特高含水期同步周期注采现场试验效果

FIELD TEST RESULTS FOR SYNCHRONOUS CYCLIC INJECTION- PRODUCTION AT THE EXTRA-HIGH WATER CUT STAGE

在大量的周期注水、周期采油理论研究及现场试验的基础上，提出了同步周期注采技术。对特高含水期同步周期注采机理开展了理论研究，推导出可表征周期注采附加压力差的油水运动方程，为开展周期注采现场试验提供了理论依据。通过数值模拟分析，优化同步周期注采方式及各项参数。根据理论研究及数值模拟研究结果，开展了同步周期注采现场试验，将周期注水与周期采油以优选的方式进行组合。通过2年的现场试验，取得了节约注水、减缓含水上升速度、减缓递减的较好效果，形成了一套与开发区块开采特点相适应的同步周期注采选井方法、方案及参数优化的方法和技术界限。通过开展周期注采现场试验，探索了同步周期注采技术在改善区块开发效果、提高采收率方面的作用。

On the basis of many theoretical researches on cyclic waterflooding and production together with field test, synchronous cyclic injection-production technique is submitted. According to the theoretical research for synchronous cyclic injection-production mechanism at the extra-high water cut stage, the oil/water motion equation that characterizes additional pressure differential of cyclic injection-production can be deduced, which provides the theoretical foundation for the field test of cyclic injector-producer. The synchronous cyclic injection-production mode and various parameters are optimized by analyzing the numerical stimulation. Based on the theoretical research and results of numerical stimulation, cyclic waterflooding integrates with cyclic production as the optimization mode in the field test of synchronous cyclic injection-production. Better effects, including saving water injection amount, slowing down the ascending velocity of water cut and reducing the decreases, are obtained by 2-year field test, mo- reover, a serious of synchronous cyclic injection-production method and plan that fits the production characteristics of the development block together with way and technical limit of parameter optimization are formed. The effects of synchronous cyclic injection-production technique on improving development effect of blocks and enhancing recovery factor are explored under the field test of cyclic injection-production.