KR20120138041A - Drillship with combining form of moonpool structure considering additional resistance control - Google Patents

Drillship with combining form of moonpool structure considering additional resistance control Download PDF

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KR20120138041A
KR20120138041A KR1020110057307A KR20110057307A KR20120138041A KR 20120138041 A KR20120138041 A KR 20120138041A KR 1020110057307 A KR1020110057307 A KR 1020110057307A KR 20110057307 A KR20110057307 A KR 20110057307A KR 20120138041 A KR20120138041 A KR 20120138041A
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South Korea
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door pool
flow
drillship
side wall
door
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KR1020110057307A
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Korean (ko)
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KR101259718B1 (en
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안유원
하경진
이종승
이강훈
김형관
고석천
김정후
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현대중공업 주식회사
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00—Supports for the drilling machine, e.g. derricks or masts
    • E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
    • B63B2001/325—Interceptors, i.e. elongate blade-like members projecting from a surface into the fluid flow substantially perpendicular to the flow direction, and by a small amount compared to its own length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B2003/147—Moon-pools, e.g. for offshore drilling vessels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Abstract

PURPOSE: A drill ship with a composite moonpool resistance reducing structure is provided to reduce the flow of seawater putting into a moon by deriving the moderate flow of seawater. CONSTITUTION: A drill ship with a composite moonpool(100) resistance reducing structure comprises a flow stabilizing section(110), an inclined part(120), and a sliding control deck(130). The flow stabilizing section is formed by inflow-processing a part of the bottom of a block(140). The block forms an wall side(100a) toward the stem of a moon pool. The inclined part is formed by processing the lower part of an wall side toward the stern(100b) to be downwardly inclined toward the stern. The sliding control deck is formed to be protruded from the wall side toward the stern. The sliding control deck restrains the seawater flow in the moonpool. [Reference numerals] (AA) Stern side; (BB) Bow side

Description

복합형 문풀 저항 저감 구조를 갖는 드릴쉽{Drillship with combining form of moonpool structure considering additional resistance control}Drillship with combining form of moonpool structure considering additional resistance control}

본 발명은 문풀 내에 설치되는 섭동제어데크와 문풀의 저부에 형성되는 경사부 및 인입형 유동안정부의 복합적인 조합을 통해 문풀로 인해 발생되는 부가저항을 보다 효과적으로 제어 할 수 있도록 한 복합형 문풀 저항 저감 구조를 갖는 드릴쉽에 관한 것이다.The present invention is a composite door pool resistor to more effectively control the added resistance caused by the door pool through a combination of the perturbation control deck installed in the door pool and the inclined portion and the pull-out oil formed on the bottom of the door pool The present invention relates to a drillship having a reducing structure.

드릴쉽의 구조를 살펴보면 시추작업을 위한 파이프를 해저면으로 내려 보내기 위해 선체 중심부에는 선체를 수직으로 관통하는 문풀(moonpool)이 형성되어 있다.Looking at the structure of the drillship, in order to send the pipe for drilling work down to the sea floor, a moonpool is formed at the center of the hull vertically through the hull.

한편 상기 문풀 내부에는 흘수와 같은 높이의 자유 수면이 존재하게 되며, 선박의 운항 시 문풀 내부에는 유동과 더불어 일정한 주기를 갖는 상하 유동이 발생하는 현상이 나타나게 된다. 또한 일정 속도 이상에서는 문풀의 자유 수면이 파랑으로 발전하게 되고, 나아가서는 쇄파까지도 일어나게 된다. 이렇게 발생된 문풀 내부의 파랑은 문풀의 후단벽면을 치기도 하는데 이러한 현상들은 일종의 부가저항으로써 선체 자체에 걸리는 정수 중 저항을 증가시키는 결과를 나타내게 된다.On the other hand, there is a free surface of the same height as the draft draft inside the door pool, the phenomenon occurs that the up and down flow with a certain period with the flow occurs inside the door pool during the operation of the vessel. In addition, above a certain speed, Moonpool's free water surface develops into blue, and even breaking waves occur. The generated blue waves in the door pool hit the rear wall of the door pool. These phenomena are a kind of additional resistance, which results in an increase in the resistance of the hull itself.

상기와 같은 문풀 내의 유동 교란에 의해 야기되는 저항 성능 저하를 개선하기 위해 종래에는 도 1과 같이 문풀(50)의 선수부 모서리에 해저방향으로 경사지게 돌출된 경사돌출부(20)를 설치하여 경사돌출부의 끝에서 발생하는 와류(Vortex)를 제어하고, 문풀(50)을 지나는 외부 유동(S20)의 박리각도(θ)를 조절하고자 하였다.In order to improve resistance degradation caused by flow disturbance in the door pool as described above, the inclined protrusion 20 protruding obliquely in the sea direction is installed at the edge of the bow portion 50 as shown in FIG. To control the vortex (Vortex) generated in the and to control the peel angle (θ) of the external flow (S20) passing through the door pool (50).

하지만 상기와 같은 유동 교란 저감구조는 작업단(3)에 부가 형성된 경사돌출부(20)가 드릴쉽의 선저 바닥면보다 하부 해저방향으로 돌출되어 선박 건조 시 수심에 의한 제약을 받을 수 있다는 문제점과, 또한 박리 각도를 일정하게 유지하면서 성능 개선을 추구할 경우 경사돌출부(20)가 지나치게 커지게 된다는 문제점과, 또한 경사돌출부(20)의 높이를 일정하게 유지하면서 성능 개선을 추구할 경우 박리 각도가 증가되어 드릴쉽에 작용하는 저항의 평균값이 증가한다는 문제점이 있다.However, the flow disturbance reduction structure as described above has a problem that the inclined protrusion 20 additionally formed at the work end 3 protrudes in the lower seabed direction from the bottom of the bottom of the drillship, and thus may be restricted by the depth of the ship when it is built. The problem that the inclined protrusion 20 becomes too large when the performance is improved while maintaining the peeling angle is constant, and the peeling angle is increased when the performance is improved while the height of the inclined protrusion 20 is constantly maintained. There is a problem that the average value of the resistance acting on the drillship increases.

이러한 문제점을 개선하기 위한 종래 기술로 도 2와 같이 문풀(50)의 작업단(3)에 인입형 유동안정화부(30)를 형성한 드릴쉽이 연구되고 있다. 도시된 바와 같이 작업단에 형성된 인입형 유동안정화부는 크게 유동유입부(31), 유동평형부(32), 유동박리부(33)로 구성된다. 유동유입부의 경우 드릴쉽의 선수로부터 선저를 따라 흐르는 유동이 인입형 유동안정화부로 유동 박리나 재순환없이 유입되게 하는 역할을 하며, 유동평형부의 경우 상기 유동유입부를 통해 들어온 유동에서 발생한 압력 구배나 속도 구배를 제어하는 역할을 하며, 유동박리부의 경우 문풀 내로 유입되는 유선과 와류의 발생을 제어하는 역할을 한다. 인입형 유동안정화부의 기하학적 특성상 유동박리부의 효과는 유동평형부와 유동유입부를 지나는 유동 특성(압력 구배, 속도 구배, 난류 운동에너지 등)에 의해 영향을 받게 되며, 유동박리부가 가장 효과적으로 유선 박리 및 와류 발생을 제어하도록 유동평형부와 유동유입부의 형상을 설계한다. 그러나 선저를 따라 흐르는 유동의 모멘텀이 높아질 경우 유동유입부 및 유동평형부의 형상 변경만으로 유동박리부로 유입되는 유동 특성을 제어하기 어려운 문제점이 있다.As a conventional technique for improving such a problem, a drillship in which an introduction type oil purifying part 30 is formed at the work end 3 of the door pool 50 is studied as shown in FIG. 2. As shown, the inlet-type oil purification unit formed in the working stage is largely composed of a flow inlet 31, a flow balancer 32, and a flow peeler 33. In the case of the flow inlet, the flow flowing from the bow of the drillship to the bottom of the drillship is allowed to flow into the inlet-type purifier without flow separation or recirculation.In the case of the flow balance unit, the pressure gradient or velocity gradient generated from the flow introduced through the flow inlet. In the case of the flow peeler, it controls the generation of mammary glands and vortices flowing into the door pool. Due to the geometrical characteristics of the inlet flow purification part, the effect of the flow peeler is influenced by the flow characteristics (pressure gradient, velocity gradient, turbulent kinetic energy, etc.) passing through the flow equilibrium and the flow inlet, and the flow peeler is most effectively streamlined and vortex Design the shape of the flow balance and flow inlet to control the generation. However, when the momentum of the flow flowing along the bottom is increased, it is difficult to control the flow characteristics flowing into the flow separation part only by changing the shape of the flow inflow part and the flow balance part.

본 발명은 상기와 같은 문제점을 고려하여 이루어진 것으로, 본 발명의 목적은 문풀 내에 설치되는 섭동제어데크와 선수측 벽면을 형성하는 블록에 형성된 인입형 유동안정화부 그리고 문풀의 선미측 벽면의 하단부에 형성된 경사부의 복합적인 조합을 통해 문풀에서 발생되는 유동 교란을 저감시켜 문풀로 인해 발생되는 저항을 저감시킬 수 있도록 한 복합형 문풀 저항 저감 구조를 갖는 드릴쉽을 제공함에 있다.The present invention has been made in consideration of the above problems, and an object of the present invention is formed in the lower end of the stern-side wall surface of the inlet type oil purification unit formed in the block forming the perturbation control deck and the bow side wall is installed in the door pool; It is to provide a drillship having a composite door pool resistance reduction structure that can reduce the flow disturbance generated by the door pool through the combination of the inclined portion to reduce the resistance caused by the door pool.

상기한 바와 같은 목적을 달성하고 종래의 결점을 제거하기 위한 과제를 수행하는 본 발명의 복합형 문풀 저항 저감 구조를 갖는 드릴쉽은 문풀의 선수측 벽면을 형성하는 블록의 저면 일부분을 선체 상부쪽으로 인입가공하여 형성된 인입형 유동안정화부; 상기 선미측 벽면의 하단부를 선미측을 향해 하향 경사지게 가공하여 형성된 경사부; 및 상기 선미측 벽면으로부터 돌출되게 형성되어 문풀 내의 해수 유동을 억제하는 섭동제어데크를 구비하여 문풀 내의 유동 교란을 저감시킨 것을 특징으로 한다.The drillship having the hybrid door pool resistance reduction structure of the present invention, which achieves the above object and performs the task of eliminating the conventional drawbacks, draws a portion of the bottom surface of the block forming the bow wall of the door pool toward the top of the hull. An inlet oil purifying part formed by processing; An inclined portion formed by inclining a lower end portion of the stern side wall surface toward the stern side; And a perturbation control deck formed to protrude from the stern side wall to suppress seawater flow in the door pool, thereby reducing flow disturbance in the door pool.

한편 상기 섭동제어데크는 문풀의 좌우측 벽면에 연결된 양끝단부 영역이 나머지 중앙부 영역에 비하여 선미측 벽면으로부터 보다 더 돌출되게 형성되는 것이 바람직하다.On the other hand, the perturbation control deck is preferably formed so that both end areas connected to the left and right side wall of the door pool more protrude from the stern side wall than the remaining center area.

이때 상기 양끝단부 영역의 내측면은 문풀의 좌우측 벽면으로부터 중앙부 영역에 근접할수록 돌출길이가 감소하게 선미측 벽면을 향하여 경사지게 연장된 구조로 형성될 수 있다.In this case, the inner side surfaces of the both end portions may be formed to have a structure extending inclined toward the stern side wall so that the protruding length decreases closer to the central portion region from the left and right side wall surfaces of the door pool.

또한 상기 양끝단부 영역의 내측면은 문풀의 좌우측 벽면으로부터 중앙부 영역에 근접할수록 돌출길이가 감소하게 원호를 그리며 연장되게 형성될 수 있다.In addition, the inner side surfaces of the both end regions may be formed to extend in a circular arc so that the protruding length decreases closer to the central region from the left and right wall surfaces of the door pool.

한편 상기 섭동제어데크의 내측면에는 충격흡수용 코팅층이 더 형성될 수 있다.Meanwhile, a shock absorbing coating layer may be further formed on the inner surface of the perturbation control deck.

한편 상기 섭동제어데크는 다수 개로 구성되며, 상기 다수 개의 섭동제어데크들은 수직방향으로 상호 이격되도록 선미측 벽면에 설치될 수 있다.On the other hand, the perturbation control deck is composed of a plurality, the plurality of perturbation control decks may be installed on the stern side wall to be spaced apart from each other in the vertical direction.

이때 상기 다수 개의 섭동제어데크들은 하부에 위치할수록 돌출길이가 짧게 형성되는 것이 바람직하다.At this time, it is preferable that the plurality of perturbation control decks have a shorter protruding length as they are positioned below.

상기와 같은 특징을 갖는 본 발명에 의하면, 인입형 유동안정화부와 경사부가 해수의 적절한 유동을 유도하여 문의 안으로 유입되는 해수의 유동을 저감시킴으로서 문풀 내 자유 수면을 안정화시키고, 더불어 섭동제어테크가 문풀의 내부로 유입되는 해수의 유동을 억제하여 문풀 내 자유 수면을 보다 효과적으로 안정화시킬 수 있는 효과가 있다.According to the present invention having the above characteristics, the retractable oil purifying part and the inclined part induce proper flow of the seawater to reduce the flow of seawater flowing into the door, thereby stabilizing the free surface in the moonpool, and the perturbation control tech By inhibiting the flow of seawater flowing into the interior of the pool has an effect that can more effectively stabilize the free surface.

도 1 은 종래의 한 실시예에 따른 드릴쉽에 설치된 돌출형 유동안정화 장치의 형상을 보인 측면도,
도 2 는 종래의 다른 실시예에 따른 드릴쉽에 설치된 인입형 유동안정화부의 형상을 보인 측면도,
도 3 은 본 발명의 바람직한 실시예에 따른 드릴쉽의 문풀 구조를 나타낸 측면도,
도 4 는 본 발명의 바람직한 실시예에 따른 드릴쉽의 문풀 구조를 나타낸 평면도,
도 5 는 본 발명에 따른 섭동제어데크의 도 다른 구조를 나타낸 평면도.
도 6 은 본 발명에 따른 섭동제어데크가 다수 개로 구성되어 문풀 내에 설치된 상태를 나타낸 측면도,
도 7 은 본 발명에 따른 복합형 문풀 저항 감소 구조가 구비된 문풀 주변의 해수 유동 상태를 나타낸 측면도.1 is a side view showing the shape of a projection oil-type purification device installed in a drillship according to one embodiment of the prior art,
2 is a side view showing the shape of a retractable oil purifying part installed in a drill ship according to another embodiment of the prior art;
Figure 3 is a side view showing the door pool structure of a drill ship according to a preferred embodiment of the present invention,
Figure 4 is a plan view showing a door pool structure of a drill ship according to a preferred embodiment of the present invention,
5 is a plan view showing another structure of the perturbation control deck according to the present invention.
Figure 6 is a side view showing a state in which the perturbation control deck according to the present invention is installed in a door pool composed of a plurality of
Figure 7 is a side view showing the seawater flow around the door pool equipped with a composite door pool resistance reduction structure according to the present invention.

이하, 본 발명의 바람직한 실시예를 첨부된 도면과 연계하여 상세히 설명하면 다음과 같다. 본 발명의 실시예를 설명함에 있어서, 관련된 공지기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그 상세한 설명은 생략한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

도 3은 본 발명의 바람직한 실시예에 따른 드릴쉽의 문풀 구조를 나타낸 측면도를, 도 4는 본 발명의 바람직한 실시예에 따른 드릴쉽의 문풀 구조를 나타낸 평면도를, 도 5는 본 발명에 따른 섭동제어데크의 도 다른 구조를 나타낸 평면도를 도시하고 있다.Figure 3 is a side view showing a door pool structure of a drill ship according to a preferred embodiment of the present invention, Figure 4 is a plan view showing a door pool structure of a drill ship according to a preferred embodiment of the present invention, Figure 5 is perturbation according to the present invention A plan view showing another structure of the control deck is shown.

본 발명에 따른 드릴쉽은 문풀(100) 내의 자유 수면을 안정화시켜 문풀(100)로 인해 선박의 저항 특성이 저하되는 것을 저감시킬 수 있도록 한 것으로, 인입형 유동안정화부(110)와 경사부(120) 및 섭동제어데크(130)가 문풀(100)의 주변에 복합적으로 구성된 것으로 이루어져 있다.Drillship according to the present invention is to stabilize the free water in the door pool 100 to reduce the deterioration of the resistance characteristics of the ship due to the door pool 100, the in-flow oil purification unit 110 and the slope ( 120) and the perturbation control deck 130 is composed of a complex configuration around the door pool (100).

상기 인입형 유동안정화부(110)는 문풀(100)의 선수측 벽면(100a)을 구성하는 블록(140)의 저면 일부분을 선체 상부쪽로 인입되게 형성한 것으로 구성된다. 한편 도 3에는 시추용 장비의 탑재 및 작업의 편의성을 위해 문풀(100)의 선수측에 마련된 작업단의 저면에 인입형 유동안정화부(110)가 형성된 구조가 도시되어 있다.The retractable oil purifying part 110 is configured to form a portion of the bottom surface of the block 140 constituting the bow side wall surface 100a of the door pool 100 toward the upper portion of the hull. Meanwhile, FIG. 3 illustrates a structure in which the retractable oil purifying part 110 is formed on the bottom of the work stage provided on the bow side of the door pool 100 for the convenience of mounting and operation of the drilling equipment.

한편 상기 인입형 유동안정화부(110)는 소정 폭을 갖으며 문풀(100)의 선수측 벽면(100a)의 하단부로부터 선수측을 향하여 소정 길이 연장된 구조로 형성된다. 이때 인입형 유동안정화부(110)의 폭 및 길이는 선박의 크기나 문풀의 크기에 따라 결정될 수 있다.Meanwhile, the retractable oil purifying part 110 has a predetermined width and has a predetermined length extending from the lower end of the bow side wall surface 100a of the door pool 100 toward the bow side. At this time, the width and length of the retractable oil purification unit 110 may be determined according to the size of the vessel or the size of the door pool.

이와 같은 인입형 유동안정화부(110)는 선수측 단부(110a)로부터 선미측을 향해 완만한 곡선면이나 경사면을 형성하면서 블록(140) 내부로 연장된 뒤, 다시 완만한 곡선면이나 경사면을 형성하면서 선수측 벽면(100a)의 하단부로 연장되는 구조를 갖도록 형성되며, 비록 도면상에는 도시되지 않았으나 중앙부에 수평구간이 더 구비될 수도 있다.The retractable oil purifying part 110 extends into the block 140 while forming a smooth curved surface or inclined surface from the bow side end 110a toward the stern side, and then again forms a smooth curved surface or inclined surface. While being formed to have a structure extending to the lower end of the bow side wall surface (100a), although not shown in the figure may be further provided with a horizontal section in the center.

상기와 같은 인입형 유동안정화부(110)는 선박 운항 시, 블록(140)의 하부에서 해수의 유동이 S100(도 7에 도시됨)과 같은 흐름을 형성하면서 문풀(100)로부터 멀어지게 되므로, 해수의 유동이 문풀(100)의 내부로 유입되는 것을 방지하게 된다.As the above-mentioned retractable oil purifying unit 110 moves away from the door pool 100 while forming a flow such as S100 (shown in FIG. 7) at the bottom of the block 140 when the ship is operated, The flow of sea water is prevented from flowing into the interior of the door pool 100.

상기 경사부(120)는 문풀(100)의 선미측 벽면(100b)의 하단부에서 형성되어 인입형 유동안정화부(110)에 의해 형성된 해수 유동이 선미측 벽면(100b)을 통해 문풀(100)의 내부로 유입되는 것을 저감시키는 것이다.The inclined portion 120 is formed at the lower end of the stern side wall surface 100b of the moon pool 100 so that the seawater flow formed by the retractable oil purifying part 110 is connected to the stern side wall surface 100b of the moon pool 100. It is to reduce the inflow into the interior.

이러한 경사부(120)는 선미측 벽면(100b)의 하단부를 선미측을 향하여 하향 경사진 구조로 가공한 것으로 구성되어 S100과 같은 해수 유동이 경사부(120)에 부딪칠 경우, 해수가 문풀(100)의 내부로 유입되지 않고 그대로 선미측을 향해 유동하도록 유도하게 된다.The inclined portion 120 is configured by processing the lower end of the stern side wall surface (100b) in a downwardly inclined structure toward the stern side, when the seawater flow such as S100 hits the inclined portion 120, the seawater is a door pool ( It does not flow into the interior of 100) and is induced to flow toward the stern side as it is.

상기와 같이 인입형 유동안정화부(110)와 경사부(120)를 이용하여 문풀(100)의 내부로 유입되는 해수 유동을 억제하여 문풀(100) 내 자유 수면을 비교적 안정된 상태로 유지시킬 수 있으나, 일부 해수는 문풀(100)의 내부로 유입되어 문풀(100) 내 유동 교란을 발생시키게 된다.As described above, the free water in the door pool 100 can be maintained in a relatively stable state by suppressing the flow of seawater introduced into the door pool 100 by using the inflow type purifying part 110 and the inclination part 120. , Some sea water is introduced into the door pool 100 to cause flow disturbance in the door pool 100.

상기 섭동제어데크(130)는 문풀(100) 내로 유입되는 해수의 유동을 억제하여 문풀(100) 내 유동 교란의 발생을 억제하는 것으로, 선미측 벽면(100b)으로부터 선수측을 향하여 돌출된 구조로 형성된다. 이러한 섭동제어데크(130)는 수평하게 연장되도록 형성될 수도 있고, 상부 또는 하부를 향하여 소정 각도 기울어진 채로 연장되게 형성될 수도 있다.The perturbation control deck 130 suppresses the flow of seawater flowing into the door pool 100 and suppresses the occurrence of flow disturbances in the door pool 100. The perturbation control deck 130 protrudes toward the bow side from the stern side wall surface 100b. Is formed. The perturbation control deck 130 may be formed to extend horizontally, or may be formed to extend at a predetermined angle toward the upper or lower portion.

한편 상기 섭동제어데크(130)는 문풀(100)의 좌우측 벽면(100c,100d)에 연결되는 양끝단부 영역(131)이 나머지 중앙부 영역(132)에 비하여 선미측 벽면(100b)으로부터 보다 더 돌출된 구조로 형성되어 있다. 이는 선미측 벽면(100b)을 타고 유입되는 해수의 유동은 좌우측 벽면(100c,100d)으로 분산되어 문풀(100)의 중앙부로 유입되는 해수 유동량은 상대적으로 적으며, 또한 시추장비에 설치되고 문풀(100)을 통해 해저로 연장되는 드릴파이프의 흔들림에 의해 드릴파이프와 섭동제어데크(130)의 충돌이 발생될 수 있으나, 상기와 같이 해수 유동 제어에 효과적인 양끝단부 영역(131)의 돌출길이(L1)는 증가시키고 중앙부 영역(132)의 돌출길이(L2)는 감소시킴으로써 섭동제어데크(130)로 인한 불필요한 중량증가를 방지하고, 해수 유동억제를 위한 충분한 면적을 확보하면서도 드릴파이프와 섭동제어데크(130)의 충돌을 방지할 수 있게 된다.On the other hand, the perturbation control deck 130 has both end portions 131 connected to the left and right wall surfaces 100c and 100d of the door pool 100 more protruding from the stern side wall surface 100b than the remaining central region 132. It is formed in a structure. This is because the flow of seawater flowing through the stern side wall surface 100b is distributed to the left and right wall surfaces 100c and 100d so that the amount of seawater flowing into the center portion of the door pool 100 is relatively small, and it is also installed in the drilling equipment and the door pool ( The collision of the drill pipe and the perturbation control deck 130 may occur due to the shaking of the drill pipe extending through the seabed 100, but the protrusion length L1 of both end regions 131 effective for seawater flow control as described above. ) Increases and decreases the protrusion length (L2) of the central region 132 to prevent unnecessary weight increase due to the perturbation control deck 130, while ensuring a sufficient area for seawater flow control while drilling pipe and perturbation control deck ( The collision of 130) can be prevented.

상기와 같은 섭동제어데크(130)의 양끝단부 영역(131)은 일정한 돌출길이를 갖는 사각형의 평면구조로 형성될 수도 있으나, 양끝단부 영역(131)의 내측면(131a)이 문풀(100)의 좌우측 벽면(100c,100d)으로부터 중앙부 영역(132)에 근접할수록 돌출길이가 감소하게 선미측 벽면(100b)을 향하여 경사지게 연장되게 형성되거나(도 4 참조), 또는 양끝단부 영역(131)의 내측면(131a)이 문풀(100)의 좌우측 벽면(100c,100d)으로부터 중앙부 영역(132)에 근접할수록 돌출길이가 감소하게 원호를 그리며 연장되게 형성됨으로써 중량이나 충돌방지 측면에서 보다 효과적인 섭동제어데크(130)의 구성이 가능하게 된다(도 5 참조).Both end regions 131 of the perturbation control deck 130 as described above may be formed in a rectangular planar structure having a predetermined protruding length, but the inner surface 131a of both end regions 131 may be formed of the moon pool 100. As the protruding length decreases from the left and right wall surfaces 100c and 100d closer to the center region 132, the protrusion length is formed to be inclined toward the stern side wall surface 100b (see FIG. 4), or the inner surface of the both end regions 131. The closer the 131a is to the central region 132 from the left and right wall surfaces 100c and 100d of the door pool 100, the protruding length decreases and is formed to extend in an arc, so that the perturbation control deck 130 is more effective in terms of weight or collision prevention. ) Can be configured (see FIG. 5).

또한 상기 섭동제어데크(130)에는 드릴파이프나 기타 시추장비와의 충돌 시 충격의 완화를 위한 충격흡수용 코팅층(133)이 더 형성될 수 있으며, 이러한 충격흡수용 코팅층(133)은 섭동제어데크(130)의 내측면에 고무와 같은 탄성재를 부착하거나 또는 우레탄 코팅층을 형성하는 것으로 구성될 수 있다.In addition, the perturbation control deck 130 may be further provided with a shock absorbing coating layer 133 for mitigating impact when colliding with a drill pipe or other drilling equipment, such a shock absorbing coating layer 133 is a perturbation control deck. It may consist of attaching an elastic material such as rubber to the inner side of 130 or forming a urethane coating layer.

도 6은 본 발명에 따른 섭동제어데크가 다수 개로 구성되어 문풀 내에 설치된 상태를 나타낸 측면도를 도시하고 있다.6 is a side view showing a state in which the perturbation control deck according to the present invention is configured in a plurality of door pool installed.

또한 상기 섭동제어데크(130)는 다수 개로 구성될 수 있으며, 다수 개의 섭동제어데크(130)들은 수직방향으로 상호 이격된 구조로 선미측 벽면(100b)에 설치된다.In addition, the perturbation control deck 130 may be configured in plural, and the plurality of perturbation control decks 130 are installed on the stern side wall surface 100b in a structure spaced apart from each other in the vertical direction.

이와 같이 수직방향으로 상호 이격되게 설치되는 다수 개의 섭동제어데크(130)들은 동일한 돌출길이를 갖도록 구성될 수도 있으나, 가장 상단부에 위치한 섭동제어데크(130)의 돌출길이가 가장 길고 하부로 갈수록 돌출길이가 점차적으로 감소하도록 구성되는 것이 바람직하다. 이는 문풀(100)의 하부에서 유입되는 해수의 유동을 돌출길이가 서로 다른 섭동제어데크(130)들이 순차적으로 억제하고, 더불어 최하단부에 위치한 섭동제어데크(130)와 드릴파이프 사이에 충분한 공간을 확보하여 드릴파이프의 충분한 유동공간을 확보할 수 있기 때문이다.
As described above, the plurality of perturbation control decks 130 spaced apart from each other in the vertical direction may be configured to have the same protruding length, but the protruding length of the perturbation control deck 130 located at the top is the longest and the protruding length toward the lower portion. Is preferably configured to gradually decrease. This suppresses the flow of seawater flowing from the bottom of the door pool 100 by the perturbation control decks 130 with different protruding lengths in sequence, and also ensures sufficient space between the perturbation control deck 130 located at the bottom and the drill pipe. This is because a sufficient flow space of the drill pipe can be secured.

도 7은 본 발명에 따른 복합형 문풀 저항 감소 구조가 구비된 문풀 주변의 해수 유동 상태를 나타낸 측면도이다.7 is a side view showing a seawater flow around the door pool equipped with a composite door pool resistance reduction structure according to the present invention.

상기와 같은 구조의 인입형 유동안정화부(110)와 경사부(120) 및 섭동제어데크(130)를 구비하는 드릴쉽은 운항 시, 선수측으로부터 문풀(100)을 향해 유동하는 해수가 인입형 유동안정화부(110)의 내부로 유입되어 S100과 같은 흐름을 형성하면서 문풀(100)로부터 멀어지게 되므로 해수의 유동이 문풀(100)로 유입되는 것을 감소시키게 되고, 선미측 벽면(100b)을 향해 유동하는 해수 중 일부는 경사부(120)에 의해 유도되어 선미측을 향해 그대로 유동하게 되며, 선미측 벽면(100b)을 향해 유동하는 해수 중 나머지 해수의 유동(S110)은 선미측 벽면(100b)에 형성된 섭동제어데크(130)에 의해 차단됨으로써 문풀(100) 내의 유동이 교란되지 않고 안정된 상태를 유지하여 문풀(100)에 의하여 선박의 저항 특성이 저하되는 것을 효과적으로 저감시킬 수 있게 된다.
The drill ship having a retractable oil purifying part 110, an inclination part 120, and a perturbation control deck 130 having the structure as described above, when the seawater flows from the bow side toward the door pool 100 during operation It flows into the interior of the purification unit 110 and is separated from the door pool 100 while forming a flow such as S100 to reduce the flow of seawater to the door pool 100, toward the stern side wall surface (100b) Some of the seawater flowing is guided by the inclined portion 120 and flows as it is toward the stern side, and the flow of the remaining seawater (S110) of the seawater flowing toward the stern side wall surface 100b is the stern side wall surface 100b. By being blocked by the perturbation control deck 130 formed in the door pool 100, the flow in the door pool 100 is not disturbed to maintain a stable state to effectively reduce the degradation of the ship's resistance characteristics by the door pool 100.

본 발명은 상술한 특정의 바람직한 실시 예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위 내에 있게 된다.
It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

<도면의 주요 부분에 대한 부호의 설명>
(100) : 문풀 (110) : 인입형 유동안정화부
(120) : 경사부 (130) : 섭동제어데크
(131) : 양끝단부 영역 (132) : 중앙부 영역
(133) : 충격흡수용 코팅층 (140) : 블록Description of the Related Art
(100): Moonful (110): Pull-out oil purification unit
120: inclined portion 130: perturbation control deck
131: both end regions 132: central region
(133): shock absorbing coating layer 140: block

Claims (7)

문풀(100)의 선수측 벽면(100a)을 형성하는 블록(140)의 저면 일부분을 선체 상부쪽으로 인입가공하여 형성된 인입형 유동안정화부(110);
상기 선미측 벽면(100b)의 하단부를 선미측을 향해 하향 경사지게 가공하여 형성된 경사부(120); 및
상기 선미측 벽면(100b)으로부터 돌출되게 형성되어 문풀(100) 내의 해수 유동을 억제하는 섭동제어데크(130)를 구비하여 문풀(100) 내의 유동 교란을 저감시킨 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.A retractable oil purifying part 110 formed by drawing a portion of the bottom surface of the block 140 forming the bow-side wall surface 100a of the door pool 100 toward the upper portion of the hull;
An inclined portion 120 formed by processing the lower end portion of the stern side wall surface 100b downwardly inclined toward the stern side; And
The door has a perturbation control deck (130) formed to protrude from the stern side wall (100b) to suppress the flow of seawater in the door pool 100, reducing the flow disturbance in the door pool 100, characterized in that Drillship with structure. 제 1 항에 있어서,
상기 섭동제어데크(130)는 문풀(100)의 좌우측 벽면(100c,100d)에 연결된 양끝단부 영역(131)이 나머지 중앙부 영역(132)에 비하여 선미측 벽면(100b)으로부터 보다 더 돌출되게 형성된 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.The method of claim 1,
The perturbation control deck 130 is formed so that both end regions 131 connected to the left and right wall surfaces 100c and 100d of the door pool 100 protrude more from the stern side wall surface 100b than the remaining central region 132. A drillship with a composite door pool resistance reduction structure. 제 2 항에 있어서,
상기 양끝단부 영역(131)의 내측면(131a)은 문풀(100)의 좌우측 벽면(100c,100d)으로부터 중앙부 영역(132)에 근접할수록 돌출길이가 감소하게 선미측 벽면(100b)을 향하여 경사지게 연장된 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.The method of claim 2,
The inner side surface 131a of the both end regions 131 extends inclined toward the stern side wall surface 100b so that the protruding length decreases closer to the central region 132 from the left and right wall surfaces 100c and 100d of the door pool 100. A drillship having a compound door pool resistance reduction structure, characterized in that. 제 2 항에 있어서,
상기 양끝단부 영역(131)의 내측면(131a)은 문풀(100)의 좌우측 벽면(100c,100d)으로부터 중앙부 영역(132)에 근접할수록 돌출길이가 감소하게 원호를 그리며 연장된 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.The method of claim 2,
The inner side surface 131a of the both end regions 131 is extended from the left and right side wall surfaces 100c and 100d of the door pool 100 toward the center region 132 so that the protruding length decreases in an arc. Drillship with type door pool resistance reduction structure. 제 1 항에 있어서,
상기 섭동제어데크(130)의 내측면(131a)에는 충격흡수용 코팅층(133)이 더 형성된 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.The method of claim 1,
The inner side (131a) of the perturbation control deck 130, the drillship having a composite door pulley resistance reduction structure, characterized in that the impact absorption coating layer 133 is further formed. 제 1 항에 있어서,
상기 섭동제어데크(130)는 다수 개로 구성되며,
상기 다수 개의 섭동제어데크(130)들은 수직방향으로 상호 이격되도록 선미측 벽면(100b)에 설치된 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.The method of claim 1,
The perturbation control deck 130 is composed of a plurality,
The plurality of perturbation control decks 130 is a drillship having a compound door pull resistance reduction structure, characterized in that installed on the stern side wall surface (100b) to be spaced apart from each other in the vertical direction. 제 6 항에 있어서,
상기 다수 개의 섭동제어데크(130)들은 하부에 위치할수록 돌출길이가 짧게 형성된 것을 특징으로 하는 복합형 문풀 저항 저감 구조를 갖는 드릴쉽.The method according to claim 6,
The plurality of perturbation control decks 130 are drillship having a composite door pulley resistance reduction structure characterized in that the protrusion length is formed shorter as it is located below.
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CN105015698A (en) * 2015-08-06 2015-11-04 哈尔滨工程大学 Damping device for interior of moon pool of drilling ship
WO2016178574A1 (en) * 2015-05-04 2016-11-10 Gustomsc Resources B.V. A vessel, especially a drillship, provided with a moon pool
CN113184108A (en) * 2021-05-25 2021-07-30 天津大学 Do benefit to pipe laying ship moon pool of drag reduction and optimize structure
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KR101762700B1 (en) * 2015-09-15 2017-07-28 삼성중공업 주식회사 Drillship
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KR20080005021U (en) * 2007-04-25 2008-10-29 대우조선해양 주식회사 Moon pool in ship or marin structure
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WO2016178574A1 (en) * 2015-05-04 2016-11-10 Gustomsc Resources B.V. A vessel, especially a drillship, provided with a moon pool
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US10640172B2 (en) 2015-05-04 2020-05-05 Gustomsc B.V. Vessel, especially a drillship, provided with a moon pool
CN105015698A (en) * 2015-08-06 2015-11-04 哈尔滨工程大学 Damping device for interior of moon pool of drilling ship
CN113184108A (en) * 2021-05-25 2021-07-30 天津大学 Do benefit to pipe laying ship moon pool of drag reduction and optimize structure
CN113232765A (en) * 2021-05-25 2021-08-10 天津大学 Hollow device for reducing additional resistance of moon pool

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