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Floating Production Platforms and their Applications in the Development of Oil and Gas Fields in the South China Sea

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Journal of Marine Science and Application 2014年第1期13卷 67-75页

作者： dagang zhang Yongjun Chen Tianyu zhang DMAR Engineering Inc. Beijing DMAR Ocean Tech Inc.

This paper studies the current available options for floating production platforms in developing deepwater oil fields and the potential development models of future oil and gas exploration in the South China Sea. A detailed review of current deepwater platforms worldwide was performed through the examples of industry projects, and the pros and cons of each platform are discussed. Four types of platforms are currently used for the deepwater development: tension leg platform, Spar, semi-submersible platform, and the floating production system offloading. Among these, the TLP and Spar can be used for dry tree applications, and have gained popularity in recent years. The dry tree application enables the extension of the drilling application for fixed platforms into floating systems, and greatly reduces the cost and complexity of the subsea operation. Newly built wet tree semi-submersible production platforms for ultra deepwater are also getting their application, mainly due to the much needed payload for deepwater making the conversion of the old drilling semi-submersible platforms impossible. These platforms have been used in different fields around the world for different environments; each has its own advantages and disadvantages. There are many challenges with the successful use of these floating platforms. A lot of lessons have been learned and extensive experience accumulated through the many project applications. Key technologies are being reviewed for the successful use of floating platforms for field development, and potential future development needs are being discussed. Some of the technologies and experience of platform applications can be well used for the development of the South China Sea oil and gas field.

关键词： floating platform deepwater development oil fielddevelopment deepwater technology platform host

New technology opens the door for deepwater development

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Engineering Sciences 2011年第1期9卷 7-12,75页

作者： zhang dagang Deepwater Engineering ＆ Technology Research Center Harbin Engineering University Harbin 150000 China

The paper provided an updated status of technology for deepwater field development, demonstrated the importance of its application through actual project example, and discussed some future technical development trends. The focus was on the floating structures. By reviewing some of the engineering aspects of the project, the technology advancement, innovations and challenges in offshore engineering were discussed and demonstrated. The author’s view of technical challenges facing deepwater forwarding was discussed, which covered water depth limitations, new material application, installation methods, riser development and operational issues. An overview of technologies that will enable deepwater projects to be extended into new frontiers was presented.

关键词： deepwater exploration field development frontier technology floating structure tender assisted drilling

Response-based Analysis for Tension Leg Platform

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Journal of Marine Science and Application 2017年第1期16卷 87-92页

作者： Yongjun Chen dagang zhang DMAR Engineering Inc. Houston Texas 77094 USA

The typical industry practice for Tension Leg Platform （TLP） design focuses on a conventional short-term design recipe, which assumes that an N-year design environment leads to an N-year response. In the response-based design method, the TLP is designed to withstand N-year responses rather than respond to N-year environmental conditions. In this paper, we present an overview and a general procedure for the response-based design method and use a case study to compare the critical TLP responses between the two methods. The results of our comparison show that the conventional short-term design method often contains an element of conservatism and that the response-based design method can reduce the design conditions and thereby achieve cost savings.

关键词： response-based design long-term response short-term response deepwater floating platform tension leg platform

Tension leg platform project execution

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Engineering Sciences 2013年第4期11卷 79-85页

作者： zhang dagang Wang Chunsheng zhang Tianyu DMAR Engineering Inc. China National offshore Oil Corporation (CNOOC) Research Institute

The first floating platform concept design work for South China Sea is undergoing in DMAR's office now. This tension leg platform has potential to become the first advanced floating production platform project. Project execution is always a challenge for floating system. This paper focuses on the critical elements of project execution for tension leg platform,and studies potential implications to future oil and gas exploration in South China Sea. There are many factors affecting successful execution of floating system project,including technical issues, engineering management,interface management,etc. There are also failure examples of project execution in the industry. The author has participated 28 large detailed projects and has gained extensive experience on floating projects,with ample hands-on project experiences. A detailed tension leg platform project study example and discussions in depth are presented for future project execution in China deepwater development.

关键词： project execution deepwater project tension leg platform floating system project management

Deepwater oil and gas field development in South China Sea

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Engineering Sciences 2013年第4期11卷 2-9页

作者： zhang dagang Wybro Pieter Kang Yongtian DMAR Engineering Inc. Independent Contractor Former President of Sea Engineering Inc.

This paper focuses on potential development models of future oil and gas exploration in South China Sea. A detailed study of current development models worldwide is performed through some examples of industry installed/ongoing projects and major technical issues encountered during these practice. Key technologies are discussed for the success of field development. Some of the technologies and field development experience can be used for South China Sea project. Several models are studied in field development for different scenarios,including marginal field,large oil field and gas field. With the massive investment activities,continued improved technologies,and rapidly growing pool of professionals,the offshore industry in China will soon encounter a golden period.

关键词： field development deepwater exploration development model deepwater technology combinedsystem

Application of a Newly Built Semi-submersible Vessel for Transportation of a Tension Leg Platform

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Journal of Marine Science and Application 2012年第3期11卷 341-350页

作者： dagang zhang WeiyingSun Zhixia Fan DMAR Engineering Inc. 15915 Katy Freeway Houston TX 77094 USA China Offshore Oil Engineering Corporation Tianjin 300452 China

Transportation of tension leg platform （TLP） structures for a long distance has always been associated with the use of a heavy semi-transport vessel. The requirements of this type of vessel are always special, and their availability is limited. To prepare for the future development of South China Sea deepwater projects, the China Offshore Oil Engineering Corporation has recently built a heavy lift transport vessel-Hai Yang Shi You 278. This semi-submersible vessel has a displacement capacity of 50k DWT, and a breath of 42 meters. Understanding the vessel＇s applicability and preparing it for use in future deepwater projects are becoming imminent needs. This paper reviews the current critical issues associated with TLP transportation and performs detailed analysis of the designed TLP during load-out and transportation. The newly built COOEC transportation vessel HYSY 278 was applied to dry transport of the TLP structure from the COOEC fabrication yard in Qingdao to an oil field in South China Sea. The entire process included the load-out of the TLP structure from the landsite of the fabrication yard, the offloading and float-on of the platform from the vessel, the dry transport of the TLP over a long distance, and the final offloading of the platform. Both hydrodynamic and structure analysis were performed to evaluate the behavior of the transport vessel and TLP structure. Special attention was paid to critical areas associated with the use of this new vessel, along with any potential limitations. The results demonstrate that HYSY 278 can effectively be used for transporting the structure with proper arrangement and well-prepared operation. The procedure and details were presented on the basis of the study results. Special attention was also given to discussion on future use based on the results from the analysis.

关键词： dry transport HYSY 278 tension leg platform (TLP) structure heavy semi-submersible transportvessel floating structure

Effect of fatigue load on the bending tribo-corrosion-fatigue behaviors between the main cable wires

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Friction 2024年第7期12卷 1512-1531页

作者： Bo WANG dagang WANG Jihong YE Liang TANG Hailang CHONG Wei XU Xinxin zhang Jianhao CHEN Haiyan DENG Jie zhang Guowen YAO Magd Abdel WAHAB School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Xuzhou Key Laboratory for Fire Safety of Engineering Structures China University of Mining and TechnologyXuzhou 221116China National Wire Rope Quality Inspection Center Nantong Product Quality Supervision and Inspection InstituteNantong 226011China Jiangsu Langshan Wire Rope Co. Ltd.Nantong 226003China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Civil Engineering Chongqing Jiaotong UniversityChongqing 400074China Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityZwijnaarde B-9052Belgium

The main cable bent around the saddle of the suspension bridge is subjected to the wind,the vehicle,the bridge’s own weight and the corrosive *** coupling of the three loads and the environments causes the friction,the corrosion,and the fatigue(tribo-corrosion-fatigue)among the wires inside the main *** this paper,a wire bending tribo-corrosion-fatigue test rig was designed and *** effect of fatigue load on the bending friction behaviors between the cable wires in ultrapure water and 3.5%NaCl solution was *** tribological properties and electrochemical corrosion behaviors under different fatigue loading ranges were *** tribo-corrosion-fatigue interaction between the cable wires was quantitatively characterized,and the mechanism of the interaction was *** results demonstrate that the increasing fatigue load exacerbates the coupling damage of the cable wires attributed to the enhanced *** findings carry theoretical importance when assessing the main cable’s deterioration and the load-bearing safety of a suspension bridge.

关键词： bending tribo-corrosion-fatigue interaction parallel steel wires fatigue load

OsPPG encodes a pseudouridine-5'-phosphate glycosidase and regulates rice spikelet development

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The Crop Journal 2024年第3期12卷 698-708页

作者： Rui Chen dagang Tian Yarong Lin Jiaqing Huang Qinqin Yang Yupei Li Huaqing Liu Shaohua Yang Jingyang Chen Shufen Zhou Feng Wang Shubiao zhang Key Laboratory of Genetics Breeding and Multiple Utilization of CropsMinistry of Education/Key Laboratory of Biological Breeding for Fujian and Taiwan CropsMinistry of Agriculture and Rural AffairsFujian Agriculture and Forestry UniversityFuzhou 350002FujianChina Fujian Key Laboratory of Genetic Engineering for Agriculture Biotechnology Research InstituteFujian Academy of Agricultural SciencesFuzhou 350003FujianChina Institute of Resources Environment and Soil FertilizerFujian Academy of Agricultural SciencesFuzhou 350013FujianChina

Florets are the basic structural units of spikelets,and their morphogenesis determines the yield and quality of rice ***,whether and how pseudouridine-5’-phosphate glycosidase participates in rice spikelet development remains an open *** this study,we identified a novel gene,OsPPG,which encodes a peroxisome-localized pseudouridine-5’-phosphate glycosidase and regulates the development of rice *** mutants exhibited abnormal sterile lemma,lemma,palea,lodicule,stamens,and pistils;male sterility;shorter panicles;and reduced plant *** was found to regulate several OsMADS genes,thereby affecting the morphogenesis of rice ***,metabolomics revealed that the OsPPG gene was involved in the decomposition of pseudouridine via the pyrimidine metabolism pathway and may affect the jasmonic acid signaling *** results suggest that OsPPG is a key regulator of rice spikelet development.

关键词： OsPPG Reproductive regulation Spikelet development Rice

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粗糙表面轴承微极流体润滑的平均流量模型

机械工程学报 2024年第7期60卷 203-211页

作者：朱少禹张向军孙军王大刚中国矿业大学机电工程学院徐州221116 清华大学摩擦学国家重点实验室北京100084 合肥工业大学汽车与交通工程学院合肥230009

目前研究轴承的微极性流体润滑时,一般不考虑轴承表面粗糙度的影响。为处理重载工况下的轴承润滑需要建立综合考虑表面粗糙度和微极性流体综合影响的数学模型。基于平均流量法推导了适用于任意三维粗糙表面轴承的广义平均Reynolds方程... 详细信息

目前研究轴承的微极性流体润滑时,一般不考虑轴承表面粗糙度的影响。为处理重载工况下的轴承润滑需要建立综合考虑表面粗糙度和微极性流体综合影响的数学模型。基于平均流量法推导了适用于任意三维粗糙表面轴承的广义平均Reynolds方程。应用此方程分析了不同综合粗糙度均方根和表面方向参数下轴承的无量纲最大平均油膜压力随偏心率、无量纲微极流体特征长度和耦合系数的变化。结果表明,轴承的综合粗糙度均方根参数与无量纲微极流体特征长度和耦合系数具有很强的耦合特性。随着无量纲微极流体特征长度的减小或者耦合系数的增大,轴承的综合粗糙度均方根值越大,轴承的无量纲最大平均油膜压力越大。而且轴承的表面方向参数也具有类似的特性。提出的广义平均Reynolds方程是对现有微极流体润滑理论的补充,可以方便地用于任意三位粗糙表面轴承的微极流体润滑分析。此外,提出的广义平均Reynolds方程不仅适用于流体动力润滑领域的径向滑动轴承和推力轴承等摩擦副,而且也适用于混合润滑领域的活塞环-缸套等摩擦副。

关键词：径向滑动轴承微极性流体表面粗糙度平均流量方法