前置液又称垫液或预冲洗液。向产层注入某种工作液（如压裂液、酸化液、堵水剂、防砂剂等）之前，注入井内的一种液体。
We adopt the method of prepad fluid and multi-slug with steam for high viscosity heavy oil,and the one of prepad fluid or multi-slug with steam for low viscosity heavy oil.
现场应用时对于原油粘度高的特超稠油,采取“前置液+多段塞伴蒸汽注入”的方式,而对于普通稠油单纯采取前置液注入或伴蒸汽注入的方式即可。
参考来源 - 石油磺酸盐提高稠油开采效果技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
最先注入的段塞通常是用来调节储层的水前置液。
The first slug injected is usually a water preflush, used to condition the reservoir.
采用了基岩酸化、前置液酸压裂、胶凝酸酸压裂和加砂压裂等工艺措施。
The technology measures of bed rock aciding, preflush and gelling acid fracturing, as well as sand fracturing etc. are used.
乳化酸酸化酸液由前置液、乳化酸、后置液、KFT反应液和顶替液组成。
Acidizing fluid of emulsified acid consists of preflush, emulsion, after-pad, KFT reaction fluid and displacement fluid.
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