石油钻采工艺Issue(5)：1-4,4.DOI:10.13639/j.odpt.2014.05.001
近钻头扭转冲击器破岩机理及应用
Rock fragmentation mechanism and application of near-bit torsion impacter
摘要
Abstract
PDC bit is the main rock-breaking tool in hard formation of ultra-deep wells. Its premature failure due to the stick-slip vibration is an important factor that results in increasing the drilling cost in ultra-deep wells. According to its stick-slip vibration effects, this paper analyzed stick-slip vibration mechanism theoretically, established the mechanical model of PDC bit stick-slip vibration sys-tem, and used high frequency-low amplitude torsion impact generator and bit structure optimization, for eliminating the drill stick-slip vibration. The results show that:length of PDC bit is longer, as a result, energy decays faster and energy transfer efifciency of torsion impacter is lower;section area is larger, as a result, length is smaller and energy transfer efifciency of high-frequency torsion impacter system is higher; Xinjiang Tarim Basin XK3 Well tests show that torsional impact tools could improve penetration rate more than doubled compared with the conventional drilling, could eliminate the stick-slip vibration effects of PDC bit, and could reduce the drilling string torsion oscillations and the drilling cost.关键词
PDC钻头/扭转冲击器/黏滑振动/钻头优化/传递效率Key words
PDC bit/torsion impacter/stick-slip vibration/drill bit optimization/transfer efifciency分类
能源科技引用本文复制引用
李玮,何选蓬,闫铁,王树超..近钻头扭转冲击器破岩机理及应用[J].石油钻采工艺,2014,(5):1-4,4.基金项目
国家科技重大专项“碳酸盐岩、火成岩及酸性气藏高效安全钻井技术”（编号2011ZX05021-002）部分研究成果。 （）
