摘要
泡沫压裂由于具有地层伤害小、返排迅速、滤失低、黏度高、摩阻低以及携砂能力强等优点,因而在低压、低渗、水敏等特殊储层的改造中得到了广泛的应用。泡沫压裂液在井筒中的流动与常规压裂液相比,主要体现出两方面的不同:一是由于泡沫压裂液中气相的存在,使得泡沫压裂液是可压缩流体,其密度是井深的函数,摩擦系数也随之发生变化;二是泡沫压裂液在井筒中既可以单相流的形式也可以多相流的形式流动,因而常规压裂液的摩阻计算方法不再适合于泡沫压裂液的摩阻计算。为此,建立了泡沫压裂井筒摩擦压降计算模型,在计算模型中,根据"体积恒等"原理,改进了摩擦系数的求解方法。并选用某口泡沫压裂施工井进行了实例计算。
Foam fracturing has been widely used in the recovery of peculiar reservoirs with low pressure, low permeability, and water sensitivity, because of its obviously good results such as less damage on the formations, quick flowback, little filtration, high viscosity, small friction resistance, and high proppant carrying capacity, etc. Compared with regular fracturing fluids, foam fracturing fluids show differences in two ways: first, the fracture fluid is compressible, its density is well depth's function and its friction coefficient is changed accordingly due to the existence of gas phase in foam fracture; second, since foam fracture fluid can flow not only in single phase but in multiphase in borehole, the calculating method on friction of traditional fracture fluid is not suitable to foam fracture fluid any more. As a result, the calculating model on friction loss during foam fracture was established. In this model, the resolution method of friction coefficient was modified in accordance with the theory of 'volume identity' and also was illustrated by a case of study in a certain selected well with foam fracturing.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2007年第12期93-95,共3页
Natural Gas Industry
基金
国家自然科学基金资助项目(编号:90210022)的资助
关键词
完井
压裂
泡沫酸酸化
摩擦损失
计算
模型
completion, fracturing, foam fracturing, friction loss, computation, model
