摘要
聚/表二元复合驱驱替液中加入了比较高浓度的聚合物,相比于水驱,二元复合驱驱替液的黏度较高。因而二元复合驱驱替液在地层渗流时,必须考虑启动压力梯度的影响。通过研究大港油田的二元复合驱配方在不同渗透率的岩心中渗流规律,研究二元复合驱驱替液的启动压力梯度的变化规律。研究结果表明,二元复合驱驱替液渗流在低速段表现为非线性流,随着压力梯度增加,转变为线性流。二元复合驱驱替液在岩心中的渗流存在明显的启动压力梯度。二元复合驱驱替液的启动压力梯度与岩心的渗透率和自身的黏度有关。驱替液黏度越高,岩心渗透率越低,其启动压力梯度越大。
Because plenty of polymer are added in the surface/polymer flooding＇ solution,surface/polymer flooding＇ solution has a higher permeability than water flooding.So when surface/polymer flooding＇ solution flow in the stratum,its threshold pressure gradient is an important influence factor.According to study surface/polymer flooding＇ solution made as Dagang oilfield＇s formula flow in some cores with different permeability,get the variation law of surface/polymer flooding＇ solution＇s threshold pressure gradient.The result of the study shows seepage flow of surface/polymer flooding＇ solution is nonlinear porous flow when its speed is low.As the pressure gradient grows it will turn to be Darcy＇s linear flow.So surface/polymer flooding has the obvious threshold pressure gradient.The threshold pressure gradient of surface/polymer flooding has a relationship to viscosity of the solution and permeability of cores.The viscosity of the solution is bigger,and permeability of cores is lower,threshold pressure gradient of surface/polymer flooding is higher.
出处
《科学技术与工程》
北大核心
2013年第34期10292-10294,10336,共4页
Science Technology and Engineering
关键词
聚
表二元复合驱
非线性流
启动压力梯度
黏度
渗透率
surface/polymer flooding
nonlinear porous flow
threshold pressure gradient
viscosity permeability
