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公开(公告)号：US10584276B2
公开(公告)日：2020-03-10
申请号：US16392315
申请日：2019-04-23
申请人： CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) , CHINA UNIVERSITY OF GEOSCIENCES (BEIJING) , SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE LTD., PETRO CHINA
发明人： Caili Dai , Mingwei Gao , Mingwei Zhao , Qing You , Guang Zhao , Yining Wu , Yongpeng Sun , Lin Li , Yifei Liu , He Liu , Xin Wang , Baoshan Guan
摘要： A CO2-sensitive fracturing and displacement fluid contains a surfactant, an auxiliary agent, water, and CO2, wherein CO2 is liquid and/or supercritical CO2. The CO2-sensitive fracturing and displacement fluid provided by the invention does not flow back after completion of fracturing construction, and the gel breaking fluid displacement is carried out after soak for a period of time to improve the tight oil recovery ratio. The CO2-sensitive fracturing and displacement fluid exerts the “one-agent multi-purpose” function of sand carrying, CO2 energization and oil displacement, surfactant imbibition and oil discharge of a fracturing-displacement system in different development and production stages, and achieves the dual goals of expanding the utilization degree of tight oil and improving the displacement efficiency of the tight oil, which can effectively reduce costs and achieve the goal of unified, highly efficient and green development of oil and gas fields.
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公开(公告)号：US10414969B2
公开(公告)日：2019-09-17
申请号：US16233727
申请日：2018-12-27
申请人： China University of Petroleum (East China) , China University of Geosciences (Beijing) , Oil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company
发明人： Guang Zhao , Caili Dai , Qing You , Sen Wang , Hai'en Yang , Ping Yi , Lin Li
摘要： The present invention relates to the field of profile control and flooding in oil fields, particularly to a colloidal nano-graphite-strengthened bulk gel system for dispersed particle gel, and composition thereof. The composition for bulk gel system, containing a polymeric matrix, a resin cross-linking agent, a coagulant, and colloidal nano-graphite, wherein, with respect to 100 parts by weight of the polymeric matrix, a content of the resin cross-linking agent is 30-150 parts by weight, a content of the coagulant is 5-100 parts by weight, and a content of the colloidal nano-graphite is 3-30 parts by weight; wherein, the polymeric matrix is partially hydrolyzed polyacrylamide with weight-average molecular weight within a range of 5,000,000-8,000,000 g/mol; the coagulant is one or more of chloride salt coagulant and alcohol amine coagulant. The specific components in the composition for dispersed particle gel in the present invention have excellent compatibility with each other, and can form a high-strength bulk gel system within 3-6h at 85-95° C., and the obtained dispersed particle gel has relatively high temperature-resistance and salinity-resistance properties.
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公开(公告)号：US12024975B2
公开(公告)日：2024-07-02
申请号：US18297419
申请日：2023-04-07
发明人： Yifei Liu , Caili Dai , Guang Zhao , Chenwei Zou , Ning Yang , Qing You , Mingwei Zhao , Yining Wu , Lin Li , Yongpeng Sun
CPC分类号： E21B33/13 , C09K8/5086 , C09K8/512 , C09K8/584
摘要： The invention relates to the field of oilfield development engineering, and discloses a self-growing gel dispersion active fluidity control system and a fluid channeling control method for a low-permeability-tight reservoir. The system contains 100 parts by weight of a self-growing gel dispersion and 0.15-0.6 part by weight of a surfactant, the self-growing gel dispersion is prepared by shearing and grinding nano-reinforced chromium-aldehyde double-group cross-linked integral gel, and the preparation method of the nano-reinforced chromium-aldehyde double-group cross-linked integral gel comprises the following steps: adding a functional polymer, a phenolic resin cross-linking agent, are organic chromium cross-linking agent and a nano-reinforcer into water, mixing, and curing. The system can be simply and rapidly prepared, is easy for deep injection by adjusting the size of gel dispersion particles, is wide in action range, high in stability and long in effective period of action, can avoid reservoir pollution, and does not affect the liquid production capacity of the reservoir. The gel dispersion particles can achieve self-growth in the low-permeability-tight reservoir fractures, and the fracture fluid channeling control effect is enhanced.
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4.发明授权公开(公告)号：US11873447B1
公开(公告)日：2024-01-16
申请号：US18353656
申请日：2023-07-17
发明人： Mingwei Zhao , Caili Dai , Zhongzheng Xu , Yining Wu , Mingwei Gao , Lin Li , Guang Zhao
CPC分类号： C09K8/584 , C09K8/592 , B82Y30/00 , B82Y40/00 , C09K2208/10 , C09K2208/28
摘要： The present disclosure discloses superhydrophobic nanoparticles and a preparation method therefor, and a superhydrophobic nanofluid.
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公开(公告)号：US11427748B2
公开(公告)日：2022-08-30
申请号：US17528370
申请日：2021-11-17
发明人： Caili Dai , Lin Li , Jiawei Liu , Zhongzheng Xu , Guang Zhao , Mingwei Zhao , Yining Wu , Yongpeng Sun
IPC分类号： C09K8/512 , C08F220/56 , C09K8/516
摘要： A mussel bionic gel composition includes: a mussel bionic copolymer and/or a mussel bionic compound, a cross-linking agent and water, wherein the mussel bionic copolymer includes a structural unit A from a vinyl monomer and a structural unit B from a vinyl-containing mussel bionic catechol group monomer; and the mussel bionic compound includes polyacrylamide and a mussel bionic catechol compound. The self-growth gel particle profile control and water plugging agent prepared from the composition is low in initial apparent viscosity, easy to inject and far in migration, has good shear repairing performance and is particularly applicable to a low-permeability fractured reservoir, thereby adjusting a micro-fracture network, improving a fracture channel and increasing waterflood efficiency and recovery efficiency.
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6.发明申请公开(公告)号：US20190249068A1
公开(公告)日：2019-08-15
申请号：US16233727
申请日：2018-12-27
申请人： China University of Petroleum (East China) , China University of Geosciences (Beijing) , Oil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company
发明人： Guang Zhao , Caili Dai , Qing You , Sen Wang , Hai'en Yang , Ping Yi , Lin Li
CPC分类号： C09K8/516 , C09K8/5045 , C09K8/5083 , C09K8/512 , C09K2208/10
摘要： The present invention relates to the field of profile control and flooding in oil fields, particularly to a colloidal nano-graphite-strengthened bulk gel system for dispersed particle gel, and composition thereof. The composition for bulk gel system, containing a polymeric matrix, a resin cross-linking agent, a coagulant, and colloidal nano-graphite, wherein, with respect to 100 parts by weight of the polymeric matrix, a content of the resin cross-linking agent is 30-150 parts by weight, a content of the coagulant is 5-100 parts by weight, and a content of the colloidal nano-graphite is 3-30 parts by weight; wherein, the polymeric matrix is partially hydrolyzed polyacrylamide with weight-average molecular weight within a range of 5,000,000-8,000,000 g/mol; the coagulant is one or more of chloride salt coagulant and alcohol amine coagulant. The specific components in the composition for dispersed particle gel in the present invention have excellent compatibility with each other, and can form a high-strength bulk gel system within 3-6 h at 85-95° C., and the obtained dispersed particle gel has relatively high temperature-resistance and salinity-resistance properties.
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