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Micro-mechanisms of residual oil mobilization by viscoelastic fluids

Petroleum Science 2008年第1期5卷 56-61页

作者： Zhang Lijuan Yue Xiang＇an Guo Fenqiao Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China development Department Sinopec Exploration and Production Research Institute Beijing 100083 China

Four typical types of residual oil, residual oil trapped in dead ends, oil ganglia in pore throats, oil at pore corners and oil film adhered to pore walls, were studied. According to main pore structure characteristics and the fundamental morphological features of residual oil, four displacement models for residual oil were proposed, in which pore-scale flow behavior of viscoelastic fluid was analyzed by a numerical method and micro-mechanisms for mobilization of residual oil were discussed. Calculated results indicate that the viscoelastic effect enhances micro displacement efficiency and increases swept volume. For residual oil trapped in dead ends, the flow field of viscoelastic fluid is developed in dead ends more deeply, resulting in more contact with oil by the displacing fluid, and consequently increasing swept volume. In addition, intense viscoelastic vortex has great stress, under which residual oil becomes small oil ganglia, and finally be carried into main channels. For residual oil at pore throats, its displacement mechanisms are similar to the oil trapped in dead ends. Vortices are developed in the depths of the throats and oil ganglia become smaller. Besides, viscoelastic fluid causes higher pressure drop on oil ganglia, as a driving force, which can overcome capillary force, consequently, flow direction can be changed and the displacing fluid enter smaller throats. For oil at pore corners, viscoelastic fluid can enhance displacement efficiency as a result of greater velocity and stress near the corners. For residual oil adhered to pore wall, viscoelastic fluid can provide a greater displacing force on the interface between viscoelastic fluid and oil, thus, making it easier to exceed the minimum interfacial tension for mobilizing the oil film.

关键词： Viscoelastic chemical flooding displacement mechanism residual oil swept volume

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ESTABLISHMENT OF THE GEOLOGICAL MODEL OF FRACTURED RESERVOIRS

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石油勘探与开发 1995年第6期22卷 90-97页

作者： Mu Long-xin (research institute of Petroleum {2. and development, CNPC)

ＥＳＴＡＢＬＩＳＨＭＥＮＴＯＦＴＨＥＧＥＯＬＯＧＩＣＡＬＭＯＤＥＬＯＦＦＲＡＣＴＵＲＥＤＲＥＳＥＲＶＯＩＲＳ￥ＭｕＬｏｎｇ－ｘｉｎ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＰｅｔｒｏｌｅｕｍＥｘｐｌｏｒａｔｉｏｎａｎｄ... 详细信息

ＥＳＴＡＢＬＩＳＨＭＥＮＴＯＦＴＨＥＧＥＯＬＯＧＩＣＡＬＭＯＤＥＬＯＦＦＲＡＣＴＵＲＥＤＲＥＳＥＲＶＯＩＲＳ￥ＭｕＬｏｎｇ－ｘｉｎ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＰｅｔｒｏｌｅｕｍＥｘｐｌｏｒａｔｉｏｎａｎｄＤｅｖｅｌｏｐｍｅｎｔ，ＣＮＰＣ）...

关键词： Fracture Geological model Low permeability sandstone oil field

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The Cretaceous tectonic event in the Qiangtang Basin and its implications for hydrocarbon accumulation

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Petroleum Science 2010年第4期7卷 466-471页

作者： Li Yalin Wang Chengshan Li Yongtie Ma Chao Wang Licheng Peng Shaonan State Key Laboratory of Geological Processes and Mineral Resources research Center for Tibetan Plateau Geology China University of Geosciences Beijing 100083 China Petroleum exploration and development {2. institute PetroChina Beijing 100083 China

The tectonic event during Cretaceous and its relationship with hydrocarbon accumulation in the Qiangtang Basin is discussed based on zircon U-Pb dating and the study of deformation, thermochronology and hydrocarbon formation. LA-ICPMS zircon U-Pb dating indicates that the tectonic event took place during the Early-Late Cretaceous （12.-75Ma）. The event not only established the framework and the styles of structural traps in the basin, but also led to the cessation of the first hydrocarbon formation and the destruction of previous oil pools. The light crude oil in the basin was formed during the second hydrocarbon formation stage in the Cenozoic, and ancient structural traps formed during the Cretaceous event are promising targets for oil and gas exploration.

关键词： Qinghai-Tibet plateau Qiangtang Basin tectonic event Cretaceous hydrocarbon accumulation

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THE METHODOLOGY OF PETROLEUM development GEOLOGY(Ⅱ)

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石油勘探与开发 1996年第3期 93-96页

作者： Qiu Yinan (research institute of Petroleum {2. and development, CNPC, Beijing, 100083, P. R. china)

ＴＨＥＭＥＴＨＯＤＯＬＯＧＹＯＦＰＥＴＲＯＬＥＵＭＤＥＶＥＬＯＰＭＥＮＴＧＥＯＬＯＧＹ（Ⅱ）￥ＱｉｕＹｉｎａｎ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＰｅｔｒｏｌｅｕｍＥｘｐｌｏｒａｔｉｏｎａｎｄＤｅｖｅｌｏｐｍｅｎ...

ＴＨＥＭＥＴＨＯＤＯＬＯＧＹＯＦＰＥＴＲＯＬＥＵＭＤＥＶＥＬＯＰＭＥＮＴＧＥＯＬＯＧＹ（Ⅱ）￥ＱｉｕＹｉｎａｎ（ＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＰｅｔｒｏｌｅｕｍＥｘｐｌｏｒａｔｉｏｎａｎｄＤｅｖｅｌｏｐｍｅｎｔ，ＣＮＰＣ，Ｂｅｉｊｉｎｇ，１０...

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AN APPROACH TO CUTTINGS FLUOROLOGGING USING HEXANE AS A SUBSTITUTE

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石油勘探与开发 1997年第4期24卷 92-96页

作者： Zhao Juying(research institute of Petroleum {2. and Devempment, CNPC, Beijing, 100083)

It is discovered that carbon tetrachloride is a fluorescence quencher in crude oil detedion with cottings fluorologging. Hexane, which has many advantages as a substitute for carbon tetrachloride, is proposed. In this paper, four typical comparison results of fluorescence spectra of crude oil samples and some of field cores and cuttings are *** sensitivity of fluorescence analysis is increased by 10 to 35 times when we substitute hexane for carbon tetrachloride as the solvent of crude oil. We also find that the lighter the crude oil,the more Obvious the increase in analysis sensitivity. lt challenges the old concopt that coal-derived oil, condensate and some light oils do not emit fluorescence. The merit of hexane system in eliminating or reducing the fluorescent interference of modified asphalts in drilling fluids for cuttings fluorologging has also been discussed.

关键词： Cuttings logging Fluorescence analysis Hexane Carbon tetrachloride Crude oil (Fluorescence quench)

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Characteristics of hydrocarbon sources and controlling factors of their formation in Pingliang Formation,West Ordos Basin

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Science Bulletin 2007年第S1期 103-112页

作者： CHEN MengJin1, NING Ning2. HU GuoYi2.& LI Jian2.1 Ordos Branch of research institute of Petroleum {2. and development, petrochina, Beijing 100083, china 2.Langfang Branch of research institute of Petroleum {2. and development, petrochina, Langfang 065007, china

According to organic geochemistry and organic petrology, the hydrocarbon sources in Pingliang Formation, W. Ordos basin, are systematically evaluated. The organic abundance of hydrocarbon source in this research is higher in the upper part of profiles than in the low, and more in mudstone than in carbonate. Most of organic matters become sapropelic, and few are humic-sapropelic in the regions of Shibangou and Zhuzisan. According to stable isotopes of carbon and oxygen in carbonate rock, boron index and ratios of elements, palaeo-salinity and sedimentary velocity are calculated. The two factors of paleao-salinity and sediment velocity, which control the distribution of organic matters, are discussed. Good relationship is found between water salinity and abundance of organic matter; in contrast, poor correlation is observed between salinity and types of organic matters. The relative sediment velocity in the research regions is also related with organic abundance and types. A low sediment velocity would lead to high abundance and good type of organic matters, and vice versa.

关键词： Ordos Basin Pingliang Formation abundance kerogen type palaeo-salinity sedimentary velocity

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Geological evolution of the Dongsha Uplift and its surrounding depressions in the South china Sea

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Acta Oceanologica Sinica 1989年第4期8卷 559-564页

作者： Li Desheng and Jiang Renqi research institute of Petroleum {2. and development , P. O. Box 910. Beijing 100083, china Res Inst Petroleum exploration & Dev PO Vox 910 Beijing 100083 China

-The tectonic types of the Zhujiang (Pearl) River Mouth Basin in the South china Sea are epicontinental rift-depression basins. Prior to Early Cretaceous time, the Dongsha Uplift arid its surrounding depressions had been combined with the Eurasia Plate in a single unit. Many ENE-trending narrow rifted basins were formed in the third episode of Yanshan orogeny (Late Laramide). The rifted basins in the Paleocene and Eocene were stretched and extended, forming Zhu 1, Zhu 2.and Zhu 3 depressions. The Dongsha Uplift is located between Zhu 1 and Zhu 2.depressions . covering an area of 2. 000 Km2. Its geologic evolution can be divided into four stages:(1) Late Cretaceous - Paleocene block-faulting stage.(2. Eocene -Oligocene uplifting and eroding stage.(3) Late Oligocene - Early Miocene sustained subsiding stage.(4) Middle Miocene -Recent noncompensated subsiding *** Dongsha Uplift is a structural zone favourable for oil-gas accumulation.

关键词： Geological evolution of the Dongsha Uplift and its surrounding depressions in the South china Sea

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Control of neotectonic movement on hydrocarbon accumulation in the Kuqa Foreland Basin,west china

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Petroleum Science 2010年第1期7卷 49-58页

作者： Jiang Zhenxue Li Lianxia Song Yan Tian Fenghua Zhao Mengjun Wang Haijiang Zhao Zhenxing State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Basin and Reservoir research Center China University of Petroleum Beijing 102249 China exploration and development {2. institute PetroChina Beijing 100083 China Department of exploration ＆ development PetroChina CBM Limited Company Beijing 100013 China exploration Department Tarim Oilfield Company PetroChina Kuerle Xinjiang 841000 China No.8 Oil Production Plant Changqing Oilfield Company PetroChina Xi＇an Shaanxi 710018 China

Neotectonic movement refers to the tectonic movement that has happened since the Cenozoic, which is the latest movement. It has the most important influence on the basins in west china, especially on the hydrocarbon accumulation in the western foreland basins. We determined the time of neotectonic movement in the Kuqa Foreland Basin, which began from the Neogene, and analyzed the patterns of movement, which were continuous and fast subsidence in the vertical direction and intense lateral compression. The structure styles are that the faulting is weakened and the folding is strengthened gradually from north to south. We studied the control of neotectonic movement on the hydrocarbon accumulation process and model in the Kuqa Foreland Basin with basin simulation technique. The largest subsidence rate of the Kuqa Foreland Basin reached 1,2.0 m/Ma during the neotectonic movement, leading to rapid maturing of source rock within 5 Ma and a large quantity of hydrocarbon being generated and expelled. The thick neotectonic strata can form high quality reservoirs with the proved gas and oil reserves accounting for 5% and 2.% of the total reserves, respectively. 86% of the structural traps were formed in the neotectonic movement period. The faults formed during the neotectonic movement serve as important migration pathways and they exist in the region where the hydrocarbon reservoirs are distributed. Abnormally high pressure caused by the intense lateral compression, thick neotectonic strata deposition and rapid hydrocarbon generation provide driving force for hydrocarbon migration. The accumulation elements match each other well over a short period, leading to many large gas fields formed later in the Kuqa Foreland Basin.

关键词： Kuqa Foreland Basin neotectonic movement accumulation element accumulation process accumulation model

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A comparative study of boron isotopes and trace elements of the marine foraminifers during the last glacial maximum and Holocene

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Science china Earth Sciences 2010年第12期53卷 91-100页

作者： NI YunYan 1,2.1 research institute of Petroleum {2. and development,petrochina,Beijing 100083,china 2.Bristol Isotope Group,Department of Earth Sciences,Bristol University,Wills Memorial Building,Queens Road,Bristol BS8 1RJ,United Kingdom 1. research institute of Petroleum {2. and development PetroChina Beijing 100083 China2. Bristol Isotope Group Department of Earth Sciences Bristol University Wills Memorial Building Queens Road Bristol BS8 1RJ UK

Boron isotopic compositions in marine planktonic foraminifers can record changes in seawater pH and hence provide a new tool to reconstruct the changes of paleo-atmospheric *** a comparative study was done on boron isotopes and trace element abundances of planktonic foraminifers,Globigerinoides sacculifer and Globigerinoides ruber from three tropical ODP sites,Site 806B,Site 664C and Site *** is demonstrated here that *** is a better species to be used for downcore boron isotope analyses on glacial-interglacial scales,particularly since *** is prone to dissolution causing unexpectedly light boron isotopes during glacial *** has been shown that the trace elements composition of foraminifers (i.e.,Mg/Ca,U/Ca,B/Ca,and Li/Ca) can reflect the variations of seawater temperature and/or [CO3 2.].However,all of these systems are highly species de-pendent and affected by other vital effects,and it is therefore important to perform necessary calibrations when applying them to the downcore analyses.

关键词： foraminifers boron isotope trace element last glacial maximum atmospheric PCO2

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Classification of carbonate gas condensate reservoirs using well test and production data analyses

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Petroleum Science 2011年第1期8卷 70-78页

作者： Li Yong Li Baozhu Hu Yongle Xia Jing Liu Zhaowei Deng Xingliang She Zhicheng Fan Kun research institute of Petroleum {2. and development PetroChinaBeijing 100083.China china National Oil ＆ Gas exploration and {2. Corporation PetroChinaBeijing 100034China Tarim Oilfield Company PetroChinaKorlaXingjiang 841000China

Carbonate reservoir patterns play an important role in the production performance of oil and gas wells,and it is usually classified through static data analysis which cannot reflect the actual well *** paper takes the Tazhong No.1 gas field in the Tarim Basin,china as an example to investigate the classification of carbonate *** classification method mainly combines well test analysis with production analysis—especially the Blasingame type curve *** on the characteristics of type curves for well test analysis and the Blasingame method,the relationship between the type curves and reservoir pattern was *** than 2. wells were analyzed and the reservoirs were classified into 3 major patterns with 7 ***,the classification results were validated by dynamic performance analysis of wells in the Tazhong No.1 gas *** the basis of the classification results,well stimulation（*** flooding in a single well） was carried out in three volatile-oil wells,and the oil recovery increased by up to 2.%.

关键词： Carbonate reservoir pattern well test analysis production analysis type curve

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