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侧钻井储层伤害评价是后期完井作业和增产措施的一项重要的设计依据,也是评价前期侧钻井造成井底伤害的一项重要指标,因而评价侧钻井对油层的伤害研究是油田急需解决的一项课题.从渗流角度讲,侧钻井是水平井渗流的一种近似,因此不能沿用裸眼井复合油藏试井模型.本研究从考虑广泛的侧钻井完井方法入手,建立侧钻井对砂岩储层伤害的不稳定渗流数学物理模型,采用比差分法和有限元法更节时、省力的边界元数值方法求解,然后合理组合相关参数团,绘制标准图版,从而计算出侧钻井引起的表皮系数和污染半径,评价侧钻井对储层的伤害.“,”The evaluation of the damage of sidetracking to reservoir is an important design basis for final well completion operation and well stimulation,and also is an important index for evaluating the bottom hole damage caused by preliminary sidetracking,therefore,the research on evaluating the damage of sidetracking to reservoir is a task that is necessary for oil field to urgently solve.From the point of view of seepage flow,sidetracked well is similar to horizontal well,thus,the open hole well composite reservoir test model can not be adopted.In this study,starting with the consideration of various sidetracked well completion methods,an unsteady seepage flow mathematical physical model representing the damage of sidetracking to sandstone reservoir is set up and boundary element numerical method which is more time saving and more labor saving than the difference method and finite element method is used for acquiring the solution.And then,through rationally combining the correlation parameters group and drawing up the standard chart,the skin factor and pollution radius caused by sidetracking are calculated and the damage of sidetracking to reservoir is evaluated.