Mechanism of Nitrogen Stimulation Assisted by Common Heavy Oil Viscosity Reducer

doi:10.3969/j.issn.1006-6535.2021.04.012

Abstract

Abstract: To address the issues on indefinite production characteristics and unclear synergistic mechanism of reaction between viscosity reducer and nitrogen during nitrogen stimulation assisted by common heavy oil viscosity reducer, the microscopic distribution characteristics of fluid and the mechanism of viscosity reducer in the stimulation process were discovered by microscopic visual experiments and physical simulation to compare and study the production characteristics of nitrogen stimulation assisted by common heavy oil viscosity reducer. The results showed that in the nitrogen stimulation assisted by common heavy oil viscosity reducer, the viscosity reducer effectively dispersed crude oil and nitrogen to form oil-in-water emulsion and a small amount of foam, and the Jamin effect of the emulsion and foam effectively inhibited gas channeling to enlarge the affected area, extend the action time of elastic energy of gas and prolong the effective nitrogen stimulation cycle, and the oil recovery was improved by 6.5 percentage points with nitrogen stimulation assisted by common heavy oil viscosity reducer in the indoor experiments. The study results are conducive to further clarifying the principles of viscosity reducer selection and provide a reference for the field application of nitrogen stimulation assisted by viscosity reducer.

Key words: nitrogen stimulation, common heavy oil, production characteristics, viscosity reducer, crude oil properties

CLC Number:

TE345

Li Binfei, Zang Yunong, Liu Xiaobo, Huang Yongmei, Li Haifeng, Zhu Jianjun, Lu Xiaojuan. Mechanism of Nitrogen Stimulation Assisted by Common Heavy Oil Viscosity Reducer[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 88-95.

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