【摘要】 在分析周期注采机理的基础上,为进一步激活剩余油,建立注水井全井同步周期注水、注水井井间交替注水、注水井与采油井同时井间交替注采3种周期注采方案。采用数值模拟方法对这3种方案进行了优选,以确定适合周期注采开发的油藏地质条件、实施周期注采的最优半周期。在模拟过程中,考虑了周期注采时机、地层渗透率、厚度对开发效果的影响。研究结果表明,注水井与采油井同时井间交替注采方案为最优方案;周期注采方案适合在含水率大于60%、渗透率大于400×10-3μm2、厚度大于2m的油层中实施。在此基础上,根据地层压力、含水和注采半周期对采收率的影响进行研究,给出周期注采最优半周期与地层压力、含水级别的关系。研究结果对中高含水期周期注采方案的制定和和实施具有一定指导意义。更多还原

【Abstract】 Cyclic injection-production mechanism is analyzed for further activation of remaining oil. Three cyclic injection-production programs are established, including entire well cyclic injection, interwell alternative injection, and alternative injection-production between injectors and producers. The 3 programs are optimized by numerical simulation to identify suitable geological conditions and optimal half cycle for performing cyclic injection-production. The impacts of cyclic injection-production time, formation permeability and thickness on development response are considered during simulation process. The result shows that alternative injection-production between injectors and producers is the optimal program; cyclic injection-production is suitable for reservoirs with water cut over 60%, permeability over 400 × 10-3μm2 and thickness over 2 m. The influences of formation pressure, water cut and half cycle on recovery factor are studied, and the relationship between the optimal half cycle and the level of formation pressure and water cut is understood. This study is of reference significance to preparation and implementation of cyclic injection-production program in medium-high water cut stage.更多还原