CN108820148B - Semi-submersible platform and lower floating body thereof - Google Patents
Semi-submersible platform and lower floating body thereof Download PDFInfo
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Abstract
The invention provides a semi-submersible platform and a lower floating body thereof. The lower floating body comprises two fore-aft sections and a middle section, and the two fore-aft sections are respectively connected with the two longitudinal ends of the middle section; the fore-aft section is of a structure with gradually reduced width from the middle part to the two ends in the longitudinal direction, the maximum width of the fore-aft section is smoothly transited to the outer end through a curved surface, and the outer contour line from the maximum width of the fore-aft section to the end part of the outer end is a semi-ellipse; the maximum width of the fore-aft section is in smooth transition connection with the middle section through an elliptical arc and at least one section of concave arc, the elliptical arc is connected with the semi-ellipse and is on the same ellipse, and the maximum width of the fore-aft section is the short axis of the ellipse; the maximum width of the middle section is less than that of the fore and aft sections. The lower floating body with a streamline structure is adopted, so that towing and self-navigating resistance of the semi-submersible platform can be reduced, fuel consumption of a platform host or a tug host can be reduced, and operation cost can be further reduced. Further, the present invention also improves platform heave performance.
Description
The invention is a divisional application of the Chinese patent application with the application date of 2015, 4 and 13, the application number of 2015101707387 and the name of 'semi-submersible platform and lower floating body thereof'; the application date is 2015, 2 months and 2 days, the application number is 201510053492.5, and the invention name is the Chinese patent application priority of the medium-deep water semi-submersible ocean platform.
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a floating offshore structure, and more particularly relates to a semi-submersible platform suitable for operation in medium and deep sea areas and a lower floating body thereof.
Background
As is well known, petroleum resources are a power source of modern industry, and with the gradual depletion of land petroleum resources, the exploration, development and utilization of marine oil and gas resources are rapidly developed in recent years, so that the demand of marine engineering quantity is vigorous, and particularly, marine engineering equipment products such as semi-submersible drilling platforms, semi-submersible marine life platforms, semi-submersible marine hoisting platforms and the like are pursued in various shipyards in the world along with the gradual trend of marine engineering from shallow water to medium and deep water, and the competition is strong.
For a common semi-submersible platform, a floating body (also called a buoy) is generally arranged on the port and the starboard of a lower hull respectively and used for providing all required buoyancy for the integral semi-submersible platform; the two lower floating bodies are arranged on the left side and the right side of the semi-submersible platform at a large interval, so that the rolling amplitude is prevented from being too large, and the overall stability of the semi-submersible platform is ensured; when the operation working condition or the storm-resistant self-existing working condition is adopted, the lower floating body is completely submerged in the seawater below the sea level, so that the integral buoyancy is provided for the semi-submersible platform, and the unfavorable problems of overlarge amplitude of wave disturbing force and the like are prevented. The transverse section of the common lower floating body is a rectangle with four circular arcs at four corners, so that the sailing resistance and the towing drag of the semi-submersible platform under the working condition of self-sailing (or towing sailing) are reduced, but the lower floating body in the shape has a space for improvement in the resistance and the heave motion performance.
Disclosure of Invention
The invention aims to provide a semi-submersible platform and a lower floating body thereof, and solves the problem that the semi-submersible platform in the prior art has overlarge resistance in the sailing working condition.
Further, the invention also improves the heave performance of the semi-submersible platform.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to one aspect of the invention, the invention provides a lower floating body of a semi-submersible platform, which comprises two fore-and-aft sections and a middle section, wherein the two fore-and-aft sections are respectively connected with the two longitudinal ends of the middle section; the fore-and-aft section is of a structure with gradually reduced width from the middle part to two ends in the longitudinal direction, the maximum width position of the fore-and-aft section is smoothly transited to the outer end through a curved surface, and the outer contour line from the maximum width position of the fore-and-aft section to the end part of the outer end is a semi-ellipse; the maximum width position of the fore-aft section is in smooth transition connection with the middle section through an elliptical arc and at least one section of concave arc, the elliptical arc is connected with the semi-ellipse and is on the same ellipse, and the maximum width of the fore-aft section is the short axis of the ellipse; the maximum width of the middle section is smaller than that of the fore and aft sections.
Preferably, the fore-and-aft section and the middle section are both symmetrical relative to the longitudinal axis of the fore-and-aft section, the fore-and-aft section is symmetrically arranged at two ends of the middle section, and the longitudinal axes of the fore-and-aft section and the middle section are overlapped.
Preferably, the intermediate section is of uniform width from one end to the other.
Preferably, the ratio of the width of the middle section to the maximum width of the fore-aft section is 0.60-0.75.
Preferably, the ratio of the width of the middle section to the maximum width of the fore-aft section is 0.62-0.7.
Preferably, the ratio of the axial length of the middle section to the axial length of the fore-aft section is 0.4-0.5.
Preferably, the ratio of the axial distance from the maximum width position of the fore-and-aft section to the joint of the fore-and-aft section and the middle section to the maximum width of the fore-and-aft section is 1.05-1.15.
Preferably, the ratio of the axial length to the maximum width of the fore-aft section is 2-2.2.
Preferably, the ratio of the distance from the maximum width position of the fore-aft section to the outer end part to the maximum width of the fore-aft section is 1-1.2.
According to another aspect of the invention there is also provided a semi-submersible platform comprising a lower float as described above.
According to the technical scheme, the invention has at least the following advantages and positive effects: in the invention, the bow and stern sections of the floating body under the semi-submersible platform are smoothly transited to the end part of the outer end and the middle section from the maximum width part in the longitudinal direction through the curved surface respectively, the outer contour line of the lower floating body is a smooth curve, the streamline structure is favorable for reducing the towing and self-navigation resistance of the semi-submersible platform, and the fuel consumption of a platform host machine or a tug host machine is reduced when the semi-submersible platform is under the working condition of self-navigation or towing navigation, thereby reducing the operation cost.
Furthermore, the central axes of the fore-aft section and the middle section of the lower floating body are overlapped, the lower floating body is symmetrical left and right, and for a semi-submersible platform adopting the lower floating body, the heaving motion amplitude response operator can be reduced, the heaving performance of the platform is further improved, so that the adverse problems of wave disturbance force, overlarge amplitude and the like are prevented, the operable sea area of the semi-submersible platform can be further expanded, the semi-submersible platform is completely suitable for each severe sea area, the reliable work of a vertical pipe connected with the semi-submersible platform can be still ensured under the more severe weather and sea condition, and the oil and gas drilling exploitation period and the operation cost are further reduced.
Drawings
FIG. 1 is a schematic side view of a preferred embodiment of the semi-submersible of the present invention.
FIG. 2 is a left side view of FIG. 1, showing the stern structure of the semi-submersible of the present invention.
Fig. 3 is a view a-a of fig. 1 of the present invention.
FIG. 4 is a schematic view of the arrangement of the lower hull inner compartments of the preferred embodiment of the semi-submersible of the present invention.
FIG. 5 is a schematic view of the arrangement of key tanks in the lower float in the preferred embodiment of the semi-submersible of the present invention.
Fig. 6 is a view B-B of fig. 1 of the present invention.
Fig. 7 is a schematic structural view of another preferred embodiment of the lower float of the present invention.
The reference numerals are explained below: 1. a lower float; 101. an outer plate; 11. a bow and stern section; 111. an outer end; 12. a middle section; 14. a cabin; 14a, a key liquid tank; 14b, a cabin; 141. a bulkhead plate; 141a, an inner shell plate; 141b, bulkhead plates; 2. a column; 201. a longitudinal outer plate; 202. a transverse outer plate; 21. round corners; 22. a protruding portion; 3. a main hull; 31. a port outer plate; 32. a starboard outer plate; 33. a main deck; 331. an extension portion; 34. an intermediate deck; 35. a lower deck; 4. a cross brace; 5. and (7) loading the cargo tank.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
The invention provides a semi-submersible platform suitable for operation in medium and deep water sea areas and a lower floating body thereof, wherein the semi-submersible platform can be used as a drilling platform for oil and gas exploitation, the working water depth of the platform is about 80-1500 m, and the variable load is about 5000-6000 tons. Preferably, the semi-submersible platform provided by the invention allows the temperature range of seawater to be 0-32 ℃ during operation, allows the temperature range of ambient air to be negative 7-positive 35 ℃, and can operate in the north sea of the United kingdom and other sea areas.
Unless otherwise stated, the longitudinal directions are referred to as the longitudinal direction of the semi-submersible platform, and correspondingly, the longitudinal ends of the semi-submersible platform are respectively called a fore part and a stern part; the "transverse direction" is referred to as the width direction of the semi-submersible platform, and correspondingly, two transverse sides of the semi-submersible platform are called a port side and a starboard side respectively. In addition, the length direction of the lower floating body is consistent with the length direction of the semi-submersible platform.
Referring to fig. 1 and 2, the semi-submersible platform of the present embodiment mainly includes two lower floats 1, four columns 2 vertically disposed on the lower floats 1, and a main hull 3 supported on the columns 2. The lower floating bodies 1 extend along the longitudinal direction, the two lower floating bodies 1 are symmetrically arranged on the port side and the starboard side, and the two lower floating bodies 1 are arranged in parallel at intervals. The lower ends of the four upright posts 2 are respectively arranged at the bow part and the stern part of the two lower floating bodies 1, a cross brace 4 is also connected between the two opposite upright posts 2 positioned on the port and the starboard, and the upper ends of the four upright posts 2 support the main ship body 3.
The main hull 3 is a square box structure, on which various functional devices are arranged according to actual needs. The columns 2 support the overall weight of the main hull 3. Under the working condition or the storm-resistant self-existing working condition, the lower floating body 1 is completely submerged in seawater below the sea level, and the main purpose of the lower floating body is to provide overall buoyancy for the semi-submersible platform and bear the environmental load, the working weight and the weight of an empty ship. The semi-submersible platform is provided with four propellers (not shown in the figure), the four propellers are respectively positioned at the bottoms of the bow part and the stern part of the two lower floating bodies 1, each propeller is a full-rotation propeller, and is matched with a power positioning system in a matching way, so that the pulling force is transmitted through a towing cable when the operation working condition is towed. The semi-submersible platform is provided with a small number of propellers, so that a matched control system is correspondingly simplified
Referring to fig. 1 and 3, the lower floating body 1 includes two fore-and-aft sections 11 and a middle section 12, the two fore-and-aft sections 11 are respectively used as the fore part and the aft part of the lower floating body 1, and the two fore-and-aft sections 11 are respectively connected to the two longitudinal ends of the middle section 12. The lower floating body 1 is a cylinder in the vertical direction, the upper surface and the lower surface of the lower floating body 1 are planes, the side surface of the lower floating body 1 is a vertical curved surface, and the upper surface and the lower surface are in fillet transition with the side surface respectively. As seen from the top view of the lower floating body 1 shown in fig. 3, the fore-aft section 11 has a structure with a gradually reduced width from the middle to the two ends in the longitudinal direction, and the outer contour line of the fore-aft section 11 is arc-shaped and is formed by multiple circular arcs or elliptical arcs. The maximum width of the fore-and-aft section 11 is smoothly transited to the outer end 111 through the curved surface, i.e. the end far away from the middle section 12, and the end of the outer end 111 also forms an arc surface, i.e. the two side surfaces of the fore-and-aft section 11 are transitionally connected at the end of the outer end 111 through the arc surface. The maximum width of the fore-and-aft section 11 is also in smooth transition connection with the middle section 12, and the maximum width of the middle section 12 is smaller than that of the fore-and-aft section 11.
Viewed from the longitudinal direction, the width of the lower floating body 1 is gradually increased from the end part of the cambered surface in a smooth transition mode, then the width is gradually decreased in a smooth transition mode, finally the width is gradually increased in a smooth transition mode, then the width is reduced in a smooth transition mode, and finally the cambered surface is formed at the other end part of the lower floating body. The lower floating body 1 integrally forms a bone-rod-shaped structure, the outer contour of the lower floating body 1 is streamline, the resistance coefficient increase caused by factors such as the sharp change of a corner streamline and the generation of vortex when a linear connection structure is adopted can be reduced, the fluid motion characteristic of fluid passing through the lower floating body 1 region is improved, the structure is favorable for reducing the towing and self-navigation resistance of a platform, and further the fuel consumption and the operation cost of a host are reduced.
Further, for a single lower floating body 1, a structural form of complete left-right symmetry is adopted, and the lower floating body 1 is symmetrical relative to the longitudinal center line and the transverse center line of the lower floating body. Namely: the fore-aft sections 11 and the middle section 12 are symmetrical relative to the longitudinal axis of the fore-aft sections, the two fore-aft sections 11 are symmetrically arranged at two ends of the middle section 12, and the longitudinal axes of the fore-aft sections 11 and the middle section 12 are overlapped. Therefore, the heave motion amplitude response operator can be reduced, so that the unfavorable problems of overlarge wave disturbance power amplitude and the like can be prevented, the heave motion response performance is further improved, meanwhile, the operable sea area of the semi-submersible platform adopting the lower floating body can be expanded, the semi-submersible platform is applicable to various severe sea areas, the reliable work of a riser connected with the semi-submersible platform can be still ensured under the more severe weather and sea condition conditions, and the oil and gas drilling exploitation period and the operation cost are further reduced.
In the lower float 1, the middle section 12 is of the same width from one end to the other end, i.e., the width W of the middle section 1212Constant, preferably, width W of intermediate section 1212Maximum width W of stem and stern section 1111The ratio of (A) is preferably 0.60 to 0.75, more preferably 0.62 to 0.7. In the structure with the proportion, the lower floating body can have a lower heave motion amplitude response operator, and the heave motion response performance of the semi-submersible platform is improved. By the width W of the intermediate section 1212Maximum width W of stem and stern section 1111For example, a ratio of 0.62, the vertical force has a 25% to 40% reduction in amplitude over a typical cycle, corresponding to heave motion, compared to a conventional floatThe response was a 20% to 35% reduction. In one embodiment, the maximum width W of the fore-aft section 111119m-21m, the width W of the middle section 1212Is 13m-15 m.
Length L of intermediate section 1212Axial length L of bow and stern section 1111The ratio of (A) is preferably 0.4 to 0.5, more preferably 0.45. Where "axial length" refers to the length along the longitudinal axis, the same applies below.
The axial distance L from the maximum width position of the fore-aft section 11 to the joint of the fore-aft section 11 and the middle section 12112Maximum width W of stem and stern section 1111The ratio of (A) is preferably 1.05 to 1.15, more preferably 1.1.
Axial length L of fore-aft section 1111And a maximum width W11The ratio of (A) is preferably 2 to 2.2, more preferably 2.1.
Distance L from maximum width position of bow and stern section 11 to end part of outer end 111111Maximum width W of stem and stern section 1111Preferably 1-1.2, L111The value of (B) is preferably from 20m to 25 m.
In the embodiment, as shown in fig. 3, the maximum width of the fore-aft section 11 is smoothly transited to the end of the outer end 111 by multiple circular arcs. The arcs are all convex arcs, preferably, the radius of each arc is gradually reduced from the maximum width of the fore-aft section 11 to the outer end 111. And the radius R of the circular arc surface at the end part of the outer end 111 of the fore-and-aft section 11111Maximum width W of stem and stern section 1111The ratio of (A) is preferably 0.2 to 0.3, more preferably 0.26. Radius R111The value of (d) may range around 5.2 m.
Similarly, as seen from fig. 3, the maximum width of the fore-aft section 11 and the middle section 12 are connected in sequence by a plurality of arcs to form a smooth transition of curved surface, the plurality of arcs includes at least two outward arcs and at least two inward arcs connected in sequence from the maximum width of the fore-aft section 11, the radius of each outward arc is gradually larger and the radius of each inward arc is gradually smaller in the direction from the maximum width of the fore-aft section 11 to the middle section 12. The radius of each arc preferably ranges from 20m to 51 m.
The structural form of the fore-and-aft section 11 enables the structural shape of each part of the lower floating body 1 to change smoothly, so that fluid has good movement characteristics when passing through.
The inner and outer directions of the convex arc and the concave arc are referenced to the lower floating body 1, the convex direction of the convex arc faces to the outer side of the lower floating body 1, and the convex direction of the concave arc faces to the inner side of the lower floating body 1.
In the invention, through the special design of the shape and the size parameters of each part of the lower floating body 1, the resistance coefficient of the lower floating body 1 can be controlled between 0.005 and 0.01, and compared with the common 0.015 to 0.024 in the prior art, the structure of the invention has obvious advantages.
Referring to fig. 4, a plurality of chambers 14 are partitioned in the lower floating body 1, and the chambers 14 are roughly divided into a propeller chamber, a ballast chamber, a pump chamber, a fresh water chamber, a brine chamber, a slurry chamber, a drilling water chamber and a fuel chamber according to functions, and the chambers 14 are partitioned by a bulkhead plate 141. Preferably, a double-deck housing is used to protect some of the critical tanks 14, which are labeled 14a for clarity, and the critical tanks 14a may include fresh water tanks, brine tanks, mud tanks, etc.
Specifically, as shown in fig. 5, the key tanks 14a have inner shell plates 141a spaced apart from the outer plates 101 of the lower float 1, and the inner shell plates 141a and the outer plates 101 of the lower float 1 together constitute a double-layered shell of the key tanks 14 a. The outer plate 101 of the lower floating body 1 is broadly referred to as each structural plate as the surface layer of the lower floating body 1. The profile structure (not shown) is arranged outside the inner shell plate 141a of each key liquid tank 14a, and the profile structure is not arranged in the key liquid tank 14 a. Through the protection of the double-layer shell, after the lower floating body 1 is damaged due to accidental collision, because a certain gap is formed between the inner shell plate 141a of the key liquid tanks 14a and the outer plate 101 of the lower floating body 1, the possibility of damage to the outer plate 101 and the inner shell plate 141a simultaneously is reduced, and the possibility of liquid leakage can be greatly reduced.
For the fresh water cabin, as the fresh water in the fresh water cabin is usually used for daily drinking and domestic water of operators on a platform, the cabin of the fresh water cabin which is not protected by double shells is provided with a profile structure, and as the fresh water cabin is coated with special requirements, the profile structure also needs to be coated, after the double-shell protection design is adopted, the fresh water cabin is provided with no profile structure, so that the coating area is correspondingly reduced, the working difficulty and the working load of coating operation are reduced, and meanwhile, the cabin is favorably cleaned without profiles. After the saline water cabin and the slurry cabin are provided with double-shell protection, the sectional materials are all positioned outside the shell plate in the liquid cabin, the probability of environmental pollution after leakage is reduced by using the double-shell protection design, the cleaning of the cabin is facilitated, and the building efficiency of ocean engineering is improved.
In the embodiment shown in fig. 4, four key liquid tanks 14a with double-layer shells are arranged in the lower floating body 1, the four key liquid tanks 14a are symmetrically distributed in the fore-aft section 11 of the lower floating body 1, and the four key liquid tanks 14a are close to the middle section 12 of the lower floating body 1.
Referring to fig. 1 to 3 together, the pillar 2 is a substantially rectangular column structure, and the cross section of the pillar 2 is a rectangle with rounded corners, the outer plates of the pillar 2 include two opposite longitudinal outer plates 201 and two opposite transverse outer plates 202, and the rounded corners 21 are disposed between the longitudinal outer plates 201 and the transverse outer plates 202. The lower end of the upright post 2 is arranged in the middle area of the bow and stern section 11 of the lower floating body 1, and the width W of the lower end of the upright post 22That is, the distance between the two longitudinal outer plates 201 of the upright post 2 is smaller than the width of the fore-aft section 11 at the area where the two longitudinal outer plates are located, that is: the upright post 2 and the lower floating body 1 adopt a non-aligned connection mode.
Further, the lower end of the column 2 is inserted into the lower floating body 1, and as shown in fig. 4, an independent cabin 14b is provided in the lower floating body 1 at a position corresponding to the installation position of the column 2, and a cabin wall plate 141b of the independent cabin 14b is integrally formed with the outer plates 201 and 202 of the column 2. Through the connection mode, a more complete and reasonable hull structure form is formed, so that the stress concentration at the joint of the upright post 2 serving as an important node of the hull structure of the platform and the lower floating body 1 is avoided, the problem of fatigue damage is solved relatively easily, and the safety of oil extraction operation of the platform under severe weather and sea conditions is improved.
As a preferred embodiment, the cargo tanks 5 carried by the semi-submersible may be arranged separately in each upright 2. The plurality of tanks 5 of the semi-submersible may be evenly distributed among the four columns 2 as shown in fig. 3, and as an example, 3 tanks 5 are arranged in each column 2 when the semi-submersible has a total of 12 tanks 5. For a drilling platform, large quantities of drilling material, such as barite, earth dust, cement, etc., often weighing more than one thousand tons in total, need to be carried by the cargo tanks 5. Arrange cargo tank 5 in stand 2, can make the inside spatial region of stand 2 obtain abundant utilization, avoid occupying comparatively nervous deck area, simultaneously for installing cargo tank 5 in the inside situation of deck face or main hull 3, the whole central height of platform has been reduced to this kind of arrangement mode, and is more favorable to improving the stability of platform.
Wherein, the top and bottom ends of the cargo tank 5 are respectively designed with a support structure (not shown in the figure), the support structure is connected with the outer plate 201 or the inner cabin wall of the upright post 2, and simultaneously the support structure bears the gravity generated by the cargo tank 5 in the vertical direction and the component force generated when the platform is rolled or pitched.
Referring to fig. 1 and 2, the upper end of the column 2 supports the main hull 3, and in this embodiment, the column 2 and the main hull 3 are also connected in a non-aligned manner. Referring to fig. 6, the distance W between the port and starboard side outer plates 31, 32 of the main hull 33Is smaller than the distance D between the outer side surfaces of the two columns 2 on the port and starboard sides, namely, the distance D between the longitudinal outer plates 201 on the outer sides of the two columns 2 on the port and starboard sides2So that the upper end of the column 2 has a projecting portion 22 projecting from the port side outer panel 31 or the starboard side outer panel 32 of the main hull 3. The left side portions of the two columns 2 on the port side project from a port side outer plate 31 of the main hull 3, and the right side portions of the two columns 2 on the starboard side project from a starboard side outer plate 32 of the main hull 3. The port side outer plate 31 and the starboard side outer plate 32 are outer plates on the left and right sides of the square box-shaped structure of the main hull 3, and the port side outer plate 31 and the starboard side outer plate 32 are vertically arranged and extend in the longitudinal direction.
For the square box type main ship body 3 with the same volume and size, in the embodiment, the relative distance between the upright posts 2 on the port and the starboard is larger than that of the semi-submersible platform in the prior art, so that the overall stability of the platform can be improved, the transverse inclination angle amplitude of the ship body is reduced under the same weather and sea condition, and meanwhile, the applicability of the platform to severe weather and sea condition is improved. In a preferred embodiment, the distance between the longitudinal axes of the two lower floating bodies 1 is 60m-66m, and the two lower floating bodies 1 have larger distance, so that the vertical columns 2 on the port and the starboard have relatively larger distance, and the stability of the platform is improved.
Further, referring to fig. 2, the protruding portion 22 of the upright post 2 protruding from the port side outer plate 31 or the starboard side outer plate 32 of the main hull 3 extends from bottom to top to the main deck 33 of the main hull 3, and is securely connected to the main hull 3 as a whole. The method that additional bracket plates and other hull parts are not needed to be added between the upright post 2 and the main hull 3 to prolong the anti-fatigue life of the connecting joint and improve the stress bearing performance. The main deck 33 of the main hull 3 is provided with four extensions 331 protruding from the port side outer panel 31 or the starboard side outer panel 32 of the main hull 3 corresponding to the protruding portions 22 of the respective columns 2, and each extension 331 covers the upper end of the protruding portion 22 of the corresponding column 2.
Preferably, anchoring means (not shown) are arranged on each of the four extensions 331 of the main deck 33, making full use of the area of the main deck 33 and, ideally, the structural advantage of the extensions 331 protruding from the main hull 3 on the port or starboard side.
The square box type structure of the main hull 3 provides the arrangement requirement of each functional device of the semi-submersible platform, and the main hull 3 is divided into a plurality of layers of spaces through a lower deck 35, an intermediate deck 34, a main deck 33 and other layers of decks which are horizontally arranged from bottom to top, so that the partitions of different functional cabins are realized. As shown in figure 1, the outer plates on the bow side and the stern side of the main hull 3 do not exceed the end part of the outer end 111 of the bow-stern section 11 of the lower floating body 1, so that the platform has better stability, and the outer plates on the bow side and the stern side are vertically arranged and transversely extend to form peripheral side plates of the main hull 3 together with the outer plates 31 on the port side and the outer plates 32 on the starboard side.
A derrick and drilling equipment are arranged in the middle of the main hull 3 for drilling operations.
Compared with the structure that the robot working platform is arranged on the port and the starboard of the main deck in the prior art, the arrangement structure can ensure that the underwater robot can still reliably work under the conditions of severe weather and sea conditions, and improves the economy of oil extraction operation.
The main deck 33 of the main hull 3 is provided with an upper building, so that an operator can live, work and perform auxiliary work in the main deck, and an emergency generator set is designed and arranged in a second deck area of the upper building to provide an emergency power supply for important electrical equipment.
A helicopter platform deck can also be arranged on the main deck 33 for taking off and landing of the helicopter to improve the supply, rescue and traffic capacity, and the helicopter platform deck can be built on an upper building.
One hoisting device can be arranged on each of the port and starboard sides of the main deck 33, so that the overall weight distribution is uniform under the working condition. The hoisting equipment comprises a crane and a base thereof, preferably, the crane is provided with a foldable suspension arm, so that the crane has a fully flexible operation space; after the crane stops working, for the very limited storage working space of the main deck 33, a part of space is saved by the foldable boom, so that a precondition is provided for the arrangement of other equipment, and the foldable boom has practical significance for solving the specific technical problems of the project.
The main deck 33 is further provided with a horizontal marine riser fixing frame and a pipe storage area for placing various pipe fittings.
Fig. 7 shows another structure of the lower floating body 1s in the semi-submersible platform of the present invention, in this embodiment, the outer contour of the fore-aft section 11s of the lower floating body 1s is a part of an ellipse. Specifically, the outer contour line from the maximum width of the fore-and-aft section 11s to the end of the outer end 111s is a semi-ellipse 112s, the maximum width of the fore-and-aft section 11s is transited to the middle section 12s through an elliptical arc 113s and at least one section of concave arc 114s, the elliptical arc 113s is connected with the semi-ellipse 112s and is on the same ellipse EL, and the other end of the elliptical arc 113s is connected with the middle section 12s through the concave arc 114 s. Maximum width W of fore-aft section 11s11sA distance L from the maximum width of the fore-aft section 11s to the end of the outer end 111s as the minor axis of the ellipse EL111sHalf the major axis of the ellipse EL. In the structure, the maximum width position of the fore-and-aft section 11s is also smoothly transited to the end part of the outer end 111s and the middle section 12s through the curved surface respectively to form a streamline bone rod-shaped structure, and simultaneouslyThe fore-aft section 11s is of a symmetrical structure. The lower float 1s of the present embodiment can also reduce the drag coefficient and improve the heave performance. The dimensional parameter relationship and other characteristics of each part of the lower floating body 1s in the embodiment can refer to the related characteristics of the lower floating body 1 of the first structure described above, and the other structural characteristics of the semi-submersible platform adopting the lower floating body 1s can also refer to the description above.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (7)
1. The utility model provides a lower body of semi-submerged platform which characterized in that:
the lower floating body comprises two fore-aft sections and a middle section, and the two fore-aft sections are respectively connected with the two longitudinal ends of the middle section; the fore-aft section and the middle section are symmetrical relative to the longitudinal axis of the fore-aft section, the fore-aft section is symmetrically arranged at two ends of the middle section, and the longitudinal axes of the fore-aft section and the middle section are superposed; the fore-and-aft section is of a structure with gradually reduced width from the middle part to two ends in the longitudinal direction, the maximum width position of the fore-and-aft section is smoothly transited to the outer end through a curved surface, and the outer contour line from the maximum width position of the fore-and-aft section to the end part of the outer end is a semi-ellipse; the maximum width position of the fore-aft section is in smooth transition connection with the middle section through an elliptical arc and at least one section of concave arc, the elliptical arc is connected with the semi-ellipse and is on the same ellipse, and the maximum width of the fore-aft section is the short axis of the ellipse; the maximum width of the middle section is smaller than that of the fore and aft sections, and the middle section is equal in width from one end to the other end; the ratio of the width of the middle section to the maximum width of the fore-aft section is 0.60-0.75.
2. The lower float of claim 1, wherein the ratio of the width of the intermediate section to the maximum width of the fore-aft section is 0.62-0.7.
3. The lower float of claim 1, wherein the ratio of the axial length of the intermediate section to the axial length of the fore-aft section is 0.4-0.5.
4. The lower floating body according to claim 1, wherein the ratio of the axial distance from the maximum width of the fore-aft section to the joint of the fore-aft section and the middle section to the maximum width of the fore-aft section is 1.05-1.15.
5. The lower float of claim 1, wherein the ratio of the axial length to the maximum width of the fore-aft section is 2-2.2.
6. The lower floating body according to claim 1, wherein the ratio of the distance from the outer end to the maximum width of the fore-aft section is 1-1.2.
7. Semi-submersible platform, characterized in that it comprises a lower float according to any of claims 1-6.
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| CN2015100534925 | 2015-02-02 | ||
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| CN201510170738.7A CN106143817B (en) | 2015-02-02 | 2015-04-13 | Semi-submerged platform and its lower floating body |
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| CN108820148A CN108820148A (en) | 2018-11-16 |
| CN108820148B true CN108820148B (en) | 2020-11-06 |
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| CN201520189045.8U Active CN204507207U (en) | 2015-02-02 | 2015-03-31 | Semi-submersible offshore platform and lower buoyancy aid thereof |
| CN201520205025.5U Active CN204527562U (en) | 2015-02-02 | 2015-04-07 | Semi-submersible offshore platform |
| CN201810644461.0A Active CN108820148B (en) | 2015-02-02 | 2015-04-13 | Semi-submersible platform and lower floating body thereof |
| CN201510170738.7A Active CN106143817B (en) | 2015-02-02 | 2015-04-13 | Semi-submerged platform and its lower floating body |
| CN201510170739.1A Active CN106143818B (en) | 2015-02-02 | 2015-04-13 | Middle deep water semi-submersible drilling platform |
| CN201520217852.6U Withdrawn - After Issue CN204527563U (en) | 2015-02-02 | 2015-04-13 | Middle deep water semi-submersible drilling platform |
| CN201520219724.5U Withdrawn - After Issue CN204527564U (en) | 2015-02-02 | 2015-04-13 | Semi-submerged platform and lower buoyancy aid thereof |
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| CN201520205025.5U Active CN204527562U (en) | 2015-02-02 | 2015-04-07 | Semi-submersible offshore platform |
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| CN201510170739.1A Active CN106143818B (en) | 2015-02-02 | 2015-04-13 | Middle deep water semi-submersible drilling platform |
| CN201520217852.6U Withdrawn - After Issue CN204527563U (en) | 2015-02-02 | 2015-04-13 | Middle deep water semi-submersible drilling platform |
| CN201520219724.5U Withdrawn - After Issue CN204527564U (en) | 2015-02-02 | 2015-04-13 | Semi-submerged platform and lower buoyancy aid thereof |
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| WO2016124011A1 (en) * | 2015-02-02 | 2016-08-11 | 中集海洋工程研究院有限公司 | Middle depth water semi-submersible type drilling platform |
| CN204527559U (en) * | 2015-02-02 | 2015-08-05 | 中集海洋工程研究院有限公司 | Semi-submersible offshore platform |
| CN106516025B (en) * | 2015-09-10 | 2021-10-08 | 中集海洋工程研究院有限公司 | Semi-submersible living platform |
| CN105151236B (en) * | 2015-09-28 | 2017-07-21 | 大连理工大学 | Floating pier and tower snorkeling movement carrying platform device and its method of work |
| CN105480378A (en) * | 2015-11-23 | 2016-04-13 | 中国海洋石油总公司 | Equipment maintenance method during drilling platform building process |
| CN106915420B (en) * | 2015-12-28 | 2019-02-15 | 中国国际海运集装箱(集团)股份有限公司 | Offshore equipment and its transverse brace structure |
| CN106364633A (en) * | 2016-08-30 | 2017-02-01 | 上海交通大学 | Semi-submersible type ocean platform and implementation method of optimized heaving effect of semi-submersible type ocean platform |
| CN109110046A (en) * | 2017-06-22 | 2019-01-01 | 天津海之星船艇科技有限公司 | A kind of binary guarantee ship with first device partly latent |
| TWI624406B (en) * | 2017-08-14 | 2018-05-21 | Semi-submersible support platform and positioning method thereof | |
| CN107512363A (en) * | 2017-08-29 | 2017-12-26 | 广船国际有限公司 | A kind of mammoth tanker and its safety protecting method |
| CN109835442A (en) * | 2017-11-24 | 2019-06-04 | 烟台中集来福士海洋工程有限公司 | Ultra-deep-water semisubmersible drilling platform |
| CN107792303B (en) * | 2017-11-28 | 2024-04-05 | 鲁东大学 | Semi-submersible type ocean hoisting platform and operation method thereof |
| CN112319733B (en) * | 2020-12-18 | 2023-05-16 | 上海振华重工启东海洋工程股份有限公司 | Lower floating body segmentation dividing method |
| CN112706880A (en) * | 2021-02-05 | 2021-04-27 | 北京南风科创应用技术有限公司 | Semi-submersible unmanned self-defense power buoy |
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| JPH10230897A (en) * | 1997-02-21 | 1998-09-02 | Mitsubishi Heavy Ind Ltd | Semi-submersible floating body provided with vertically moving-type underwater observation chamber |
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| CN101219705A (en) * | 2008-01-14 | 2008-07-16 | 中国海洋石油总公司 | Semi-submersible drilling platform |
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| CN202574575U (en) * | 2012-04-24 | 2012-12-05 | 烟台中集来福士海洋工程有限公司 | Semi-submersible platform |
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- 2015-03-26 CN CN201520173730.1U patent/CN204527559U/en active Active
- 2015-03-31 CN CN201520189045.8U patent/CN204507207U/en active Active
- 2015-04-07 CN CN201520205025.5U patent/CN204527562U/en active Active
- 2015-04-13 CN CN201810644461.0A patent/CN108820148B/en active Active
- 2015-04-13 CN CN201510170738.7A patent/CN106143817B/en active Active
- 2015-04-13 CN CN201510170739.1A patent/CN106143818B/en active Active
- 2015-04-13 CN CN201520217852.6U patent/CN204527563U/en not_active Withdrawn - After Issue
- 2015-04-13 CN CN201520219724.5U patent/CN204527564U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201816730U (en) * | 2010-09-13 | 2011-05-04 | 上海利策科技有限公司 | Low-heaving semi-submersible type platform hull |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106143818A (en) | 2016-11-23 |
| CN108820148A (en) | 2018-11-16 |
| CN106143818B (en) | 2018-09-11 |
| CN204527562U (en) | 2015-08-05 |
| CN204527559U (en) | 2015-08-05 |
| CN106143817A (en) | 2016-11-23 |
| CN204507207U (en) | 2015-07-29 |
| CN106143817B (en) | 2018-09-18 |
| CN204527564U (en) | 2015-08-05 |
| CN204527563U (en) | 2015-08-05 |
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