Experimental Investigation on the Countercurrent Imbibition Distance and Factors Influencing the Imbibition Recovery of Carbonated Fracturing Fluid

作者：Xiaobing Han, Haiyang Yu, Y. N. Wu, Peng Song, Tongbing Wang, Rui Ma, Jun Lu, Yang Wang · 发表于：SPE Journal · 年份：2025 · DOI：10.2118/218205-pa · 被引用次数：42 · 研究领域：Hydraulic Fracturing and Reservoir Analysis、Hydrocarbon exploration and reservoir analysis、Enhanced Oil Recovery Techniques

Summary The integration of fracturing, energy enhancement, and imbibition (IFEI) has proven successful in shale oil development, with one of the keys to enhancing development efficiency lying in improving imbibition effectiveness during the well shut-in phase. Carbonated water (CW) imbibition effectively combines the advantages of CO2 and water for enhanced oil recovery. Nevertheless, research on its performance in shale oil reservoirs remains scarce, and its application in fracturing has not been investigated. This study, for the first time, proposes using CW as a dispersion medium in the formulation of carbonated fracturing fluid to enhance IFEI development in shale oil. Computed tomography (CT) online scanning experiments were specifically designed to investigate the countercurrent imbibition distance (CID) and recovery (CIR) across various fluids, including formation water, nanovariable viscosity slickwater (NVS) fracturing fluids, and the newly formulated carbonated fracturing fluid. Additionally, separate imbibition experiments were carried out to assess the overall imbibition recovery of these fluids, focusing on exploring various factors influencing the imbibition of carbonated fracturing fluid. CT scans reveal that carbonated fracturing fluid significantly enhances imbibition performance, achieving a CID of 1.75 cm and a CIR of 6.95%. Compared with formation water and NVS fracturing fluids, it exhibits increases in CID by 0.75 and 0.25 cm, and improvements in CIR by ...