中南大学学报（自然科学版）2013，Vol.44Issue(2)：695-700,6.
特低渗透天然砂岩大型物理模型渗流规律
Percolation law of large-scale natural sandstone physical model with ultra-low permeability
摘要
Abstract
A large-scale natural sandstone physical model of ultra-low permeability was established, and a new method for studying seepage law of ultra-low permeability was proposed. Seepage curves measured from the large-scale model were analyzed using the concept of dimensionless productive factor and the seepage characteristic was summarized. Combining the non-linear seepage curve of small sample core with the pressure gradient field of the large-scale model, seepage area of the model was divided into dead oil area, non-linear seepage area and quasi-linear seepage area. The results show that the non-linear seepage law still exists in large-scale model, which is the same as small cores. Under the same pressure, the dimensionless productive factor decreases with the decrease of permeability, and the nonlinear seepage characteristic is remarkable. DPF increases up to a constant value with the increase of pressure. The scope of seepage area is related to drawdown pressure, well spacing and the physical characteristics. Large drawdown pressure and small well space reduced the dead oil area, even to disappear, which enhanced the flow ability of fluid in reservoir. This new method can describe seepage characteristic of actual reservoir more intuitively.关键词
特低渗透/大型物理模型/压力梯度场/天然砂岩/渗流规律Key words
ultra-low permeability reservoir/ large-scale physical model/ pressure gradient field/ natural sandstone/ seepage law分类
能源科技引用本文复制引用
崔茂蕾,丁云宏,薛成国,徐轩,刘学伟,杨正明..特低渗透天然砂岩大型物理模型渗流规律[J].中南大学学报（自然科学版）,2013,44(2):695-700,6.基金项目
国家油气重大专项(2011ZX05013-005) （2011ZX05013-005）
