带封隔器的注泡沫管柱受力分析及强度校核  

Stress Analysis and Strength Check on Injecting Foam Tube with Packer

作　　者：龚迪光[1] 曲占庆[1] 郭天魁[1] 宋彦男 田雨[1] 

机构地区：[1]中国石油大学(华东),青岛266580

出　　处：《科学技术与工程》2015年第7期65-69,共5页Science Technology and Engineering

基　　金：国家重大专项(2011ZX05051)资助

摘　　要：采用聚合物强化泡沫驱油时,井口压力的大小会影响管内流体压力分布,进而影响管柱受力情况。分析不同井口压力下管柱三轴受力情况,对管柱进行强度校核,可以避免压力过大而破坏管柱和引发事故。当前还没有一套比较完整的带封隔器注泡沫管柱受力分析和强度校核的数学模型。在质量、能量和动量守恒定律的基础上,考虑泡沫流体压力、温度和密度的相互关系和封隔器上下不同受力规律,建立了管柱受力模型,对管柱进行了三轴应力强度校核。实例井检验结果表明:随井深增加,管柱所受泡沫流体的内压力增大;且井深越大,趋势越明显;随井口压力的增大,管柱内压力、封隔器以下外挤力相应增大,管柱三轴抗外挤强度减小,其他受力和强度值变化较小。此模型还可以对不同泡沫质量、泡沫种类及钢级等情况下的管柱进行受力分析和校核,为油田管柱的优选提供理论指导。The wellhead pressure has an influence not only on the pressure distribution of fluid along the pipe string, but also on the force of pipe string when foam polymer is injected for flooding the oil. If the triaxial stress conditions in different wellhead pressure and strength check are analyzed, it will be help for the production in the feld. However, there haven＇ t been a set of systemic mathematical model about injected foam for carrying out the force analysis and intensity check along the pipe string with packers. Based on the law of conservation of mass, energy and momentum, the interrelation of the foam fluid pressure, temperature, density and the different mechanical law of upper and lower packer are considered. Finally, the mechanical model of pipe string is developed. The field well examination shows that, the internal pressure along the pipe string increases and the increasing rate gets larger as the well depth increases;as the wellhead pressure increases, the internal pressure along pipe string, the external squeeze pressure below packer increase and the pipe string triaxial collapse resistance decreases, some other forces and intensity values are smaller changed simultaneously. The model can also be used to do force analysis, check the pipe string in different foam quality, type and steel grade, and provide theoretical guidance for optimization of oilfield pipe string.

关 键 词：受力分析 强度校核 泡沫流体 管柱 井口压力 封隔器 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]