深部地层扭力冲击器破岩提速效果评价及应用

Evaluation of Rock Breaking Acceleration Effect of Torsional Impactor in Deep Formation

中深层是渤海油田进一步勘探开发的重点,但在钻探过程中面临各种各样的挑战,其地层抗压强度高,破岩难度大,机械钻速低,钻井周期长等特点导致渤海中深层勘探经济性差。为了解决中深层钻具憋跳严重及机械钻速慢的问题,渤海油田引入了扭力冲击器提速工具,为定量认识提速机理,建立了扭力冲击器的扭转力学特性模型,通过Abaqus有限元软件模拟了在扭冲条件下,PDC钻头的破岩过程,分析静载与扭冲条件下的破岩比功。结果表明,安装扭力冲击器后的破岩效率可提高约36%。在渤海某探井实现了现场实施,机械钻速提升了73%。研究成果对渤海油田中深层钻进提速及参数优化有一定的参考意义。

Middle-deep layers are the focus of further exploration and development of the Bohai oilfields,but they face various challenges in the drilling process,and their characteristics such as high formation compressive strength,difficult rock breaking,low mechanical drilling speed and long drilling cycle lead to poor economics in the middle and deep exploration of the Bohai Sea.In order to solve the problems of serious choking of medium and deep drilling tools and slow mechanical drilling speed,the torsion impactor speeding tool was introduced in the Bohai Oilfield,but there was still a lack of quantitative understanding of its speed-up mechanism.In order to quantitatively understand the mechanism of speeding up the tool,the torsion mechanics model of the torsion impactor was set up,and the rock-breaking process of the PDC drill bit under the torsion impulse conditions was simulated through the Abaqus finite element software to analyze the specific work of the rock-breaking under the conditions of static loading and torsion impulse.The results show that the rock-breaking efficiency can be increased by about 36%after the installation of the torque impactor.It has certain reference significance for the speed up and parameter optimization of medium and deep drilling in the Bohai Oilfield.