致密油藏表面活性剂渗吸影响因素研究

doi:10.3969/j.issn.2097-2806.2023.08.001

Abstract

Abstract:

Tight reservoirs always show poor physical properties, resulting in difficulties to be effectively exploited by conventional water flooding. Imbibition with surfactant solutions is the main means for exploitation of tight reservoirs. In this work, the effects of rock wettability, surfactant types, interfacial tension （IFT） of imbibition solutions, oil viscosities, temperature and surfactant slug combinations on imbibition efficiencies were studied with Changqing tight outcrop cores by Amott cells. The results showed that, the higher the wettability of the rock was, the higher the imbibition recovery would be obtained. The imbibition recovery of different types of surfactants was decreased in the sequence: anionic surfactants>nonionic surfactants>cationic surfactants. When the oil-water IFT of imbibition liquid was at the level of 10^-1 mN/m, the imbibition efficiency was the highest. Reducing the viscosity of crude oil and increasing temperature were both beneficial to the imbibition recovery. The earlier the surfactant imbibition was carried out, the higher the imbibition efficiency was. In addition, the imbibition efficiency could be further improved by using ultra-low IFT imbibition solution after primary imbibition with non-ultra-low IFT imbibition solutions.

Key words: tight reservoir, surfactant, imbibition, interface tension

CLC Number:

TQ423

Xu Derong,Lian Wei,Xiong Jinzhao,Kang Wanli. Research on the influence factors of surfactant imbibition in tight reservoirs[J].China Surfactant Detergent & Cosmetics, 2023, 53(8): 857-864.

Figures/Tables 14

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References 14

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Parameters	Value
Diameter/cm	2.5±0.1
Length/cm	3±0.1
Porosity/%	9-11
Permeability/mD	0.1-0.3
Median pore radius/μm	0.615

Imbibition solutions	IFT/（mN/m）	Contact angle/ （°）
0.05% SDS	2.13	45
0.05% KD+0.05% SDS	0.11	40
0.2% KD	0.204	37
0.05% KD	0.000 8	45

Simulation oil number	Crude oil content/%	Viscosities/（mPa·s）
Simulation oil number	Crude oil content/%	45 ℃	85 ℃
#1	5	2.1	1.1
#2	80	8.5	2.1

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Research on the influence factors of surfactant imbibition in tight reservoirs

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