• Journal of Computational Design and Engineering
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• 제1권3호
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• pp.173-186
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• 2014

The failure of a subsea production plant could induce fatal hazards and enormous loss to human lives, environments, and properties. Thus, for securing integrated design safety, core source technologies include subsea system integration that has high safety and reliability and a technique for the subsea flow assurance of subsea production plant and subsea pipeline network fluids. The evaluation of subsea flow assurance needs to be performed considering the performance of a subsea production plant, reservoir production characteristics, and the flow characteristics of multiphase fluids. A subsea production plant is installed in the deep sea, and thus is exposed to a high-pressure/ low-temperature environment. Accordingly, hydrates could be formed inside a subsea production plant or within a subsea pipeline network. These hydrates could induce serious damages by blocking the flow of subsea fluids. In this study, a simulation technology, which can visualize the system configuration of subsea production processes and can simulate stable flow of fluids, was introduced. Most existing subsea simulations have performed the analysis of dynamic behaviors for the installation of subsea facilities or the flow analysis of multiphase flow within pipes. The above studies occupy extensive research areas of the subsea field. In this study, with the goal of simulating the configuration of an entire deep sea production system compared to existing studies, a DES-based simulation technology, which can logically simulate oil production processes in the deep sea, was analyzed, and an implementation example of a simplified case was introduced.

• 한국해양공학회지
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• 제27권3호
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• pp.1-7
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• 2013

The purpose of this study was the implementation of a simulation for a subsea production system. This subsea production system is installed under environments with high pressure and low temperature. Most of the processes for oil and gas production occur in the subsea equipment. Therefore, an understanding and study of subsea production systems is very difficult because people cannot directly observe the processes occurring in the subsea production system. A simulation system can be a useful solution for this difficult problem. In this research, information models and a 3-D graphic model of the subsea equipment were built using the object-oriented technology and 3-D CAD. The entire system was implemented with the help of simulation software, 3-DVIA Virtools. The simulation system for the subsea production system was tested using several production process scenarios. The results of the tests showed that the simulation system is very useful for understanding a subsea production system and could be a good educational tool.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제14권2호
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• pp.113-121
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• 2014

A subsea oil production system must be safely operated for 20-30 years after being installed. Because of the severe conditions of the subsea environment, such as extreme high pressure, low visibility, the possibility of unexpected impact by any object, and corrosion by seawater, subsea oil production systems should be monitored by subsea data logger systems and remotely operated vehicles to check for abnormal vibration and leakage to prevent a catastrophic accident. Because of the severity of subsea environmental conditions and the dominance of a few companies in the market, many people have thought that it would be difficult to develop a subsea data logger system. The primary objectives of the study described in this paper were to analyze existing subsea data logger systems to establish the requirements for a subsea data logger system, implement a prototype subsea data logger system, and conduct a test of the prototype subsea data logger system.

• 한국해양공학회지
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• 제27권3호
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• pp.85-90
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• 2013

The growing need for energy (oil and gas) has led to offshore resource development. As a reflection of this trend, there have been many advances in the technologies used for the subsea production systems that make offshore resource development possible. As the technologies for subsea production systems continue to grow, a subsea X-mas tree, the core equipment in a subsea production system, is required to have more functions than before. Generally, these complex functions lead to a change in its configuration. Therefore, this paper investigates a change in a subsea X-mas tree system to enhance system understanding, and conducts a leakage path analysis of a subsea X-mas tree system. Utilizing the recent configuration of the subsea X-mas tree, an identification of the leakage path and a quantitative risk analysis for the leakage using an FTA (fault tree analysis) are conducted.

• Journal of Advanced Marine Engineering and Technology
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• 제38권2호
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• pp.162-168
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• 2014

Recently, researches on all-electric subsea system have been in progress. This paper describes a subsea tree using a lot of electrical signal and subsea control system. The way of subsea control is classified as all-electric systems or electro hydraulic systems. One of that has more merits in terms of cost, weight, power consumption, etc. because it uses electric signal instead of hydraulic signal. This paper describes the difference of each system's power consumption and simulation. As the result, if each system applies the same number of sensors, actuators, etc. The power consumption of all-electric system's load is less than at least 400kWh/day compared to the electro hydraulic system load.

• 대한조선학회논문집
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• 제49권4호
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• pp.340-349
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• 2012

The mitigation of gap between technology and it's applicability in the oil and gas industry has led to a rapid development of deepwater resources. Historically, subsea wells have good track records. However, an ever increasing water depths and harsher environments being encountered are currently posing challenges to subsea production. Complex subsea systems are now being deployed in ways rarely encountered in previous development schemes. These increasingly complex systems present a number of technical challenges. This study presents the challenges in subsea production systems, considering the technical and safety issues in design and installation associated with current development modality.

• 한국해양공학회지
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• 제27권2호
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• pp.47-52
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• 2013

A subsea chemical injection system treats blockage problems in a subsea production system. It is important to treat problems quickly, because production delays cause fatal profit losses in a subsea production system. Therefore, the subsea industry requires a relatively higher reliability level for a production system compared to other industries. In this study, a subsea chemical injection system (linked to a control system) to inject chemicals into a subsea X-mas tree was analyzed. By using FSA (Formal Safety Assessment), the risk factors were defined and a quantitative risk analysis utilizing FTA (Fault Tree Analysis) and ETA (Event Tree Analysis) was performed. As a result, the effectiveness of a risk reduction option was evaluated.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2013년도 춘계학술대회
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• pp.548-550
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• 2013

해양 석유 가스생산의 증가로 해저장비 시장이 급속하게 확대되고 있다. 해저 장비 중 Subsea Tree는 핵심적인 기자재이나 현재 기술의 안정성은 미흡한 상황이다. Subsea Tree는 기술개발 완료 시 독점적 이윤이 확보 가능하고 우리나라 해양플랜트 업체의 해상설비 설계기술과 결합하여 패키지 확보에 기여할 수 있다. 특히 국내업체가 확보한 광구에 설치 시 최소 5천억 원의 수입대체효과가 발생할 수 있다. 본 연구에서는 Subsea Tree의 국산화 기술개발 현황 및 성과와 더불어 이에 대한 사업화 전략의 수립에 대해 살펴보고자 한다.

• 지질공학
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• 제24권4호
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• pp.455-461
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• 2014

The Honam-Jeju, Korea-Japan, and Korea-China subsea tunnel construction projects have drawn significant attention since the early 2000s. These subsea tunnels are much deeper than most existing natural shallow sea tunnels linking coastal areas. Thus, the need for developing new technologies for the site selection and construction of deep subsea tunnels has recently emerged, with the launch of a research project titled "Development of Key Subsea Tunnelling Technology" in 2013. A component of this research, an analysis of deep subsea geological structure, is currently underway. A ground investigation, such as a borehole or geophysical investigation, is generally carried out for tunnel design. However, when investigating a potential site for a deep subsea tunnel, borehole drilling requires equipment at the scale of offshore oil drilling. The huge cost of such an undertaking has raised the urgent need for methods to indirectly assess the local geological structure as much as possible to limit the need for repeated borehole investigations. This study introduces an indirect approach for assessing the geological structure of the seafloor through a submarine bathymetry analysis. The ultimate goal here is to develop an automated approach to the analysis of submarine geological structures, which may prove useful in the selection of future deep subsea tunnel sites.

• 한국건설관리학회논문집
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• 제18권4호
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• pp.36-47
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• 2017

대표적인 국내 해저터널 시공사례로 침매공법을 적용한 가덕 해저터널이 완공되어 운영 중이고, NATM 공법을 적용한 보령~태안간 해저터널이 건설중이다. 호남~제주 간 고속철도 해저터널이 구상중 이고, 일본, 중국과도 해저터널 건설에 대한 타당성이 검토되고 있다. 그러나 Shield TBM 공법을 적용한 해저터널에 대한 국내 시공사례가 없어, 현재의 기술력으로는 장대 해저터널 사업성 분석 및 적정 공사기간 예측 등 공사수행을 위한 공정계획정보 제공이 어렵다. 경제성 등 이유로 정부기관 및 발주기관도 Shield TBM 공법 적용에 소극적이고, Shield TBM 공법을 적용한 공정관리분야 기술적 자료도 부족한 실정이다. 따라서, 장대 해저터널 사업성 분석 및 적정 공사기간 예측하기 위한 표준공정관리체계가 필요하다. 본 연구를 통해 WBS, Network Diagram, 단위 공사기간 산출모델 등 해저터널 표준공정관리 체계를 제시하므로써, 장래 건설되어질 해저터널 사업에 기술적, 경제적으로 기여하고자 한다.