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1.发明申请公开(公告)号：US20190330519A1
公开(公告)日：2019-10-31
申请号：US16254773
申请日：2019-01-23
发明人： Lijun MU , Xianwen LI , Hongjun LU , Yong WANG , Bin YAO , Zhenning JI , Suiwang ZHANG , Xiaobing LU , Zhiying DENG , Lei SUI , Erzhen WANG , Zhaojie SONG
摘要： The present invention provides a chelating agent for reservoir acidification and stimulating injection and its preparation method and application. The raw material composition of the chelating agent comprises: 10.0%-20.0% of methanesulfonic acid, 10.0%-20.0% of methanol, 10.0%-20.0% of polyaspartic acid, 10.0%-15.0% of epoxy succinic acid, 5.0%-10.0% of sodium cetyl sulfonate, 10.0%-15.0% of cetyltrimethylammonium bromide and the balance of water. The present invention also provides a preparation method of the above chelating agent. The chelating agent for reservoir acidification and stimulating injection of the invention is used in an acidizing and stimulating injection process, wherein it can effectively dissolve rock cracks, be used directly without need to be reversed.
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2.发明申请公开(公告)号：US20190136116A1
公开(公告)日：2019-05-09
申请号：US16235700
申请日：2018-12-28
发明人： Baoqiang LV , Lijun MU , Zhenfeng ZHAO , Hongjun LU , Xiangqian BU , Yin QI , Jianshan LI , Boping ZHAO , Xiangping LI , Jianhui LI , Li'an YANG , Jun BU
摘要： A low density, high-strength, degradable temporary plugging agent which includes 60% by weight to 85% by weight of polylactic acid, 5% by weight to 20% by weight of a starch, 5% by weight to 10% by weight of polycaprolactone, 2% by weight to 5% by weight of a solubilizing agent, and 2% by weight to 5% by weight of a toughening agent, based on 100% by weight of the total weight of the agent. The rigid agent can result in bridge plugging in existing cracks, with a significant increase in pressure. The preparation method is simple, the process requirements are low, and industrial production can be realized. When applied to temporary plugging fracturing, under formation conditions, it can be completely degraded within a certain period of time and will not cause secondary damage to the reservoir, while preventing the agent from polluting the formation and the occurrence of pump accidents.
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公开(公告)号：US20180187067A1
公开(公告)日：2018-07-05
申请号：US15857916
申请日：2017-12-29
发明人： Lei SUI , Suiwang ZHANG , Xiaobing LU , Hongjun LU , Lijun MU , Yong WANG , Zhaojie SONG , Zhiying DENG , Erzhen WANG
IPC分类号： C09K8/584 , E21B43/16 , C07F9/38 , C07C55/24 , C07C229/04
摘要： The present disclosure provides a pressure-reducing and injection-enhancing anti-scaling agent for low-permeability water-injection wells and a preparation method thereof The anti-scaling agent is prepared from starting materials comprising: 10 to 12 parts of non-ionic surfactant(s), 18 to 20 parts of hexasodium triethylenetetramine-N,N,N′,N″,N′″,N′″-hexaacetate, 5 to 8 parts of anionic surfactant(s), 6 to 8 parts of an organic phosphonic acid-carboxylic acid scale inhibitor, 2 to 5 parts of a dispersant, 15 to 18 parts of a diluent, 8 to 10 parts of an organic amine salt, and 30 to 36 parts of water. The pressure-reducing and injection-enhancing agent according to the present disclosure is characterized by having multiple functions in one agent. When used in an amount being 0.5% of the water injected to a water injection well, it shows excellent anti-swelling property, shrinking property, anti-corrosive property, and calcium sulfate and barium (strontium) sulfate scale resistance.
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