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25 October 2010, Volume 29 Issue 5 Previous Issue    Next Issue

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Tianjin Branch of CNOOC Ltd. to Enhance Core Competitiveness by Taking the Opportunity of Producing 30 Million Tons of Oil Equivalent Liu Liang-yue, Xiong Wei 2010, 29(5): 2-3.  DOI: 10.3969/j.issn.1002-302x.2010.05.001 Abstract ( )   PDF (1322KB) ( )   It is a great challenge for Bohai Oilfield to achieve the goal of 30 million tons oil equivalent, which is also a grandness of Tianjin Branch of CNOOC Ltd. During the process, the core competitiveness of the company, in terms of management, technology and human resources, has been tested and enhanced a lot through continued innovation and optimization. Now the goal has been achieved and it lays a solid basis for the company to evolve into a first-class international energy company and realize sustainable development of Bohai Oilfield. The company has accumulated valuable experience during the process.

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Development of Drilling & Completion in Bohai Oilfield Hastened by Scientific and Technological Progress Yang Qiu-rong, Fan Bai-tao 2010, 29(5): 4-6.  DOI: 10.3969/j.issn.1002-302x.2010.05.002 Abstract ( )   PDF (1325KB) ( )   Scientific and technological progress has always been impulsion of development of drilling & completion in exploitation of Bohai Oilfield for the past years. The unique drilling & completion technology system of China offshore has been formed after introducing and absorbing advanced technologies both home and abroad, and the development of Bohai Oilfield has been hastened a lot. In this paper, main scientific and technological achievements in drilling & completion of Bohai Oilfield in near future are summarized, and the effect of scientific and technological progress on technological innovation of drilling & completion is elaborated. The trend of science and technology is put forward in accordance with the bottleneck of drilling & completion technology, and some management suggestions are given to ensure the improvement of drilling & completion technology.

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Current Situation and Development of Offshore Sand Control Technology Fan Bai-tao 2010, 29(5): 7-12.  DOI: 10.3969/j.issn.1002-302x.2010.05.003 Abstract ( )   PDF (1549KB) ( )   Sand control is critical for improving well productivity and development effectiveness of oilfields. This paper reviews the development of China's offshore sand control technology, and briefs on the application of the concept of moderate sand control, the simplified sand control technique, and the sand control process for multiple intervals with one run-in-hole and other technologies in offshore oil and gas fields, and predicts the development trend of offshore sand control technology in slim hole drilling & completion, and heavy oil thermal recovery, according to the need of offshore oilfield exploration and development.

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Application of Path Control Technology of Overall Infill Drilling on Offshore Cluster Well Group Zhang Xiao-cheng, Liu Ya-jun, Wang Kun-jian, Zhang Hai, Cao Yang 2010, 29(5): 13-17.  DOI: 10.3969/j.issn.1002-302x.2010.05.004 Abstract ( )   PDF (1465KB) ( )   During the process of overall readjustment on offshore oilfields, wellbore anti-collision has become the key factor that restricts the infill drilling of cluster well group. For the difficulties of offshore oilfields, using well path optimization and the anti-collision and barrier-bypassing design, the path control technology of overall infill drilling is implemented. Through the application to L Platform in SZ36-1 Oilfield, it is shown that the technology could effectively prevent the accident of wellbore collision and make drilling easier.

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Research on Dynamic Sand Control Technology of Unconsolidated Sandstone Oilfields Zhang Xiao-cheng, Shi Yu-zhao, Tang Wen-bo, Yang Qiu-rong, Sun Wan-shan 2010, 29(5): 18-20.  DOI: 10.3969/j.issn.1002-302x.2010.05.005 Abstract ( )   PDF (1438KB) ( )   In order to solve the problem between sand control and production capacity in unconsolidated sandstone oilfields, this paper proposes the concept of dynamic sand control technology, develops INFILTER screen pipe available for stand-alone screen sand control, studies the anti-clogging performance of commonly used screen pipe and finds out the cause of clogging. This paper also briefs on the structure, performance indicators and working principle of INFILTER screen pipe. Lab test and field application show that the dynamic sand control technology could greatly improve the anti-clogging capacity of screen pipe, thus effectively improving well productivity, widening the application scopes of stand-alone screen sand control, reducing operation risks and costs, and providing a new method for sand control in similar formations in the future.

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Optimization of Completion Technology of Unconsolidated Sandstone Depleted Reservoir Zhang Xiao-cheng, Fan Bai-tao, Yang Cheng, Zhang Rui-gang, Zhao Shao-wei 2010, 29(5): 21-24.  DOI: 10.3969/j.issn.1002-302x.2010.05.006 Abstract ( )   PDF (1451KB) ( )   Formation porosity and reservoir pressure depletion are the outstanding problems encountered in the adjustment process of Bohai Oilfield development. In view of the technical difficulties of sand control and reservoir protection during the process of completion, this paper adopts appropriate sand control design based on the theory of reasonable sand control, innovates and develops the PRD simplified perforation fluid technology and the supporting completion techniques. Through the application in SZ36-1 Oilfield, it is shown that the technology effectively solves the conflict between gravel pack and leak prevention, reaches a "reasonable sand control + reservoir protection" double-effect, increases well production substantially in single well, and provides an important basis for completion technology of similar oilfields.

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Effect of Moisture Content on Cold Heavy Oil Production Zhao Shao-wei, Yang Jin, Fan Bai-tao, Yang Hao 2010, 29(5): 25-27.  DOI: 10.3969/j.issn.1002-302x.2010.05.007 Abstract ( )   PDF (1432KB) ( )   To study the effect of moisture content on cold heavy oil production (CHOP) near wellbore zone, in the lab, the law of oil and water production under constant pressure is simulated when the moisture content is different. By injecting heavy oil and formation water into artificial core simultaneously under constant pressure, the percolation mechanism and liquid production law are studied. Experimental results show that the moisture content near wellbore zone has no effect on ultimate recovery, providing important theoretical basis for the design of oilfield development plans.

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Experimental Study on Production Optimizing of Cold Heavy Oil Production in Bohai Oilfield Zhao Shao-wei, Yang Jin, Fan Bai-tao, Yang Hao 2010, 29(5): 28-31.  DOI: 10.3969/j.issn.1002-302x.2010.05.008 Abstract ( )   PDF (1616KB) ( )   In order to determine the correlation of drawdown pressure, oil and water production, sand production speed, and sand production rate during the process of heavy oil cold production, taking the sand sample and crude oil in the formation of Chengbei Oilfield, Bohai Sea as an object of study, cold heavy oil production is simulated in the lab. Oil and water is flooded into core when the pressure changes or under constant pressure, the correlation of drawdown pressure, oil and water production and sand production rate is simulated under absolute oil production and oil-water production, the threshold pressure of heavy oil is measured. Experimental results could be good reference for production optimizing in the process of CHOP.

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Drilling Anti-collision Monitoring and Alert System Based on Principle of Vibration Wave Liu Ya-jun, Zhang Hai, Zhang Xiao-cheng, Liu Gang 2010, 29(5): 32-33,47.  DOI: 10.3969/j.issn.1002-302x.2010.05.009 Abstract ( )   PDF (1960KB) ( )   To avoid collision accident of group drilling, the group drilling anti-collision monitoring and alert system is designed. According to the propagation rule and characteristics of vibration wave in the formation and the change of vibration signal, the system could predict whether the bit approaches the offset well or not, corresponding software and hardware equipment is developed. Through the application in Bohai Oilfield, it proves that shallow drilling anticollision monitoring and alert is attended with good results. It is shown that the technology could improve cluster drilling effectively.

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Application of Oil-in-water Drilling Fluid in Horizontal Section of Well CFD18-1-A2h Han Feng-xin, Yang Cheng, Sun Zhen 2010, 29(5): 34-36.  DOI: 10.3969/j.issn.1002-302x.2010.05.010 Abstract ( )   PDF (1389KB) ( )   Basal glutenite and burial hill of the Member 2 of Dongying Formation of Paleogene was drilled in the horizontal section of Well CFD18-1-A2h, where fractures developed, the formation temperature is high, reservoir protection and conventional drilling operations are difficult. Since the oil-in-water drilling fluid has such advantages of low density, small fluctuations in bottomhole negative pressure value, strong stability, good lubricating effect, and less pollution to reservoir, so the horizontal section of Well CFD18-1-A2h is drilled using oil-in-water drilling fluid combined with managed pressure drilling technology. During drilling and completion, oil-in-water drilling fluid is steady, ROP is high, trip-in is normal, and screen is inserted to target depth. Flowing production of is 200% of ODP and reservoir is protected well.

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Application of Clay Free Weak Gel Completion Fluid to Complex Pressure Reservoir Fan Bai-tao, Liu Liang-yue, Deng Jian-ming, Zhao Jing-fang, Zhang Xiao-cheng, He Rui-bing 2010, 29(5): 37-41.  DOI: 10.3969/j.issn.1002-302x.2010.05.011 Abstract ( )   PDF (1346KB) ( )   At present, the formation pressure coefficient of SZ36-1 Oilfield is between 0.7~1.10 from the original normal 1.0 after years of water injection development, and the reservoir heterogeneity, contradiction between layers, high pressure and low pressure formation coexist. SZ36-1 Oilfield has become a complex pressure reservoir system, drilling and completion operations get more difficult. During adjustment development of the Oilfield, only 1.03~1.10 g/cm3 density completion fluids could be used, so completion fluid is leaked seriously and it needs a long time to flow back. In this respect, the clay free weak gel completion fluid system is proposed and applied, i.e. using it as the perforation fluid. The system will form the sealing zone in the perforation holes to improve the low pressure formation bearing pressure capacity, and prevent completion fluid from loss. After completion, broken-gel fluid is injected into to break the gel in the perforation holes, and the fluid flows back to the surface. Field application results show that the system could significantly reduce the completion fluid leakage rate higher than 90% in the complex pressure reservoir and shorten the flowback time, the formation protection effect is remarkable.

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Cluster Well Development with Non-cantilever Rig Han Feng-xin, Yang Cheng, Gong Lian-fen, Zhang Fan 2010, 29(5): 42-44.  DOI: 10.3969/j.issn.1002-302x.2010.05.012 Abstract ( )   PDF (1414KB) ( )   BZ13-1 production platform is a transferring hinge of southern Bohai Oilfield, which barges up against insufficiency of cantilever drilling rig during exploitation seedtime, and it couldn't meet the overall needs of the development of Bohai Oilfield. To alleviate resource conflicts, CNOOC drill completion workers, in accordance with the existing conditions, put forward and adopt the "non-cantilever rig + underwater base plate" mode of operation creatively, which not only ensures a smooth production schedule at the Oilfield, but obtains direct economic benefits as high as 140 million yuan. At the same time, it could yield indirect economic benefits of 927 million yuan annually and good social benefits. The success of this new operation mode provides a strong reference for the subsequent application of this technology.

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Application of Single Drill String for Three-Barrel Coring Technology in Weizhou11-1N Oilfield Li Hu-cheng, Wang Xiao-yong, Duan Ze-hui, Zhang Hong-sheng, Gu Chun-wei 2010, 29(5): 45-47.  DOI: 10.3969/j.issn.1002-302x.2010.05.013 Abstract ( )   PDF (1344KB) ( )   The cost of offshore oil drilling is very high, coring time is short, however trip out & in account for most of the time during coring. In order to save costs and increase efficiency, single drill string for three-barrel coring is applied in Weizhou11-1N Oilfield for the first time, advanced Yb-8100 coring tool is adopted, the drilling assembly is designed with three coring barrels and three stables to core for 24.74 meters continuously, and the yield is up to 99.9%. It is an audacious attempt, the harvest could save two trips out & in time, high-efficiency economical coring could be obtained, valuable experience is therefore accumulated for the application of single drill string for three barrels or even more barrels coring technology.

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Discussion on Development Mode of Marginal Oilfields in Bohai Sea Area Liu Jian-zhong, Wan Xiao-xun, Zhang Bin-hai, Wan Jun 2010, 29(5): 48-50.  DOI: 10.3969/j.issn.1002-302x.2010.05.014 Abstract ( )   PDF (1386KB) ( )   Bohai Sea Area is abundant in oil and gas resources. During ten years of exploration, not only a series of large and medium-sized oil and gas fields with relatively small geological structure have been discovered, but some so-called "marginal oilfields" with small-scale and low-grade reserves that are difficult to product economically and efficiently are detected. After constant exploration and practice, some mature development modes for effective development of similar oilfields have been developed. However, these development modes are not applicable for the isolated marginal oil and gas fields near 5m contour in shallow sea area. This paper discusses the problem of which mode could be used for the development of similar oilfields, and brings forward that the artificial island development mode could minimize the time for project construction and drilling & completion and meet the requirements of economic development.

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Analysis on Programme Management of Drilling & Completion in Bohai Oilfield Guo Jian, Chen Ai-guo 2010, 29(5): 51-53.  DOI: 10.3969/j.issn.1002-302x.2010.05.015 Abstract ( )   PDF (1361KB) ( )   In order to find out the method suitable for management of drilling & completion projects in Bohai Oilfield and fulfill complete control of health, safety, environmental protection, progress, quality and cost, this paper discusses relevant issues about "programme management". It defines the programme management mode theoretically and introduces the implementation of the mode as a main programme management mode in Bohai Oilfield. The successful implementation in Bohai Oilfield provides some reference for the programme management of petroleum system and even other systems. The authors in this paper believe that this kind of management mode is of great significance to enhancing economic benefits of enterprises.

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Application of Development Model of Drilling & Completion Engineering Based on Reservoir Study in BZ28-2S Oilfield Yang Qiu-rong, Liu Peng, Li Gang, Xiang Ming 2010, 29(5): 54-56,69.  DOI: 10.3969/j.issn.1002-302x.2010.05.016 Abstract ( )   PDF (2005KB) ( )   Most of reservoir in south of Bohai area is complicated fault-block reservoir, how to develop them with high efficiency is a problem needed to be solved quickly. In this paper, development model of drilling & completion engineering based on reservoir study is put forward for the first time. The appropriate drilling & completion plan and technology are researched by the fully study of reservoir to enhance the production of single well. This development model has good experiment effect in two wells of BZ28-2S Oilfield. The preparatory and drilling & completion efficiency has been enhanced effectively, and the production of these two testing wells is more than two times of proration production after put into production. This provides a valuable development model for development of similar reservoir in the future.

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Study and Practice on New Management Mode for Oilfield Development Project Compilation in Bohai Oilfield Yan Feng-yu, Liu Shu-qiang, Xu Jin-xiu 2010, 29(5): 57-59.  DOI: 10.3969/j.issn.1002-302x.2010.05.017 Abstract ( )   PDF (1576KB) ( )   Oil production will be up to 30 million tons in 2010 in Bohai Oilfield, so many oil and gas fields would be put into production before the year of 2010 with pressing time limit. The traditional "train-like" management mode did not adapt to the situation, so Tianjin Branch of CNOOC Ltd. broke the traditional management mode, innovated management ideas and applied new mode, that is "diluting interface moderately, integrating exploration and development and optimizing management program". Consequently, many oilfields' ODP had been finished before 2007, which is a solid basis for the production in 2010.

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Efficient Development Patterns for Cluster Oilfields in Bohai Bay Zhai Gang, Liao Qian-hua, Zhao Yong-sheng, Nie Chao-min, Yang Liu-he 2010, 29(5): 60-65.  DOI: 10.3969/j.issn.1002-302x.2010.05.018 Abstract ( )   PDF (1667KB) ( )   Restricted by the site, equipment, processing and transportation, offshore oil production is more difficult. In recent years, CNOOC has increasingly made new breakthroughs in offshore oil exploration and development, with annual production reaching 10 million tons, 15 million tons and 20 million tons successively, contributing a lot to meeting domestic energy demands. Depending on the cognition and practice of organization management during the development and implementation phase, this paper discusses the problems in efficient development patterns for offshore cluster oilfields in terms of implementing principle, resource allocation, and decision-making management, which could be good reference to efficient development of oilfields.

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Research and Development of Dynamic Management System of Offshore Oil Drilling and Completion Materials Yang Cheng, Chen Ai-guo, Wei Wen-chao 2010, 29(5): 66-69.  DOI: 10.3969/j.issn.1002-302x.2010.05.019 Abstract ( )   PDF (1331KB) ( )   In view of the existing problems and industrial characteristics of information management of drilling and completion materials of offshore oil and gas development companies, this paper puts forward the research idea of dynamic management system of drilling and completion materials, also carries out development and application. Through practical use of the system, not only the goal of research and development is achieved, but good results are obtained in its application to dynamic management of drilling and completion materials.

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Application and Development of Well Site Regional Survey in Bohai Bay Tao Lin, Liu Xiao-gang 2010, 29(5): 70-72.  DOI: 10.3969/j.issn.1002-302x.2010.05.020 Abstract ( )   PDF (1430KB) ( )   Ocean well site survey is to carry out measurement and survey of undersea rock formations, water depth, seabed topography, shallow gas and soil around the well location before spudding, which is important to ascertain the safety of drilling rigs positioning. Recently with the rapid development of Bohai Oilfield, the existing survey vessel resources are too tight to fully and timely meet the work requirements. In early 2008, the Drilling Department of Tianjin Branch proposed the assumption of well site regional survey. On the basis that the geological department provided a series of appraisal well location on the same block, the survey company designed plans to investigate a series of test wells, with an aim to understand the geological structure in complex areas, define area feature and geological characteristics distribution. Through tentative use in KL3-2 Block and successful spread in other blocks, we have not only saved half month of the survey vessel's operating time, but also saved four million investigation fee, which has created a good economic benefit for company.