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Distribution,formation and evolution of sand ridges on the East china Sea shelf

Science china(Technological Sciences) 2010年第3期53卷 822-828页

作者： ZHAO RenBao 1,2,SUN HaiTao 3,WU YaSheng 3 &ZHAO ChuanFeng 1,2 1MOE Key Laboratory of petroleum Engineering,china university of petroleum,beijing 102249,china 2 enhanced oil recovering research center,china university of petroleum,beijing 102249,china 3Faculty of Natural Resource&Information Technology,china university of petroleum,beijing 102249,china MOE Key Laboratory of petroleum Engineering China University of Petroleum Beijing China enhanced oil recovering research center China University of Petroleum Beijing China Faculty of Natural Resource & Information Technology China University of Petroleum Beijing China

Influence of CO2 corrosion on reservoir mineralogical composition,pore structure and their mechanical characteristics was studied using XRD,SEM,rock tri-axial machine and core flow experimental *** was found that the corrosion effect was mainly attributed to rock texture and structure,fluid composition and external dynamical conditions in the experimental *** cores with bedding structures,their bedding surfaces were the preferential corrosion regions,because micro-cracks would evolve at these surfaces in the pressure-releasing ***,for cores with massive structures controlled by stable water environment,the CO2 corrosion would result in pore enlargement and secondary pore *** gas velocity from outlet showed sharp increase in the injection process of CO2-H2O *** could be explained by two changes caused by *** was the opening and closure of *** other was particle *** the corrosion time increased,both tensile strength and compressive strength decreased,which confirmed decrease of cementation *** should also be noted that permeability increase and micro-cracks generation would pose damage to the capacity of CO2 geological storage.

关键词： carbon dioxide geological storage mineralization enhanced oil recovery corrosion

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research on a novel composite gel system for CO_2 breakthrough

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petroleum Science 2010年第2期7卷 245-250页

作者： Hou Yongli Xiang＇an Production Optimization China Oilfield Services Limited Tianjin 300450 China enhanced oil Recovery research center China University of Petroleum Beijing 102249 China

A composite gel was prepared for plugging CO2 channeling, which is a serious problem for enhanced oil recovery with CO2. A composite gel which is one of the materials for successful control of CO2 channeling during CO2 injection process was studied in this paper. SEM and nano particle size analysis were used to describe this material’s microstructure. Its effect on CO2 channeling control was evaluated with core flow experiments. Both the rheological test and core plugging experiments indicated that both acrylamide monomer concentration and reaction pressure had positive influences on gel properties. The gel system with an acrylamide monomer concentration of 2% and 5% sodium silicate was proved to have excellent strength, elastic and plugging efficiency, which confirmed huge development potential and wide application of the composite gel system. The high-pressure acid environment arising from the CO2 injection not only reacts with solid silicate to form silicic acid gel, but also facilitates efficient polymerization.

关键词： enhanced oil recovery CO2 channeling composite gel acrylamide monomer

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Stability and water control of nitrogen foam in bulk phase and porous media

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petroleum Science 2009年第2期6卷 181-187页

作者： Zhao Renbao Hou Yongli Ke Wenqi Yue Xiang＇an Key Laboratory of petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China research center of enhanced oil Recovery China University of Petroleum Beijing 102249 China

Foam is widely used in the petroleum industry thanks to its unique properties and performance. Its application to water control in oil wells has received more and more attention. The stability of nitrogen foam was investigated in pressurized equipment and sand pack. The result indicated that with increasing pressure （0-2 MPa） the stability of foam in the pressurized equipment increased linearly. Increased nitrogen injection pressure caused better dispersion of nitrogen-foaming solution in porous media. The initial residual resistance factor to gas was an exponential function of injection pressure, but the residual resistance factor （to gas and liquid） decreased exponentially with time. The halflife of foam in porous media （expressed in residual resistance factor） was much longer than that in bulk phase （expressed in foam height）. Pore model analysis indicated that good dispersion in porous media and the presence of thick liquid film during dispersion were the main reasons for high stability. Field test indicated that effective residence of foam in the formation not only resulted in much better heat insulation, but also improved steam stimulation by enhancing steam heating.

关键词： enhanced oil recovery foam porous media permeability residual resistance factor,residence time

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Physical simulation of fluid flow and production performance in extra-low permeability porous media

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petroleum Science 2009年第4期6卷 415-420页

作者： You Yuan Yue Xiang’an Li Mingyi Zhao Chunpeng Zhang Tao Key Laboratory of petroleum Engineering Ministry of EducationChina University of PetroleumBeijing 102249China enhanced oil Recovery research center China University of PetroleumBeijing 102249China Jilin oil Field PetroChinaSongyuanJilin 138000China Exploration&Production research Institute SinopecBeijing 100083China Exploration Department Changqing Oil FieldPetroChinaXi’anShaanxi 710018China

For extra-low permeability reservoirs, with a permeability of about 0.3×10?3 μm2, fluid flow and production performance in cores were studied. A long core holder with a multi-location piezometric measurement was specially designed. An artificial long core, about 700 mm long and with a cross section of 45mm×45mm, was used. In the experiment, pressure distribution along the core can be measured in real time. Single phase flow in the core was investigated. Different modes of production in long cores were also simulated including natural depletion, water flooding, and advanced water flooding. Through physical simulation, flow parameters were collected and production characteristics in extra-low permeability cores were studied. From experimental results, it can be seen that fluid flow in extra-low permeability cores is different from that in high permeability cores. Transmission of pressure in extra-low permeability cores is very slow, and it needs a long time for the pressure to become stable. The distribution curve of pressure along the core is nonlinear and the production rate in extra-low permeability reservoirs decreases sharply. The development effects of different production modes in extra-low permeability cores were compared with one another. Among the production modes, advanced water flooding has much potential for effective development of extra-low permeability reservoirs. Natural depletion and conventional water flooding can also be used in early production periods. In addition, the countermeasures and some ideas especially for the potential development of extra-low permeability reservoirs are suggested.

关键词： Extra-low permeability reservoirs physical simulation fluid flow production performance

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Influence of surfactants used in surfactant-polymer flooding on the stability of Gudong crude oil emulsion

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petroleum Science 2010年第2期7卷 263-267页

作者： Dong Zhaoxia Lin Meiqin Wang Hao Li Mingyuan enhanced oil Recovery research center China University of Petroleum Beijing 102249 China

The influences of an anionic-nonionic composite surfactant and petroleum sulfonate, used in surfactant-polymer flooding in Shengli Gudong oilfield, East china, on the interfacial properties of Gudong crude model oil and synthetic formation water was studied by measuring interfacial tension, interfacial viscoelasticity and Zeta potential. The in？ uence of the surfactants on the stability of Gudong water-in-oil （W/O） and oil-in-water （O/W） emulsions was evaluated by separating water from the W/O emulsion and residual oil in the aqueous phase of the O/W emulsion respectively. The results showed that the two kinds of surfactants, namely anionic-nonionic composite surfactant and petroleum sulfonate, are both able to decrease the interfacial tension between the oil phase and the aqueous phase and increase the surface potential of the oil droplets dispersed in the O/W emulsion, which can enhance the stability of the W/O and O/W crude oil emulsions. Compared with petroleum sulfonate, the anionic-nonionic composite surfactant is more interfacially active and able to enhance the strength of the interfacial film between oil and water, hence enhance the stability of the W/O and O/W emulsions more effectively.

关键词： Surfactant Gudong crude oil interfacial properties emulsion stability

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Rheological properties of polymer micro-gel dispersions

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petroleum Science 2009年第3期6卷 294-298页

作者： Dong Zhaoxia Li Yahua Lin Meiqin Li Mingyuan enhanced oil Recovery research center China University of Petroleum Beijing 102249 China

The influence of swelling time, temperature, NaCl concentration and polymer micro-gel concentration on rheological properties of polymer micro-gel dispersions was studied by using a HAAKE rheometer. The results showed that with increasing swelling time and NaCl concentration, the polymer micro-gel dispersions changed from a shear-thickening fluid to a Newtonian fluid. The polymer micro-gel dispersion show shear-thinning in non-saline water. At higher swelling temperature, the time of the polymer micro-gel dispersion showing shear-thickening was shorter. With increasing polymer micro-gel concentration, the dispersion changed from shear-thickening to shear-thinning.

关键词： Polymer micro-gel rheological property shear-thickening shear-thinning

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Dispersion polymerization of anionic polyacrylamide in an aqueous salt medium

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petroleum Science 2010年第3期7卷 410-415页

作者： Lu Jiao Peng Bo Li Mingyuan Lin Meiqin Dong Zhaoxia enhanced oil Recovery research center China University of Petroleum Beijing 102249 China

Anionic polyacrylamide dispersions were prepared by dispersion polymerization in an aqueous salt medium, using acrylamide（AM） and acrylic acid（AA） as monomers and anionic polyelectrolytes as stabilizer. Effects of salt concentration, and molecular weight and concentration of stabilizers on the stability of the dispersions were investigated using a HAAKE rheometer and optical microscopy. The results showed that stable anionic polyacrylamide dispersions, consisting of smooth, spherical, polydisperse particles, could be obtained under the conditions of salt concentration ranging from 26 wt% to 30 wt%, concentration of stabilizers from 1.2 wt% to 1.8 wt%, and intrinsic viscosity of stabilizers from 2.98 dL·g^-1 to 3.74 dL·g^-1. The apparent viscosity of the stable dispersions changed very little with the shear rate, showing Newton fluid behavior.

关键词： Dispersion polymerization aqueous salt medium stability micromorphology apparentviscosity

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Influence of dissolved oxygen content on oxidative stability of linked polymer solution

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petroleum Science 2009年第4期6卷 421-425页

作者： Zhao-xia Dong Mei-qin Lin Jian Xin Ming-yuan Li china Univ Petr Enhanced Oil Recovery Res Ctr Beijing 102249 Peoples R China

The influence of dissolved oxygen content on the oxidative stability of a linked polymer solution (LPS) was studied by micro-filtration, dynamic light scattering and viscosity measurements. The results showed that at the same temperature, the degree of the oxidative degradation of the LPS increased and the rapidity of the oxidative degradation was accelerated with the increase of the dissolved oxygen content. Consequently, the size of linked polymer coils (LPCs) of the LPS became small, and the plugging capability of the LPS decreased. At a fixed content of dissolved oxygen, with increasing degradation temperature, almost the same results were observed, namely, an increased degree of oxidative degradation, accelerated rapidity of the oxidative degradation and decreased plugging capacity, with decreased oxidative stability of LPS. At 90 °C, in the presence of oxygen, LPS lost its plugging capability after having been degraded for a period of time. But at 40 °C, LPS with low dissolved oxygen content could be stable for a long time. The decreased plugging ability of LPS after oxidative degradation is mainly caused by the decreased size and number of the LPCs due to the breaking of hydrolyzed polyacrylamide (HPAM) molecule segments and the structural changing of HPAM molecules.

关键词： Linked polymer solution HPAM content of dissolved oxygen degradation stability

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A quick evaluation model for CO_2 flooding and sequestration

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petroleum Science 2010年第4期7卷 515-523页

作者： Yao Yuedong Ji Zemin Key Laboratory of petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China

CO2 flooding not only triggers an increase in oil production,but also reduces the amount of CO2 released to the atmosphere （by storing it permanently in the formations）.It is one of the best ways to use and store *** paper firstly selects the key factors after analyzing the factors influencing the CO2 storage potential in the formations and oil recovery,and then introduces a series of dimensionless variables to describe reservoir *** influencing factors with varying values are calculated through a Box-Behnken experimental *** results are interpreted by a response surface method,and then a quick screening model is obtained to evaluate the oil recovery and CO2 storage potential for an oil *** on the evaluation model,sensitivity analysis of each factor is carried ***,research on CO2 sequestration and flooding in a typical reservoir indicates that the evaluation model fits well with the numerical simulation,which proves that the evaluation model can provide criteria for screening attractive candidate reservoirs for CO2 sequestration and flooding.

关键词： Evaluation model enhanced oil recovery CO2 sequestration Box-Behnken design response surface method

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Performance evaluation of oil displacing agents for primary-minor layers of the Daqing oilfield

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petroleum Science 2011年第1期8卷 79-86页

作者： Zhang Jian Wang Shuxia Lu Xiangguo He Xianhua School of petroleum Engineering China University of PetroleumBeijing 102249China School of petroleum Engineering Northeast Petroleum UniversityDaqingHeilongjiang 163318China Information Section E＆D Research Institute of Daqing OilfieldDaqingHeilongjiang 163712China

A series of experiments were conducted to investigate the molecular coil dimension（D_h） and molecular configuration of partially hydrolyzed polyacrylamides（HPAM）,surfactant/HPAM system, and a living *** between the polymer coils and the porous media was evaluated by instrumental analysis and laboratory simulation ***,the performance of chemical flooding was *** indicated that the D_h decreased with an increase in water salinity and increased with an increase in polymer *** aqueous solution,the polymer presented three-dimensional reticular configuration and exhibited a fractal structure characterized by self-similarity. The polymer in the surfactant/HPAM system was mainly in the form of＂surfactant-polymer＂complex compound and the living polymer had an irregular＂flaky-reticular＂configuration which resulted in relatively poor compatibility between the molecular coils and the porous *** type of oil displacing agent and its slug size influenced the incremental oil *** the same oil displacing agent,a larger slug size would lead to a better chemical flooding *** the final recovery efficiency and economic benefits,high-concentration polymer flooding was selected as the optimimal enhanced oil recovery（EOR） technique and the incremental recovery efficiency was forecast to be 20%.

关键词： Primary-minor layers molecular coil dimension molecular configuration compatibility

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