轴流式脉冲发生器的优化设计及现场应用

Optimal Design and Field Application of Axial Flow Pulse Generator

“极限钻井参数”钻井施工中,会出现大排量、高密度钻井液对轴流式脉冲发生器主阀、限流环的冲蚀严重的问题。为了提高该工具的抗冲蚀能力,延长井下作业时间,文章运用理论模拟计算与CFD仿真相结合的方法,从结构和材质上对轴流式脉冲发生器关键部件主阀、限流环进行优化设计。CFD仿真表明优化后的主阀、限流环流道中,流速降低了31.96%,流道静压力降0.25 MPa,信号强度增量为0.041 MPa,与理论模拟计算相互印证。现场应用结果表明,改进后的轴流式脉冲发生器能够满足极限钻井参数情况的苛刻要求,井下工作时间平均延长了120 h,在跃满X等深井的实际应用中取得了良好的效果。

In the drilling with extreme drilling parameters,serious erosion of the main valve and restrictor ring of the axial flow pulser by the large displacement and high-density drilling fluid will occur.In order to improve the erosion resistance of the tool and extend the downhole operation time,this paper proposes a method of combining theoretical simulation calculation and CFD simulation.The main valve and restrictor ring of the key components of the axial flow pulse generator are optimized in terms of structure and material.The CFD simulation results show that in the optimized main valve and restrictor loop,the flow rate is reduced by 31.96%,the static pressure drop of the flow channel is 0.25 MPa,and the signal increment is 0.041 MPa,which is mutually confirmed by the theoretical simulation calculation.Field application results show that the improved axial flow pulse generator can meet the requirements of extreme drilling parameters,and the downhole working time has been extended by an average of 120 h.It has achieved good results in the practical application of deep wells such as Well Yueman xxx.