焊管2025，Vol.48Issue(11)：52-63,12.DOI:10.19291/j.cnki.1001-3938.2025.11.007
水平段起下钻压力波动流固耦合动力学仿真研究
Fluid-structure Interaction Dynamic Simulation of Pressure Fluctuation in Horizontal Section during Tripping Operations
摘要
Abstract
During tripping operations,the pressure fluctuation in the horizontal section caused by drill string motion interacts with wellbore constraints,forming complex fluid-structure interaction effects that directly influence stress distribution and wellbore integrity.A three-dimensional dynamic model was established that integrates pressure fluctuation and drill string motion based on fluid-structure interaction theory,which was validated experimentally for accuracy.The results indicate that the wellbore bottom constraint intensity exerts a significant influence on the fluid-structure interaction effect.Under the strong constraint conditions,the coupled analysis reveals an increase in the maximum equivalent stress of the drill string by over 30 MPa compared to the decoupled solution,with the stress concentration predominantly localized near the drill bit at the bottom of the wellbore.In contrast,weak constraints result in a stress difference below 10 MPa,allowing simplified models for stress field prediction.By establishing a localized equivalent computational model,the dynamic stress field of the drill string across various depths within the wellbore was characterized with enhanced precision.The model reveals a 1∶1 syn-chronization between pressure fluctuation frequency and drill string motion frequency,confirming the positive correlation between wellbore fluctuation and rotational frequency in horizontal wells.Further analysis indicates that when the weight on bit exceeds 90 kN and rotational speed surpasses 52.08 r/min,the amplitude of stress fluctuations induced by interaction effects gradually reaches a steady state.This stabilized critical condition not only establishes critical thresholds for optimizing hydraulic parameters during drilling in extended horizontal sections but also provides a theoretical basis for the dynamic design optimization of drill strings in ultra-deep wells and for the accurate evaluation of wellbore integrity.关键词
流固耦合/压力波动/钻具运动/起下钻/井筒力学特征Key words
fluid-structure interaction/pressure fluctuation/drill string motion/tripping operations/wellbore mechanical characteristics分类
信息技术与安全科学引用本文复制引用
周志远,林蓬,严梁柱,吴涵,王丰毅,杨文强..水平段起下钻压力波动流固耦合动力学仿真研究[J].焊管,2025,48(11):52-63,12.基金项目
四川省科技计划资助(苗子项目)培育项目"智能钻头破岩模式识别与闭环控制应用技术研究"(项目编号MZGC20240054). （苗子项目）
