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Mechanism investigation of steam flooding heavy oil by comprehensive molecular characterization

Petroleum Science 2023年第4期20卷 2554-2563页

作者： Bo Zhang Chun-Ming Xu Zhe-Yu Liu Qing-Hui Zhao Hai-Qing Cheng Yi-Qiang Li Quan Shi State Key Laboratory of Heavy oil Processing China University of PetroleumBeijing102249China College of Petroleum Engineering China University of PetroleumBeijing102249China Research Institute of Exploration and Development Liaohe Oilfield CompanyPetroChinaPanjinLiaoning124010China

Steam flooding is a widely used technique to enhance oil recovery of heavy *** viscosity reduction and distillation effect are considered as two main displacement mechanisms in steam flooding ***,the molecular composition understanding and contribution for oil production are still *** this study,the composition analysis of the heavy oil was investigated in the core scale steam flooding process with the temperature from 120 to 280℃.The crude oil,produced oils and residual oils were characterized comprehensively by gas chromatography and high-resolution mass *** is found that steam flooding preferentially extracts aromatics and remains more resins in the residual *** reduction is the dominant mechanism when steam is injected at a low *** molecular heteroatoms with high carbon number and high double bond equivalent(DBE)are eluted into the produced oil,while compounds with low carbon number and low DBE are remained in the residual *** the steam temperature rises,the increased distillation effect results in the extraction of light hydrocarbons from the residual oil to the produced *** small heteroatoms with low carbon number and low DBE enter into the produced oil,especially in the none water cut *** compositional difference of produced oils is characterized in DBE versus carbon number distribution of the N and O containing compound *** work uses a variety of composition analysis methods to clarify the steam flooding mechanism and provides a novel understanding of steam flooding mechanisms with various temperatures and production stages from the molecular perspective.

关键词： Steam flooding mechanism Molecular composition High-resolution mass spectrometry Heavy oil enhance oil recovery

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2D Janus polymer nanosheets for enhancing oil recovery:From material ppreparation to property evaluation

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Petroleum Science 2023年第3期20卷 1584-1597页

作者： Hao Shen Zi-Hao Yang Guan-Zhong Wang Yi-Lin Xiong Qi-Chao Lv Qi Cao Qi-Qi Niu Yi-Bo Wang Zhao-xia Dong Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Bejing102249China Sinopec Zhenhai Refining and Chemical Company Ningbo315207ZhejiangChina Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen518055GuangdongChina School of Energy Resources China University of Geosciences(Bejing)Bejing100083China

Janus amphiphilic polymer nanosheets(JAPNs)with anisotropic morphology and distinctive perfor-mance have aroused widespread ***,due to the difficulty in synthesis and poor dispersion stability,JAPNs have been scarcely reported in the field of enhancing oil recovery(EOR).Herein,a kind of organic-based flexible JAPNs was prepared by paraffin emulsion *** lateral sizes of JAPNs were ranging from hundreds of nanometers to several micrometers and the thickness was about 3 *** organic-based nanosheets were equipped with remarkably flexible structures,which could improve their injection *** dispersion and interfacial properties of JAPNs were studied *** modification of crosslinking agent containing multiple amino groups,the JAPNs had excellent hydro-philicity and salt resistance compared with conventional inorganic or composite *** settling time of nanosuspension with NaCl and CaCl_(2) at a low salinity of 1000 mg/L was over 240 *** value could also remain 124 h under the salinity of 10,000 mg/L *** the dual functionalities of Janus amphiphilic nature and nanoparticles'Pickering effect,JAPNs could change rock wettability and form emulsions as"colloidal surfactants",In particular,a new technology called optical microrheology was pioneered to explore the destabilization state of nanosuspensions for the first *** precipitation lagged behind aggregation,especially for stable suspension systems,the onset of the unstable behavior was difficult to be detected by conventional methods,which should be the indicator of reduced effec-tiveness for nanofluid *** addition,the oil displacement experiments demonstrated that the JAPNs could enhance oil recovery by 17.14%under an ultra-low concentration of 0.005%and were more suitable for low permeability *** findings can help for a better understanding of the material preparation of polymer *** also hope that this study could shed more light

关键词： 2D materials Polymer nanosheets enhance oil recovery Janus nature Amphiphilic property

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Simulation of low and high salinity water injection method to determine the optimum salinity

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Petroleum Research 2019年第4期4卷 348-353页

作者： Seyed Mohammad Mehdi Nassabeh Afshin Davarpanah Joata Bayrami Department of Petroleum Engineering Faculty of Engineering and TechnologyOmidiyeh BranchIslamic Azad UniversityOmidiyehIran Department of Petroleum Engineering Science and Research BranchIslamic Azad UniversityTehranIran

Investigating the enhanced oil recovery leads to optimal production,protection and reduction of lateral *** salinity water injection(LSWI)is one of the significantly improved oil recovery(IOR)techniques for changing the amount of wettability in the carbonate fractured *** utilization of this methodology in terms of high efficiency in displacing light crude oils to the medium-gravity crude oils,water sources availability and its sustainability for pushing the oil which leads to appropriate economic occasions,are being compared with other IOR/EOR *** this study,the best injection modelling pattern is based on the highest rate of recovery *** of“high and low salinity water injection method”with“pure water injection method”is performed in an oil ***,analyzing the sensitivity on the high and low salinity according to the moderately low recovery factor of high and low salinity among the injection scenarios illustrates the low sensitivity of this parameter on a fractured carbonate *** reviewing different scenarios,it could be demonstrated that if the water injection could be applied to the reservoir from the preliminary times of production,the recovery factor rate would be ***,higher appropriate efficiency and better supplement have *** water injection has a high recovery factor than salty water *** the way,these two methods have little differences in calculating recovery ***,this parameter is significantly depended on wellhead equipment properties,safety factor and economic issues(water production).

关键词： Low salinity water injection enhance oil recovery Injection scenarios oil recovery factor Water production

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MATHEMATICAL MODEL OF THE MICROBIAL FLOODING

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Journal of Hydrodynamics 2003年第4期15卷 104-108页

作者： Lei Guang-lun, Zhang Zhong-zhi, Chen Yue-ming Faculty of Chemical Engineering, University of Petroleum, Beijing 102249, China Faculty of Chem. Eng. Univ. of Petroleum Beijing 102249 China

On the basis of growth kinetics of microorganism and the principle ofmaterial balance, equations were derived to describe microbial growth, nutrient consumption,metabolites production and their transport in formation. The changes in porosity, permeability, oilviscosity and capillary force were also described as the main facturs of microbial flooding. Forreservoirs with black oil properties, three-dimensional three-phase mathematical models with thecosidara-tion of multi-microbial components were established to depict microbial flooding oil. Withthis model, calculated results are in good agreement with experimental data.

关键词： microbial flooding enhance oil recovery mathematical model

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enhanceD oil recovery BY FLOODING WITH HYDROPHILIC NANOPARTICLES

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China Particuology 2006年第1期4卷 41-46页

作者： Binshan Ju Tailiang Fan Mingxue Ma School of Energy Resource China University of Geosciences Beijing 100083 P. R. China Weff-Log Research Center of Shengli Off-Field Dongying 257095 P. R. China

In this paper, the mechanism of enhanced oil recovery using lipophobic and hydrophilic polysilicon （LHP） nanoparticles ranging in size from 10 to 500 nm for changing the wettability of porous media was analysed theoretically. A one-dimensional two-phase mathematical model considering the migration and adsorption of LHP and wettability change in reservoir rock was proposed, and a simulator was developed to quantitatively predict the changes in relative and effective permeability of the oil and water phases and the oil recovery in sandstone after water driving. Numerical simulations were conducted to study the distribution of the particle concentration, the reduction in porosity and absolute permeability, the LHP volume retention on pore walls and in pore throats along a dimensionless distance, and oil production performance. In conclusion, oil recovery can obviously be improved by flooding with hydrophilic nanometer powders though permeability declines for the retention of nanoparticles in porous media. It is suggested that an LHP concentration ranging from 0.02 to 0.03 is preferable to enhance oil recovery.

关键词： nanoparticle wettability change porous media enhance oil recovery mathematical model

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Numerical simulation study on CO2 flooding in ultra-low permeability reservoirs

Numerical simulation study on CO2 flooding in ultra-low perm...

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2011 International Conference on Energy and Environment(ICEE 2011)

作者： CUI -Maolei DING-Yunhong YANG-Zhengming XIONG-Shengchun WANG-Xuewu Institution of Porous Flow&Mechanics Graduate School of Chinese Academy of Sciences Langfang Branch of Petroleum Exploration and Development Research Institute China National Petroleum Corporation

Massive discharge of CO2 has serious impact on the global climate and threatening the survival of humanity and life. How to make waste profitable becomes the subject of attention. Against this issue with my research domain, CO2 could be injected in the oilfield as a kind of oildisplacing agent, especially the ultra-low permeability oilfield with difficulty in water injection. This technology not only displaced oil but also sealed up part of CO2 underground forever. This passage summarized CO2 displacing mechanism, and did research on the opportunity of advanced CO2 injection and the style of cycle CO2 injection by reservoir numerical simulation application in a typical block using Eclipse software. Through comparing with six proposals, the consequences indicated that CO2 flooding technology could be applied in ultra-low permeability oilfield. Advanced CO2 injection and the style of cycle CO2 injection could both have good flooding effect and pressure maintenance degree. The best opportunity of Advanced CO2 injection is 4 months. In cycle injection proposals, increase-decrease style is better than increasesuspend style. These conclusions could not only provide new theoretical basis for gas flooding in ultra-low permeability reservoirs, but also solve the reduction of CO2.

关键词： Numerical simulation advanced CO2 injection cycle CO2 injection enhance oil recovery

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