Influence of supercritical CO2 on the physical property of tight sandstone
作者机构：PetroChina Engn Technol Res Inst Southwest Oil & Gas Field Co Chengdu 610017 Peoples R China Southwest Oil & Gas Field Co Key Lab Oil & Gas Well Stimulat Technol Chengdu 610017 Peoples R China Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610500 Peoples R China Gubkin Russia State Univ Oil & Gas Moscow 119991 Russia
出 版 物：《PETROLEUM》 (油气（英文）)
年 卷 期：2024年第10卷第3期
页 面：520-526页
核心收录：
学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 0817[工学-化学工程与技术] 08[工学] 0818[工学-地质资源与地质工程]
基 金：Scientific Research and Technology Development Project of Southwest Oil and Gas Field Company petrochina [20210302-05]
主 题：Low pressure tight sandstone Porosity Permeability Microstructure Supercritical CO2 REAL-GAS MIXTURE SURFACE CHARACTERISTICS SHALE OIL FRACTURES WATER TRANSPORT SIMULATION INJECTION NANOPORES
摘 要：In low-pressure gas reservoirs, water-based fracture fluid is difficult to flowback, which is unfavorable for several tight sandstone gas reservoirs in the Sichuan Basin with low pressure and high permeability geological characteristics. Supercritical CO2 possesses a number of remarkable physical and chemical features, including a density near to water, a viscosity close to gas, and high diffusion. Supercritical CO2 fracturing is a new type of non-aqueous fracturing method that is favorable to fracturing flowback in low-pressure tight sandstone and has a wide range of applications. To discuss on whether supercritical CO2 fracturing with low pressure tight sandstone is feasible. Tight sandstone cores from the Jinqiu gas field in the Sichuan Basin were used to study the influence of supercritical CO2 on the physical properties of sandstone reservoirs. Supercritical CO2 was used to interact with tight sandstone samples, and then the changes in porosity, permeability, and rock microstructure of tight sandstone were observed under various time, pressure, and temperature conditions. After the interaction between tight sandstone and supercritical CO2, new dissolution pores will appear, or the original pores will be increased, and the width of some natural fractures will also be increased, and the porosity will increase by 1.09%-8.85%, and the permeability will increase by 2.34%-21.26%, quantifying the influence of supercritical CO2 on physical properties of tight sandstone, and further improving the interaction mechanism between supercritical CO2 and tight sandstone. This study improves in the understanding of the tight sandstone-supercritical CO2 interaction mechanism, as well as providing an experimental foundation and technological guarantee for field testing and use of supercritical CO2 in low-pressure tight sandstone gas reservoirs. (c) 2022 Southwest Petroleum University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open a
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