高频液力扭转冲击钻井提速工具设计与分析

Design and Analysis of High Frequency Hydraulic Torsional Impact Drilling Acceleration Tool

PDC钻头钻遇中硬及软硬交替地层时极易产生黏滑现象,导致钻柱扭转振荡、钻进过程不稳定,机械钻速急剧下降。为解决上述难题,设计一种高频液力扭转冲击钻井提速工具。该设备主要由扭转冲击元件、承载连接元件及相应附件组成,通过内部流道产生的节流压差驱动扭转冲击元件产生高频往复的冲击扭矩,减弱或消除黏滑振动对钻头使用寿命的影响。地面试验和现场应用结果表明:该工具通过水力循环可稳定输出高频冲击扭矩,在桃2-4-18A井、坨203井、延491井进行了现场应用,与邻井相比机械钻速平均提高30%以上。该设备具有较好的市场应用前景且为深井、超深井钻井提速降本增效提供了技术支撑。

Stick-slip easily happens when PDC drill bit encounters the medium hard and soft hard formation alternately,which leads to the torsional oscillation of the drill string,the instability of the drilling process and the sharp decrease of the drilling rate.In order to solve the above problems,a high frequency hydraulic torsional impact drilling acceleration tool was put forward.The device was mainly composed of torsional impact parts,bearing connection parts and corresponding accessories.All of these were driven by the throttling differential pressure built up in internal flow channels to generate high-frequency reciprocating impact torque,and the impact of stick-slip vibration on the service life of the bit was weakened or eliminated.The ground test and field application results show that the tool can output stable high frequency torque through hydraulic circulation,and has been applied in well Tao 2-4-18 A,well Tuo 203 and well Yan 491;compared with adjacent wells,the penetration rate has increased by more than 30%on average.The device has a remarkble market prospect,and provides technical supports for rapid drilling in deep and ultra-deep wells.