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公开(公告)号：US11384274B2
公开(公告)日：2022-07-12
申请号：US16910132
申请日：2020-06-24
发明人： Tomoya Fujita , Takahiro Saka , Chizuko Furo
摘要： The diverting agent of the present invention contains resin particles of polyvinyl alcohol-based resin. The resin particles of polyvinyl alcohol-based resin are a particle mixture containing two or more types of resin particles having different particle diameters, and the diverting agent contains resin particles A of polyvinyl alcohol-based resin having a particle diameter of 1,700 μm or more in a range of 5 mass % to 95 mass % and resin particles B of polyvinyl alcohol-based resin having a particle diameter of 250 μm to 1,000 μm in a range of 5 mass % to 95 mass %.
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公开(公告)号：US12071584B2
公开(公告)日：2024-08-27
申请号：US17352693
申请日：2021-06-21
IPC分类号： C09K8/508
CPC分类号： C09K8/5083
摘要： An object of the present invention is to provide a diverting agent that can exhibit sufficient filling properties against a fracture in a well in an excavation method using a hydraulic fracturing method, and that is excellent in solubility after a predetermined period of time has passed. The diverting agent of the present invention contains a polyvinyl alcohol-based resin having an average polymerization degree of 1000 or more.
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公开(公告)号：US12077697B2
公开(公告)日：2024-09-03
申请号：US18090917
申请日：2022-12-29
发明人： Kazutoshi Tsuji , Norihito Sakai , Tomoya Fujita , Takahiro Saka , Chizuko Furo
CPC分类号： C09K8/725 , C08F16/06 , C09K8/68 , E21B43/26 , E21B43/261
摘要： A problem to be solved of the present invention is to provide a diverting agent which gradually dissolves in water. The present invention relates to a diverting agent containing a polyvinyl alcohol-based resin and a method of filling a fracture using the diverting agent.
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公开(公告)号：US12054667B2
公开(公告)日：2024-08-06
申请号：US17354385
申请日：2021-06-22
IPC分类号： C08F216/06 , C08F220/02 , C09K8/508
CPC分类号： C09K8/5083 , C08F216/06 , C08F220/02
摘要： A diverting agent is provided that exhibits sufficient filling properties against a fracture in a well because of swelling without complete dissolution for a certain period of time (about 30 minutes to 5 hours), and that quickly dissolves and can be removed even at a low temperature of 40° C. to 60° C. after a certain period of time has passed. Also provided is a diverting agent that contains a modified polyvinyl alcohol-based resin.
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公开(公告)号：US12110450B2
公开(公告)日：2024-10-08
申请号：US17352693
申请日：2021-06-21
IPC分类号： C09K8/508
CPC分类号： C09K8/5083
摘要： An object of the present invention is to provide a diverting agent that can exhibit sufficient filling properties against a fracture in a well in an excavation method using a hydraulic fracturing method, and that is excellent in solubility after a predetermined period of time has passed. The diverting agent of the present invention contains a polyvinyl alcohol-based resin having an average polymerization degree of 1000 or more.
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公开(公告)号：US11230659B2
公开(公告)日：2022-01-25
申请号：US16910172
申请日：2020-06-24
发明人： Takahiro Saka , Masaya Nakai
IPC分类号： C09K8/508 , E21B33/138
摘要： A filling material for underground treatment of the present invention contains at least one polyvinyl alcohol-based resin of a modified polyvinyl alcohol-based resin and an unmodified polyvinyl alcohol, and a swelling ratio of the polyvinyl alcohol-based resin after immersion in water at a temperature of 80° C. for 30 minutes is 250% to 900%. The filling material for underground treatment has enhanced swelling performance, is effective in preventing phenomena such as lost circulation, and has improved workability of filling a well drilled part with the filling material.
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公开(公告)号：US11597870B2
公开(公告)日：2023-03-07
申请号：US16782415
申请日：2020-02-05
发明人： Kazutoshi Tsuji , Norihito Sakai , Tomoya Fujita , Takahiro Saka , Chizuko Furo
摘要： A problem to be solved of the present invention is to provide a diverting agent which gradually dissolves in water. The present invention relates to a diverting agent containing a polyvinyl alcohol-based resin and a method of filling a fracture using the diverting agent.
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