尕斯油田注入水和地层水混注对储层的影响

摘要

利用溶度积规则预测尕斯油田注入水和地层水混注时储层的结垢类型,在此基础上通过天然岩心流动实验,分析注入水和地层水混注时地层渗透率下降的影响。结果表明,混注水在储层中主要生成CaCO3垢,储层渗透率有明显下降,且当混注水以1∶1注入时储层的渗透率下降最大。%The reservoir scaling is the main damage type of oilfield waterflooding,which exerts serious influence on oilfield development and economic benefits.This paper uses soluble degree accumulating rules to forecast the scaling type of reservoir when injected water and oil reservoir water mix note happen in Gasi oilfield.Based on this,through natural core flow experiment,the permeability declining influence on the reservoir is analyzed when the injected water and formation water mix note is carried out.Results show that mix water injection in reservoirs in major scale generating CaCO3 reservoir will obviously lower the permeability which will reach to its peak when mix water is injected with the proportion of 1∶1.