摘要
为了解射流式水力振荡器的振动对井底钻具结构强度的影响程度, 利用CFD 数值模拟方法和地面试验方法分别对其振动频率进行了研究, 分析了振动频率和振动位移随排量变化的规律; 同时对射流式水力振荡器的提速效果在张海某井进行了现场验证.分析结果表明, 不同排量下射流式水力振荡器的振动频率在6. 5～9.8 Hz 内变化, 振动频率较小且小于10 Hz, 说明振动频率受排量影响不大, 随着输入排量的增大, 振动频率呈现缓慢增大的趋势; 射流式水力振荡器不仅对MWD 的信号传输没有影响, 而且具有显著提高钻井机械效率的作用, 可明显减小钻井摩阻,缓解托压现象.所得结论对水力振荡器的优化和钻井工艺设计具有指导意义.
The jetting hydraulic oscillator working principle is introduced. CFD numerical simulation and ground test have been conducted to study the tool's vibration frequencies. The effects of discharge capacity on vibration frequency and vibration displacement have been studied. Application of the oscillator in a well in Zhanghai has verified the tool's ROP improvement performance. The results show that the hydraulic oscillator's vibration frequency varies within 6. 5 ~ 9. 8 Hz within the displacement range, which is relatively small and less than 10 Hz. The vibration frequency effect on the bottomhole assembly is theoretically benign. The vibration frequency has slightly been influenced by the discharge change,and slowly increases with the increase of input discharge. The jetting hydraulic oscillator could significantly improve the drilling efficiency,reduce the drilling friction and relieve the weight stacking without impact the MWD signal transmission.
出处
《石油机械》
2016年第1期20-24,共5页
China Petroleum Machinery
基金
中石油科学研究与技术开发项目"华北油田上产稳产800万吨关键技术研究与应用"(2014E-350)
中石油渤海钻探工程有限公司技术研发项目"钻井用井下水力振荡器工具及技术研发"(2013Z028K)
中石油华北油田分公司科技项目"华北油田钻完井技术研究与应用"(2013-HB-Z07)
