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FPSO全生命周期结构风险研究
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摘要
随着经济快速发展对能源需求的日益增加,开发海洋石油、天然气资源的海洋结构物应用日益广泛。伴随着油气资源开发带来的高收益,海洋结构物的风险和费用问题也日渐突出,这其中包括高昂的海洋结构物设计建造、使用维护、失效费用以及一旦发生事故造成的环境污染、人员伤亡、社会影响等后果。海洋结构物的风险问题一直是人们关注的焦点。
     浮式生产储油船FPSO(Floating Production, Storage and Offloading unit)是目前采用系泊方式作业的一种主要浮式海洋平台,在服役期内需承受恶劣海况下的疲劳、腐蚀损伤,以及可能发生的碰撞、火灾、爆炸等事故对结构造成的不利影响。FPSO一旦失效的严重后果使其风险水平令人关注,因此针对FPSO进行全生命周期内的结构风险研究十分必要,该领域的探索正是目前海洋工程界十分关注的研究方向。FPSO全生命期内面临的结构风险包括多方面内容,本文选择了其中一些关键性的问题以及以往未引起充分关注的问题加以研究,期望更加全面地了解FPSO的结构风险特性,并得到有意义的结论为进一步深入研究和控制FPSO全生命期风险以及保障海洋石油工业生产安全提供基础和依据。本文所开展的主要工作及结论归纳如下:
     首先简要分析了FPSO服役期间可能面临的各种风险以及对FPSO进行全生命期结构风险分析的必要性和意义。而后针对FPSO风险分析中涉及的各个不同领域,介绍了国内外的主要成果和研究进展。
     针对FPSO不同于普通船舶的腐蚀特点,合理选用了腐蚀模型及腐蚀数据库,对所研究FPSO不同腐蚀程度下的极限强度进行了分析。通过构造极限状态方程计算了FPSO系泊服役期间的时变失效概率,明确了腐蚀差异对FPSO船体梁结构风险的影响程度并获得了满足风险准则要求的可服役时间,指出了控制腐蚀对于保证FPSO结构风险处于合理水平的重要意义。对单一载况的平均到达率和环境因子进行敏感性分析,获得其对FPSO结构风险的影响程度。研究结果发现环境因子的差异对FPSO结构风险的影响尤为突出。
     考虑碰撞与腐蚀损伤的共同作用,对不同服役时间发生碰撞后FPSO船体梁进一步破坏的结构风险进行了研究。研究中引入碰撞发生时间的影响,认为碰撞后短时间内FPSO船体梁所承受的载荷仍继续服从原长期分布并据此对FPSO船体梁破损后仍处于系泊状态阶段的载荷组合方式进行了改进。研究区分了中剖面遭受破坏及其它部位发生破损对船体梁相应失效概率所产生的影响。计算结果反映出全面考察各个压载舱发生破损可能造成后果的必要性以及不同腐蚀模型与腐蚀数据库之间差异对碰撞损伤后结构风险水平造成的不同影响程度。结合剩余极限强度的余度指数,根据失效概率尝试提出了适用于碰撞损伤后短时期内仍处于系泊状态的FPSO船体梁结构风险接受准则。
     考虑拖航速度、海况、FPSO自身状态(包括腐蚀状态以及结构完整性)等因素的影响,分别对全新状态入役、老龄状态退役以及碰撞损伤后返厂修理情况下的FPSO经受短期风暴作用时的船体梁结构风险进行评估。研究中引入了腐蚀损伤的作用,充分考虑了退役时间以及碰撞发生时间对拖航失效概率造成的影响,更加全面地反映出FPSO船体梁全生命期内的结构风险水平。所得结果反映出有义波高是影响拖航结构失效概率的最显著因素。以失效概率为基础,获得了不同条件下满足风险接受准则要求的最大允许有义波高,并将其作为判断FPSO船体梁拖航状态结构风险水平的辅助决策指标。
     考虑检测结果对先验分布的更新作用,将基于风险的检测维护理论应用于FPSO腐蚀损伤的控制与费用优化。选取不同部位的船体板,在不同腐蚀程度、检测水平和失效接受准则条件下分别制定了检测规划,并根据费用优化的思想对各种组合情况下的总的期望费用、失效费用、检测费用以及维护费用进行了计算。通过对多种影响费用的因素进行分析讨论,可以发现受评估部位、腐蚀程度、失效接受准则、检测水平、维护准则等多种因素的影响,总的期望费用变化规律非常复杂,无法采用统一的规律概括所有构件的检测维护规划。这证明了对FPSO不同构件分别开展检测维护规划研究的必要性。同时结果显示腐蚀情况的恶化直接对检测维护规划费用存在不利影响,在今后的研究中考虑不同防腐措施的作用将设计建造费用纳入整个规划的费用优化计算是更加合理的。
     对FPSO检测维护规划开展进一步的优化研究。通过提出改进的检测时间选择模型,获得了检测时间的备择集,计算了新模型下检测时间对应的总的期望费用。结果表明,研究中提出的优化方法所得检测时间下总的期望费用低于以往规划制定方法的费用值,有利于避免不必要的费用支出。依据最优检测时间,对不同条件下的最优失效接受准则进行了分析,对不同检测水平以及腐蚀程度带来的费用差异进行了讨论。研究还围绕实际工程中检测到缺陷的情况对不同部位受缺陷尺寸影响所造成的费用差异进行了探讨,验证了基于风险的检测维护规划方法的实用性。缺陷尺寸增大导致费用显著增长的现象再次证明了合理控制腐蚀对降低费用的重要性。同时费用数据指出了超期服役可能面临的不经济局面,为业主根据具体情况在FPSO超过设计寿命期后作出维护或退役决策提供参考依据。
With the increasing demand on energy resource stimulated by fast development of economy, offshore structures are widely used to explore ocean oil and gas resource. Accompanying with considerable benefits from exploitation, the problems of risk and cost relevant to offshore structures are becoming more and more prominent, which include the exorbitant cost of design, construction, service, maintenance and failure, and sequential environmental pollution, fatal loss and social impact caused by accident. The risk of offshore structure is always concerned by people.
     FPSO (Floating Production, Storage and Offloading unit) is one of the main floating platforms positioned by mooring system. During its service, FPSO has to endure fatigue and corrosion damage under severe sea state. Possible accidents, such as collision, fire and explosion, etc., will affect structure adversely. The serious consequence aroused by the failure of FPSO by any possibility makes the risk level focused. Therefore, it is necessary to evaluate the structural risk of FPSO during its lifetime, which is also the research project concerned by offshore industry recently.
     The structural risks of FPSO during lifetime include many aspects. Some key points and those problems neglected before are selected to be studied in order to learn characteristics of structural risk of FPSO generally and get useful results for further research and control on risk of FPSO during its lifetime, which benefits to secure the safety of offshore industry. The summary of main research works and results are listed below:
     Firstly, the possible risks of FPSO during lifetime are analyzed briefly and the necessary and meaning of evaluating them are introduced. The latest domestic and international progresses are summarized according to different aspects of risk analysis of FPSO.
     Considering the corrosion difference between FPSO and merchant ships, proper corrosion model and database are selected to calculate the ultimate strength of FPSO based on different corrosion level. Time-variant probabilities of failure of FPSO hull girder in mooring condition are calculated based on limit state function. The available service years corresponding to different corrosion level are worked out to reflect the influence of corrosion on FPSO structural safety, which emphasize the importance of controlling corrosion to maintain the risk level of FPSO. The sensitivity of arrival rate of a single loading condition and environmental factor are analyzed. It is obvious that the environmental factor has great effect on the structural risk of FPSO.
     Taking damage of collision and corrosion into account together, the structural risk of damaged FPSO hull girder are evaluated when collision takes place at different service year. The loads of damaged FPSO still follow former long-term distribution within short period after collision because the time of collision occurrence is considered as a factor in this study. Therefore, the loads combination of damaged FPSO hull girder which is still in mooring condition after collision is adjusted. The probabilities of failure of FPSO hull girder are calculated separately based on different locations of damage due to collision, which are mid section of FPSO and other sections. The results show the necessary of evaluating all possible consequences, which can be caused by damage of each ballast tank. The results also show the difference of structural risk levels after collision induced by different corrosion model and database clearly. Combined with residual strength index, risk acceptance criteria of FPSO hull girder, which is still in mooring condition within short period after collision, is presented based on calculated probability of failure.
     Taking some factors into account, such as towing speed, sea state, FPSO structure condition (including corrosion state and hull integrity), etc., the structural risk of FPSO is analyzed when it encounters a short-term storm under towing condition. Three possible structure conditions of towed FSPO are considered, which are new-built intact condition, retirement condition and collision damage condition, respectively. Time of retirement and collision occurrence is taken into account when calculating probabilities of failure under towing condition, which can reflect the structural risk levels of FPSO during lifetime more generally since corrosion damage effect is introduced into calculation. It can be found that the significant wave height is the most prominent factor to probabilities of failure under towing condition. Acceptable maximum significant wave heights satisfying risk acceptance criteria are derived according to different situations, and are taken as decision-making index to estimate structural risk level of FPSO hull girder under specific towing condition.
     Since inspection result can update prior distribution, risk based inspection and maintenance theory is applied on FPSO corrosion damage control and cost optimization. Hull girder plates at different location are selected to make inspection schedule according to various combinations of corrosion extents, inspection levels and failure criteria. Then corresponding total expected costs, failure costs, inspections costs and maintenance costs are calculated based on demand of cost optimization. After comparing result of costs, it can be found that the variation of total expected costs is too complicated to be summarized as uniform rule to describe all structure components. It is caused by many factors, such as component location, corrosion extent, failure criteria, inspection level and maintenance criteria, etc. This phenomenon proves the necessary of inspection and maintenance study on different FPSO components. Obviously, deterioration of corrosion extent has unfavorable effect on costs. It is reasonable to bring design cost into cost optimization of whole schedule in further research by choosing different anti-corrosion methods at design stage.
     Further optimization on FPSO inspection and maintenance schedule is carried out. Improved model for selecting inspection time is presented to derive congregation of optional inspection time. And costs corresponding to new model are calculated, consequently. It can be seen that the inspection time achieved from new model has lower costs than former schedule, which is benefit to avoiding unnecessary expenditure. Based on derived optimized inspection time, optimized risk acceptance criteria are analyzed according to different conditions and the differences of costs distinguished by inspection level and corrosion extent are also discussed. The difference of costs induced by dimension of defects detected on various components in industrial application is analyzed, which proves the practicability of risk based inspection and maintenance method. The costs rise with increase of dimension of defects, which emphasizes the importance of controlling corrosion to reduce costs again. The data of costs shows the probable uneconomical situation of FPSO during its overage service, which is helpful to make maintenance or retirement decision for owners when FPSO exceeds its designed service life.
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