Insight into the Injection Rate Effects on Residual Liquid Film in Tight Sandstone Nanopore

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Zhinan Liu, Xiang Wang, Guicai Zhang, Rongkai Yuan
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Abstract

Waterflooding in tight reservoirs is a key focus in the recent oilfield development, making it essential to accurately assess the injection rate effect in tight sandstone. This study investigates the relationship between injection rate and residual liquid film (water and oil film) thickness, as well as the underlying mechanisms, by conducting oil-driven water experiments combined with molecular dynamics simulations. The morphology of the liquid film formed under different injection rates serves as the primary focus of this research. The experimental results indicate that as the oil injection rate increases, the volume of stagnant water and bound water gradually decreases and stabilizes. Molecular dynamics simulations results reveal that the displacement process can be categorized into three stages: a rapid injection stage, a slow injection stage, and a smooth injection stage. In the oil-driven water system, the thickness of the final water film is more uniform. As the injection rate increases, the recovery rate gradually decreases. However, once the injection rate reaches a certain threshold, the rate of decline in recovery rate slows down. This study provides a theoretical foundation and reference data for selecting optimal injection rates in waterflooding operations for tight reservoirs, contributing to improved recovery rate and velocity.

Abstract Image

洞察注入速率对致密砂岩纳米孔中残留液膜的影响
致密砂岩油藏注水开发是近年来油田开发的一个重点问题,因此准确评估致密砂岩注水速度效应至关重要。本研究通过油驱水实验与分子动力学模拟相结合的方法,探讨了注入速率与残余液膜(水膜和油膜)厚度的关系及其作用机制。在不同注射速率下形成的液膜形态是本研究的主要重点。实验结果表明,随着注油速率的增加,滞水和束缚水体积逐渐减小并趋于稳定。分子动力学模拟结果表明,驱替过程可分为快速注入阶段、缓慢注入阶段和平稳注入阶段。在油驱水系统中,最终水膜的厚度更均匀。随着注入速率的增加,采收率逐渐降低。但是,一旦注入速度达到一定的阈值,采收率下降的速度就会减慢。该研究为致密储层水驱优选注入量提供了理论依据和参考数据,有助于提高采收率和速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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