中国石油大学学报（自然科学版）2017，Vol.41Issue(5)：80-86,7.DOI:10.3969/j.issn.1673-5005.2017.05.009
静态推靠式旋转导向钻井工具防自锁设计方法
A design method to prevent self-locking of a static push-the-bit rotary steerable drilling tool
摘要
Abstract
In this study, according to the structure and working principle of a static push-the-bit rotary steerable ( SRS) drilling tool, analytical models of the loading condition and force balance of the SRS drilling tool have been figured out, and a method to optimize the front chamfer design was established, which can prevent the self-locking risk of SRS system effec-tively. In a case study, the variations of the actual weight-on-bit ( WOB) due to the front chamfer, the variations of the front chamfer due to the total pushing forces and the maximum nominal WOB were analyzed. The results show that whether the steerable pads run into a self-locking state against the ladders on wellbore wall is dependent on the front chamfers, the drill-ing parameters ( i. e. the total pushing force and weight-on-bit) and the friction coefficient. The actual WOB decreases with the front chamfer quickly. The maximum front chamfer decreases with the total pushing force sharply, but it increases with the maximum nominal WOB rapidly, and decreases with the side chamfer slightly. For the SRS drilling tool in a Φ216 mm wellbore, the recommended front chamfer is of 45°or so, and the recommended side chamfer is between 45° to 60°, and a larger side chamfer should be matched to a smaller front chamfer.关键词
旋转导向钻井系统/静态推靠式/受力分析/自锁/倒角/优化设计Key words
rotary steerable drilling system/static push-the-bit/force state analysis/self-locking/chamfer/optimization de-sign分类
能源科技引用本文复制引用
史玉才,孙海芳,岳步江,管志川,王恒,苗在强..静态推靠式旋转导向钻井工具防自锁设计方法[J].中国石油大学学报（自然科学版）,2017,41(5):80-86,7.基金项目
国家自然科学基金项目(51674284) （51674284）
国家科技重大专项(2016ZX05022-002) （2016ZX05022-002）
