黄原胶稳定的微泡沫稳定性及在非均质地层中的调剖效果  

Stability and Profile Control Capacity of Xanthan Gum-stabilized Microfoam in Heterogeneous Porous Media

作　　者：史胜龙[1] 王业飞[1] 周代余[2] 赵冀[2] 李忠鹏[1] 丁名臣[1] 杜鹏飞[3] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [3]中国石油辽河油田分公司冷家油田开发公司,辽宁盘锦124010

出　　处：《油田化学》2016年第4期658-663,共6页Oilfield Chemistry

基　　金：长江学者和创新团队发展计划项目“复杂油藏开发和提高采收率的理论与技术”(项目编号IRT1294);中央高校基本科研业务费专项资金资助“微泡沫体系的构筑及性能评价”(项目编号15CX06030A);中国石油天然气股份有限公司重大专项“塔里木油田勘探开发关键技术”(项目编号2014E-2107)

摘　　要：针对普通泡沫稳定性弱、在强非均质地层调剖效果差的问题,将氮气和起泡剂溶液(黄原胶/甜菜碱表面活性剂)同时注入玻璃珠填制的填砂管制备出一种直径细微、稳定性强的微泡沫体系。通过气泡形态、平均气泡直径、气泡密度等参数对比了普通微泡沫(甜菜碱表面活性剂)与黄原胶稳定的微泡沫稳定性差异,并借助微观模型和并联填砂管模型对比了两种微泡沫的调剖能力。研究结果表明:随黄原胶浓度增加,微泡沫液膜的厚度和黏弹性提高,微泡沫平均气泡直径降低,气泡密度增加,微泡沫平均气泡直径和气泡密度的变化速率降低,微泡沫稳定性好于普通微泡沫。微泡沫在微观模型低渗区域的波及体积高达90%,远高于普通微泡沫。微泡沫对于级差为10的严重非均质地层具有较好的调剖效果,调剖效果的改善与起泡剂溶液中黄原胶浓度的增加有较好的对应性。Aiming at the problems of poor stability and worse profile control effect of regular foam in strong heterogeneous formation, a microfoam with tiny diameter and high stability was prepared by a sandpack filled with glass beads with co-flowing nitrogen and foaming solution （xanthan gum and betaine surfactant）. The difference of stability between xanthan gum-stabilized microfoam and common microfoam was compared by parameters such as bubble shape, the average bubble diameter and bubble density, and the effectiveness in improving profile control capacity of two kinds of microfoam at micromodel and pore media was evaluated by micromodel tests and double-core experiments. The results showed that with increasing xanthan gum concentration, the thickness and viscoelasticity of liquid film of microfoam were increased, the average bubble diameter of microfoam decreased and bubble density increased, the variation rate of microfoam average bubble diameter and bubble density decreased which contributed to improve the stability. The swept volume of xanthan gum-stabilized microfoam in low permeability zone reached up to 90%, far higher than that of common microfoam. The result of double-core experiment showed that the microtbam had excellent profile control capacity in strong heterogeneous formation when the permeability grade reached to 10. The increase in profile control effects had a good correspondence with the increase of xanthan gum concentration in foaming solution.

关 键 词：微泡沫 黄原胶 稳定性 调剖效果 非均质微观模型 

分 类 号：TE357[石油与天然气工程—油气田开发工程] O648.24[理学—物理化学]