自流注水开发可行性与技术政策界限研究

自流注水技术操作简单、经济有效,可以被作为常规注水的一种补充方式或替代方式。自流注水在我国尚处于起步阶段,没有形成成熟的方法和认识。利用油藏数值模拟方法,从自流注水时机、生产井距、油层渗透率、油层厚度、水源层能量五个方面开展了可行性对比研究,得到了自流注水开发的部分技术政策界限。开发因素方面:建议自流注水与衰竭开发同步实施,最迟不要晚于弹性开采稳产期结束;建议合理生产井距为(800~1200)m。地质因素方面:建议油层厚度较小,水层油层厚度比不小于1;建议油层渗透率为中高渗,有利于延长稳产期;有多套水层满足自流注水条件且不需要同时开发时,首先优选上部水层自流注水。

Study on Feasibility and Technical Policies of Dumpflooding Development

Dumpflooding technology was generally used as a supplement or alternative way of conventional water flooding because of simple, economic and effective. The technology is still in the initial stage in China, without mature methods and cognitions. Using the reservoir numerical simulation method, five aspects are studied, which are dumpflooding timing, production well spacing, reservoir permeability, reservoir thickness and water layer energy. Get some understandings on the main technical policies of dumpflooding development. Development factors: Suggest the dumpflooding timing begins from the early depletion development, not later than the end of production plateau of depletion development. Suggest reasonable production well spacing is 800 m ~ 1200 m. Geological factors: Suggest smaller reservoir thickness and the water reservoir volume ratio no less than 1. Suggest the reservoir permeability is middle-high medium to extend the production plateau. Suggest preferably select the upper water layer for dumpflooding, when there are multiple water layers meeting the dumpflooding conditions and not need to develop at the same time.