A Study on Improving Heavy Oil Recovery by Solvent Assisted Steam Flooding in Late Stage

doi:10.11885/j.issn.1674-5086.2021.05.19.02

Abstract

Abstract: This paper takes the Xing VI Group super-heavy oil reservoir in Block Du 84 of Liaohe Oilfield as the research object, and conducts an indoor evaluation study on solvent assist as a replacement technology to improve the efficiency of SAGD production. According to the current operating pressure in the SAGD steam chamber, hexane, which has a temperature similar to the steam dew point, was screened as an auxiliary additive for SAGD. In the laboratory, we first studied the evaluation of the viscosity reduction effect of heavy oil at different temperatures, solvent types and concentrations, and carried out comparison experiments of oil displacement efficiency between hexane-assisted steam flooding and pure steam flooding at different concentrations. Through solvent-assisted analysis of water cut, remaining oil saturation and final recovery improvement degree in the later stage of steam flooding, the influence of steam temperature and solvent concentration on steam flooding efficiency are revealed. The research results in this paper provide theoretical support for using solvents to assist in improving the efficiency of heavy oil recovery and optimizing on-site operating parameters in the later stage of SAGD development.

Key words: solvent assited steam flooding, steam flooding, heavy oil, enhanced oil recovery, physics experiments

CLC Number:

TE357

LIU Jiali, HUANG Siyuan, JIANG Qi, WANG Hongyuan, WANG Zhongyuan. A Study on Improving Heavy Oil Recovery by Solvent Assisted Steam Flooding in Late Stage[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(3): 98-108.

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