任丘雾迷山组油藏恢复注水数值模拟研究

受环保及地层压力下降的制约,任丘雾迷山组油藏在经历了 8年的降压开采后,1999年需恢复注水。为获得既经济又有效的开发效果,进行了恢复注水各项技术政策界限的数值模拟研究。通过计算不同注采比、不同产液量及不同井网条件下的各项开发指标,确定了油藏合理压力保持水平和压力恢复速度。同时,采用经济可采储量及经济可采储量货币值进行了不同方案的经济效益评价,优选了最佳注水方案。近 2年的恢复注水实践表明,数模结论与矿场实际基本一致,即对于降压开采油藏在接近或达到压降极限时恢复注水后应保持较低的注采比和较低的压力水平开采,可以最大限度地利用天然能量,使弹性油量继续聚集,进一步发挥降压开采的作用,保持较好的开发效果。

The Research of Simulation of Water injection Re-Applied of Wumishan Reservoirs (Renqiu)

Due to the environmental and formation pressure decrease restrictions, since 1999 water injection was re-applied after 8 years of pressure decrease development of Wumishan Reservoirs. If water injection was applied, what should be the perfect pressure level and the pressure restoration rate to maximize the output economically. To answer this question, numeric simulations was calculated for various injection/output ratios, liquid outputs and well patterns, to determine the appropriate (or rational) pressure levels and pressure restoration rate. Meanwhile, economic evaluations of every development program were computation to help to determine the best project. The practice of water injection showed that it was consistent with the conclusion of numeric simulations. The adopted development project was to inject water only when the reservoir pressures drop to its limit, and maintain at low injection/output ratio and pressure level to utilize natural energy of reservoirs completely.