WO2013163877A1 - 基于半潜驳建造的圆筒型深海钻井平台底层分段划分方法 - Google Patents

基于半潜驳建造的圆筒型深海钻井平台底层分段划分方法 Download PDF

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WO2013163877A1
WO2013163877A1 PCT/CN2012/085924 CN2012085924W WO2013163877A1 WO 2013163877 A1 WO2013163877 A1 WO 2013163877A1 CN 2012085924 W CN2012085924 W CN 2012085924W WO 2013163877 A1 WO2013163877 A1 WO 2013163877A1
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segment
projected area
cylindrical
oil storage
semi
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PCT/CN2012/085924
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English (en)
French (fr)
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张永康
王飞
倪涛
庄建军
屠艳
王匀
许桢英
张朝阳
江本帅
邱俊斌
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江苏大学
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Publication of WO2013163877A1 publication Critical patent/WO2013163877A1/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B73/00Building or assembling vessels or marine structures, e.g. hulls or offshore platforms

Definitions

  • the invention relates to the field of marine engineering equipment, and particularly relates to a method for dividing the bottom layer of a cylindrical deep sea drilling oil storage platform based on semi-submersible construction.
  • the cylindrical deep-sea drilling oil storage platform is typically SEVAN Driller, which is produced by Nantong COSCO Shipyard Co., Ltd., which is manufactured by "layered manufacturing, layer by layer” method.
  • SEVAN Driller which is produced by Nantong COSCO Shipyard Co., Ltd., which is manufactured by "layered manufacturing, layer by layer” method.
  • each segment is prefabricated, and then the segments are lifted onto the semi-submersible bar, and then the segments are welded into a single unit, thus forming the bottom layer of the drilling platform.
  • the semi-submersible barge was removed, and the bottom layer was used as a manufacturing platform to complete the construction of the entire drilling platform.
  • the technical problem to be solved by the present invention is to solve the actual demand for constructing a bottom layer of a cylindrical drilling oil storage platform on a semi-submersible bar by providing a bottom-stage segmentation method for a cylindrical deep-sea drilling oil storage platform based on semi-submersible construction.
  • the bottom layer of the cylindrical deep-sea drilling oil storage platform is a hollow cylinder with an inner diameter of ⁇ ani and an outer diameter of r.
  • the middle hollow area of the bottom layer of the cylindrical deep-sea drilling oil storage platform is a cylindrical drilling oil space, and the cylindrical drilling oil space radius As /;
  • the bottom layer of the cylindrical deep-sea drilling oil storage platform is symmetrically equal to N fan-shaped columns in the circumferential direction from top to bottom, N is an integer; the radius of the trailing edge sector column is from Each sector column is divided into M quadrilateral columns from top to bottom, n is an integer, and the division standard is that each quadrilateral column has the same projected area from top to bottom; the above-mentioned one quadrangular column is the bottom layer of the cylindrical deep sea drilling oil storage platform.
  • the bottom of the cylindrical deep-sea drilling oil storage platform is viewed from the top, in the circumferential direction it is It consists of a hollow polygonal column.
  • W is recorded as the number of segments divided.
  • w hollow polygonal columns are recorded as the first, 2, respectively. , 3... w circle; there are N segments in each hollow polygonal column, and N is recorded as the number of segments in each circle.
  • the object of the present invention is achieved by the following technical solutions:
  • the method for dividing the bottom layer of the cylindrical deep sea drilling oil storage platform based on the semi-submersible construction includes the following steps:
  • C. Determine the mass p of the projected area of the segment unit.
  • the internal structure of the bottom section of the cylindrical drilling oil storage platform is determined; the segmentation of the internal structure is trial-produced according to the classification society standard, and the trial production segment is used Obtain the quality of the projected area of the segment unit.
  • the specific method is as follows: Use the gantry crane to put the trial section into the water, record the distance between the water surface and the bottom of the trial section, and combine the projected area of the trial section to obtain the drainage of the trial section.
  • the unit is t / m 2 ; due to different projection area size
  • the segments have the same internal structure, so the quality of the projected area of the bottom unit of the cylindrical drilling platform is equal to p, and the unit is / m 2 , then the mass of each segment is pS, where ⁇ is the segment of each segment. shadow area.
  • the principle of the weight of the factory gantry crane is to determine the number of segments in each circle of the bottom layer, which is expressed as follows: ⁇ ⁇ tt, the relationship from the step C can be known as the quality of the segment, in the relationship from step B It can be seen that the maximum lifting capacity of the gantry crane can be obtained from the relationship, and the maximum projected area S of the segment can be obtained, and the number of segments N per segment of the bottom layer is finally determined by combining the determined projected area per circle of the segment.
  • N is an integer. Since S is the largest value, the resulting N is the minimum value.
  • the present invention divides the number of turns M and the minimum number of segments N per circle in the bottom layer by the minimum bottom layer segment, so that the total number of bottom layer segments / iN is minimized, thereby reducing the total number of lifting times of the segment and improving The bottom section construction efficiency of the cylindrical deep sea drilling oil storage platform.
  • the segments divided by the invention are all straight seam welds, the construction speed of the workers is fast, the deformation of the weld seams is easy to control, and special welding equipment is not required compared to the arc welds, thereby improving the economic efficiency of the factory.
  • Figure 1 is a schematic diagram of the bottom layer of a cylindrical deep-sea drilling oil storage platform.
  • Figure 2 is a schematic diagram of the underlying segmentation method of a cylindrical deep-sea drilling oil storage platform based on semi-submersible construction. Detailed ways
  • the bottom layer of the cylindrical deep-sea drilling oil storage platform is hollow cylindrical (see Figure 1), with an inner diameter of ⁇ and an outer diameter of r; the middle hollow area of the bottom layer of the cylindrical deep-sea drilling oil storage platform is a cylindrical drilling oil space, the cylindrical The drilling oil space radius is ⁇ .
  • the bottom layer of the cylindrical deep-sea drilling oil storage platform is divided (see Figure 2), the bottom layer of the cylindrical deep-sea drilling oil storage platform is symmetrically equal to N fan-shaped columns in the circumferential direction from top to bottom, N is an integer; The direction of the column radius divides each sector column into w quadrilateral columns from top to bottom. n is an integer. The standard of division is that each quadrilateral column has the same projected area from top to bottom; the above-mentioned one quadrangular column is a cylindrical deep sea drilling.
  • a section of the bottom layer of the oil storage platform shows that the total number of bottom sections of the cylindrical deep-sea drilling oil storage platform is N, and the projected area is recorded as a segmented projected area S, and the cylindrical deep-sea drilling reserve is viewed from the top down.
  • the bottom layer of the cylindrical deep-sea drilling oil storage platform is viewed from the top.
  • it is composed of a hollow polygonal column, and there are a total of w from the inside to the outside. Recorded as the number of laps divided into segments, w w hollow polygon columns from the inside to the outside are recorded as the first, 2, 3, ... w circle of the segment; each hollow polygonal column has N segments, N will be recorded The number of segments in each circle.
  • the invention is described in detail by taking the bottom layer of the Sevan Driller deep sea drilling oil storage platform constructed by Nantong COSCO Shipyard Co., Ltd. as an example.
  • the bottom layer segmentation method of a cylindrical deep sea drilling oil storage platform based on semi-submersible construction includes the following steps:
  • C Determine the mass of the projected area of the segment unit.
  • the internal structure of the bottom section of the cylindrical drilling oil storage platform is determined; the segmentation of the internal structure is trial-produced according to the classification society standard, and the trial production segment is used Obtain the quality of the projected area of the segment unit.
  • the specific method is as follows: Use the gantry crane to put the trial section into the water, record the distance between the water surface and the bottom of the trial section, and combine the projected area of the trial section to obtain the drainage of the trial section.
  • the drilling oil device can drill the oil space through the cylinder from top to bottom, the radius of the cylindrical drilling oil space is determined to be 12.5m;
  • E. Determine the number of laps M, M of the underlying segmentation is an integer.
  • the maximum projected area of the first lap of the segment is determined first, and the principle of whether the first lap of the segment can be built on the semi-submersible
  • a « + r/ ⁇ r which means that the segmented circle can be applied on the deck of the semi-submersible bar.
  • the segment of the segment is half The width direction of the submersible exceeds the deck of the semi-submersible bar.
  • the section of the sub-circle is beyond the semi-submersible deck and cannot be constructed.
  • N 16 obtained in combination with step F.

Abstract

公开了一种基于半潜驳建造的圆筒型深海钻井平台底层分段划分方法。该方法包含如下步骤:从上向下将圆筒型深海钻井平台底层沿圆周方向对称均分为N个扇形柱,N为整数;沿扇形柱半径的方向从上往下将每个扇形柱划分为n个四边形柱,n为整数,划分标准是每个四边形柱从上往下的投影面积相同;上述一个四边形柱就是圆筒型深海钻井平台底层的一个分段。该分段划分方法使底层总的分段数量nN最小,降低分段吊运次数,提高了圆筒型深海钻井平台底层分段建造效率;分段都是直线焊缝,工人施工速度快,焊缝的变形容易控制,相比于弧形焊缝无需专用焊接设备,提高了工厂的经济效益。

Description

基于半潜驳建造的圆筒型深海钻井平台底层分段划分方法 所属领域
本发明涉及海洋工程装备领域, 特指基于半潜驳建造的圆筒型深海钻井储油平台底 层分段划分方法。
技术背景
圆筒型深海钻井储油平台, 典型是如南通中远船务有限公司生产的 SEVAN Driller, 它采用 "分层制造, 逐层叠加" 的方法进行制造。 该类型钻井平台底层在制造时, 先预 制各分段, 再将各分段吊运到半潜驳上, 然后将各分段焊接成一个整体, 这样形成了钻 井平台的底层。 移去半潜驳, 以底层为制造平台, 完成整个钻井平台的建造。
该平台底层分段在划分时, 由于其建造平台是半潜驳, 需要综合考虑半潜驳宽度、 制造工厂门式起重机单次最大起重量、 圆柱形钻探石油空间和分段单位投影面积的质量 等实际约束, 查阅文献专利无类似分段划分方法, 需定制专门分段划分方法才能满足在 半潜驳上建造圆筒型深海钻井储油平台底层的实际需求。
发明内容
本发明所要解决的技术问题是通过提供基于半潜驳建造的圆筒型深海钻井储油平台 底层分段划分方法, 解决在半潜驳上建造圆筒型钻井储油平台底层的实际需求。
圆筒型深海钻井储油平台底层是空心圆柱体, 内径为 ζ„, 外径为 r ; 圆筒型深海钻 井储油平台底层中间空心区域是圆柱形钻探石油空间,该圆柱形钻探石油空间半径为/;„, 当圆筒型深海钻井储油平台建造完成后, 钻探石油装置从上往下通过该区域, 进入海底 钻探石油。
圆筒型深海钻井储油平台底层划分时, 先从上往下将圆筒型深海钻井储油平台底层 沿圆周方向对称均等为 N个扇形柱, N为整数; 后沿扇形柱半径的方向从上往下将每个 扇形柱划分为 M个四边形柱, n为整数,划分标准是每个四边形柱从上往下的投影面积相 同; 上述一个四边形柱就是圆筒型深海钻井储油平台底层的一个分段, 可知圆筒型深海 钻井储油平台底层分段总数为 N, 并将上述投影面积记为分段的投影面积 ^, 从上往下 看圆筒型深海钻井储油平台底层时, 可得出关系式《A¾ + ^„2 = rr2 ; 圆筒型深海钻井储 油平台底层每个分段都是直线焊缝。
在这种划分方式下, 从上往下看圆筒型深海钻井储油平台底层, 在圆周方向它是由 一个套着一个的空心多边形柱组成, 从内往外数一共有 W个, 将 W记为分段划分的圈数, 从内往外将 w个空心多边形柱分别记为分段的第 1, 2, 3…… w圈; 每个空心多边形柱 内有 N个分段, 将 N记为每圈内分段的个数。
本发明的目的通过以下技术方案来实现: 基于半潜驳建造的圆筒型深海钻井储油平 台底层分段划分方法, 包含以下步骤:
A、 使用激光测距仪测量半潜驳宽度为 α, 单位为 m ;
B、 根据工厂门式起重机操作规程确定门式起重机的起重系数 fc, 则门式起重机单次 最大起重量为 , 其中 L是门式起重机的额定起重量, 单位为 ;
C、 确定分段单位投影面积的质量 p。 按照圆筒型深海钻井储油平台所入船级社规 范, 确定圆筒型钻井储油平台底层分段的内部结构; 按照船级社规范试制该内部 结构的分段, 该试制分段用来获得分段单位投影面积的质量, 具体方法是: 使用 门式起重机将该试制分段放入水中, 记录水面与试制分段底部的距离, 结合试制 分段的投影面积得出试制分段的排水体积,排水体积与水的密度相乘得出试制分 段的质量, 进一步结合试制分段的投影面积得出试制分段单位投影面积的质量 p , 单位为 t / m2 ; 由于不同投影面积大小的分段拥有相同的内部结构, 所以圆 筒型钻井平台底层分段单位投影面积的质量等于 p, 单位为 / m2, 则每个分段 的质量为 pS, 其中 ^为每个分段的投影面积。
D、 按照钻探石油装置从上往下能够通过圆柱形钻探石油空间的原则,确定圆柱形钻 探石油空间的半径
E、 确定底层分段划分的圈数 M, M为整数。按照分段的第 1圈能否在半潜驳上建造的 原则, 先确定分段第 1圈的最大投影面积 Λ^, 其中分段的第 1圈能否在半潜驳上 建造的原则表现为如下关系: Λ¾ + τ ≤ Γ , 该式说明在半潜驳的甲板上能 够对分段第]圈进行施工, 当关系式中前者大于后者时, 分段的第]圈在半潜驳的 宽度方向超出了半潜驳的甲板, 由于工人和施工设备工作时必须依靠半潜驳甲 板, 导致了分段第]圈超出半潜驳甲板部分无法施工。 确定分段第 1圈最大投影面 积 后, 由于分段每圈的投影面积相同, 通过关系式《^ + ^„2 = ^2可以得出 分段划分的圈数 M, M为整数, 式中/ "是圆筒型钻井储油平台底层的外径, 船东 在订单中会告知圆筒型钻井平台底层的外径, 由于 Λ¾最是大值,得出的 Μ是最小 值。
F、 确定底层每圈内分段的个数 N, N为整数。 按照步骤 E中获得的底层分段划分 的圈数《, 结合《^ + ^„2 = ^2得出此时分段每圈的投影面积 Λ^ ; 按照分段单 次吊运时最大化使用工厂门式起重机起重量原则, 确定底层每圈内分段的个数 Ν , 具体表现为如下关系 ^≤tt, 关系式中 ^从步骤 C可知为分段的质量, 关系式中 从步骤 B中可知为门式起重机最大起重量, 从关系式中可以得出分 段最大的投影面积 S, 结合已经确定的分段每圈投影面积 Λ«, 最终确定底层每 圈内分段的个数 N, N为整数, 由于 S最是大值, 得出的 N是最小值。
G、 按照关系式《^ + ^„2 = ^2, 结合步骤 E得出的《和步骤 F得出的 N, 计算出 分段的投影面积 。
H、 对圆筒型深海钻井储油平台底层分段进行划分。结合步骤 F得出的 N,从上往下 将圆筒型深海钻井储油平台底层沿圆周方向对称均等为 N个扇形柱;结合步骤 E 得出的 M, 沿扇形柱半径的方向从上往下将每个扇形柱划分为 M个四边形柱, 划 分标准是每个四边形柱从上往下的投影面积等于步骤 G得出的 S; 上述一个四边 形柱就是圆筒型深海钻井储油平台底层的一个分段, 可知分段都是直线焊缝, 圆 筒型深海钻井储油平台底层分段划分结束。
本发明的有益效果是:
( 1 )本发明通过最小的底层分段划分圈数 M和最小的底层每圈内分段个数 N, 使底 层分段总的数量/ iN最小, 进而降低分段总的吊运次数, 提高了圆筒型深海钻井储油平台 底层分段建造效率。
( 2 ) 本发明划分出的分段都是直线焊缝, 工人施工速度快, 焊缝的变形容易控制, 相比于弧形焊缝无需专用焊接设备, 提高了工厂的经济效益。
附图说明
图 1是圆筒型深海钻井储油平台底层示意图。
图 2是基于半潜驳建造的圆筒型深海钻井储油平台底层分段划分方法示意图。 具体实施方式
圆筒型深海钻井储油平台底层是空心圆柱形 (见图 1 ), 内径为 ^, 外径为 r ; 圆筒 型深海钻井储油平台底层中间空心区域是圆柱形钻探石油空间, 该圆柱形钻探石油空间 半径为 ^, 当圆筒型深海钻进储油平台建造完成后, 钻探石油装置从上往下通过该区域, 进入海底钻探石油。
圆筒型深海钻井储油平台底层划分时 (见图 2), 先从上往下将圆筒型深海钻井储油 平台底层沿圆周方向对称均等为 N个扇形柱, N为整数; 后沿扇形柱半径的方向从上往 下将每个扇形柱划分为 w个四边形柱, n为整数,划分标准是每个四边形柱从上往下的投 影面积相同; 上述一个四边形柱就是圆筒型深海钻井储油平台底层的一个分段, 可知圆 筒型深海钻井储油平台底层分段总数为 N, 并将上述投影面积记为分段的投影面积 S, 从上往下看圆筒型深海钻井储油平台底层时, 可得出关系式《^ + ^„2 = ^2 ; 圆筒型深 海钻井储油平台底层每个分段都是直线焊缝。
在这种划分方式下, 从上往下看圆筒型深海钻井储油平台底层, 在圆周方向它是由 一个套着一个的空心多边形柱组成, 从内往外数一共有 w个, 将 w记为分段划分的圈数, 从内往外将 w个空心多边形柱分别记为分段的第 1, 2, 3…… w圈; 每个空心多边形柱 内有 N个分段, 将 N记为每圈内分段的个数。
以南通中远船务有限公司建造的 Sevan Driller深海钻进储油平台底层为实施例, 对 本发明进行详细说明。 基于半潜驳建造的圆筒型深海钻井储油平台底层分段划分方法, 包含以下步骤:
A、 使用激光测距仪测量半潜驳宽度为 a = 59.8m;
B、 根据工厂门式起重机操作规程确定门式起重机的起重系数 fc = 0.725,门式起重机 的额定起重量 ^ = 100 , 则门式起重机单次最大起重量为 ;
C 确定分段单位投影面积的质量 7。 按照圆筒型深海钻井储油平台所入船级社规 范, 确定圆筒型钻井储油平台底层分段的内部结构; 按照船级社规范试制该内部 结构的分段, 该试制分段用来获得分段单位投影面积的质量, 具体方法是: 使用 门式起重机将该试制分段放入水中, 记录水面与试制分段底部的距离, 结合试制 分段的投影面积得出试制分段的排水体积,排水体积与水的密度相乘得出试制分 段的质量, 进一步结合试制分段的投影面积得出试制分段单位投影面积的质量 p = 0.66S6t/m2-, 由于不同投影面积大小的分段拥有相同的内部结构, 所以圆筒 型钻井平台底层分段单位投影面积的质量等于 = 0.6686 /m2, 则每个分段的质 量为 S, 其中 S为每个分段的投影面积。
D、 按照钻探石油装置从上往下能够通过圆柱形钻探石油空间的原则,确定圆柱形钻 探石油空间的半径 = 12.5m;
E、 确定底层分段划分的圈数 M, M为整数。按照分段的第 1圈能否在半潜驳上建造的 原则, 先确定分段第 1圈的最大投影面积 Λ^, 其中分段的第 1圈能否在半潜驳上 建造的原则表现为如下关系: A« + r/ ≤ r , 该式说明在半潜驳的甲板上能 够对分段第]圈进行施工, 当关系式中前者大于后者时, 分段的第]圈在半潜驳的 宽度方向超出了半潜驳的甲板, 由于工人和施工设备工作时必须依靠半潜驳甲 板, 导致了分段第]圈超出半潜驳甲板部分无法施工。 确定分段第 1圈最大投影面 积^后, 由于分段每圈的投影面积相同, 通过关系式《^ + ^„2= ^2可以得出 分段划分的圈数 = 3, 式中 r = 42.5m, 由于 Λ¾最是大值, 得出的 是最小值。
F、 确定底层每圈内分段的个数 N, N为整数。 按照步骤 E中获得的底层分段划分 的圈数《, 结合《^+ ^„2= ^2得出此时分段每圈的投影面积 Λ^; 按照分段单 次吊运时最大化使用工厂门式起重机起重量原则, 确定底层每圈内分段的个数 Ν , 具体表现为如下关系 ^≤tt, 关系式中 ^从步骤 C可知为分段的质量, 关系式中 从步骤 B中可知为门式起重机最大起重量, 从关系式中可以得出分 段最大的投影面积 S, 结合已经确定的分段每圈投影面积 Λ«, 最终确定底层每 圈内分段的个数 N = 16, 由于 S最是大值, 得出的 N是最小值。
G、 按照关系式《^+ ^„2 = ^2, 结合步骤 E得出的《和步骤 F得出的 N, 计算出 分段的投影面积 S = 107.94m2
H、 对圆筒型深海钻井储油平台底层分段进行划分。结合步骤 F得出的 N = 16, 从上 往下将圆筒型深海钻井储油平台底层沿圆周方向对称均等为 16个扇形柱;结合步 骤 E得出的 M = 3,沿扇形柱半径的方向从上往下将每个扇形柱划分为 3个四边形 柱, 划分标准是每个四边形柱从上往下的投影面积等于步骤 G 得出的 5 = 107.94m2;上述一个四边形柱就是圆筒型深海钻井储油平台底层的一个分段, 圆筒型深海钻井储油平台底层分段划分结束。

Claims

权利要求书
1、 一种半潜驳建造圆筒型深海钻井平台底层的分段划分方法, 其特征在于, 包含如 下步骤:
A、 使用激光测距仪测量半潜驳宽度为 α, 单位为 m ;
B、 根据工厂门式起重机操作规程确定门式起重机的起重系数 fc, 则门式起重机单次 最大起重量为 tt, 其中 L是门式起重机的额定起重量, 单位为 ;
C、 确定分段单位投影面积的质量 按照圆筒型深海钻井储油平台所入船级社规 范, 确定圆筒型钻井储油平台底层分段的内部结构; 按照船级社规范试制该内部 结构的分段, 该试制分段用来获得分段单位投影面积的质量, 具体方法是: 使用 门式起重机将该试制分段放入水中, 记录水面与试制分段底部的距离, 结合试制 分段的投影面积得出试制分段的排水体积, 排水体积与水的密度相乘得出试制分 段的质量, 进一步结合试制分段的投影面积得出试制分段单位投影面积的质量 p , 单位为 t / m2 ; 由于不同投影面积大小的分段拥有相同的内部结构, 所以圆筒 型钻井平台底层分段单位投影面积的质量等于 p, 单位为 / m2, 则每个分段的质 量为 pS, 其中 S为每个分段的投影面积;
D、 按照钻探石油装置从上往下能够通过圆柱形钻探石油空间的原则, 确定圆柱形钻 探石油空间的半径
E、 确定底层分段划分的圈数/ ί, w为整数; 按照分段的第 1圈能否在半潜驳上建造的 原则, 先确定分段第 1圈的最大投影面积 Λ^, 其中分段的第 1圈能否在半潜驳上 建造的原则表现为如下关系: + n;„2≤ r , 该式说明在半潜驳的甲板上能 够对分段第]圈进行施工; 确定分段第 1圈最大投影面积^后, 由于分段每圈的投 影面积相同, 通过关系式/ ^^ + ^„2 = ^2可以得出分段划分的圈数 /7, n为整 数, 式中/ "是圆筒型钻井储油平台底层的外径, 船东在订单中会告知圆筒型钻井 平台底层的外径, 由于 最是大值, 得出的 w是最小值;
F、 确定底层每圈内分段的个数 N, JV为整数; 按照步骤 E中获得的底层分段划分的 圈数《, 结合《^ + ^„2 = ^2得出此时分段每圈的投影面积 Λ^ ; 按照分段单次 吊运时最大化使用工厂门式起重机起重量原则, 确定底层每圈内分段的个数 N, 具体表现为如下关系 ^≤ , 关系式中 ^从步骤 C可知为分段的质量, 关系式 中 从步骤 B 中可知为门式起重机最大起重量, 从关系式中可以得出分段最大 的投影面积 S, 结合已经确定的分段每圈投影面积 Λ«, 最终确定底层每圈内分段 的个数 N, JV为整数, 由于 S最是大值, 得出的 N是最小值;
G、 按照关系式《^ + ^„2 = ^2, 结合步骤 E得出的《和步骤 F得出的 N, 计算出分 段的投影面积
H、 对圆筒型深海钻井储油平台底层分段进行划分; 结合步骤 F得出的 N, 从上往下 将圆筒型深海钻井储油平台底层沿圆周方向对称均等为 N个扇形柱; 结合步骤 E 得出的 w, 沿扇形柱半径的方向从上往下将每个扇形柱划分为 w个四边形柱, 划 分标准是每个四边形柱从上往下的投影面积等于步骤 G得出的 上述一个四边 形柱就是圆筒型深海钻井储油平台底层的一个分段, 可知分段都是直线焊缝, 圆 筒型深海钻井储油平台底层分段划分结束。
PCT/CN2012/085924 2012-05-02 2012-12-05 基于半潜驳建造的圆筒型深海钻井平台底层分段划分方法 WO2013163877A1 (zh)

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