压敏效应对致密多孔介质微观孔隙结构及流体流动的影响机制

项目名称： 压敏效应对致密多孔介质微观孔隙结构及流体流动的影响机制

项目编号： No.51304232

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 杨永飞

作者单位： 中国石油大学（华东）

项目金额： 25万元

中文摘要： 致密介质中油气藏的高效开发是我国油气增储上产的重要阵地之一，但是致密介质孔隙喉道小、渗透率低、流体在其中的渗流呈非线性，并且应力敏感性强。针对上述问题，课题拟基于数字岩心，采用微观流动模拟方法，阐明压敏效应对致密介质微观孔隙结构形变及油气渗流规律的影响机制。课题拟首先对岩样施加不同有效应力，进行CT扫描、扫描电镜(SEM)、X射线衍射等实验，然后构建数字岩心，定量表征压敏效应对微观孔隙结构的影响；在此基础上，基于数字岩心和格子-Boltzmann方法，模拟油水、气水两相流动，研究压敏效应引起的微观孔隙结构形变对渗流的影响；同时考虑应力应变和多相渗流，利用COMSOL多物理场数值模拟软件进行压敏效应对渗流的影响研究；最后进行室内岩心驱替实验和压汞实验，对比验证两种数值模拟结果。该课题的研究将揭示压敏效应对致密介质油气藏微观孔隙结构和多相渗流的影响机制，为高效开发致密介质油气藏提供支持。

中文关键词： 致密多孔介质；微观孔隙结构；压敏效应；X-CT成像；数字岩心

英文摘要： The efficient development of oil and gas reservoirs in tight porous media is one important way to increase China's oil and gas reserves and production. However, tight porous media has the following characteristics: small pore and throat, low permeability, stress sensitivity and the fluid flow in which is non-linear. In response to the above issues, the effect of pressure-sensitive effect on microscopic pore structure deformation and oil & gas flow in tight porous media will be studied based on digital core using pore-scale modelling method. Firstly, different effective stress will be impressed on rock samples, CT scan, scanning electron microscopy (SEM), X-ray diffraction experiments will be carried out, the corresponding digital core will be reconstructed and quantitative characterization of pressure-sensitive effects on microscopic pore structure; Secondly, two-phase flow simulation of oil/water, gas/water will be studied to investigate the pressure-sensitive effects on flow caused by microscopic pore structure deformation using the lattice-Boltzmann method; Another modelling method is that taking into account the stress-strain and multiphase flow, COMSOL multi-physics numerical simulation software will be used to study the pressure-sensitive effect on fluid flow in tight porous media. Lastly, indoor core floo

英文关键词： tight porous media；micro-pore structure；pressure-sensitive effect；X-CT scanned image；digital core