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以安塞长6微裂缝性特低渗透油藏为例,基于物质平衡原理及定态水侵模型,建立考虑无效注水的注采比、总压降与产液量差之间的关系,利用实际开发资料拟合,计算出无效注水比例及有效注采比,分析影响低效注水循环的因素,评价注水利用情况,结果表明中高含水期后注水低效循环主要受裂缝、大孔道影响,王窑、坪桥区无效注水比例分别达到35.9%、71.6%,水驱效率低,建立的评价方法与实际状况较为符合,为油藏综合调整提供依据。
Taking the 6th microfractured ultra-low permeability reservoir in Ansai as an example, the relationship between injection-production ratio, total pressure drop and liquid yield difference considering invalid water injection was established based on material balance principle and steady-state water intrusion model. The actual development of data fitting, calculate the proportion of invalid water injection and effective injection-production ratio, analyze the factors that affect the inefficient water injection cycle, evaluation of waterflood utilization, the results show that low water cycle after water injection is mainly affected by cracks, the impact of large channels, the king The proportion of invalid injection in kilns and Pingqiao reaches 35.9% and 71.6% respectively, and the waterflooding efficiency is low. The evaluation methods established are in good agreement with the actual conditions and provide the basis for comprehensive reservoir adjustment.