原子能科学技术Issue(8)：1521-1528,8.DOI:10.7538/yzk.2015.49.08.1521
低渗透含铀砂岩压力梯度-黏度-化学耦合渗流规律实验研究
Experimental Study on Pressure Gradient-Viscosity-Chemical Coupling Seepage Law of Low-permeability Sandstone Uranium Ore Rock
摘要
Abstract
To study the seepage law of low‐permeability sandstone uranium ore rock under the physical and chemical coupling action , and provide a reliable basis for the design of parameters for in‐situ leaching ,some samples of sandstone from a uranium mine in Xinjiang were used to carry out experimental research by a homemade permea‐bility test device . T he results indicate that there are three seepage stages in the low‐permeability rock ,namely ,the stage of starting pressure ,the stage of nonlinear seepage and the stage of linear seepage .With the change of fluid viscosity ,the percentage that fluid flow voids occupied in the w hole rock voids and the rock permeability on the w hole can be changed .In the early stage of physical and chemical coupling seepage ,after the media of ore and leaching agent reacting chemically ,the pore structure of medium ore is altered ,and some of the smaller radius of pore is larger and connected ,w hich makes the seepage of fluid larger in the unit area and per unit time ,thereby enabling the overall permeability of sandstone medium becomes larger .In the latter stage of physical and chemical coupling seepage ,due to the pressure and chemical coupling ,the pore struc‐ture further evolves .When the pressure gradient is more sensitive than chemical sensi‐tivity of reaction ,the permeability coefficient increases ,w hereas decreases .关键词
低渗透含铀砂岩/物理化学渗流/压力梯度-黏度-化学耦合/渗透系数Key words
low-permeability sandstone uranium ore rock/physico-chemical percola-tion/pressure gradient-viscosity-chemical coupling/permeability coefficient分类
数理科学引用本文复制引用
曾晟,杜雪明,孙冰,谭凯旋..低渗透含铀砂岩压力梯度-黏度-化学耦合渗流规律实验研究[J].原子能科学技术,2015,(8):1521-1528,8.基金项目
国家自然科学基金重大科技计划资助项目（91026015）；湖南省教育厅优秀青年项目资助（12B111）；南华大学＂十二五＂科技创新团队项目资助；南华大学研究生科研创新项目资助 （）
