Salt-resistant high-temperature resistant hydrogel as well as preparation method and application thereof

A hydrogel and high temperature resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the needs of outdated oilfield development, complex contradictions in reservoir development, poor plugging effect, etc., to achieve anti-corrosion Strong water dilution, low cost, and good water resistance
CN109679604AActive Publication Date: 2019-04-26CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2019-04-26

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Abstract

The invention provides salt-resistant high-temperature resistant hydrogel as well as a preparation method and application thereof. The hydrogel consists of the following components in percentage by mass: 15-20% of a main agent, 0.10-0.20% of a cross-linking agent, 2-4% of a stabilizer, 0.1-0.5% of a pH value adjusting agent, 1-5% of a reaction controller and the balance of water, wherein the mainagent is polyvinyl alcohol; the cross-linking agent is formaldehyde, glutaraldehyde, terephthalaldehyde and m-phthalaldehyde; the stabilizer is nano-grade SiO2 granules; the sum of mass percentages ofthe components is 100%. The hydrogel provided by the invention forms a three-dimensional net structure through low molecular weight polyvinyl alcohol through cross-linking, is excellent in temperature and salt resistance, and plays an effective blocking role in an oil pool environment of which the temperature is 130 DEG C and the mineralization degree is 22*10<4>mg / L.
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Description

Technical field:

[0001] The invention relates to a salt-resistant and high-temperature resistant hydrogel, a preparation method and application thereof, and belongs to the technical field of oil field chemistry. Background technique:

[0002] Water production from oil wells is a common problem in the process of water flooding oilfield development. Due to the heterogeneity of the primary and secondary formations, the difference in fluid mobility and other reasons, a dominant channel of water flow is formed in the formation, resulting in water cones, water channeling, and water fingering, causing some oil wells to see water prematurely or flood out. drive inefficient or ineffective cycles. Profile control and water shutoff technology has always been an effective means for oilfields to improve water injection development effects and achieve stable production of oil reservoirs. However, with the development of the oil field, the characteristics and environment of the oil reser...

Claims

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