Mechanism of ultrasonic strengthening fluidity of low mature shale oil: A case study of the first member of Lucaogou Formation, western Jimusaer Sag, Northwest China

作     者：Bo-Yang Wang Bo Liu Yun-Fei Cui Zi-Long Wang 

作者机构：Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient DevelopmentMinistry of EducationNortheast Petroleum UniversityDaqing163318HeilongjiangChina No.203 Exploration TeamJilin Bureau of Coalfield GeologySiping136000JilinChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第6期

页      面：3337-3347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] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：funded by National Natural Science Foundation of China(Grant No.U2244207,42002186) Superior Youngth Foundation of Heilongjiang Province(YQ2021D004) Postdoctoral Science Foundation of Heilongjiang Province(LBH-Z20117) Northeast Petroleum University Guiding Innovation Fund(2021YDL-02) 

主　　题：Ultrasonic Shale oil Reservoir properties Mobility Recovery 

摘      要：The low mature shale oil resources of Lucaogou Formation in Jimusar Sag have a great potential, but the heavy oil quality limits large-scale economic development significantly. Ultrasonic is a typical representative of heavy oil viscosity reduction and anhydrous fracturing technology, and how to understand the action characteristics and mechanism of ultrasonic effect on reservoir is a critical issue to enhance shale oil production in the industrialized application of power ultrasonic. Therefore, the comparative experiments with different time of power ultrasonic loading were conducted to analyze the response mechanism of reservoir characteristics and the change of fluid mobility. The results indicate that the ultrasonic treatment is ameliorative to the pore-fracture structure, and the improvement degree is controlled by the mechanical vibration and cavitation of ultrasound. Generally, the location with weak cementation strength or relatively developed microcrack is preferred to pore expansion. After the ultrasonic treatment, the shale oil quality becomes lighter, and the transformation of shale oil from adsorbed to free, is accelerated due to enhanced fluidity. Pore-expanding effect and fluid mobility enhancement are essential aspects of the power ultrasonic loading to improve the recovery of low mature shale oil. The results of this study support the feasibility analysis of ultrasonic enhanced shale oil exploitation theoretically.