马36区块氮气泡沫水交替驱室内评价研究

LAB RESEARCH OF NITROGEN ALTERNATING FOAM WATER INJIECTION IN M36 BLOCK RESERVIOR

应用马 36 5 5井地面分离器油气样按气油比 2 4 .7m3 /t进行配样 ,并用马 36井区新下23 和新下24 5的两组天然岩心进行了长岩心实验测试 ,研究注氮气泡沫水交替的驱油效率。研究表明 ,在水驱的基础上 ,第一组岩心新下23 氮气 /水交替提高采收率 6 %左右 ,氮气 /泡沫水交替提高采收率 1 0 %左右 ,如若继续实验 ,采收率还会进一步提高。第二组岩心新下24 5氮气 /水交替提高采收率 3%左右 ,氮气 /泡沫水交替提高采收率 8%左右 ,同样如若继续实验 ,采收率仍会进一步提高。注泡沫水交替效果明显 ,获得的采收率更高。但是注泡沫水交替的时间较长 ,注入体积较大 。

Using synthetic fluids of separate oil and gas samples from Ma36-5-5 well compounded according to gas oil ratio 24.7(m^3/t,) flooding experiments are conducted upon two groups of long real formation cores from Xinxia^2_3 and Xinxia^2_(4-5) of Ma36 well block to research flooding efficiencies by nitrogen alternating foam water injection. Results show that the recovery enhanced by nitrogen alternating water injection with the core of Xinxia^2_3 is 6% or so and enhanced by nitrogen alternating foam water injection is 10% or so. And with the core of Xinxia^2_(4-5), the recovery enhanced by nitrogen alternating water injection is (3%) or so, while enhanced by nitrogen alternating foam water injection is 8% or so. It is also demonstrated that the displacement efficiency by foam water alternating injection is more obvious, and the enhanced recovery is higher, but it needs longer injection time and bigger injection volume, and the injection pressure also rises quickly.