Control Mechanism and Parameter Simulation of Oil-Water Properties on Spontaneous Imbibition Efficiency of Tight Sandstone Reservoir

Dazhong Ren,Jing Tao,Dengke Liu,Litao Ma,Xueqing Liu,Rongjun Zhang

doi:10.3389/fphy.2022.829763

Abstract

Spontaneous imbibition is an effective method of tight sandstone reservoirs development. However, their underlying mechanisms are still unclear due to the representative issue caused by strong heterogeneity and complex oil-brine properties. In this research, physical properties and thin-section images were systematically analyzed, and the spontaneous imbibition efficiency was examined from core tests. The results show that quartz and feldspar predominantly contribute to mineralogy. Low brine salinity, high oil viscosity, and high interfacial tension corresponded to strong spontaneous imbibition ability and fast process. High interfacial tension is the dominant controlling factor in this field. Furthermore, the parameter simulation model established by the dimension reduction method could catalyze the prediction of spontaneous imbibition efficiency, which is confirmed by higher reliability.

Highlights

With the advancement of petroleum development, tight oil, an unconventional oil resource, has become a research hot spot that has received increasing attention [1]
Focusing on the lacustrine Lower Triassic Yanchang Formation tight sandstones in the Southwestern Ordos Basin, this study investigated surfactant, salinity, temperature, oil viscosity, and spontaneous imbibition efficiency
The interfacial tension was calculated by the instrument Dataphysics Kruss K20

Summary

Introduction

With the advancement of petroleum development, tight oil, an unconventional oil resource, has become a research hot spot that has received increasing attention [1]. As one of the typical tight sandstones, tight lacustrine sandstones are widely developed in China [2, 3]. This type of reservoir has excellent potential, the limitations of current techniques for its extraction mean that a large amount of oil remains in the strata [4]. Spontaneous imbibition is a state-of-art and efficiency developing method that is widely used in oil fields in China [3, 5, 6]. To catalyze the comprehension of the mechanism of spontaneous imbibition and facilitate the fieldwork of the technique, the control mechanism and parameter simulation of oil-water properties on the spontaneous imbibition efficiency of tight sandstone reservoirs were analyzed

Methods

Results

Conclusion