CO_2泡沫压裂液粘弹性与触变性的表征研究  

CHARACTERIZATION OF VISCO-ELASTICITY AND THIXOTROPY FOR CO_2 FOAM FRACTUR- ING FLUIDS

作　　者：卢拥军[1] 方波[2] 江体乾[2] 房鼎业[2] 舒玉华[1] 张汝生[1] 

机构地区：[1]中国石油勘探开发研究院廊坊分院 [2]华东理工大学化工学院

出　　处：《天然气工业》2005年第7期78-80,共3页Natural Gas Industry

基　　金：本文为国家"十五"科技攻关课题"低渗透油田增产改造关键技术研究"(2003BA613A-07)内容

摘　　要：文章针对低效油气藏存在低压、水敏等问题,开发了CO2泡沫压裂液技术。该压裂液以气液两相组成,外相为液态交联瓜尔胶,内相为气态二氧化碳。实验仪器为控制应力流变仪,分析了CO2泡沫压裂液的流变学特性,包括泡沫流体的粘弹性和触变性,并采用粘弹-触变性本构方程描述典型的泡沫压裂液流体的触变环,采用广义Maxwell粘弹性本构方程描述泡沫压裂液流体的粘弹性。泡沫压裂液同时具有剪切变稀、粘弹性和触变性, 采用5个参数粘弹触变性本构方程可描述典型的泡沫压裂液流体的触变环,用广义Maxwell粘弹性本构方程可描述泡沫压裂液流体的粘弹性,模型计算值与实验值吻合良好,本构方程具有良好的适应性。Aiming at the problems of low pressure and water sensitivity of low effective reservoirs, CO2 foamfracturing fluid is developed. The fracturing fluid consists of both gas and liquid phases. The outer phase is cross-linked guar gum of liquid state and the inner phase is carbon dioxide of gas state. With stress-controlling rheometer, the rheological characteristics of CO2 foam fracturing fluid are analyzed, including visco-elasticity and thixotropy of the foam fluid. Also, the constructive equation of visco-elasticity and thixotropy is used to describe the hysteresis loops. The constructive equation of the general Maxwell visco-elasticity is used to describe the visco-elasticity of the foam-fracturing fluid. The foam-fracturing fluid possesses thinning property by shear, visco-elasticity and thixotropy. The constructive equation of visco-elasticity and thixotropy with 5 parameters can be used to describe the hysteresis loops of typical foamfracturing fluids. The constructive equation of the general Maxwell visco-elasticity can be used to describe the visco-elasticity of the foam-fracturing fluid. The data calculated by the model couple with the data from experiments very well. The constructive equations have good suitability.

关 键 词：CO2泡沫压裂液 粘弹性 触变性 Maxwell 本构方程 表征 流变学特性 二氧化碳 控制应力 实验仪器 泡沫流体 剪切变稀 油气藏 相组成 瓜尔胶 流变仪 实验值 计算值 适应性 广义 水敏 

分 类 号：TE377[石油与天然气工程—油气田开发工程]