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首页> 外文期刊>Tunnelling and underground space technology >Investigation of cuttings transport in directional and horizontal drilling wellbores injected with pulsed drilling fluid using CFD approach
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Investigation of cuttings transport in directional and horizontal drilling wellbores injected with pulsed drilling fluid using CFD approach

机译：使用CFD方法研究注入脉冲钻井液的定向井和水平井井眼中的岩屑运移

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摘要

Efficient cuttings transportation is a significant issue in wellbore drilling. The pulsed jet drilling technology is known to improve the rate of penetration (ROP), but lacks targeted research into its effect on cuttings transport. We presented a CFD model based on Eulerian-Eulerian method to investigate the cuttings transport characteristics in horizontal and directional wellbores injected with pulsed drilling fluid. Kinetic theory of granular flow was used to formulate the stress tensor of cuttings particles, and sliding mesh method was used to achieve the rotation of the drill pipe. The wave propagation of the flow of cuttings particles was analyzed from the variation of amplitude and frequency of the inlet velocities of pulsed drilling fluids. Effects of drilling fluid rheological properties and hole and pipe diameters on borehole cleaning in traditional and pulsed drilling were studied. Numerical results indicated that the pulsed drilling fluid contributes to borehole cleaning because it significantly reduces the cuttings concentration in the moving bed zone and increases the velocities of cuttings in the fixed bed zone. Increasing amplitude and frequency of the inlet velocity of pulsed drilling fluid also leads to a decrease of the height of cuttings bed. The pulsed drilling fluid produces higher turbulent kinetic energy and lower turbulent dissipation rate comparing with the case with a constant drilling fluid velocity. Furthermore, pulsed drilling was also proved to be universally applicable to the improvement of cuttings transport within a wide range of drilling fluid rheological parameters and hole and pipe diameters.
机译：高效的钻屑运输是井筒钻探中的重要问题。众所周知，脉冲喷射钻井技术可提高钻速（ROP），但缺乏针对钻屑运输效果的针对性研究。我们提出了一种基于欧拉-欧拉方法的CFD模型，以研究注入脉冲钻井液的水平井和定向井中的岩屑运移特征。利用颗粒流动的动力学理论来制定钻屑颗粒的应力张量，并采用滑动网格法实现钻杆的旋转。从脉冲钻井液进口速度的幅度和频率变化分析了屑屑流的波传播。研究了传统和脉冲钻井中钻井液的流变特性，孔和管道直径对井眼清洁的影响。数值结果表明，脉冲钻井液有助于降低井眼清洁度，因为它显着降低了移动床层中的钻屑浓度，并增加了固定床层中的钻屑速度。脉冲钻井液入口速度的幅度和频率的增加也导致岩屑层高度的降低。与恒定钻井液速度的情况相比，脉冲钻井液产生更高的湍动能和更低的湍流耗散率。此外，脉冲钻井也被证明普遍适用于在广泛的钻井液流变参数以及孔和管径范围内改善钻屑的输送。

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