Du Jianfen, Liu Qi, Guo Ping, Jiang Tongwen, Xiong Yuming, Jiang Xian
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
China National Petroleum Corporation Research Institute of Petrol Exploration and Production, Tarim Oilfield Company, Korla 841000, China.
ACS Omega. 2020 Mar 27;5(13):7456-7461. doi: 10.1021/acsomega.0c00139. eCollection 2020 Apr 7.
Water-gas relative permeability is an important parameter for the rational development of gas fields. Conventional measurement methods are carried out at normal temperature and pressure without considering the actual conditions of high temperature and high pressure. The water displacing gas process in fractured tight sandstone reservoirs, under formation condition (116 MPa and 160 °C), was simulated by the self-manufactured displacing apparatus. The results show that cores under formation condition have the larger residual gas saturation, the smaller two-phase coexisting area, the lower water/gas relative permeability, and the lower displacement efficiency than that under normal conditions. The relative permeability declines slowly and the residual gas saturation is high, making the process of replacing the gas more difficult. The number and the interconnection quality of fractures affect the shape and the position of the displacing curves. It provides a reference for the rational development and further research of fractured tight sandstone reservoir.
水气相对渗透率是气田合理开发的一个重要参数。传统测量方法是在常温常压下进行的，未考虑高温高压的实际情况。利用自制驱替装置模拟了裂缝性致密砂岩储层在地层条件（116兆帕和160℃）下的水驱气过程。结果表明，与正常条件下相比，在地层条件下岩心具有更大的残余气饱和度、更小的两相共存区、更低的水/气相对渗透率和更低的驱替效率。相对渗透率下降缓慢且残余气饱和度高，使得驱替气体的过程更加困难。裂缝的数量和连通质量影响驱替曲线的形状和位置。它为裂缝性致密砂岩储层的合理开发和进一步研究提供了参考。
