Development of Selective Water Plugging Interfacial Gel

doi:10.3969/j.issn.1006-6535.2023.03.020

Abstract

Abstract: In response to the disadvantages of poor oil-water selectivity and high injection pressure of high polymer selective water plugging gels, small-molecule gel factors were synthesized through the acid-amine neutralization reaction between N,N-dimethylcyclohexylamine and stearic acid, arachidic acid and behenic acid respectively, which can spontaneously form interfacial gels at the oil-water interface. The microscopic appearance and rheological properties of the interfacial gels were investigated by polarizing microscope and rheometer, and the selective water plugging performance of the small-molecule gel factor at the oil-water interface was investigated by displacement experiments. The results show that the viscosity of the interfacial gel formed by the small-molecule gel factor at the oil-water interface can reach 105 mPa·s or more, and the yield stress is as high as 100 Pa; the displacement experiment proves that the small-molecule gel factor can selectively block the water channel, the breakthrough pressure gradient is up to 2.74 MPa/m, and the recovery rate is enhanced by 21.3 percentage points. The small-molecule gel factor has good oil-water selectivity and can effectively enhance the recovery of crude oil, so it is worth to be promoted and applied.

Key words: selective water plugging, small-molecule gel factor, interfacial gel, fatty acid

CLC Number:

TE39

Li Jun, Wang Li, Li Yong, Chen Qilong, Wang Sha, Lu Hongsheng. Development of Selective Water Plugging Interfacial Gel[J]. Special Oil & Gas Reservoirs, 2023, 30(3): 155-160.

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