二次射孔对筛管强度影响的有限元分析　

Finite element analysis of effect of secondary perforation on screen pipe strength

王旱祥 刘延鑫 陈一男 兰文剑 孟繁宇

WANG Hanxiang LIU Yanxin CHEN Yi LAN Wenjian MENG Fanyu

中国石油大学机电工程学院，山东青岛　266580 胜利油田公司桩西采油厂，山东东营　257237

为了研究二次射孔对筛管剩余强度影响的变化规律，利用有限元分析软件ANSYS分别建立了井下二次射孔时新旧两孔处于两种不同情况下的有限元模型，模拟分析了二次射孔对筛管剩余强度的影响，研究结果表明：在进行二次射孔时，最佳射孔位置为中线附近区域，此时不仅能保证油气流通面积、提高采油效率，并且可以使筛管的剩余强度提高，达到了二次射孔的目的；在二次射孔时应尽量避免出现新孔与旧孔相交的情况，若不得已出现，要保证相交孔圆心角大于90°，并且随着圆心角的增大，筛管剩余强度也不断增大。

In order to understand the effect of secondary perforation on screen pipe strength, the finite element models of bullet hole were established with the help of software ANSYS when the positions of secondary and original perforation were different, and then the effect of secondary perforation on the residual intensity of screen pipe was analyzed. The results show that the best position for secondary perforation is regions near the midline. With the favorable position, large oil and gas flow area can be ensured which will result in higher oil recovery efficiency. And the goals of secondary perforation can be met by enhancing residual intensity of screen pipe. At the same time, the intersection of secondary and original perforation bullet hole should be avoided, if it can’t be avoided, the cross hole central angle should be more than 90 degree, because that the residual strength will grow with the increase of central angle.