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

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.

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...

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Problems solved by technology

However, with the development of the oil field, the characteristics and environment of the oil reservoir are constantly changing, especially after the oil reservoir enters the high water-cut production period, the long-term water flooding will make the development of the oil reservoir more complicated. The existing profile control and water shutoff technology, especially the effective application technology always lags behind the needs of oilfield development

For some high-temperature and high-salinity deep well reservoirs in my country, the reservoir temperature is as high as 130°C, and the reservoir salinity is as high as 22×10 4 mg / L, because common blocking agents such as partially hydrolyzed polyacrylamide jelly are prone to hydrolysis at high temperatures, and Ca 2+ , Mg 2+ Easy to harden, making the plugging effect worse

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