考虑地震力的深水导管与海底土纵向耦合振动研究  

Study on the Longitudinal Coupled Vibration of Deepwater Pipe and Seafloor Soil Considering Seismic Force

作　　者：陶磊[1] 赵虹宇[1] 邓嵩[1] 朱硕 耿浩然[1] 王相[1] 纪梦楠 TAO Lei;ZHAO Hongyu;DENG Song;ZHU Shuo;GENG Haoran;WANG Xiang;JI Mengnan(Changzhou University)

机构地区：[1]常州大学

出　　处：《油气田地面工程》2019年第2期15-21,共7页Oil-Gas Field Surface Engineering

基　　金：江苏省自然科学基金(BK20180959);国家自然科学基金(51574261);江苏省高等学校自然科学研究项目(17KJB440001)资助

摘　　要：为对深水油气钻采过程中隔水管、水下井口等管柱设备的稳定性研究提供理论支撑,基于桩基力学和流体力学,建立了考虑地震力的深水水下井口-导管与海底土纵向耦合振动模型。假设深水导管周围的土层是均匀的,且是各向同性的饱和黏性土壤,海底地震力是简谐力,并施加在土层的底部,模型考虑了环空钻井流体上返摩擦力,并引入势函数对模型进行求解。将计算结果与ABAQUS模拟结果对比,同时进行了影响因素分析。研究结果表明,采用此模型计算结果准确度较高,深水导管纵向振动主要影响因素是地震频率和导管下入深度,而环空上返流体对系统纵向振动影响较小,在深水油气钻采过程中应注意预防地震灾害,并合理设计导管下深。In order to provide theoretical support for the stability study of the pipe string equipment such as the riser and underwater wellhead in the process of oil and gas drilling and production,the deepwater underwater wellhead-pipe and seafloor soil longitudinal coupled vibration model based on pile foundation mechanics and fluid mechanics is established.We assume that soil layers around the pipe are homogeneous,isotropic and saturated cohesive soil,and seismic force is harmonic force,which is at the bottom of the soil layers.The model considers the return friction of annular drilling fluid,and the potential function model is introduced to solve results.The calculation results are compared with those simulated through ABAQUS,and influencing factors are analyzed.Study results show that using this model the calculation results will be more accurate.The seismic frequency and the depth of riser are the main factors of the longitudinal vibration of deepwater pipes,while the annular return liquid has little effect on the system vertical vibration.In the deepwater oil and gas drilling and production process,seismic prevention should be noted,and the depth of riser should be designed properly.

关 键 词：井口-导管 地震力 海底土 振动模型 

分 类 号：TE92[石油与天然气工程—石油机械设备]