稠油注蒸汽热采过程中的水化学问题

AN AQUEOUS CHEMISTRY PROBLEM IN HEAT EXTRACTION PROCESS OF DENSE OIL BY MEANS OF STEAM INJECTION

本文简要论述了稠油注蒸汽采过程中所引发出的水化学问题,指出:在注蒸汽热采过程中,随着蒸汽的注入,将在储层内自注热井向四周逐渐形成一些连续过渡的温、压、pH值和水相状态不同的汽水浸润带,即蒸汽饱和带→蒸汽过热水混合带→过热水带→与储层温压条件相当的热水带,由于各带内状态条件的不同,故各带内所引发出的水-岩作用(包括矿物的溶解与沉淀作用)将是有所不同的,因而对各带内储层孔隙结构的影响程度也将是不同的。文中还扼要地介绍了对此进行水化学研究的方法原理和研究途径。

This paper discusses an aqueous chemistry problem formed in the heat extraction process of dense oil by means of steam injection, and points out that in the heat extraction process , along with injection of steam into oil reservoir, the injected steam is going to form a continuous transition sterm-watet soak zone, a steam saturation zone→condensation steam zone→hot water zone→lukewarm water zone, in which temperature and pressure are commensurated within the oil reservoir. As a result of different state conditions in various zones, the water-rock action in each zone is different . For this reason, its effects on porosity texture of oil reservoir in various zones will also be different. This paper introduced briefly the principles and ways of aqueous chemistry research method.