不稳定注水适应性分析

Applicability Analyse about Unstable Waterflooding

不稳定注水是提高水驱开发效果的一种有效手段,原有成果主要从油藏特性、注水制度等方面研究。随着水驱程度日益深入、地下注采状况更为复杂,有必要全面研究不稳定注水增效机理。根据现场实践,结合水驱后期剩余油分布特征,提出了主要从井网、注采关联出发的不稳定注水适应性分析。研究认为,应优先选择注采关联相对独立的井组、选择位于油层边部及井网相对不完善区井组、选择层间差异较大的井组实施不稳定注水。实践证明,考虑井网后的不稳定注水,现场实施效果更好。

Unstable waterflooding is a kind of efficient way to improve waterflooding efficiency. The known studies are mainly about reservoir characteristics and water injection system. Basing on field practice and remaining oil distribution, this paper studiesthe unstable waterflooding applicability from the well pattern and injection-production relation. As a result, the preferential well units should be chosen to apply unstable waterflooding which have the characteristics of self-existent injection-production,layer edge,unperfect well pattern,and difference among layers. Field applications proved that it is very successful.