Article
Energy & Fuels
Wang Mingxing, Wang Jia, Cheng Fushan, Chen Xiaolu, Yang Xuda, Lv Wenjing, Wang Bo
Summary: Fracture mouth temporary plugging and diverting fracturing (TPDF) technology involves using degradable diverters to plug previously created fractures and increase wellbore pressure, diverting subsequent injection fluids to under-stimulated zones and improving overall stimulation effects.
Article
Thermodynamics
Zhanxi Pang, Luting Wang, Fanghao Yin, Xiaocong Lyu
Summary: The study quantitatively analyzed the steam chamber expanding and bottom water invading during steam flooding, and identified the moment of water invading and the four stages of steam flooding. The results showed the changes in water coning shape and oil components during steam flooding.
Article
Polymer Science
Nanjun Lai, Yongqiang Tian, Junqi Wang, Hongwei Xu, Lei Tang
Summary: Response surface methodology (RSM) was used to optimize the preparation of a supramolecular gel temporary plugging agent. The results showed that the optimized gel had good plugging capacity and less damage to the formation. The formation mechanism and performance of the gel were investigated, and a prediction model between each component and supramolecular gel was established.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Xuejiao Li, Meilong Fu, Jie Liu, Qi Xiao, Wenhao Tang, Guike Yang
Summary: This study successfully synthesized a gel plugging agent with good thermal stability and high salinity adaptability, suitable for reservoirs with high temperatures and high salinity such as the Tahe oil field.
Article
Energy & Fuels
Yali Liu, Chao Zhang, Quan Wen, Zhaomin Li, Mingzhe Song
Summary: In this study, a heat-resistant CO2 foam was prepared and its profile control effect in old oilfields was verified through experiments, leading to an increased oil recovery rate.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Xianbin Huang, Xu Meng, Kaihe Lv, Zhen Zhang, Lihu Cao, Ren Wang, Jie Feng, Yicheng Wu, Wenbo Sheng
Summary: In this study, a functionalized polystyrene latex (FPL) was synthesized as a nano-plugging agent (NPA) for drilling fluids. The particle size and thermal stability of FPL were characterized, and its plugging performance on various filter media was investigated. The results showed that FPL had good temperature resistance and could effectively reduce fluid loss. This study provides valuable insights for the development and evaluation of high-temperature NPAs.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Thermodynamics
Renfeng Yang, Ruizhong Jiang, Sheng Guo, Han Chen, Shasha Tang, Rui Duan
Summary: The study shows that water plugging treatment during high water-cut periods is an effective development strategy to reduce production decline, but the determination of the appropriate water-cut for plugging treatment still lacks research, relying on experience may lead to potential losses. It is found that lower oil viscosity results in a lower critical plugging water-cut, indicating that water plugging treatment is not suitable for all types of reservoirs.
Article
Biochemistry & Molecular Biology
Jiqiang Zhi, Yikun Liu, Jinfeng Chen, Lifeng Bo, Guohui Qu, Nan Jiang, Weizhong He
Summary: This study targeted high-temperature and highly saline old oil fields, developed a hydrophobic functional monomer-polymer with temperature and salt resistance, and investigated its characteristics such as infective property, plugging performance, and liquid flow ability. The weak gel system exhibited good temperature and salt resistance and showed significant improvement in water absorption and blocking rate under various permeability conditions.
Article
Energy & Fuels
Lihui Wang, Siyuan Li, Ruibo Cao, Peihui Han, Wei Yan, Gang Sun, Huifen Xia, Tianhan Xu
Summary: Novel pre-crosslinked gel particles were synthesized to form a new heterogeneous composite system with a weak alkaline-surfactant-polymer (ASP) system. The microscopic visualization model and advanced testing methods were used to describe the microscopic morphology of the gel particles and their retention state in the porous medium, revealing the microscopic plugging mechanism of the novel composite system. The results showed that the pre-crosslinked gel particles had improved properties and could enhance interfacial tension stability while reducing chemical usage. In the experiments, the recovery rate of the heterogeneous composite flooding system was 7.3% higher than that of ASP.
Article
Energy & Fuels
Zhi-Yong Wang, Mei-Qin Lin, Huai-Ke Li, Zhao-Xia Dong, Juan Zhang, Zi-Hao Yang
Summary: The research investigates the profile control and oil displacement characteristics of polymer nanoparticles after high temperature swelling. Experimental results show that the polymer nanoparticles can effectively plug high-permeability layers and increase oil recovery under certain conditions.
Article
Materials Science, Multidisciplinary
Dalong Sun, Yang Yang, Wenjing Ma, Shuangxiang Ye, Hao Zhang, Jiang Zhang, Bin Yang
Summary: A heat-resistant hydrogel (HT-Gel) composed of a terpolymer (PAAA) and chromium (III) acetate was developed in this study for lost circulation control in high-temperature and high-pressure formations. The HT-Gel exhibited exceptional thermal stability, pressure-bearing performance, and resistance to shear and contamination.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Thermodynamics
Yunfeng Zai, Hanzhong Tao, Jingjing Zhao, Wei Li, Jianjie Cheng, Yannan Li
Summary: In this paper, a three-dimensional CFD model is used to study condensation heat and mass transfer in an inclined circular tube, considering flooding and liquid bridge. Different pipe inclination angles and contact angles are investigated, and it is found that the liquid bridge position moves upward with increasing inclination angle under high liquid film Reynolds number and condensation conditions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Polymer Science
Yuchen Wen, Jirui Hou
Summary: Gas flooding and foam flooding are potential technologies for tertiary oil recovery in fractured-vuggy reservoirs. This study established a visualization simulation method from one dimension to three dimensions and conducted experiments to validate its application in fractured-vuggy reservoirs. The experimental results showed that gas flooding has a single flow channel, water flooding has multiple flow channels, and gel foam can uniformly expand in all directions. The EOR mechanisms of gel foam in fractured-vuggy reservoirs include reducing interfacial tension, increasing mobility ratio, selectively plugging high permeability channels, and discontinuous flow. Therefore, water and gas should be injected in the displacement process of fractured-vuggy reservoirs, and gel foam with strong stability and high viscosity is recommended for most injection wells.
Article
Materials Science, Multidisciplinary
Longhao Tang, Tingyi Wang, Huifang Song, Mingming Xu, Yingbiao Xu, Yuanyuan Wang
Summary: Polymers with shape memory property and gel with resistance to high temperature can be combined to overcome their respective shortcomings in plugging formation. The addition of shape memory polymer (SMP) particles can enhance the mechanical strength of the system, while the viscosity gel can stabilize the bridging structure formed by the SMP particles at cracks. This composite of SMP and gel shows great potential as a plugging material.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Energy & Fuels
Yang Bai, Lingfeng Wu, Pingya Luo, Daoxiong Li
Summary: This paper analyzes and studies the serious problem of malignant leakage formations and summarizes a method for preparing a gel plugging agent. The experimental results show that the gel has good compatibility with drilling fluid, controllable gel formation time, and good gel breaking performance, which can meet the requirements for plugging malignant leakage formations.
FRONTIERS IN ENERGY RESEARCH
(2022)
