页岩横观各向同性储层水平井井周应力预测模型
发布时间:2018-05-28 11:11
本文选题:页岩 + 水平井 ; 参考:《科学技术与工程》2017年24期
【摘要】:致密页岩储层进行水平井钻井和压裂改造时,为了精确确定页岩气储层水平井的井周应力,在页岩岩石力学特性的基础上,建立了考虑页岩横观各向同性的本构模型和页岩气储层的地应力模型,并进而建立了页岩气储层水平井的井周应力模型。通过分析页岩气水平井井周应力的分布规律,结果表明:水平和垂直弹性模量比、地应力比和孔隙压力对井周应力的分布有较大影响,而泊松比的影响相对比较小。该致密页岩储层水平井井周应力的计算方法,可为页岩气水平井的钻井和压裂改造提供理论参考和指导。
[Abstract]:In order to accurately determine the stress around the horizontal well of shale gas reservoir when drilling and fracturing in a horizontal well in tight shale reservoir, based on the mechanical properties of shale rock, The constitutive model of shale transversely isotropic and the in-situ stress model of shale gas reservoir are established, and the model of borehole stress in horizontal well of shale gas reservoir is established. The results show that the horizontal and vertical elastic modulus ratio, in-situ stress ratio and pore pressure have great influence on the distribution of borehole stress, while Poisson's ratio has little effect on the distribution of borehole stress. This method can provide theoretical reference and guidance for drilling and fracturing of shale gas horizontal wells.
【作者单位】: 中海油研究总院;
【基金】:中海石油(中国)有限公司项目(YXKY-2016-ZY-08,FQTFWQYZL-14-071,FLSFWLSYJ-15-168)资助
【分类号】:TE311
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