考虑应力敏感的低渗透底水油藏见水时间预测

发布时间：2018-05-03 16:22

本文选题：低渗透油藏 + 应力敏感　；参考：《大庆石油地质与开发》2017年03期

【摘要】：目前预测低渗透底水油藏油井见水时间没有考虑渗透率应力敏感问题,基于低渗透底水油藏的渗流特征和储集层介质的压力敏感性等特点,推导出了考虑应力敏感等多因素影响的低渗透底水油藏底水突破时间预测公式。分析了应力敏感、启动压力梯度及油水黏度比对底水突破时间的影响。研究表明:应力敏感系数越大,底水突破越早;随着启动压力梯度增加,底水与井底之间的压力差值越大,底水突破的时间提前;油水黏度比越大,油井见水时间越早;油井见水时间随着产量的增加而提前,因此合理地设计生产井产量,可以延长油井无水采油期。
[Abstract]:At present, the problem of permeability stress sensitivity is not taken into account in predicting the water breakthrough time of oil wells in low permeability bottom water reservoirs, but based on the characteristics of percolation characteristics of low permeability bottom water reservoirs and pressure sensitivity of reservoir media, etc. The prediction formula of breakthrough time of bottom water in low permeability bottom water reservoir is derived considering the influence of stress sensitivity and other factors. The effects of stress sensitivity, starting pressure gradient and oil / water viscosity ratio on breakthrough time of bottom water are analyzed. The results show that: the greater the stress sensitivity coefficient, the earlier the breakthrough of bottom water, the greater the pressure difference between bottom water and bottom hole, the earlier the breakthrough time of bottom water, the greater the viscosity ratio of oil and water, the earlier the water breakthrough time of oil well is, with the increase of starting pressure gradient, the greater the pressure difference between bottom water and bottom hole is, the earlier the breakthrough time of bottom water is. The water breakthrough time of oil wells is advanced with the increase of production rate, so reasonable design of production wells can prolong the water free oil recovery period of oil wells.
【作者单位】：西南石油大学油气藏地质及开发工程国家重点实验室;
【基金】：国家自然科学基金青年科学基金项目“考虑启动条件和井筒压降的底水油藏分支水平井水脊耦合模型”(51404201) 国家科技重大专项“厚油层水驱过程中驱油效率及剩余油分布模式实验”(2011ZX050102003)
【分类号】：TE348

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