【摘要】 目的找出影响鄂尔多斯盆地低渗透油藏水氮气交注非混相驱提高采收率技术的影响因素,为优化现场实施方案提供依据。方法在室内模拟油藏条件,通过物理模拟实验和理论研究分析注入方式、气水比和段塞数对低渗透油藏水氮气交注非混相驱的影响程度。结果先气驱再进行水氮气交注非混相驱的最终驱油效率要比先水驱再进行水氮气交注非混相驱高10.24%;在相同的氮气注入量下,气水比为1∶2、段塞数为2的注入方案驱油效果最好。结论水氮气交注非混相驱是鄂尔多斯盆地低渗透油藏水驱后改善驱油效果的一项有效措施;低渗透油藏实施超前注气不仅能够有效保持地层能量,实现低渗透油藏的高效开发,而且能够节约水资源。更多还原

【Abstract】 Aim To research the infuences of immiscible N2 WAG flooding in low permeability reservoir of Ordos Basin,and provide the basis for optimizing the embodiment.Methods The physical simulation experiments and theoretical studies were uesed to analyse the effcets of different injection patterns and the WAG radio and the number of WAG slugs to the displacement efficiency.Results The final displacement efficiency of M2 WAG after gas injection is 10.42% more than the M1 WAG after water flooding;under the condition of the same injected volume of N2,the combination of the 1∶2 WAG radio and two WAG slug is the optimal injection case.Conclusion For the low permeability reservoir of Ordos Basin,immiscible N2 WAG flooding is a good measure to improve the displacement effect after water flooding;the advanced gas(N2) injection can not only maintain the reservior pressure to enhance the oil recovery,but save the water resource.更多还原