机械式随钻小井眼扩孔工具研制与应用

摘要

In order to reduce risk of drilling side-tracked small hole and improve cementing quality, a kind of mechanic reamer for 118 mm hole was developed.It is connected with bit directly, which realizes reaming while drilling.The torsional strength of shaft by contrasting was calculat-ed.It also analyzed how cutter distribution parameters affected rock breaking efficiency.It has been tested in field successfully.This tool has reasonable size and stable structure.It matches con-ventional drilling technology and tools.The result shows that it can meet the technical require-ment of drilling side-tracked small hole.%为降低侧钻小井眼钻井作业风险，提高固井质量，针对118 mm 井眼研制了一种机械式随钻扩孔工具。对比计算了传动轴结构强度，分析了切削齿布齿参数对工具破岩效率的影响，并进行了现场试验。该扩孔工具尺寸合理，结构可靠，与常规钻井工具及工艺匹配。现场使用结果证明，扩孔工具可满足套管内侧钻井随钻扩孔工艺技术要求。