In order to measure the diffusion coefficient of hydrocarbon gases in rocks more accurately and provide parameters for the evaluation of the loss and preservation of natural gas accumulations, the authors developed an experiment apparatus to simulate the diffusivity of natural gas in depth.The hardware structure, technical parameters of the apparatus and the experimental flow for simulating the deep natural gas diffusion coefficient were described. Taking the shale of Cambrian Niutitang formation and the dense limestone of Permian Maokou formation as examples, the authors simulated the natural gas diffusion in rocks under high temperature and high pressure, and calculated their diffusion coefficients. The results show that the test data of the deep natural gas diffusion coefficient are reliable by using the apparatus, which provides a technical means for the evaluation of deep gas preservation conditions.
卢丽, 王国建, 朱怀平, 王光华, 蒋涛. 深层天然气扩散系数模拟实验装置的研制[J]. 物探与化探, 2020, 44(6): 1441-1445.
LU Li, WANG Guo-Jian, ZHU Huai-Ping, WANG Guang-Hua, JIANG Tao. The development of an experimental measuring apparatus for simulating the diffusion coefficient of naturalgas in depth. Geophysical and Geochemical Exploration, 2020, 44(6): 1441-1445.
Liu G D, Zhao Z Y, Sun M L, et al. New insights into natural gas diffusion coefficient in rocks[J]. Petroleum Exploration and Development, 2012,39(5) : 559-565.
Lou H, Luo P, Xue P, et al. The quantitative study on factors influencing diffusion coefficients of natural gas[J]. Inner Mongolia Petrochemical Industry, 2012,14:5-6.
Zhang L, Guo J Y, Xie Z Y, et al. Technical details of determination of hydrocarbon gas diffusion coefficient in rock[J]. Petroleum and Chemical Equipment, 2019,22(5):28-31.
Wang X B, Chen J F, Li J, et al. Rock diffusion coefficient measuring and its effecting factors of tightgas reservoir under high temperature and high pressure[J]. Journal of China University of Petroleum, 2014,38(3):25-31.
Zhang Y F, Yu J C, Li P, et al. Determination of the diffusion coefficient of natural gas in rocks under saturated water[J]. Journal of Daqing Petroleum Institute, 2001,25(4):4-7.
Shao Y M, Qu B, Liu Y, et al. Development of rock diffusion coefficient detecting device under temperature and pressure[J]. Petroleum Instruments, 2004,18(5):16-18.
Hao S S, Huang Z L, Gao Y B. Study on diffusion coefficient of light hydrocarbon and dynamic equilibrium principle of natural gas migration and accumulation[J]. Acta Petrolei Sinica, 1991,12(3):17-24.
Yang J, Kang Y L, Sang Y. Research on diffusibltiy of the gas in tight sand gas reservoir[J]. Journal of Southwest Petroleum University:Science & Technology Edition, 2009,31(6):76-79.