Cross-linked polymer microsphere as well as preparation method and application thereof

A technology of cross-linked polymers and polymers, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of weak shear resistance and poor deep plugging performance, and achieve enhanced plugging performance and improved Moderate effect of shear resistance and water expansion ratio
CN112062899AActive Publication Date: 2020-12-11CHINA UNIV OF PETROLEUM (BEIJING) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Publication Date
2020-12-11

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Abstract

The invention discloses a cross-linked polymer microsphere as well as a preparation method thereof. The cross-linked polymer microsphere is prepared by adopting an inverse emulsion method, and the preparation method comprises the following steps: by taking an aqueous solution of a polymer monomer, an initiator and a cross-linking agent as an aqueous phase, adding an oil phase containing an emulsifier into the aqueous phase, stirring to form an emulsion taking oil as an external phase, and reacting to obtain the cross-linked polymer microsphere. The polymer monomer is a mixture of acrylamide, 2-acrylamide-2-methyl propanesulfonic acid and octadecyl acrylate in a mass ratio of 6:(0-3):(1-2), and the cross-linking agent is bisphenol propane and formaldehyde in a mass ratio of (1.5-2):1, and the mass fraction of the cross-linking agent in the water phase is 0.1%-1.5%. The cross-linked polymer microsphere has the advantages that the cross-linked polymer microsphere is good in shear resistance and other stability, the defects that an existing polymer microsphere is high in water absorption expansion rate, large in water absorption expansion multiple and poor in shear resistance are overcome, and the cross-linked polymer microsphere has wide application prospects in the field of deep profile control of oil reservoirs.
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Description

technical field

[0001] The invention belongs to the field of oil and gas field development and enhanced recovery, and specifically relates to a cross-linked polymer microsphere and a preparation method and application thereof. Background technique

[0002] Due to the horizontal and vertical heterogeneity of the reservoir, the difference in oil-water viscosity and the imperfection of the injection-production well pattern, during the water injection development process of the oilfield, serious dominant seepage channels will be formed between the injection-production wells, resulting in a decrease in the utilization rate of injected water , The overall water cut increases, which reduces the degree of oil recovery and development benefits. Therefore, it is necessary to study the technology of profile control and control and flooding in high water-cut oilfields, expand the swept volume of injected water, and improve oil recovery and development benefits.

[0003] At present, the...

Claims

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