Open Journal of Yangtze Oil and Gas
Vol.01 No.01(2016), Article ID:65666,1 pages

Research on Molecular Diffusion Coefficient of Gas-Oil System

Anping Ye1, Xiaoying Shen2, Ping Guo1, Shaoping Wang3, Zhongzhao Cheng4

1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China

2State Intellectual Property Office, Beijing, China

3No.2 Oil Production Plant, Petro China Changqing Oilfield Company, Qingyang, China

4Xi’an Changqing Technology & Engineering Company Ltd., Xi’an, China

Published on Hans Journal of Chemical Engineering and Technology, Vol. 3, No. 2, 2013; available on


During the process of gas injection flooding, when the gas comes into contact with oil, the mass- transfer phenomenon occurs. This changes the properties of the crude oil, improves the flow capacity, and thus enhances the oil recovery. Molecular diffusion coefficient is an important parameter to describe the mass-transfer rate of gas-oil system. At present, molecular diffusion coefficient is usually tested via indirect methods. There are 2 key points that should be noticed when testing this parameter. Firstly, select proper experimental methods. Secondly, use accurate model to describe the experimental data. In this research, the authors describe the researches on the experiment methods for determining diffusion coefficient for gas-oil system, the experiments and models on pressure decay, and the influencing factors that determine diffusion coefficient.


Oil, Mass Transfer, Molecule Diffusion Coefficient