【摘 要】
：
考虑三向地应力、液柱压力、孔隙压力和射流速度的影响,建立射流冲击井底岩石流固耦合模型,运用有限元及有限体积法进行求解.结果表明:井底压差越大,井底岩石最大主应力越大;
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考虑三向地应力、液柱压力、孔隙压力和射流速度的影响,建立射流冲击井底岩石流固耦合模型,运用有限元及有限体积法进行求解.结果表明:井底压差越大,井底岩石最大主应力越大;射流最大冲击压力与速度平方成正比,孔隙压力在冲击面和冲击轴线上随距离增加均呈"三次抛物线"减小;射流冲击井底岩石存在明显的局部效应,射流主要影响区域在冲击面上约为2倍射流半径,在冲击轴线上约为2.5～3.5倍射流半径,与应力波理论结果相吻合.
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