交联聚醚破乳剂对胜利油田二元驱采出液破乳性能研究

doi:10.3969/j.issn.2097-2806.2024.07.006

Abstract

Abstract:

In view of the difficulties in breaking the emulsion produced by surfactant/polymer flooding in Shengli oilfield, the cross-linked polyether demulsifiers D-BP, D-TA and D-PA were prepared by cross-linking polyether demulsifiers with dewatering function for water-in-oil （W/O） emulsion and polyether demulsifier with oil-removal function for oil-in-water （O/W） emulsion. The interfacial activities of the three cross-linked polyether demulsifiers were investigated. Their effects on the oil-water interfacial film of emulsions were examined, and their emulsion-breaking effects on W/O and O/W emulsions were explored. The results showed that among the three cross-linked polyether demulsifiers, D-PA with hyperbranched structure had the strongest adsorption at the oil-water interface and showed the highest interfacial activity. D-PA had the greatest effect on the oil-water interfacial film formed by the kerosene-diluted crude oil and produced water. The new film formed after D-PA adsorption at the oil-water interface had the lowest interfacial dilatational modulus. The dewatering rate of W/O emulsion by D-PA was 94.4%, and the oil removal rate for O/W emulsion from the same oilfield reached 98.1%. More importantly, the D-PA demulsifier was capable of simultaneously treating complex emulsions containing W/O and O/W types. The comprehensive dewatering rate by D-PA for the emulsion produced by surfactant/polymer flooding containing W/O and O/W was above 98%, and the oil content of the effluent after treated was less than 30 mg/L. The retention rate of polymer （HPAM） reached 94.8%, and the oil-water interface was neat and without emulsified intermediate layer.

Key words: produced liquid of surfactant/polymer flooding, cross-linked polyether demulsifier, emulsion breaking, polymer

CLC Number:

TE357.6

Limei Sun, Haifeng He, Shenfa An, Zhiyong Luan, Peng Sun, Yang Wang, Feng Yan. Study on the emulsion-breaking performance of cross-linked polyether demulsifiers for the emulsion produced by surfactant/polymer flooding in Shengli oilfield[J].China Surfactant Detergent & Cosmetics, 2024, 54(7): 795-802.

Figures/Tables 6

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Study on the emulsion-breaking performance of cross-linked polyether demulsifiers for the emulsion produced by surfactant/polymer flooding in Shengli oilfield

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