KR101669260B1 - Structure and method for leg structure installation of self-elevating unit using float over - Google Patents

Structure and method for leg structure installation of self-elevating unit using float over Download PDF

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Publication number
KR101669260B1
KR101669260B1 KR1020150055193A KR20150055193A KR101669260B1 KR 101669260 B1 KR101669260 B1 KR 101669260B1 KR 1020150055193 A KR1020150055193 A KR 1020150055193A KR 20150055193 A KR20150055193 A KR 20150055193A KR 101669260 B1 KR101669260 B1 KR 101669260B1
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South Korea
Prior art keywords
leg
legs
main body
sea
pants
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KR1020150055193A
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Korean (ko)
Inventor
서용진
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대우조선해양 주식회사
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    • B63B9/065—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B63B2009/067—

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The present invention relates to a leg structure installation structure of a self-elevating drillship using a float-over method and a method thereof, which can reduce material costs and construction schedule by being able to move an installation time of the leg structure which has been done in a construction step to a time after transportation of the self-elevating drillship, by applying the float-over method, which has been applied to offshore installation of a large size platform upper structure, to the leg structure installation of the self-elevating drillship. The leg structure installation structure of the present invention includes: a barge for designating a location of a leg while being installed on the sea; a mooring line connecting the barge to the leg; and a main body of the self-elevating drillship to install the leg on the sea by the float-over method while being installed on the sea at an upper part of the leg. The leg structure installation method of the present invention includes the steps of: connecting the barge and the leg by the mooring line while the barge to hold the leg is installed on the sea; locating the main body of the self-elevating drillship on the sea at the upper part of the leg under the state where the leg is connected to the barge by the mooring line; inserting the leg into the main body by the float-over method ballasting the main body and de-ballasting the leg if the main body is located at the upper part of the leg; and installing the leg on the sea by jacking-up the leg if the leg is inserted into the main body by the float-over method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-lifting drill rig, and more particularly,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a structure and a method for installing a leg structure of a self-lifting drill ship using a float-over method, and more particularly to a float- The installation structure and method of the self-lifting drill rig that uses the float-over method to reduce the material cost and drying schedule by moving the installation point of the leg structure that was applied in the drying phase after the transportation of the drill ship. .

Self-elevating units or jack-up rigs are floating structures that float on water when moving from sea to sea. However, when drilling in the installation area, three or four support pillars (legs) To the seabed and then fixes the hull to the top of the sea bed.

In recent years, as the mining operation of oil or gas resources in the deep sea area has increased, the self-lifting drill ship, which was mainly used for shallow depths of less than 100 m, has advanced to the deep sea area of 200 m or more in depth.

There are no equipments that can mount the long supporting columns of the self-lifting drill ship used in the deep sea station on the ground at one time. In addition, when the work is carried out several times at sea, the boom height is high, There has been a problem that a large floating floating type crane should be mobilized.

Most floatable floating cranes were manufactured for offshore use, and there were many difficulties in procuring equipment because they could not move and work on several supporting pillars of over 200m in depth and weighing 1,000 tons.

If a supporting column is mounted on the land or coastal area, a long distance travel is required to the sea area. In this case, several hundred of support pillars exceeding 200 m in height and 1,000 tons in weight are projected at the top of the drill ship hull, And it acted as an obstacle to stability.

The technique disclosed in Japanese Patent Laid-Open No. 55-101616 has a problem in that when the second module separated by the rotating rail moves to the correct position, the upper structure flow is large and structurally unstable, the rail and the stopper function are poor, Since the second module is connected to the first module after the first module is seated, there is a disadvantage that the installation is not easy.

Further, the technique disclosed in Japanese Patent No. 55-101616, since the first module is seated on the seabed and then the second module is connected to the first module, the length of the second module is limited to the range in which the platform can rise at sea level It has a definite defect that it is not applicable to the self-lifting drill ship which is installed in the deep sea station and the supporting column length is relatively long.

Conventionally, a leg structure of a self-lifting drill ship has been performed in a drying stage of a drill ship, and a skidding system according to a skidding system, a mounting system using a crane, and a leg- A method using a special device has been applied or proposed to date.

Since the leg structure of the conventional self-lifting drill rig is installed at the drying stage using various equipments, there is a problem that it takes a lot of time to procure and manufacture the material.

Japanese Patent 55-101616

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and its object is to apply a float-over method applied to a marine installation of a large platform overhead structure to the installation of a leg structure of a self- The lift structure is installed in the operation area after the transportation of the self-lifting drill ship, so that the loading point of the leg structure, which was constructed in the drying step of the self-lifting drill ship, And a leg structure mounting structure of the leg structure.

According to an aspect of the present invention, there is provided a structure for installing a leg structure of a self-elevating drill ship on the sea, comprising: a pants installed on the sea for designating a position of the leg; A mooring line connecting the pants to the legs; And a main body of a self-lifting drill string for installing the leg in the sea by a float-over method on the sea floor above the leg.

The pants according to the present embodiment may be provided in a plurality of margins on the left, right, or various directions of the legs so that the legs can be stably connected without tilting.

Also, the trousers may be installed while maintaining the same spacing in the left, right, or various directions of the legs.

The mooring line according to this embodiment is connected to the top of each of the pants and the legs so that the legs can be stably connected from the pants without shaking.

Meanwhile, in order to prevent interference between the main body and the mooring line when the leg is loaded in the main body, the connection position of the mooring line should be determined by securing a free space.

The main body according to the present embodiment can be located at the upper point of the legs while being installed in the space between the pants in the left, right or various directions.

In addition, the leg body may be provided inside the body so that the leg body can be installed on the main body while the leg body is deformed.

The main body may be provided with a jacking system for jacking up the legs to be installed in the main body.

A sprue can is installed under the leg according to the present embodiment, and a temporary control system for controlling the ballast of the sprung can can be installed in the sprue can.

According to another aspect of the present invention, there is provided a method of installing a leg structure of a self-lifting rig in the sea, comprising the steps of: connecting a pant and a leg with a mooring line with a pant to hold the leg on the sea; Placing the main body of the self-lifting drill ship on the sea of the upper part of the leg with the mooring line connected to the pants; and float-over the body when the main body is positioned on the upper part of the leg, Charging the legs into the main body; and jacking up the legs when the legs are loaded into the main body by the float-over method, thereby installing the legs on the marine vessel.

The step of connecting the legs according to the present embodiment to the pants by mooring lines may include connecting the pants in the left, right, or various directions of the legs by providing a plurality of pants on the sea and connecting the pants to the legs by the mooring line .

The step of positioning the main body on the sea of the upper part of the leg according to the present embodiment can position the main body for installing the legs at a position where the legs can be loaded at the sea side, that is, when the legs are connected to the pants with the mooring line.

Jacking up the legs according to the present embodiment and installing them at sea may be accomplished by balancing the body and de-ballasting the legs while the legs are loaded on the leg supports of the body With the operation of the jacking system, the legs can be jacked up to allow the legs to be installed on the surface of the body.

According to another aspect of the present invention, in order to install the leg located at the sea floor on the sea, trousers are installed on the sea, the pants and the legs are connected to each other by a mooring line, It is possible to provide a ship or an offshore structure having a leg structure installation structure of a self-lifting drill rig that utilizes a float-over method so that legs can be installed on the sea by jacking-up after charging the main body into a jack.

As described above, according to the structure and method of installing the leg structure of the self-lifting drill ship applying the float-over method of the present invention, sufficient drying schedule of the leg structure requiring a long period of time for procuring and manufacturing the material is ensured, The risk of rework is greatly reduced and the entire drying schedule of the self-lifting drill ship can be shortened.

In addition, since it is not necessary to consider the fatigue damage condition during transportation, which occupies a large part of the fatigue damage of the leg structure, the weight of the leg structure itself is reduced, thereby reducing the material cost and the production cost.

1 is a front view of legs connected to a pants in a step for installing a leg structure according to the present invention on the sea.
FIG. 2 is a front view of the main body in two steps for installing the leg structure according to the present invention on the sea.
FIG. 3 is a front view of a main body in which a leg is loaded by a float-over method in three steps for installing a leg structure according to the present invention on the sea.
FIG. 4 is a front view of a leg installed on the sea in four steps for installing the leg structure according to the present invention at sea; FIG.
5 is a block diagram illustrating an installation method for installing a leg structure according to the present invention on the sea.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the leg structure of the self-lifting rig according to the present invention is installed on the sea, and includes a pants 200 for supporting the leg 100 provided on the seabed, A mooring line 210 connecting the legs 100 and 200 to the mooring line 210 and a mooring line 210 connecting the mooring line 210 to the mooring line 210, And includes a main body 300 of a self elevating drill rig.

The leg 100 according to the present embodiment is provided with a spud can 110 for fixing the leg 100 to the sea floor at the bottom while being provided on the sea floor.

The temporary control system 120 is installed in the spud can 110 to control the ballast of the leg 100 and the spud can 110.

That is, since the leg 100 is not installed in the main body 300, the temporary control system 120 is installed for the operation.

The pants 200 according to the present embodiment are installed in the sea so that the legs 100 can be held in the left, right, or various directions of the legs 100 so that the legs 100 can be stably connected without being inclined Respectively.

The pants 200 are preferably equally spaced in the left, right, or various directions of the legs 100 so as not to be tilted when the legs 100 are lifted.

The mooring line 210 according to the present embodiment is connected to the upper part of the leg 100 and the pants 200 so that the leg 100 can be connected to the pants 200.

At this time, the mooring line 210 is connected to the left and right pants 200, and each mooring line 210 is connected to the upper portion of the leg 100, so that the leg 100 does not flow, .

The main body 300 according to the present embodiment is installed at a position between the pants 200 and the pants 200 and positioned at an upper point of the legs 100.

The main body 300 and the leg 100 are raised and lowered by the float over method and the leg 100 is loaded on the main body 300 according to the float over method.

The leg 100 may be installed on the main body 300 by a float over method in which the main body 300 is ballasted and the leg 100 is de-ballasted on the inside of the main body 300 The leg support 310 is formed.

The main body 300 is provided with a jacking system 320 for jacking up the legs 100 to be installed on the main body 300.

That is, when the main body 300 is positioned on the sea above the leg 100, the main body 300 is ballasted by a float over method, and the leg 100 is dewaxed while the main body 300 is placed on the leg supporting portion 310 of the main body 300 The leg 100 is loaded and under the control of the jacking system 320, the leg 100 is jacked up and installed in the sea.

As shown in FIGS. 1 to 5, a method of installing a leg structure of a self-lifting rig according to another aspect of the present invention includes installing pants 200 on the sea A step S100 of connecting the pants 200 and the leg 100 to the mooring line 210 while the leg 100 is connected to the pants 200 by the mooring line 210, (S200) of placing the main body 300 of the self-lifting drill ship on the sea floor of the upper part of the leg 100, The leg 100 is jacked up by jacking up the main body 300 by the float over method so that the main body 300 is pushed into the main body 300 (Step S400).

The step S100 of connecting the pants 200 and the leg 100 to the mooring line 210 according to the present embodiment is performed by arranging a plurality of pants 200 at the same interval on the left and right sides of the leg 100, And the pants 200 on both sides are connected to the mooring line 210 on the left and right sides of the leg 100, respectively.

The pants 200 are provided at a plurality of positions in the sea but both pants 200 are installed at equal intervals around the legs 100 and the pants 200 and the legs 100 are connected to the mooring line 210 So that a constant force is applied to the leg 100 to maintain the leg 100 in a vertical position.

The step S200 of placing the main body 300 on the upper side of the leg 100 according to the present embodiment is performed by connecting the leg 100 to the pants 200 with the mooring line 210, The main body 300 is positioned at a position where the leg 100 can be loaded so as to be installed on the sea.

That is, when the main body 300 is positioned in the sea, the leg 100 and the leg supporting portions 310 of the main body 300 are positioned while maintaining the same linearity.

The step S300 of loading the leg 100 into the main body 300 by the float over method according to the present embodiment is performed when the main body 300 is positioned on the upper sea of the leg 100, the leg 100 is loaded into the main body 300 by a float over method in which the leg 100 is ballasted and de-ballasting is performed.

That is, when the main body 300 and the leg 100 are raised and lowered by a float over method, the leg 100 is loaded into the leg supporting portion 310 of the main body 300.

When the leg 100 according to the present embodiment is loaded in the main body 300, jacking-up and installing the leg 100 in the sea (S400) The leg 100 is jacked up by the operation of the jacking system when the leg 100 is loaded on the leg supporting portion 310 of the main body 300 by the float over method, As shown in FIG.

According to another aspect of the present invention, the pants 200 are installed on the sea where the leg 100 is installed, and the pants 200 and the leg 100 are connected to each other by the mooring line 210, The leg 100 is installed on the sea of the main body 300 while the main body 300 of the self elevating drill rig is positioned on the sea of the upper point and the leg 100 is loaded into the main body 300 by the float over method, Is applied to a ship or an offshore structure having a leg structure installation structure of a self-lifting drill rig that uses a float-over method so that the installation point of the leg structure can be moved after the main body is transported.

That is, to install the leg structure on the sea, the leg 100 installed on the sea floor is connected to the pants 200 by the mooring line 210 and the main body 300 is positioned on the leg 100, The leg 100 is loaded into the main body 300 by a float over method in which the leg 100 is ballasted and de-ballasting the leg 100, and then the jack 100 is jack- -up), it is possible to transfer the installation point of the leg structure, which is constructed in the drying step of the self-lifting drill ship, to the ship after the transportation of the main body 300, thereby reducing the overall drying schedule. .

As described above, according to the structure and method of installing the leg structure of the self-lifting drill rig that employs the float-over method of the present invention, the pants 200 are installed on the sea so as to support the leg 100 installed on the sea floor, And the leg 100 to the mooring line 210.

At this time, the pants 200 installed on the sea are installed at the same positions on the left, right, or various directions of the legs 100, and are connected to the left and right sides or the various directions of the legs 100 with the mooring lines 210 The leg 100 can be stably supported without any flow in the vertical state.

When the main body 300 is positioned on the upper side of the leg 100 in a state where the leg 100 is connected to the pants 200 by the mooring line 210, And the leg 100 is loaded on the leg support 310 of the main body 300 by applying a de-ballasting float over method of the leg 100. [

When the leg 100 is loaded on the main body 300 by the float over method, the jack 100 is jacked up by the jacking system to complete the installation of the leg 100 in the sea.

Therefore, according to the present invention, the leg 100 can be easily installed in the sea by the float-over method, and the drying schedule of the leg structure can be sufficiently secured.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and any person skilled in the art can make various modifications without departing from the gist of the present invention. It is to be understood that such changes and modifications are intended to fall within the scope of the appended claims.

100: Leg
110: Spread can
120: Temporary control system
200: Pants
210: Mooring line
300:
310:
320: Jacking system

Claims (9)

A structure for installing a leg structure of a self elevating drill ship on the sea,
Pants for positioning the legs on the sea;
A mooring line connecting the pants to the legs; And
A main body of a self-lifting drill string installed on the sea above the leg to install the leg in the sea by a float-over method;
/ RTI >
The pants are provided in a plurality of margins on the left, right, or various directions of the legs so that the legs can be stably connected without being inclined in a vertical state,
The trousers are installed in the left, right, or various directions of the legs while maintaining the same spacing,
The mooring line is connected to both the pants and the upper legs so that the legs can be connected stably without shaking from the pants,
The main body is provided with a jacking system for jacking up the legs and installing the legs on the main body,
And a temporary control system for controlling the ballast of the sprung can is installed in the sprand can at a lower portion of the leg, wherein the leg control structure is installed in the sprue can. delete delete delete The method according to claim 1,
Wherein the main body is located on the upper side of the legs while being installed on the sea between the left and right pants. The method according to claim 1,
Wherein a leg support portion is formed on the inside of the main body so that the leg can be charged into the main body while being demagnetized. delete delete A method of installing a leg structure of a self elevating drill ship on the sea,
Connecting the pants to the legs by a mooring line while installing a plurality of pants for catching the legs at sea;
Placing the main body of the self-lifting drill ship on the sea of the upper leg with the legs connected to the pants by a mooring line;
Loading the leg into the main body by float-over method in which the body is ballasted and the leg is de-balted when the main body is positioned on the upper portion of the leg; And
Jacking up the legs when the legs are loaded into the body by the float-over method, and installing the legs on the water jacket;
A method of installing a leg structure of a self elevating drill ship using a float overlay method.
KR1020150055193A 2015-04-20 2015-04-20 Structure and method for leg structure installation of self-elevating unit using float over KR101669260B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040159276A1 (en) * 2002-09-13 2004-08-19 Tor Persson Method for installing a self-floating deck structure onto a buoyant substructure
KR101271741B1 (en) * 2011-06-16 2013-06-04 삼성중공업 주식회사 Ship for offshore installation and method for installing the same
KR101463188B1 (en) * 2010-07-23 2014-11-19 재팬 마린 유나이티드 코포레이션 Working system for floating structure, floating structure, working ship, and working method for floating structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040159276A1 (en) * 2002-09-13 2004-08-19 Tor Persson Method for installing a self-floating deck structure onto a buoyant substructure
KR101463188B1 (en) * 2010-07-23 2014-11-19 재팬 마린 유나이티드 코포레이션 Working system for floating structure, floating structure, working ship, and working method for floating structure
KR101271741B1 (en) * 2011-06-16 2013-06-04 삼성중공업 주식회사 Ship for offshore installation and method for installing the same

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