KR20140104556A - Mid-depth buoy tank system for riser support and actuating method thereof - Google Patents

Mid-depth buoy tank system for riser support and actuating method thereof Download PDF

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Publication number
KR20140104556A
KR20140104556A KR1020130017355A KR20130017355A KR20140104556A KR 20140104556 A KR20140104556 A KR 20140104556A KR 1020130017355 A KR1020130017355 A KR 1020130017355A KR 20130017355 A KR20130017355 A KR 20130017355A KR 20140104556 A KR20140104556 A KR 20140104556A
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KR
South Korea
Prior art keywords
buoyancy tank
tank
ballast
depth buoyancy
depth
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Application number
KR1020130017355A
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Korean (ko)
Inventor
강대훈
강효동
이광민
류민철
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대우조선해양 주식회사
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Priority to KR1020130017355A priority Critical patent/KR20140104556A/en
Publication of KR20140104556A publication Critical patent/KR20140104556A/en

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    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • E21B19/004—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling supporting a riser from a drilling or production platform
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
    • E21B19/09—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

A mid-depth buoyancy tank system for supporting a riser is disclosed. The mid-depth buoyancy tank system, as a mid-depth buoyancy tank system for a riser to develop an oil field where the level of water is low, comprises a ballast tank inside; a conduit where ballast water from the ballast tank flows; a valve installed in the conduit; a pump which sucks or discharges the ballast water from the ballast tank; a mid-depth buoyancy tank equipped with a sea chest for allowing the ballast water to flow in or flow out; a tether installed in the lower part of the mid-depth buoyancy tank to support the mid-depth buoyancy tank on the seabed; and an active ballasting device which discharges the ballast water from the ballast tank to increase the buoyancy of the mid-depth buoyancy tank when the rotation of the mid-depth buoyancy tank is detected to be faster than a predetermined value of a movement measuring device installed inside the mid-depth buoyancy tank designed to detect the rotation caused by currents and waves.

Description

Technical Field [0001] The present invention relates to a mid-depth buoyancy tank system for supporting a riser,

The present invention relates to a riser mid-buoy buoyant tank system for use in oilfield development in low water depths, more specifically to a buoyancy tank system having a predetermined water level, The ballast water installed in the middle water depth buoyancy tank is automatically discharged to increase the buoyancy of the middle water depth buoyancy tank and increase the vertical direction stiffness to increase the buoyancy of the middle water depth buoyancy tank. And more particularly, to a middle water depth buoyancy tank system for supporting a riser capable of preventing a sagging phenomenon of a tether supporting a middle water depth buoyancy tank.

Riser systems are generally used to develop oilfields in low-water areas.

In the riser system, the application of the mid-depth buoy tank is increasing. However, in the region where the tides and waves are severe, the rotational motion of the middle water depth buoyancy tank is severe, and the tether connecting the tanks has a higher dynamic load than the design load, and the tether is very likely to be destroyed. In order to prevent this, the motion of the middle buoyancy buoyancy tank by waves or tidal currents should be reduced or blocked.

Conventionally, in order to generate excessive buoyancy, the middle buoyancy buoyancy tank is formed as an empty space and is connected by a tether to maintain the position of the middle buoyancy buoyancy tank, and a tensile force is applied by buoyancy of the middle buoyancy buoyancy tank .

The middle buoyancy buoyant tank is rotated by waves and tidal currents. When this rotational motion becomes excessive, a slack phenomenon of the tether (a phenomenon in which the tension is lost in the tether) is instantaneously generated.

After the slag occurs, buoyancy of the middle buoyancy buoyant tank generates tension again. At this moment, huge amount of dynamic load is instantaneously generated in the tether, which causes structural destruction or damage. Which results in shortening of the design life of the tether and disruption of the work due to destruction thereof.

In order to solve the above-mentioned problems, the present invention provides an active ballast which automatically discharges ballast water installed in a middle water depth buoyancy tank when the sea environment is rough due to algae or waves and the rotational motion of the middle water depth buoyancy tank exceeds a predetermined standard. The buoyancy of the middle depth buoyancy tank is increased and the vertical stiffness is increased when the buoyancy is increased so that the rotation motion of the middle depth buoyancy tank is reduced or prevented to prevent the saddle of the tether supporting the middle depth buoyancy tank The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a buoyancy tank system and a method of operation thereof.

In order to accomplish the above object, a middle water depth buoyancy tank system for riser support according to an exemplary embodiment of the present invention includes a ballast system.

Here, the ballast system refers to an active ballasting device that releases the ballast water in the ballast tank to increase the buoyancy of the intermediate depth buoyancy tank when the rotational motion of the intermediate depth buoyancy tank is detected to be greater than a preset value.

The active ballasting device includes a motion measurement device installed inside the intermediate depth buoyancy tank to sense the rotational motion of the middle depth buoyancy tank by the tides and waves. A signal transmission cable is connected to the intermediate depth buoyancy tank for power supply and management of the motion measurement device.

The intermediate depth buoyancy tank includes ballast water, a pipe through which the ballast water flows, a valve installed in the pipe, a pump for sucking or discharging the ballast water, and a seed chest for entering and exiting the ballast water.

The active ballasting device reduces the rotational motion of the intermediate depth buoyancy tank by increasing the buoyancy of the intermediate depth buoyancy tank and increases the rigidity in the vertical direction.

Meanwhile, according to another example of the present invention, a middle water depth buoyancy tank system for riser support is a middle water depth buoyancy tank system of a riser for developing oilfields in a low water depth region, and includes a ballast tank, A middle water buoyancy tank having a valve installed in the pipe, a pump for sucking or discharging the ballast water of the ballast tank, and a seed chest for entering and exiting the ballast water of the ballast tank; A tether installed at a lower portion of the intermediate depth buoyancy tank to support the intermediate depth buoyancy tank on the sea floor; And a motion measuring device is installed inside the intermediate depth buoyancy tank to sense the rotational motion of the middle depth buoyancy tank by algae and waves, and the rotational motion of the middle depth buoyancy tank is measured by the motion measuring device And an active ballasting device for releasing the ballast water of the ballast tank to increase the buoyancy of the intermediate depth buoyancy tank when it is largely sensed.

The active ballasting device includes an umbilical cable connected to the intermediate depth buoyancy tank for powering and managing the motion measurement device.

The active ballasting device reduces the rotational motion of the intermediate depth buoyancy tank by increasing the buoyancy of the intermediate depth buoyancy tank and increases the rigidity in the vertical direction.

Meanwhile, the method of operating the middle water depth buoyancy tank system according to the present invention detects the rotational motion of the middle water depth buoyancy tank by the tides and waves in the motion measuring device, and transmits the sensing signal through the umbilical cable To a control unit; A second step of determining whether the rotational motion of the intermediate depth buoyancy tank is detected to be larger than a preset value by the controller; And when the rotational motion of the intermediate depth buoyancy tank is sensed to be greater than a predetermined value, the control unit discharges the ballast water of the ballast tank of the intermediate depth buoyancy tank through the umbilical cable, And a third step of increasing the buoyancy of the tank.

In the third step, the valve is opened to discharge the ballast water and the pump is operated to discharge the ballast water out of the middle depth buoyancy tank through the seed chest.

In the third step, the buoyancy of the middle depth buoyancy tank is raised to reduce the rotational motion of the middle depth buoyancy tank, and the rigidity in the vertical direction is increased, thereby preventing the tether from slacking.

As described above, the present invention can improve the stability of the system by preventing the saddle of the tether by applying the active ballasting system to the middle depth buoyancy tank.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view of a middle deep water buoyancy tank system for riser support according to a preferred embodiment of the present invention;
2 is a view showing an internal configuration of a middle water depth buoyancy tank for supporting a riser according to a preferred embodiment of the present invention;
3 is a view showing an active ballasting apparatus according to a preferred embodiment of the present invention.
4 is a block diagram illustrating a method of operating a middle deep water buoyancy tank system for riser support in accordance with a preferred embodiment of the present invention;

Hereinafter, a middle water depth buoyancy tank system for riser support according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing a middle water depth buoyancy tank system for riser support according to a preferred embodiment of the present invention, FIG. 2 is a view showing the internal structure of a middle water depth buoyancy tank for riser support according to a preferred embodiment of the present invention, Is a schematic view showing an active ballasting apparatus according to a preferred embodiment of the present invention.

Referring to FIGS. 1 to 3, a middle water depth buoyancy tank system for supporting a riser according to a preferred embodiment of the present invention includes a riser R for developing oilfields in a low water depth region, and a middle depth buoyancy tank 100) to the seabed surface. The tether 200 is made of steel wire. Here, the intermediate depth refers to the middle part between the sea level and the sea floor.

In addition, the riser support intermediate depth buoyancy tank system in accordance with the preferred embodiment of the present invention includes a ballast system, i. E., An active ballasting device 300.

When the rotational motion of the middle water depth buoyancy tank 100 is detected to be larger than a preset value, that is, when the active water ballasting tank 100 is roughly flooded, By increasing the buoyancy of the intermediate depth buoyancy tank 100 by discharging the ballast water 101 of the ballast tank 110 automatically when the rotational motion occurs larger than the preset value, Of the system. Here, the rotational motion refers to a motion in which both the middle water depth buoyancy tank 100 flow upward and downward with respect to the center line (X axis).

The active ballasting device 300 of the present invention is provided with a motion measuring device 310 inside the middle depth buoyancy tank 100 to sense the rotational motion of the middle depth buoyancy tank 100 by the tides and waves, A Umbilical cable 320 is installed in the middle depth buoyancy tank 100 for power supply and management of the motion measuring device 310. The detection signal is transmitted through the umbilical cable 320 to the control unit 330 of the maritime structure or ship located in the sea.

The middle water depth buoyancy tank 100 includes a ballast water tank 101 in which the ballast water 101 of the ballast tank 110 and a ballast water 101 of the ballast tank 110 are moved, A pump 104 for sucking or discharging the ballast water 101 and a seed chest 105 for inputting / discharging the ballast water 101 are installed.

In the region where the algae and the waves are severe, since the motion of the middle water depth buoyancy tank 100 is severe, the dynamic load acts on the tether 200 which is connected to the tether 200 more greatly than the design load, The motion of the intermediate water depth buoyancy tank 100 by waves or tides should be reduced or blocked.

Therefore, an active ballasting system is applied to reduce the motion of the middle depth buoyancy tank 100 to increase the buoyancy of the middle depth buoyancy tank 100. This can increase the stiffness of the entire system, thereby reducing or preventing the motion of the middle water depth buoyancy tank 100 due to the marine environment. At this time, a relatively high tensile force acts on the tether 200, which is not good in terms of fatigue life. Accordingly, when the marine environment becomes mild, the buoyancy of the middle buoyancy buoyancy tank 100 is reduced by filling seawater in the middle buoyancy buoyancy tank 100, thereby reducing the tensile force acting on the tether 200.

4 is a block diagram illustrating a method for operating a riser-supported intermediate depth buoyancy tank system in accordance with a preferred embodiment of the present invention.

4, the method for operating a riser-supported intermediate depth buoyancy tank system according to the present invention detects a rotational motion of a middle water depth buoyancy tank 100 by a bird and a wave in a motion measuring device 310 A first step (S 10) of transmitting a sensing signal through a umbilical cable (320) to a control unit (330) of a marine structure located in the sea; A second step S 20 of determining whether the rotational motion of the intermediate depth buoyancy tank 100 is detected to be greater than a preset value by the controller 330; The control unit 330 controls the ballast water flow rate of the ballast tank 110 through the umbilical cable 320 when the rotational motion of the intermediate depth buoyancy tank 100 is detected to be greater than a predetermined value. (S30) of increasing the buoyancy of the intermediate depth buoyancy tank (100) by discharging the buoyancy (101).

In the third step S30, the valve 103 is opened to discharge the ballast water 101 and the pump 104 is operated to discharge the ballast water 101 through the seed chest 105 to the middle depth buoyancy tank (100).

In the third step S30, the buoyancy of the middle depth buoyancy tank 100 is increased to reduce the rotational motion of the middle depth buoyancy tank 100 and to increase the rigidity in the vertical direction, Thereby preventing the phenomenon.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible within an even range.

R: riser
100: Medium depth buoyancy tank
101: Ballast water
102: Piping
103: Valve
104: pump
105: Seed Chest
110: Ballast tank
200: Tether
300: Active ballasting device
310: Motion measuring device
320: Umbrella cable
330:

Claims (12)

A mid - water buoyant tank system for riser support having a ballast system. The method according to claim 1,
Wherein the ballast system includes an active ballasting device for discharging ballast water in the ballast tank to increase the buoyancy of the intermediate depth buoyancy tank when the rotational motion of the intermediate depth buoyancy tank is detected to be greater than a predetermined value Medium depth buoyancy tank system for riser support. The method of claim 2,
The active ballasting apparatus includes:
And a motion measuring device installed inside the intermediate depth buoyancy tank to sense the rotational motion of the middle depth buoyancy tank due to the tide and the waves. The method of claim 2,
The active ballasting apparatus includes:
And a Umblical cable connected to the intermediate depth buoyancy tank for power supply and management of the motion measuring device. The method of claim 2,
Wherein the intermediate depth buoyancy tank includes a ballast tank therein, a pipe through which the ballast water flows in the ballast tank, a valve installed in the pipe, a pump for sucking or discharging the ballast water in the ballast tank, And a seed chest for supporting the riser. The method of claim 2,
Wherein the active ballasting device is structured to reduce the rotational motion of the intermediate depth buoyancy tank and increase the rigidity in the vertical direction due to the buoyancy of the intermediate depth buoyancy tank. In a riser's mid-depth buoyancy tank system for developing oilfields of low depth,
A ballast tank, a pipe through which the ballast water of the ballast tank moves, a valve installed in the pipe, a pump for sucking or discharging the ballast water of the ballast tank, and a seed chest for entering and exiting the ballast water of the ballast tank A middle depth buoyancy tank;
A tether installed at a lower portion of the intermediate depth buoyancy tank to support the intermediate depth buoyancy tank on the sea floor;
Wherein a motion measuring device is installed inside the intermediate depth buoyancy tank so as to sense the rotational motion of the middle depth buoyancy tank by the tide and the waves, and the rotational motion of the middle depth buoyancy tank is made larger An active ballasting device for releasing ballast water from the ballast tank to increase the buoyancy of the intermediate depth buoyancy tank when sensed. The method of claim 7,
Wherein the active ballasting device includes an umbilical cable connected to the intermediate depth buoyancy tank for powering and management of the motion measurement device. The method of claim 7,
Wherein the active ballasting device is structured to reduce the rotational motion of the intermediate depth buoyancy tank and increase the rigidity in the vertical direction due to the buoyancy of the intermediate depth buoyancy tank. A first step of sensing the rotational motion of the middle buoyancy buoyancy tank by the tide and wave in the motion measuring device and transmitting the detection signal to the control part of the offshore structure located on the sea via the umbilical cable;
A second step of determining whether the rotational motion of the intermediate depth buoyancy tank is detected to be larger than a preset value by the controller; And
As a result of the determination, when the rotational motion of the intermediate depth buoyancy tank is detected to be larger than a preset value, the controller controls the buoyancy of the intermediate depth buoyancy tank by discharging the ballast water of the intermediate depth buoyancy tank through the umbilical cable And a third step of increasing the volume of the riser. The method of claim 10,
In the third step, the valve is opened to discharge the ballast water, and the pump is operated to discharge the ballast water through the seed chest to the outside of the middle water depth buoyancy tank. . The method of claim 10,
Wherein the buoyancy of the middle depth buoyancy tank is increased to reduce the rotational motion of the middle depth buoyancy tank and to increase the rigidity in the vertical direction to thereby prevent the saddle phenomenon of the tether, A method of operating a buoyancy tank system.
KR1020130017355A 2013-02-19 2013-02-19 Mid-depth buoy tank system for riser support and actuating method thereof KR20140104556A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180078539A (en) 2016-12-30 2018-07-10 대우조선해양 주식회사 Flap apparatus and method for blocking the water inlet in the buoyancy tank

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180078539A (en) 2016-12-30 2018-07-10 대우조선해양 주식회사 Flap apparatus and method for blocking the water inlet in the buoyancy tank

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