子寅油田仑16块周期注水试验研究

百色盆地子寅油田仑16块砂岩油藏已进入特高含水开发后期,水驱剩余可采储量少,注水开发效果差,为提高区块采收率和开发效果,开展了周期注水先导试验。试验结果表明:周期注水改善了水驱开发效果,产油平稳,含水下降2．41%,采收率提高5．57%。在降压半周期动态表现为:含水下降、含水平稳和含水波动略有上升三个阶段;各井组单位压降产液也出现逐渐上升、相对平稳和略下降三个阶段。注水周期以4～6个月比较合适。该试验的成功对砂岩油藏周期注水改善开发效果具有重要的指导意义。

Research on cyclic waterflooding in Lun 16 block of Ziying oilfield

Lun-16 block sandstone oil reservoir in Ziyin oilfield of Baise basin has entered the late stage of super-high water cut,the surplus recoverable resources with water drive is decreasing and the water-flooding efficiency be- comes poor.In order to enhance the recovery ratio and de- velopment effect,cyclic flooding experiment has been worked out.The result indicates the waterflooding devel- opment effect is improved through the cyclic flooding,the oil production becomes steady,water cut drops 2.41%, and tbe recovery ratio increases 5.57%.The alternations of the water cut in depressure cycle have three stages:ris- ing,steady and undulation to have slightly drops.The produced fluids per unit pressure drop of various wells group also appear three phases:drops gradually,relative- ly steady,drops slightly.The water-injection cycle is appropriate by 4-6 months.This experimental success has great guidance for the waterflooding development effect of the sandstone oil reservoir.