Article
Polymer Science
Hongtao Fu, Zhenqiang Bai, Hu Guo, Kena Yang, Chunping Guo, Mingxi Liu, Lihao Liang, Kaoping Song
Summary: Polymer flooding has gained increasing attention worldwide for its high incremental oil recovery factor and relative low costs compared with other oil recovery techniques. However, for oilfields that have already undergone polymer flooding, such as Daqing Oilfield in China, there is a need for further improvement in recovery. Traditional heterogeneity studies cannot accurately characterize the remaining oil distribution after polymer flooding. In this study, a method to quantitatively describe the reservoir's architecture was established, and the distribution pattern and development potential of the remaining oil was analyzed. The results show great potential for development, with about 40% of the original oil in place (OOIP) in Daqing Oilfield yet to be produced. This study is important for improving oil recovery in polymer-flooded reservoirs.
Article
Energy & Fuels
Huiying Zhong, Yuanyuan He, Erlong Yang, Yongbin Bi, Tingbao Yang
Summary: Viscoelastic polymer flooding is widely used as an enhanced oil recovery method in oilfield development. This study focused on investigating the effects of polymer elasticity on displacement characteristics in Class II reservoirs, particularly in heterogeneous reservoirs. The research found that different oil layers have different displacement efficiencies, and increasing relaxation time can improve oil displacement efficiency.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Yan-Feng Wei, Lu Wang, Zi-Yuan Xia, Min Gou, Zhao-Yong Sun, Wei-Feng Lv, Yue-Qin Tang
Summary: This study characterized indigenous microorganisms in oil reservoirs after polymer flooding (RAPF). The results showed that both crude oil and Aqu0.1 contained different functional microorganisms related to hydrocarbon degradation. This is significant for investment and exploration of indigenous microorganisms for microbial enhanced oil recovery (MEOR).
JOURNAL OF APPLIED MICROBIOLOGY
(2022)
Article
Polymer Science
Rafael E. Hincapie, Ante Borovina, Torsten Clemens, Eugen Hoffmann, Muhammad Tahir, Leena Nurmi, Sirkku Hanski, Jonas Wegner, Alyssia Janczak
Summary: This work presents various evaluations of key prior field applications, combining laboratory approaches to optimize the usage of polymers and alkali. The performance of AP floods can be optimized by adjusting the polymer viscosities during injection and aging in the reservoir. AP conditions not only reduce polymer retention in the reservoir but also result in significant cost savings. Lower-concentration polymer solutions aged in alkali show the same displacement efficiency as non-aged polymers with higher concentrations.
Article
Energy & Fuels
Zhenhua Wang, Jirui Hou, Hongda Hao, Cheng Wang, Likun Wang
Summary: Establishing standards for screening suitable CO2 flooding reservoirs in the Daqing Oilfield can improve CO2 flooding and burial efficiency. The influencing factors of CO2 flooding can be classified into geological factors, fluid properties, and development factors, and the importance of multiple factors can impact the results. Multiple linear regression can provide effective guidance for the development of the Daqing Oilfield.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Xinjian Tan, Jihong Zhang, Yanan Wang, Ming Li, Jiamin Liu, Zhengjun Zhu
Summary: The Pubei Block in Daqing Oilfield poses challenges for conformance control due to high temperature (average 80 degrees C) and salinity (13,451 mg/L). This study aims to evaluate the feasibility of using a terpolymer in situ gel system to address this issue. The gel treatment improved oil recovery by 19.88% in core-scale evaluation and the pilot test showed an increased oil recovery factor of 9.82% over a period of 36 months.
Article
Energy & Fuels
Nan Jiang, Zilu Zhang, Guohui Qu, Jiqiang Zhi, Rongzhou Zhang
Summary: Fracture-flooding technology plays a significant role in improving the recovery efficiency of class III reservoirs.
Article
Environmental Sciences
Daniel T. Field, Jordan L. Green, Robert Bennett, Lauren C. Jenner, Laura. R. Sadofsky, Emma Chapman, Mahmoud Loubani, Jeanette M. Rotchell
Summary: This study aimed to quantify and characterize the microplastics present within the surgical environment. The results showed a negative correlation between microplastic levels and size, with mainly fragment-shaped microplastics composed of polyester, polypropylene, polyethylene, and nylon. These findings provide novel information on the types and levels of polymers in a room environment.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Biochemistry & Molecular Biology
Wenchao Jiang, Zhaowei Hou, Xiaolin Wu, Kaoping Song, Erlong Yang, Bin Huang, Chi Dong, Shouliang Lu, Liyan Sun, Jian Gai, Shichun Yao, Yunchao Wang, Chunlin Nie, Dengyu Yuan, Qinghua Xu
Summary: This paper aims to measure and calculate the relative permeability curves of polymer flooding more accurately by studying the viscosity variation law of polymer in porous media. The viscosity retention rate of polymer solutions transporting in porous media was found to have a power function relationship with water saturation and dimensionless distance from the core inlet. The relative permeability curves of polymer flooding were measured by an unsteady state method and calculated using the viscosity variation rule.
Article
Physics, Applied
Kamakshi Patel, Anastasiya Sergievskaya, Samir Chauhan, Stephanos Konstantinidis
Summary: The heating of liquid substrate by low-pressure sputtering plasma was investigated and the temperature increase was measured. The effect of sputtering conditions on liquid temperature was studied and the data were compared with numerical calculations and COMSOL simulation. The provided information is important for understanding the formation of nanoparticles during sputtering onto liquids.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Polymer Science
Fuquan Luo, Xiao Gu, Wenshuang Geng, Jian Hou, Changcheng Gai
Summary: This study investigates the effects of gel-assisted polymer and surfactant binary combination flooding in strong edge water reservoirs using numerical simulation, and provides screening criteria for the application of this method in such reservoirs. The results show that the presence of edge water is not conducive to binary combination flooding, and reservoirs with smaller water volumetric multiples and larger oil-bearing areas are more suitable for this technique.
Article
Environmental Sciences
Xiaoju Yan, Guodong Wang, Cong Ma, Junyu Li, Shirong Cheng, Chengyu Yang, Lin Chen
Summary: The study used response surface methodology to analyze the effects of pollutant interactions in ASP flooding oilfield wastewater on membrane fouling, showing significant influence on flux decline. Characterization of FTIR and SEM revealed that the MD membrane was fouled by the wastewater, but the flux was restored to 86.9% after hydraulic cleaning.
Article
Environmental Sciences
Guanghui Rong, Honggang Zhang, Zhongbo Gu, Hao Hou, Chao Gao, Bo Wang, Wenjie Zhou
Summary: This paper evaluates the effect of polymer type, injection concentration, and injection volume on polymer flooding through simulation experiments. The results show that under specific conditions, the salt-resistant polymer solution has a more significant improvement in oil recovery compared to the ordinary polymer for low permeability reservoirs. Additionally, considering the polymer flooding effect and input cost, the pollution-distributed dilute salt resistant polymer solution is chosen for flooding.
FRESENIUS ENVIRONMENTAL BULLETIN
(2022)
Article
Mechanics
Mohammed A. Al-Muzaiqer, Konstantin S. Kolegov, Natalia A. Ivanova, Viktor M. Fliagin
Summary: This work focuses on a method to generate particle cluster assemblies using nonuniform evaporation, where the local inhomogeneity of vapor flux density is achieved by exploiting temperature gradient. Experimental results show that the height and base area of the clusters formed in the central region vary with the initial thickness of the liquid layer.
Review
Energy & Fuels
Zhi-Bin An, Kang Zhou, De-Jun Wu, Jian Hou
Summary: This paper analyzes the production performance of the pilot test of infilling polymer-surfactant-preformed particle gel (PPG) flooding in China and proposes different response types and the underlying reasons. The remaining oil distribution after polymer flooding is summarized into four types, and the main displacement mechanisms for each type are clarified. Additionally, the relationships between the remaining oil distribution and production characteristics of infilling polymer-surfactant-PPG flooding are analyzed.
Article
Energy & Fuels
Qinglin Cheng, Yifan Gan, Zhihua Wang, Wei Sun, Shuang Wang, Chao Liu, Qibin Li, Yang Liu
Summary: The study found that waxy crude oil can settle on the inner tube, and its deposition and adhesion behavior change over time, leading to the gradual hardening of the sediment layer on the inner wall.
Article
Energy & Fuels
Yang Song, Yunfei Xu, Zhihua Wang
Summary: This study proposed an efficient demulsification scheme using polyaluminum chloride (PAC) as a chemical regulator to control electric field destabilization and promote oil-water separation. The dehydration temperature, power supply mode, and electric field parameters were optimized to achieve superior dehydration effect of ASP flooding produced liquid.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Review
Energy & Fuels
Yong Wang, Xiaoyu Liu, Zuonan Huang, Zhihua Wang, Yang Liu
Summary: This article reviews the characterization methods for wax precipitation and deposition behavior in wellbores, and discusses the applicability and limitation of modeling and experiment studies. It also highlights the importance of molecular dynamics simulation technique in enriching the investigation of wax precipitation and deposition and providing guidance for unconventional hydrocarbon exploitation processes.
Article
Energy & Fuels
Yunfei Xu, Zhihua Wang, Xue Han, Jiajun Hong, Yong Wang
Summary: This paper investigates the impact of sodium dodecyl benzene sulfonate (SDBS) concentration on the stability of crude oil-mineral water interfacial film. By constructing different simulation systems and comparing with experimental results, it is found that the number of SDBS molecules per unit area of the film increases with concentration, leading to increased film thickness and interface formation energy. In addition, inorganic ions weaken the performance of SDBS and detrimentally affect the structural strength and stability of interfacial films.
Article
Energy & Fuels
Haijun Luo, Jiangbo Wen, Chunlei Lv, Zhihua Wang
Summary: When oilfield development enters the middle and late stages, the crude oil-water mixture often has a high water cut and cannot form a stable emulsion. Traditional emulsion viscosity models are not suitable for this unstable mixture. It is important to understand the viscosity characteristics of the unstable crude oil-water mixture with high water cut (UCMH) for pipeline transportation. The apparent viscosities of UCMH for 16 crude oils were determined and it was found that the apparent viscosity decreased with increasing shear rate, water cut of mixture, and temperature. The apparent viscosity of UCMH was not dependent on the content of single surfactants but was closely related to the content of combinatorial surfactants.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Hang Dong, RunZe Ma, Jian Zhao, Xiangrui Xi, Zhihua Wang
Summary: This paper applies rheo-optic in situ measurement technology to study the rheological characteristics of waxy crude oil for the first time, and investigates its response to thermal history, shear-thinning, and wax crystal dynamics. It is found that two types of wax crystals can be formed under certain thermal historical conditions, and their proportion change is the root cause of the fluency of waxed crude oil. The crack of the flocculation structure plays a leading role at shear rates below 5 s(-1), while the deformation of the wax crystal comes into effect when the shear rate exceeds 5 s(-1).
Article
Energy & Fuels
Zhihua Wang, Xiaoyu Liu, Jinling Li, Jiajun Hong, Yaming Qi, Xiaowei Li
Summary: This paper systematically investigates the micro influence mechanism of the coated wall on the behavior of wax-asphaltene molecules in waxy crude oil transportation flowlines. The results show that the presence of coatings inhibits the aggregation and adhesion of wax-asphaltene molecules, and the degree of diffusion inhibition varies with different coatings. These findings provide new insights and guidance for controlling heavy component deposition in pipeline transportation.
Article
Energy & Fuels
Zhihua Wang, Yunfei Xu, Yifan Gan, Xue Han, Wenbo Liu, Hua Xin
Summary: This study investigates the behavior of HPAM molecules at the crude oil-water interface. The results show that HPAM molecules aggregate in different forms, and the inorganic cations have an impact on the aggregation. The stability of the interfacial film is correlated with the gyration radius of the HPAM molecules, and the effect of hydrolysis degree on stability is within a certain range.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Polymer Science
Yong Wang, Xinpeng Le, Xingwang Wang, Wenbo Liu, Zhihua Wang
Summary: Through molecular dynamics simulation, an SDBS/HPAM/OH- water-based foam simulation system was constructed to study the influence of chemical agent components on foam stability. The results showed that the foam stability was the highest in the SDBS/HPAM/OH- system, while the addition of HPAM molecules weakened the formation ability of the foam liquid film and restricted the drainage and diffusion of gas molecules.
Article
Chemistry, Physical
Zhihua Wang, Yunfei Xu, Nasir Khan, Chaoliang Zhu, Yanhua Gao
Summary: In this study, the impact of surfactant, polymer, and physical properties of crude oil on the characteristics of oil-based foam was investigated. The aggregation of SDBS surfactant formed micelles on the liquid film of the foam, enhancing the formation ability and stability. The HPAM polymer increased the coverage area of the co-adsorption layer, strengthening the stability. However, an increased HPAM concentration reduced the liquid film formation ability. These findings support the design of new defoaming processes.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Zhihua Wang, Bowen Shi, Yang Song
Summary: This study investigates the effect of operating conditions on wax/asphaltene deposition behavior in gas condensate reservoirs by using a cold plate device. The results show that the growth rate of wax deposition thickness initially stabilizes, then rises again, and finally slows down. On the other hand, the deposition rate of asphaltene is stable at first, then increases significantly, and gradually decreases after reaching the peak value. A diagram is developed to identify the deposition location in the wellbore, facilitating the removal of wax/asphaltene during production.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hang Dong, Runze Ma, Jian Zhao, Nan Guo, Zhihua Wang
Summary: The motion behaviors, rheological properties, and mechanical properties of a wax crystal mesoscale force chain network in gelation of waxy crude oil were studied experimentally and numerically. The relationship between the structure of the force chain network and the motion behaviors of the wax crystals and its rheological properties was analyzed. Results showed that as the temperature decreased, the motion velocity of wax crystals decreased, average coordination number increased, and viscosity of waxy crude oil increased. A complex and stable force chain network was observed during gelation.
Article
Energy & Fuels
Bowen Shi, Jiajun Hong, Zhihua Wang, Zhenbo Chang, Feng Li
Summary: This study investigates the behavior of paraffin deposition in gas-condensate wells through experiments and analysis, and establishes a paraffin deposition identification chart. The results show that paraffin crystal modifiers have a better preventive effect, achieving a paraffin prevention rate of 85-95%.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Energy & Fuels
Jian Zhao, Xiao-Feng Li, Hang Dong, Zhi-Hua Wang
Summary: An improved rheo-optic in situ synchronous measurement system was used to investigate the gelation behavior and mechanism of waxy crude oil emulsions. The microscopic mechanism and evolution of the microstructure during gelation process were obtained by combining transmitted natural light and reflected polarized light microscopy. The aggregation of emulsified water droplets was found to be significant and contributes to the formation and development of the wax crystals-emulsified water droplets coaggregate, leading to the evolution of the gelled microstructure. The correlation between viscoelasticity and microstructure evolution of waxy crude oil emulsions with different water contents was also discussed.
Article
Energy & Fuels
Zhi-Hua Wang, Xiao-Yu Liu, Hong-Qi Zhang, Yong Wang, Yun-Fei Xu, Bao-Liang Peng, Yang Liu
Summary: This study focuses on the decay kinetic characteristics of alkaline-surfactant-polymer-strengthened foams under the ultrasonic standing wave. The factors that affect the decay kinetics were discussed. The results showed that foam size, gas-liquid ratio, and surface tension influenced the collapse rate and volume fraction of the foams, and ultrasonic parameters had a significant impact on the decay behavior.