| 摘要: |
| 根据边界层理论,运用三次函数形式对特低渗岩心试验曲线进行拟合分析，在此基础上,运用微分线性描述方 法,建立考虑边界层及启动压力梯度影响的特低渗储层渗流阻力梯度的数学模型,得到渗流阻力梯度与驱替压力梯 度及渗透率的关系图版。结果表明，渗流阻力梯度随驱替压力梯度增加而降低,随渗透率减小而增大,且渗透率越 小，渗流阻力梯度增幅越大,其非线性变化特征越明显。 |
| 关键词: 特低渗油藏 渗流阻力梯度 非线性特征 边界层 启动压力梯度 |
| DOI： |
| 分类号: |
| 基金项目:国家“973”重点基础研究规划项目(2003CB214602) |
|
| Nonlinear feature of flow resistance gradient in ultra-low permeability reservoir |
|
LIU Hui1,FENG Ming-sheng1,HE Shun-li2,YANG Shuang1,YANG Ming-hui3
|
|
(1.Research Institute of Petroleum Exploration & Development, PetroCkina, Beijing 100083, China ;2. MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China ;3. Basin & Reservoir Research Center in China University of Petroleum, Beijing 102249, China)
|
| Abstract: |
| According to the boundary layer theory, the experimental curves of ultr-low permeability cores were analyzed by applying cubic function. Considering the influence of the boundary layer and starting pressure gradient，a mathematical model of flow resistance gradient of ultra-low permeability reservoir was established by differential and linear description method. And the relationship charts between flow resistance gradient and driving pressure gradient, permeability were obtained. The results show that the flow resistance gradient decreases with the driving pressure gradient increasing. The flow resistance gradient increases with the permeability decreasing, and the increasing amplitude of flow resistance gradient enhances and its nonlinear feature is more obvious with the permeability decreasing. |
| Key words: ultra-low permeability reservoir flow resistance gradient nonlinear feature boundary layer starting pressure gradient |
