摘要
粒子冲击钻井是将2%～5%的钢质粒子加入到钻井液,利用粒子冲击和钻头切削齿联合破岩,从而实现高效破岩,提高钻井速度的一项钻井新技术。文章从粒子钻井公司粒子钻井钻头、粒子注入回收系统、粒子钻井技术现场试验等方面综述了该技术最新的研究进展和取得的成果。采用ANSYS/LS-DYNA有限元软件建立了粒子冲击破岩有限元模型,研究分析了粒子冲击破岩的机理以及侵入深度随粒子直径、入射角度、入射速度、粒子材质等参数对粒子破岩效果的影响。结果表明粒子与岩石碰撞的瞬时具有极高的瞬时应力,足以超过岩石的抗压强度;粒子初速度在100～200m/s范围之间比较合适;粒子直径在1～3mm之间为宜;随着入射角度的增加,粒子侵入岩石的深度逐渐减小,入射速度的法向向量起着重要的作用;钢粒的破岩效果要优于陶粒。
Particle impact drilling is a new technology that can highly enhance ROP by injecting 2%～5% steel particles into drilling fluid, and achieve efficient rock breaking by particle impact combined with bit cutting teeth. The new research progress and achievement were introduced including particle impact drilling bit,particle injecting and recycling system, filed test of particle impact drilling technology by PDTI in USA. Using ANSYS/LS-DYNA finite element software simulated the process of the particles impacting rock, and analyzed microscopic mechanism of impacting rock, and affection of invasion depth changes with particle diameter, incident angle, impacting velocity and particle material quality, etc on rock-breaking effect. The results showed that high instantaneous stress emerged in the particle impacting rock process, appropriate particle initial velocity was 100～200m/s, appropriate particle diameter was 1～3mm, particle invasion depth reduced gradually with incident angle increasing, velocity normal vector played an important role. The rock breaking effect of the steel was better than ceramsite.
出处
《钻采工艺》
CAS
北大核心
2013年第1期1-5,7,共5页
Drilling & Production Technology
基金
中石油十一五科技攻关项目"粒子冲击钻井技术研究"(2008A-2301)
中石油十二五重大科技专项"钻井新技术新方法研究"(2011A-4201)
山东省自然科学基金重点项目"粒子冲击钻井技术理论与关键技术"(ZR2010EZ004)
关键词
粒子冲击钻井
研究进展
现场试验
数值模拟
破岩
particle impact drilling, research progress, filed test, numerical simulation, rock breaking
