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公开(公告)号：US11567018B2
公开(公告)日：2023-01-31
申请号：US17580687
申请日：2022-01-21
发明人： Huajie Liu , Yuhuan Bu , Shenglai Guo , Chang Lu , Xinyang Guo , Shengda Shen , Rui Ma
摘要： A performance evaluation device and a design method of a cement for well cementing in a penetrated hydrate layer are provided. The performance evaluation device includes an equivalent wellbore, an inner circulation system, an outer circulation system, a thermal insulation cover, a bracket, a temperature sensing system, and a cement mold. The device can simulate a true downhole situation, conduct an evaluation experiment on the heat insulation performance of a cementing cement, and conduct experiments at different temperatures with automatic temperature control. The design method is to use a low-hydration, early-strength, and heat-insulating cement slurry system during the well cementing in a penetrated hydrate layer, where the low-hydration and early-strength characteristics ensure the effective sealing of a hydrate layer during a cementing process, and the heat insulation characteristic results in low heat conductivity and thus can ensure the stability of a hydrate layer during a production operation.
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2.发明授权公开(公告)号：US11136490B2
公开(公告)日：2021-10-05
申请号：US16495841
申请日：2018-05-25
发明人： Yuhuan Bu , Chunyu Wang , Huajie Liu , Leiju Tian , Xinyang Guo
IPC分类号： C09K8/487 , C08F220/34 , C08K3/30 , C08K5/20 , C08K5/09
摘要： A pH sensitive water-absorbent resin suitable for oil well cement slurry and an application thereof are provided. The pH sensitive water-absorbent resin includes distilled water, a monomer, a mixed auxiliary agent, a crosslinking agent and an initiator, the amount of the monomer is 30% to 100% of the mass of the distilled water, the amount of the mixed auxiliary agent is 16% to 67% of the mass of the monomer, the amount of the crosslinking agent is 0.2% to 1% of the mass of the monomer, and the amount of the initiator is 0.4 to 1% of the mass of the monomer.
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