深层稠油油藏天然气气水交替注入参数优化

Injection parameter optimization of natural gas alternating water in deep heavy oil reservoir

针对鲁中区M稠油油藏的地质与开发特征,结合相态拟合后的状态方程,建立先导试验区油藏数值模拟模型。利用历史拟合调整后的油藏数值模拟模型,采用正交试验设计方法,考虑天然气气水交替的注气量、首段塞尺寸、后续段塞尺寸、气水段塞比、注气时机和注气速度6个参数,以采收率为评价指标,对各注入参数进行正交试验研究。通过对试验结果的直观分析和方差分析,定量评价各注入参数对稠油油藏采收率的影响程度,得到各注入参数优先次序,并获得天然气气水交替各注入参数的最优组合,为现场天然气气水交替注入参数的确定提供指导和依据。

Based on the geology and development characteristics of M heavy oil reservoir in Luzhong area,combined with fitting equation of phase state,the numerical simulation model for pilot test reservoir was set up. The orthogonal tests were carried out to evaluate recovery factors of six injection parameters including total gas slug size,first gas slug size,successive gas slug size,gas water slug ratio,gas injection timing and injection rate. According to visual and variance analysis of test results,it was evaluated the quantitative influence of injection parameters on the recovery factor of heavy oil reservoir. And then the priority order and the optimal combination of injection parameters were obtained. It provides guidance and basis for the determination of natural gas alternating water injection parameters in heavy oil field.