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公开(公告)号：US11891563B2
公开(公告)日：2024-02-06
申请号：US17469669
申请日：2021-09-08
申请人： YANGTZE UNIVERSITY
发明人： Huan Yang , Zhuyang Jiang , Xiaorong Yu , Gaoshen Su , Kailu Wang , Beibei Zhang , Yang Li , Chang Xiao
摘要： A pH-sensitive temporary plugging agent and its preparation method, and the use thereof in exploitation of a low-permeability oil reservoir are disclosed. The temporary plugging agent is prepared by raw materials including, in percentages by mass, 3-8% of carboxymethyl chitosan, 0.2-0.7% of gelatin, 0.1-0.6% of an initiator, 5-15% of a toughener, and a balance of water, wherein the initiator is a solution of AgNO3 in ammonia water having a concentration of 0.1-0.3 mol/L, and the toughener is a carboxyl-terminated hyperbranched polyester.
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公开(公告)号：US11472997B1
公开(公告)日：2022-10-18
申请号：US17412749
申请日：2021-08-26
申请人： Yangtze University
发明人： Gaoshen Su , Huan Yang , Xiaorong Yu , Qiang Li , Wenchuan Wu , Jieqiong Cheng , Chunyuan Wu , Zhixue Huang
摘要： The present disclosure provides a temperature-responsive self-degradable temporary plugging agent and a preparation method thereof as well as its application in plugging the wellbore, which relates to the technical field of oilfield exploitation. The temporary plugging agent provided in the present disclosure includes preparation raw materials of the following mass percentages: monomer 4-6%, crosslinker 0.2-1%, initiator 0.02-0.06%, degradation catalyst 0.05-0.1%, chain transfer agent 0.01-0.05%, and the balance water. The temporary plugging agent of the present disclosure is liquid before gelling, with a low viscosity and a good fluidity, and easy to be pumped. When being pumped into the wellbore, the temporary plugging agent may crosslink at the temperature of the reservoir section, with good gelling properties. At the end of the operations, it can be degraded by itself, without drilling tools, with no need for gel breaking, and with no need for additional degradation promoters.
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公开(公告)号：US20220333001A1
公开(公告)日：2022-10-20
申请号：US17469669
申请日：2021-09-08
申请人： YANGTZE UNIVERSITY
发明人： Huan Yang , Zhuyang Jiang , Xiaorong Yu , Gaoshen Su , Kailu Wang , Beibei Zhang , Yang Li , Chang Xiao
摘要： A pH-sensitive temporary plugging agent and its preparation method, and the use thereof in exploitation of a low-permeability oil reservoir are disclosed. The temporary plugging agent is prepared by raw materials including, in percentages by mass, 3-8% of carboxymethyl chitosan, 0.2-0.7% of gelatin, 0.1-0.6% of an initiator, 5-15% of a toughener, and a balance of water, wherein the initiator is a solution of AgNO3 in ammonia water having a concentration of 0.1-0.3 mol/L, and the toughener is a carboxyl-terminated hyperbranched polyester.
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4.发明授权公开(公告)号：US11479714B2
公开(公告)日：2022-10-25
申请号：US17341528
申请日：2021-06-08
申请人： Yangtze University
发明人： Xiaorong Yu , Huan Yang , Gaoshen Su , Wei Wang
摘要： The present disclosure relates to a profile control and oil displacement agent for an oil reservoir and a preparation method thereof. The profile control and oil displacement agent is prepared by uniformly dispersing polymer microspheres, an activator and a solvent. The polymer microspheres are micron-sized dry-powdered microspheres, which are prepared by stirring and polymerizing a first monomer, a second monomer, an initiator, a hydrophobic nano-powder and water in a specific proportion. The profile control and oil displacement agent of the present disclosure can reduce the oil-water interfacial tension, has good long-term stability, simple preparation and low cost, avoids solvent waste, and can be applied to the deep profile control and oil displacement system of oil fields.
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5.发明申请公开(公告)号：US20220064517A1
公开(公告)日：2022-03-03
申请号：US17341528
申请日：2021-06-08
申请人： Yangtze University
发明人： Xiaorong Yu , Huan Yang , Gaoshen Su , Wei Wang
IPC分类号： C09K8/588
摘要： The present disclosure relates to a profile control and oil displacement agent for an oil reservoir and a preparation method thereof. The profile control and oil displacement agent is prepared by uniformly dispersing polymer microspheres, an activator and a solvent. The polymer microspheres are micron-sized dry-powdered microspheres, which are prepared by stirring and polymerizing a first monomer, a second monomer, an initiator, a hydrophobic nano-powder and water in a specific proportion. The profile control and oil displacement agent of the present disclosure can reduce the oil-water interfacial tension, has good long-term stability, simple preparation and low cost, avoids solvent waste, and can be applied to the deep profile control and oil displacement system of oil fields.
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