旋冲螺杆钻具在临盘油田的试验应用

Field testing of rotary-percussive PDM in Linpan Oilfield

本文阐述了旋冲螺杆钻具的结构原理及主要性能参数,该工具可以将冲击破岩和PDC钻头剪切破岩相结合,集合冲击钻井和螺杆钻井的各自优势,改善钻头的工作状态,大幅度提高机械钻速;该工具降低钻具摩阻,应用于定向井可以提高定向钻井效率。该工具冲击力与钻压成正相关关系,冲击频率与马达转速成正比。178 mm旋冲螺杆钻具分别在临盘油田直井和定向井进行了试验应用,复合钻进机械钻速与邻井相比提高了22.1%~41.8%,滑动钻进机械钻速同比提高了51.1%,对加快油田勘探开发速度、降低钻井成本有积极的意义。

The structural principle and main performance parameters of the rotary-percussive PDM are elaborated in this paper.With the combination of impact rock crushing with shear rock cutting of the PDC bit,the tool can provide both the advantages of percussion drilling and PDM drilling,and improve the drill bit’s working performance,resulting in higher ROP.It can also reduce drag forces;thus increasing directional drilling efficiency.The tool impact force has a positive correlation with the weight on bit while the impact frequency is directly proportional to the motor rpm.Tests of the 178mm drilling motors have been carried out in drilling vertical and directional wells in Linpan Oilfield respectively.ROP in compound drilling was improved by 22.1%~41.8% compared with that of the adjacent well,while the slide drilling ROP was increased by 51.1%,which is of positive significance for speeding up the oilfield exploration and development and reducing drilling cost consequently.