分支井采油管柱激振力分析  

EXCITING FORCE ANALYSIS OF OIL WELLS STRING IN MULTI-LATERAL WELL

作　　者：孙健[1] 杨兆中[1] 梁海波[1] 吴娟[2] 

机构地区：[1]西南石油大学 [2]西南油气田分公司勘探开发研究院

出　　处：《钻采工艺》2010年第4期67-70,共4页Drilling & Production Technology

基　　金：国家自然科学基金项目资助;项目编号:50604022

摘　　要：采油过程中,油管柱始终处在一个复杂的动力环境之中,承受多种力的激励和响应,从而导致油管柱结构的损坏或加剧油管柱的破坏。而分支井采油机理更为复杂,上部井下控制阀产生的汇流处,是油管柱振动研究中一个新的振源,而油管柱的振动将引起井内流体的压力波动。正确认识分支井汇流引起的管柱振动规律,为避免发生井下油管事故有着重要的意义。基于流体力学理论,采用有限元分析方法,利用通用大型流体力学软件Fluent,建立了分支井采油管柱汇流力学模型,分析了汇流流场的流动状态以及汇流对采油管柱造成的流体激振力。揭示了分支井汇流处管内管外的压力差与井下控制阀进液孔处动压力的关系。为分支井采油管柱的优化设计提供了理论依据。In oil recovery process,the oil string is always in a complex dynamic environment to withstand a variety of incentives and response,resulting in structural damage of the tubing string. The oil recovery mechanism of multi-lateral wells are more complex,a new vibration produced by the confluence in the upper downhole control valve caused the oil wells fluid pressure fluctuation. Correctly under-standing the pipe string vibration law produced by the confluence has an important significance for avoiding downhole pipeline accident. Based on fluid mechanics theory,the confluence mechanical model of multi-lateral wells was established by using finite element analy-sis method and fluid dynamics software Fluent. The flow condition of flow convergence field and fluid exciting force to tubing string were analyzed. Meanwhile the relationship of pressure difference between inside and outside string and dynamic pressure in downhole control valve was analyzed. It provided a theoretical basis for optimal design of production string.

关 键 词：油管柱 有限元分析 FLUENT 分支井采油 优化设计 

分 类 号：TE355.6[石油与天然气工程—油气田开发工程]