双子型VES清洁泡沫压裂液稳泡性能  

Foam stability of Gemini-VES clean foam fracturing fluid

作　　者：吕其超 李兆敏[1] 李宾飞[1] 李松岩[1] 卢拥军[2] 邱晓慧[2] 张昀 

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]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《中南大学学报（自然科学版）》2016年第9期3101-3107,共7页Journal of Central South University:Science and Technology

基　　金：国家高技术研究发展计划(863计划)项目(2013AA064803);国家科技重大专项项目(2011ZX05051003);中国石油大学(华东)自主创新科研计划项目(15CX06023A);中国石油大学(华东)研究生创新工程资助项目(YCX2015014)~~

摘　　要：针对双子型黏弹性表面活性剂（VES）泡沫压裂液不同于常规泡沫压裂液的稳泡机理,采用微观气体扩散测定、低温冷冻电镜透射、界面流变测试、微观可视化等研究手段,对排液速度、液膜强度、气体扩散速度等进行测试分析。研究结果表明：VES泡沫压裂液的液相中形成互相缠绕的蠕虫状胶束,减缓液膜排液速度,促使泡沫析液半衰期相对单一表面活性剂泡沫延长2~3个数量级;VES泡沫气液界面上吸附达到饱和状态的表面活性剂分子以及体相中互相缠绕的蠕虫状胶束抑制了气体扩散作用;VES泡沫液膜具有较高的界面扩张黏弹模量,这有助于增强气泡抵抗变形及自我修复的能力,进而提高泡沫适应压力波动的能力。这些特性使双子型VES清洁泡沫压裂液具有比常规泡沫压裂液更良好稳泡性能。To study the foam stability mechanism of Gemini-VES （viscoelastic surfactant） foam fracturing fluid that is different from the conventional foam fracturing fluid. Micro gas diffusion measuring device, cryo-transmission electron microscope, interfacial rheological test, microscopic visualization were used to measure and analyze the drainage speed of liquid through film between bubbles, mechanical strength of foam film and the rate of N： gas diffusion through foam film. The results show that there are entangled worm-like micelles in VES foam fracturing fluid which can slow the rate of liquid drainage and extend the foam drainage half-life 2-3 orders of magnitude. Surfactant molecules which have reached saturated adsorption quantity in the interface and entangled worm-like micelles in body phase block gas diffusion channel together. In addition, high viscoelastic modulus of VES foam film enhances self-repair ability and deformation resistance of bubbles, thus, enhances the adaptability of foam to the pressure fluctuation. With these characters Gemini-VES clean foam fracturing fluid has better foam stability than conventional foam fracturing fluid.

关 键 词：双子型VES 泡沫 压裂液 稳泡性 

分 类 号：TE357[石油与天然气工程—油气田开发工程]