Floating photovoltaic platform is recognized as one of the most potential technology development direction in the industry. How to maintain the strength and stability of the structure under harsh marine environmental conditions is of great significance for the development and application of far-reaching marine solar energy. Based on practical engineering, a hexagon truss type floating photovoltaic platform is designed in this paper, which uses buoyancy block to provide buoyancy and adopts a 6 × 1 spread mooring system. The whole platform has the advantages of small waterplane, stable platform desirable motion response and small mooring tension. Firstly, an integrated numerical model of truss-buoyancy block and mooring system is established in commercial software OrcaFlex, subsequently the dynamic coupling calculation is carried out in the full-time domain, and the platform’s motion response and mooring tension characteristics under extreme sea conditions with high/low tide levels are investigated, respectively. The results show that the platform has excellent hydrodynamic performance as well as the tension on mooring chains is small, which can maintain stable operation under extreme sea conditions. The analysis and results can provide important reference for practical engineering.
The scale parameters of bubbles produced by underwater exhaust influence the effect of the acoustic insulation. According to the dynamic characteristics in the process of underwater exhaust and the design criteria of equal flow per unit area, the two-dimensional equation of underwater exhaust was established. The analytical expressions of the orifice position and geometric parameters of the two-dimensional underwater exhaust device were obtained. The finite element models were established to compare the two vent patterns of uniform distribution and fixed orifice spacing / variable orifice area distribution. The exhaust effect was verified by circulating flume test. The simulation and experimental results show that the fixed orifice spacing and variable orifice area distribution mode can effectively control the distribution of bubbles scale parameters, and enhance the acoustic insulation effect of bubbles.
To ensure the safety of transportation of heavy cargo by sea,it is necessary that the cargo be lashed and secured,in which the calculation of the inertial acceleration of the cargo is an important prerequisite for the strength analysis of lashing configurations.This paper,by taking a transport ship as the research object and using the hydrodynamic prediction method,obtains the inertial acceleration of the quay crane,and considers the wind load acting on the crane.It conducts finite element analysis of the lashing strength under typical working conditions.The calculation results show that the structural strength of the lashing configurations meet the requirements.The research method proposed this paper has a certain reference value for the lashing analysis of similar goods.
The deepwater semi-submersible production and storage platform undertakes the oil and gas development,storage,and transportation of Lingshui 17-2 Gas Field.The complex building structure inside the platform and the densely deployed electronic equipment increase the probability of emergencies such as fire and flooding,and increase the difficulty of evacuating platform operators and fire rescue.When an emergency occurs on the platform,the location of operators can be located to improve the rescue efficiency.Based on the ultra-low power consumption RSSI-based Bluetooth positioning algorithm,this paper designs an efficient and stable personnel positioning system for the above platforms.Through the visual interface,the central control system can realize realtime positioning of platform operators and the management of the personnel and platform.In case of an emergency,it can ensure the life safety of platform operators and improve the safe operation and maintenance of the platform.
This paper designs a kind of deepwater pipeline recovery tool（PRT）,including claws,the center structure,the hydraulic cylinder,the adjustable limitation thimble,integrated valve,and the remotely operated vehicle（ROV）hot stab.It also performs finite element analysis after structure design and hydraulic principle design.This equipment can be used to the recovery of submarine pipelines with different diameters,successfully solving the technical problems of deepwater submarine pipeline recovery,and promoting the development of equipment and technology in offshore oil engineering.
Big capacity refrigerator should be used during the design of large heat dissipation electric equipment room in offshore platforms,which has a high equipment cost and operating cost.A novel design method of independent ventilation and special duct is proposed.Taking the electric room of an offshore platform as an example,the cooling capacity of air conditioning required by the new design method is reduced by 67.5% in summer compared with the traditional design method,and the indoor temperature can be adjusted by adjusting the damper in winter,which can not only save equipment investment,but also reduce onsite noise,achieving the purpose of energy conservation and emission reduction.
本文对全球首艘10万吨级深水半潜式生产储油平台"深海一号"能源站的压排载系统的设计过程和要点进行了阐述.通过分析船级社规范对柱稳式半潜平台压排载系统的设计要求,结合项目本身结构特点和应用需求,对"深海一号"压排载系统进行展开式的分析和破损稳性模拟计算,证明系统在满足船级社规范的前提下,能实现多个压载舱同时压排载或倒舱并提高排载泵的吸入性能,且双环网把4个节点的排载泵连接起来,较传统单环网设计大大提高了系统冗余度和安全性.
With the depletion of land and shallow sea oil and gas resources,deepwater has become an important connection area for oil and gas supply,and the application of deepwater underwater facilities has increased.Underwater installation engineering is an important link in the construction of deepwater oil and gas field development engineering.The increase of water depth demands higher requirements for the underwater installation of ship equipment and technical capacity.Improving the ship equipment and installation technical capacity can effectively improve the operation efficiency.By summarizing the characteristics of deepwater underwater installation engineering,this paper proposes the concept of “moving design forward ”and “providing miscellaneous provisions at sea ”in practice,introduces the ability improvement of deepwater engineering vessel equipment and the ability improvement and practice of key core technologies of deepwater underwater installation for deepwater oil and gas field development projects such as Liuhua 29-1,Liuhua 29-2,Liuhua 16-2,and Lingshui 17-2,and proposes suggestions for future development.It is expected to provide reference for the development of deepwater resources in China in the future.
实时监测和预警管理是深远海浮式生产平台安全运营的重要安全保障措施.本研究针对作业于中国南海1500 m水深陵水气田的"深海一号"半潜式生产储油平台,完成了平台性能预警管理系统研究,主要包括监测参数选取、阈值确定、警示发布、风险识别以及应对措施推荐等主要环节.区别于传统的单一绝对阈值设定方式,本系统提出并应用了基于实测的环境参数动态阈值确定方法.在软件实现上,基于预警管理系统的功能需求,搭建了系统框架,设计了数据库和核心分析模块逻辑结构,自主开发了一体化浮式平台总体性能预警管理系统软件,并将其安装于实际平台上进行示范应用.
Based on the CEPD of JZ9-3,in view of the risk of collision between the traditional construction technology and the gantry crane,and by comparing the advantages and disadvantages of the two construction methods,it was finally determined to apply the method of row-up lifting method for the final assembly of the module,which effectively avoided the risk,improved the efficiency of construction and final assembly,avoided upgrading the detailed design and changing the construction site,and saved the project construction cost.This method provides reference for future similar project.
In the deep sea,the semi-submersible platform will produce six degrees of freedom motion under the action of environment,which will have an adverse impact on platform operation.Therefore,it is of engineering significance to accurately predict the motion response of the platform in a short time.At present,the popular model of the time series prediction method based on neural network is the long short-term memory（LSTM）network.Aimed at the problems of many parameters and large amount of calculation of the LSTM network,an extreme short-time prediction method of semi-submersible platform motion based on the temporal convolutional network（TCN）model is proposed in this paper,which,taking the semi-submersible platform model as the research object,applies the TCN to the prediction of time series,selects the wave conditions with a 100 year return period and a 1000 year return period,and predicts the heave motion of the semi-submersible platform with an advance of 0,5s,and 10s.A comparison of the prediction results of the TCN model and the LSTM network model shows that the structure of the TCN model is simpler but achieves the similar prediction accuracy as the LSTM network model.Therefore,the method proposed in this paper is feasible.
The harsh operating environment of the deepwater semi-submersible platform poses severe challenges to its safety and economy,and the use of digital and intelligent technologies to improve the operation and maintenance level of large-scale marine engineering equipment has become an inevitable trend.Taking “Deep Sea No.1”,the first deepwater production platform in the South China Sea,as the research object,this paper proposes the overall architecture of the intelligent operation and maintenance system supported by digital twins and machine learning as the core support,develops system function modules,and realizes the application of intelligent prediction and online status visualization functions based on measured data,providing a feasible technical route for the realization of China’s digital oilfield strategy.
The flow assurance technology has become one of the key technologies restricting the development of deepwater oil and gas fields and long-distance transportation.This paper provided an overview of the overall progress of the flow assurance technology in deepwater oil and gas fields.It elaborated on the research progress in China in terms of the flow assurance design technology,the solid deposition prediction and prevention technology,the flow monitoring and detection technology,and the flow management technology.In addition,it proposed constructive suggestions for the development direction of flow assurance technology in deepwater oil and gas fields.
The offshore installation technology of the deepwater semi-submersible oil and gas production platform is one of the key technologies for China’s oil and gas industry to approach the deep sea.Due to the characteristics of the large scale,high center of gravity,weak structural strength and so on,the load-out operation of the super large plate and shell floating structure under the semi-submersible platform such as the hydraulic winch,strand jack,self-propelled module transport vehicle and other loading equipment that have been widely used in China can no longer meet the operational requirements.Lingshui 17 2 Gas Field Development Project,according to the characteristics of the project,rented the internationally mature hydraulic boot system,independently developed the supporting load-out technology,and successfully implemented the lateral skidding load-out of the ship under the 33500 ton semi-submersible platform of the project.This paper systematically introduces the design and construction process of the large-scale structure lateral slip loading using the hydraulic boot system,which is designed to provide guidance for similar projects.
With increasingly stringent emission standards,and aimed at the pollution caused by ships sailing in inland rivers and coastal areas,the development of a hybrid propeller system and power supply system consisting of a shaft generator and battery pack can achieve the goals that the ship can use battery pack to propel within the emission control area,that the ship can use hybrid propulsion to realize energy conservation and emission reduction,that the diesel engine can drive shaft generator to generator electricity,and that the shore power can be connected to the grid.The hybrid system proposed in this paper can achieve zero pollution emission in the emission control area,which is more fuel and cost effective than the traditional propulsion and power supply system,effectively solving the problem of excessive emission of ships.
In order to avoid the risk of radiation,there is a large number of process piping in the offshore platform which need to be inspected by radiographic testing.At present,the safe,efficient and pollution-free phased array inspection technology is often used to the contour shape,which,however,cannot be performed in pipe fitting phased array ultrasonic test（PAUT）inspection.Only one-sided scanning can be performed at the pipe side,which,generally is not accepted because of the risk of missing inspection.In this paper,double side scanning is performed for 4 inch 6.02mm pipe to elbow by reverse installed phased array probe.
Aimed at TLP mooring security under the influence of multiple factors,and taking the traditional TLP as the object,a TLP numerical analysis model is established,and the time-domain coupling analysis of TLP is completed.The calculation results under normal operation,extreme,and survival conditions,as well as those considering the influence of high and low tide levels and other factors are obtained by time domain coupling analysis.The calculation results show that the maximum and the minimum tension meet the design requirements,based on which,the effects of VIM and VIV on the tension of the tension leg are studied.The results show that the vortex induced motion has a great influence on the tension of tension legs perpendicular to the environmental load,and the impact of VIV on the tension of the tension leg can be ignored.The calculation results and analysis methods proposed in this paper can provide reference for engineering design.
With the increasing energy demand in the economic construction and development of China,offshore oil and gas development has gradually stepped into the deepwater field.Different from the traditional offshore oil and gas field development mode,deepwater production system has become the key technology of development with its low investment cost,short development cycle,and high production benefit.The subsea multi-function manifold is equipped with the control system,which has the function of collecting and transporting production media and realizing photoelectric conversion.It is the core equipment of deepwater oil and gas development.This paper focused on the equipment design,manufacture,testing and engineering product certification of subsea multifunctional manifold and some core equipment.Based on the products developed by independent technical breakthrough and demonstration application,the development cost of the same type of product is reduced by 20%,and the locolization rate is more than 85%,which is of great value for engineering demonstration and popularization and application.
本文介绍一种通过在靠近海底触地点的弯曲段增加惯性力来改善深水钢悬链线立管运动性能的方法,达到显著降低弯曲段的极限应力和疲劳损伤的目的.在弯曲段增加的惯性体,来自立管顶端浮体的动能经过惯性体的吸收和耗散以后,进一步传递到敏感的立管触地点的能量大为降低,从而改善钢悬链线立管,尤其在弯曲段的运动特性,最终降低触地点附近立管的应力、减少疲劳.本文采用有限元单元CABLE3D对惯性体的设计进行数值模拟.惯性体的引入可以有效地增加浮体运动和立管弯曲段运动的解耦,以低成本的方式使本不适用的简单钢悬链线立管通过在弯曲段增加惯性体来改善其运动性能,从而达到适用标准.
目前,吸力锚在浅海和深海范围内被广泛使用,但仍属于较新的基础类型.随着深海油气开发和海上风电等海洋工业的进一步发展,对吸力锚基础的建造技术研究显得愈发重要.本文结合吸力锚的工作原理和组成部件特点,对直径4.5～10m、高度10～24m的吸力锚建造工艺和建造技术进行研究.文中分析了不同功能吸力锚的总装工艺及建造技术关键点.研究结果表明,建造过程中应在材料、尺寸、焊接等关键点进行风险识别和执行严格的过程控制有利于保证吸力锚的建造质量.
