Experimental and Theoretical Investigation of Nonlinear Flow in Low Permeability Reservoir
作者单位：Lang fang Branch Petro China Exploration and Development Research Institute
会议名称：《2011 International Conference on Energy and Environment(ICEE 2011)》
会议日期：2011年
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]
关 键 词：low permeability reservoirs percolation nonlinear absorption boundary layer capillary model
摘 要：Taking low permeability cores of Daqing oilfield for example, the flow characteristics at low velocity were studied by using the self-designed micro-flux measuring instrument. Considering the throat distribution and capillary model, the thickness of fluid boundary layer under different pressure gradient was calculated, the mechanism and influencing factors of nonlinear percolation were discussed. The study showed that the percolation curve of ultra-low rocks was nonlinear, and apparent permeability was not a constant, which increased with pressure gradient. The absorption boundary layer decreased with the increase of pressure gradient, and changed significantly especially in low pressure gradient, which was the essence of bringing nonlinear percolation. The absorption boundary layer was also found to be impacted by surface property of rocks, and then impacted flow characteristics.