摘要
介绍了常用的硫酸盐、碳酸盐结垢预测方法,包括静态测定法、简易化学计算法及计算机预测法。使用预测软件OFISTP3.0预测,中原油田文72块3口注水井地面注水系统、井筒、近井地带结垢量依次增大,与现场情况基本一致。用静态法在45℃和95℃测定文72块注入水中Ca2+浓度随时间的变化,表明CaCO3垢生成量随温度升高而增多。在储层岩心中依次注入现场注入水、不含结垢离子的模拟水,分别加入5、2、0.5、0.2 mg/L防垢剂SA1320C的注入水,得到的渗透率保留率与注入水量关系曲线反映了CaCO3垢在岩心中的沉积和注入防垢剂的防垢效果,该防垢剂在加量0.5 mg/L时即具有良好的防垢作用。
The predicting methods and techniques for sulfate and carbonate scaling developed up to the present are summarized and ts under static conditions, abbreviated stoichiometric calculations, and computerized means. It is shown by using predicting software OFISTP3.0 that the scale creation in the surface injecting system, the well bore, and the near bore zone of three water injection wells at Wen-72 block increases in the order above given and this result is basically in accordance with field observations. The changes in ca^2＋ concentration in the injection water for flozxting Wen-72 reservoir determined by a static method at 45℃ and 95℃ show that the CaCO3 scale creation is increased with increasing temperature. In reservoir core flow extxeriments, the injection water, a non-scaling simulation water, and the injection water with scale inhibitor （SI） SA1320C added at dosage 5,2,0.5, and 0.2 mg/L, respectively, are injected successively and the core permeability retention vz injected water volume curve demonstrates the formation of CaCO3 scale in the core and the function of the SI with minimum SI dosage being of 0.5 mg/L.
出处
《油田化学》
CAS
CSCD
北大核心
2008年第3期221-223,231,共4页
Oilfield Chemistry
关键词
注入水
结垢性
碳酸钙垢
结垢趋势预测
结垢量
静态测定法
岩心流动实验法
中原油田文72块
injection water
scale formation
calcium carbonate scale
scaling tendency prediction
scale creation determination
core flow experiments
block Wen-72 reservoir in Zhongyuan
