考虑井筒压降的水平井流入能力分析

Analysis of Inflow Capacity in Horizontal Wells with Wellbore Pressure Drawdown

通过在单相、稳态的条件下建立储层渗流和井筒流动的耦合模型来计算水平井的产能,并且建立了井筒压降对水平井稳态产能计算的误差模型,在此基础上对水平井稳态产能计算的影响因素进行了敏感性分析。研究表明,当水平井段长度为400m,井筒内壁相对粗糙度为0.01时,产能为1150m3/d,产能误差E为10%。产能误差E的引入更有效地分析了水平井流入能力的适用范围,当E大于10%时,由于压降引起的产能误差不能忽略,即E的允许上限为10%。

Under the condition of single facies and steady status,a coupling model for reservoir percolation and wellbore flow was established for calculating productivity of horizontal wells.An error model was established for calculating wellbore pressure drawdown on steady productivity of horizontal wells,on the basis stated,the sensitivity of influential factors on steady productivity calculation in horizontal wells was analyzed.Study shows that when the horizontal section is 400m long and the relative roughness of well bore is 0.01,productivity is 1150m3/d and productivity error E is 10%.By using E,the application range of inflow capacity in horizontal wells is analyzed more effectively.When E is more than 10%,it can not be ignored,therefore,the upper limit of E is 10%.