彰武断陷钻头优选及应用

Abstract

彰武断陷位于松辽盆地南部，该地区地层岩性复杂，含有砾石层、火山岩层等难钻地层。初始完钻的12口井，平均机械钻速仅4.65 m/h，过低的机械钻速将严重影响到彰武断陷后期开发进程和经济效益。本文为解决彰武断陷区块钻井过程中机械钻速低这一问题，开发过程中采用主因子法对该区块各地层已使用的钻头进行了滚动评价，并将优选出的钻头序列用于指导下口井的钻头选型。2012年与2011年已钻井的平均机械钻速对比表明，利用主因子法优选出的钻头序列显著地提高了彰武断陷的机械钻速，主因子法可用于该地区的钻头选型。 Zhangwu fault depression is located in the south of Songliao Basin, where the strata’s lithology is complex, including difficult drilling formation such as gravel and volcanic rock formations. The average rate of penetration of 12 early drilled wells was only 4.65 m/h, which would seriously affect later development process and economic benefits of Zhangwu fault depression. To address this issue that the drilling process of Zhangwu fault depression experienced a low rate of penetration in this paper, principal factor method was adopted during development process for rolling evaluation on the used bits of each layer, and the selected bit sequences were used as a reference for bit type selection of next wells. The contrast of average rate of penetration in 2012 and 2011 shows that bit sequences selected with principal factor method dramatically improved the rate of penetration in Zhangwu fault depression, and principal factor method can be used for bit type selection in this area.