Diffusion coefficients of natural gas in foamy oil systems under high pressures

作     者：Yan-Yu Zhang Xiao-Fei Sun Xue-Wei Duan Xing-Min Li 

作者机构：College of Petroleum EngineeringChina University of Petroleum School of GeosciencesChina University of Petroleum The Department of Chemical and Petroleum EngineeringUniversity of Calgary Research Institute of Petroleum Exploration and DevelopmentPetroChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2015年第12卷第2期

页      面：293-303页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：financial support from the Major Subject of National Science and Technology (2011ZX05032-001) the Fundamental Research Funds for the Central Universities(NO.11CX06022A) 

主　　题：Foamy oil Diffusion coefficient - Heavy oil Gas injection High pressure 

摘      要：The diffusion coefficient of natural gas in foamy oil is one of the key parameters to evaluate the feasibility of gas injection for enhanced oil recovery in foamy oil reservoirs. In this paper, a PVT cell was used to measure diffusion coefficients of natural gas in Venezuela foamy oil at high pressures, and a new method for deter- mining the diffusion coefficient in the foamy oil was de- veloped on the basis of experimental data. The effects of pressure and the types of the liquid phase on the diffusion coefficient of the natural gas were discussed. The results indicate that the diffusion coefficients of natural gas in foamy oil, saturated oil, and dead oil increase linearly with increasing pressure. The diffusion coefficient of natural gas in the foamy oil at 20 MPa was 2.93 times larger than that at 8.65 MPa. The diffusion coefficient of the natural gas in dead oil was 3.02 and 4.02 times than that of the natural gas in saturated oil and foamy oil when the pressure was 20 MPa. However, the gas content of foamy oil was 16.9 times higher than that of dead oil when the dissolution time and pressure were 20 MPa and 35.22 h, respectively.