引用本文:
【打印本页】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览次   下载 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Matching relationship between microfoam diameter and formation pore diameter
SHI Shenglong1, WANG Yefei2, WEN Qingzhi3,4, ZHAO Ji5, LI Yang5, KUANG Xiyu5
(1.Qingdao Dadi Institute of New Energy Technologies, Qingdao 266041, China;2.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;3.College of Engineering in Peking University, Beijing 100871, China;4.Engineering Science and Innovative Technology Development Center in Peking University, Beijing 100871, China;5.Research Institute of Exploration and Development, Tarim Oilfield Branch Company, PetroChina, Korla 841000, China)
Abstract:
In order to further understand the matching relationship between microfoam diameter and formation pore diameter, one microfoam with bubble diameter distribution from 10 to 100 μm was fabricated by gas/fluid flow through sandpack, through which the effect of gas liquid ratio and sandpack permeability on microfoam diameter were investigated, and the plugging mechanism of microfoam were revealed by micromodel tests. The displacement experiments were conducted using artificial core with multiple pressure points to simulate porous media, and the matching relationship between microfoam diameter and formation pore diameter was studied when microfoam plugged formation was established. The results show that average bubble diameter of microfoam could be controlled from 12.39 to 99.31 μm by changing gas liquid ratio and sandpack permeability. When the ratio of microfoam average bubble diameter to core average pore diameter is 1.45-2.16, microfoam shows both good better injectivity and deep plugging capacity, which considers the microfoam diameter matches with core pore diameter at the moment. The microfoam could be matched with permeability from 0.02 to 10.9 μm2 by adjusting the average bubble diameter of microfoam. The microfoam would create a temporary blocking zone in high permeable region through bubble accumulation, and the subsequent microfoam would flow through the low permeable region directly or by means of elastic deformation. A small amount of finely textured microfoam with smaller bubbles could occupy pore to form plugging. As the increase of gas liquid ratio, the bubble quantity of microfoam increases, and the blocking mode of microfoam at pore changes from intermittent plugging to continuous plugging, which leads to the enhancement of plugging capacity and deformability of microfoam. The strongest plugging capacity is reached when the gas liquid ratio is 1.
Key words:  microfoam  average bubble diameter  diameter ratio  matching  plugging mechanism