elastic mechanism is arranged at the lower part of the counterweight;
the upper anchor cable penetrates through the anchor cable guide inlet and then is connected with the counterweight, and the counterweight can move along the slide rail;
the buffering elastic mechanism comprises a spiral spring and a damping energy absorption device arranged on the spiral spring; when the sea condition is too severe, the counterweight moves up and down along the slide rail, and the buffering elastic mechanism at the bottom is used for buffering the impact of the counterweight.
The bench wind comes the survival state, unties the stand top anchor rope promotes locking device, the counter weight is because gravity passes through the guide structure tensioning the upper portion anchor rope, through the relative motion between counter weight gravity suppression heave plate and the main hull, when the violent motion of platform, the counter weight is in follow in the energy cushion capsule the slide rail up-and-down motion absorbs the energy that the relative motion produced, simultaneously lower part in the energy cushion capsule buffering elastic mechanism can cushion absorption owing the too big production of counter weight downstream is right the impact force of energy cushion capsule structure reaches the purpose of buffering the impact force of relative motion between heave plate and the main hull to suppression device production.
In the above-mentioned relative movement suppression device, the upper anchor cable and the lower anchor cable are both anchor chains or wire ropes, and the required mechanical index is designed according to the platform performance and the operation sea condition.
In the above-mentioned relative motion suppression device, the elastic support, the weight of the counterweight and the specific technical indexes of the buffering elastic mechanism which are arranged at the top of the upright post are designed according to different platform scales and operation sea conditions.
The relative movement suppression device of the present invention may be installed as follows:
1) before the platform is installed, the lifting point connecting structure is installed at the corresponding position of the lower heave plate and is integrally installed in place along with the platform;
2) the energy buffer cabin in the upright post is built together with the platform body in the platform building process, and the counterweight and the bilge buffer elastic mechanism are debugged before the platform is installed;
3) after the platform main body is installed, leading out anchor cables from the energy buffer cabins corresponding to the stand columns on the two sides, enabling one ends of the anchor cables to be located in the energy buffer cabins, enabling the other ends of the anchor cables to penetrate through first guide wheels on the lower portions of the stand columns downwards along the turning directions of second guide wheels and anchor cable lifting and locking devices on the top portions of the stand columns, enabling the anchor cables on the two sides to be connected with a cross connecting plate on an installation ship, connecting the anchor cables from an X-shaped anchor cable cross connecting plate to a heave plate part to the cross connecting plate, then lowering the cross connecting plate, connecting the X-shaped anchor cables with a heave plate lifting point connecting device through an underwater connecting street, and pre;
4) installing a main hull and a droop swinging plate restraining device on each side of the platform according to the method, and then tensioning each anchor cable to preset pretension through a corresponding anchor cable lifting and locking device and locking;
5) and connecting the anchor chain and the counterweight in the upright post energy buffer cabin, and ensuring that the anchor cable has certain tension between the counterweight and the anchor cable lifting and locking device, namely the anchor cable is in a tensioning state, so that the installation of the whole set of restraining device is completed.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the device for inhibiting the relative motion between the main hull and the heave plate of the dry tree semi-submersible platform can effectively inhibit the relative motion between the main hull and the heave plate of the dry tree semi-submersible platform disclosed as 201710873116.X after the installation is finished, reduce the design difficulty of the connecting joint of the slender rod piece between the main hull and the heave plate of the platform and the main hull and the heave plate, and improve the safety and reliability of the device.
2. The X-type anchor cable lifting device adopts the elastic support, and the X-type anchor cable is introduced into the platform upright column energy buffer cabin to be connected with the counterweight, so that the X-type anchor cable lifting device is used for buffering the inertia force generated by the motion of the platform drooping swing plate, the impact force of the anchor cable and the base structure can be effectively reduced, and the fatigue strength and the reliability of corresponding components are improved.
3. The invention has different buffer strategies in different states of the platform, namely, in a normal operation state (without typhoon production operation), the X-shaped anchor cable is locked at the lifting device at the top of the upright post, the impact force is buffered by the elastic support at the top of the upright post, and the relative motion between the main hull of the platform and the heave plate is restrained to the maximum extent; opening an X-type anchor cable at a lifting device at the top of the upright post in a living state (typhoon), absorbing buffering impact by the aid of the gravity of a counterweight in a buffer cabin inside the upright post, reducing impact force of violent movement of a sagging swinging plate caused by severe typhoon environment on a restraining device, and restraining relative movement between a main hull of the platform and the sagging swinging plate to be below a specific amplitude value; the buffering strategy can effectively improve the suppression efficiency of the buffering device and reduce the design and manufacturing cost of the suppression device.
4. The invention can adopt a platform crane or other small auxiliary devices to complete the installation and the disassembly of the restraining device, does not need large-scale construction equipment, is convenient and flexible, and has low installation and maintenance cost.
Drawings
FIG. 1 is a schematic diagram of the general structure of a dry tree semi-submersible platform to which the present invention is applied;
FIG. 2 is a schematic view of the present invention mounted on the outside of two uprights at the front of the platform;
FIG. 3 is a schematic view of the present invention installed on the outer sides of two columns on the side of a platform;
FIG. 4 is a schematic view of a cross-shaped anchor cable of the present invention;
FIG. 5 is a sectional view taken along line A-A;
figure 6 is an enlarged view of the section a-a of the top of the column spring base and the surge tank.
The respective symbols in the figure are as follows:
11 lower anchor cables, 13 upper anchor cables, 12 cross plate connecting structures, 121 main bodies, 122 connecting lifting holes, 123 connecting clamping rings, 21 lifting point connecting structures, 22 guide wheel bases, 23 first guide wheels, 24 anchor cable lifting locking devices, 25 second guide wheels, 31 supporting structures, 32 elastic supports, 33 energy buffer cabins, 331 guide bellmouths, 332 energy buffer cabin bulkheads, 333 slide rails, 334 counterweights, 335 buffer elastic mechanisms, 4 upper main hulls, 5 lower heave plate structures, 6 upper main hull and lower heave plate elongated flexible rod structures, 7 mooring systems and 8 top tensioning riser systems.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
Aiming at a deep-water floating multifunctional dry-tree semi-submersible platform shown in figure 1, the invention provides a relative motion restraining device for a heave plate of a dry-tree semi-submersible platform and a main hull, which comprises an X-shaped motion restraining anchor cable group, an anchor cable lifting guide locking device and an energy buffering device. According to the number of the platform columns, a set of relative motion suppression device is installed on the outer side plane of each adjacent column of the platform, for example, four sets of relative motion suppression devices need to be installed on a four-column platform, three sets of relative motion suppression devices need to be installed on a three-column platform, and the following description takes the four-column platform as an example.
The relative motion restraining devices on the front side, the rear side, the left side and the right side of the platform are in the same form, and the total number is four. As shown in fig. 2, 3, 5 and 6, the anchor cable lifting, guiding and locking device comprises a first guide wheel 23 at the bottom of the upright, an anchor cable lifting and locking device 24 at the top of the upright and a second guide wheel 25, wherein the bottom of the upright is provided with a guide wheel base 22, and the first guide wheel 23 is mounted on one side of the guide wheel base 22 close to the central axis of the platform and can swing left and right to adapt to the vertical movement of the drooping swing plate along the plane of the x-shaped anchor cable; the anchor cable lifting and locking device 24 is used for lifting the X-shaped movement restraining anchor cable group and applying pretension; the second guide wheel 25 is used to guide the anchor line to the energy buffer means.
As shown in fig. 2-5, the x-shaped movement restraining anchor cable set includes 2 lower anchor cables 11 and 2 upper anchor cables 13, wherein the 2 lower anchor cables 11 are used for connecting the cross plate connecting structure 12 and the hoisting point connecting structure 21, and the lower anchor cables 11 and the hoisting point connecting structure 21 are connected by connecting joints which can be disassembled and assembled underwater, so as to realize underwater connection and disassembly; the 2 upper anchor cables 13 are connected with the cross plate connecting structure 12, are respectively folded upwards through the first guide wheels 23 positioned on the upright columns at two sides, are folded towards the middle part of the platform through the anchor cable lifting and locking devices 24, then downwards penetrate through the energy buffer cabin 32 through the second guide wheels 25, and are connected with the counterweight 324. The cross plate connecting structure 12 (as shown in fig. 4) is a key connecting structure forming a form of an anchor cable x, and includes a main body 121, a connecting hanging hole 122 and a connecting snap ring 123.
As shown in fig. 5-6, the energy buffer device comprises an elastic support 32 at the top of the column and an energy buffer compartment 33 inside the column. The elastic support 32 is provided with elasticity by a plurality of parallel helical springs, sits on the support structure 31, and is used for buffering impact force generated by inertia of the heave plate in an operating state. The energy buffer cabin 33 comprises anchor cables penetrating into a guide bell mouth 331, an energy buffer cabin bulkhead 332, a counterweight up-and-down movement guide slide rail 333, a counterweight 334 and a buffer elastic mechanism 335, each anchor cable penetrates into the guide bell mouth 331 through an anchor cable, penetrates into the energy buffer cabin 33 and is connected with the counterweight 334, and the counterweight 334 can move up and down along the slide rail 333 to buffer the violent movement impact force of a lower swing plate; sliding rails 333 are arranged on the four sides of the energy buffer cabin to restrain the horizontal displacement of the counterweight 334; the counterweight 334 is of a box-shaped hollow structure, and heavy objects such as iron-steel sand and the like are filled in the counterweight; the buffer elastic mechanism 335 is a parallel spiral spring supporting top plate structure, and a hydraulic damper or other type of damper is arranged between the parallel spiral spring supporting top plate structure, so that the falling energy of the counter weight is absorbed in a buffer mode.
In the above embodiments, the upper cable wire and the lower cable wire may be in the form of chain or wire rope.
In the above embodiment, after the x-shaped motion suppression anchor cable group is installed, an x-shaped anchor cable structure is formed between the main hull of each side of the platform and the heave plate, and meanwhile, the anchor cables are designed to be in a tensioning state and have pre-tension, so that the motion of the main hull of the platform and the x-shaped anchor cable structure of the heave swing plate in the plane can be suppressed, and therefore, the relative motion of the main hull of the platform and the heave swing plate in each horizontal direction can be suppressed after the x-shaped anchor cable structures installed on the front side, the rear side, the left side and the right side.
In the above embodiment, after the installation of the restraining device is completed, the whole system of the x-shaped motion restraining anchor cable set is in a tensioned state, the anchor cable lifting and locking device 24 locks the upper anchor cable 13 to the elastic support 32 in a normal operation state, and the elastic support 32 buffers and restrains the impact force generated by the relative motion between the droop swinging plate and the main hull; when the platform moves violently, the counterweight moves up and down along the slide rail 333 in the energy buffer cabin to absorb energy generated by the relative movement, and meanwhile, the lower buffering elastic mechanism 335 in the energy buffer cabin can buffer and absorb the impact force of the downward movement of the counterweight on the cabin structure of the ship body.
The device for inhibiting the relative motion between the heave plate of the dry tree semi-submersible platform and the main hull can be installed according to the following method:
1) the lifting point connecting structure 21 is arranged at the corresponding position of the lower heave plate and is integrally arranged in place along with the platform;
2) the energy buffer cabin 33 and the platform are built and debugged together, and the counterweight 334, the buffer elastic mechanism 335 and the slide rail 333 are debugged in a shipyard to have a matching function;
3) after the platform main body is installed on the sea, the anchor cables are led out from the energy buffer cabins 33 corresponding to the upright columns on the two sides, one ends of the anchor cables are located in the buffer cabins, the other ends of the anchor cables penetrate through the first guide wheels 23 on the lower portions of the upright columns downwards along the upright columns in a turning mode through the second guide wheels 25 and the anchor cable lifting and locking devices 24 on the tops of the upright columns, then the anchor cables on the two sides are connected with the cross connecting plate 12 on an installation ship, meanwhile, the lower anchor cable 11 on the lower portion of the X-shaped anchor cable is connected to the cross connecting plate 12, the cross connecting plate 12 is lowered, the X-shaped anchor cable and the heave plate hanging point connecting structure 21 are connected through the underwater connecting joint, an X-shaped anchor cable;
4) installing main ship bodies and drooping swing plate restraining devices on the front side, the rear side, the left side and the right side of the platform according to the method, and then tensioning each anchor cable to preset pretension through a corresponding lifting locking device and locking;
5) connecting the anchor cable and the counterweight 334 in the upright post energy buffer cabin, pre-lifting the counterweight 334 before installation, wherein the supporting force of the counterweight buffering elastic mechanism 335 on the counterweight 334 is smaller than the gravity, connecting the upper anchor cable 13 with the counterweight 334, and the anchor cable between the counterweight and the lifting locking device has certain tension, thereby completing the installation of the whole set of restraining device.
The above embodiments are only used for illustrating the present invention, and the structure, the arrangement position, the connection mode, and the like of each component can be changed, and all equivalent changes and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. A relative motion restraining device for a vertical swinging plate of a dry tree semi-submersible platform and a main hull comprises an X-shaped motion restraining anchor cable group, an anchor cable guiding and locking device and an energy buffering device;
the X-shaped motion suppression anchor cable group comprises 2 upper anchor cables and 2 lower anchor cables, and the 2 upper anchor cables and the 2 lower anchor cables are arranged between a droop swinging plate of the dry tree semi-submersible platform and a main hull in an X shape;
the anchor cable guiding and locking device is arranged on an upright post of the dry-tree semi-submersible platform and can apply pretension to the upper anchor cable and lock the upper anchor cable;
the lower anchor cable is connected with the drooping swing plate, the upper anchor cable is connected with the energy buffering device after being guided by the anchor cable guiding and locking device, and the energy buffering device can buffer the impact force generated by the X-shaped motion suppression anchor cable group due to the motion of the drooping swing plate;
and a set of relative motion inhibiting device is arranged on the outer side planes of every two adjacent stand columns on the dry tree semi-submersible platform.
2. The relative motion suppression apparatus according to claim 1, wherein: the cross-shaped intersections of the 2 upper anchor cables and the 2 lower anchor cables are connected through a cross-shaped connecting plate;
and 2, the lower anchor cables are connected to two sides of the drooping swing plate through a hanging point connecting structure.
3. The relative motion suppression apparatus according to claim 1 or 2, characterized in that: the anchor cable guiding and locking device comprises a first guide wheel arranged at the lower part of the upright column, a second guide wheel arranged at the upper part of the upright column and an anchor cable lifting and locking device;
the upper anchor cable is guided to the lifting locking device through the first guide wheel and then guided to the energy buffering device through the second guide wheel;
the lifting locking device utilizes a hydraulic cylinder or a mechanical device to exert pretension on the upper anchor cable and lock the upper anchor cable.
4. The relative motion suppression apparatus according to claim 3, wherein: the first guide wheel is arranged in the direction close to the central axis of the ship body and can swing left and right.
5. The relative motion suppression apparatus according to claim 4, wherein: the energy buffer device comprises an elastic support arranged at the top of the upright post and an energy buffer cabin arranged inside the upright post;
the lifting locking device is arranged on the elastic support;
and the upper anchor cable extends into the energy buffer cabin.
6. The relative motion suppression apparatus according to claim 5, wherein: the elastic support is arranged on the supporting structure;
the elastic support is flexibly supported by a spiral spring.
7. The relative motion suppression apparatus according to claim 6, wherein: an anchor cable guide inlet and an anchor cable guide outlet are formed in the upper part of the energy buffer cabin;
the inner cabin wall of the energy buffer cabin is provided with a slide rail;
a counterweight is arranged in the energy buffer cabin, and a buffer elastic mechanism is arranged at the lower part of the counterweight;
the upper anchor cable penetrates through the anchor cable guide inlet and then is connected with the counterweight, and the counterweight can move along the slide rail.
8. The relative motion suppression apparatus according to claim 7, wherein: the buffering elastic mechanism comprises a spiral spring and a damping energy absorption device arranged on the spiral spring.
9. The relative motion suppression apparatus according to claim 8, wherein: the upper anchor cable and the lower anchor cable are both anchor chains or steel wire ropes.
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