振动采气管柱应力强度分析  

An Analysis of the Stress Strength of Vibration Gas Recovery Pipestring

作　　者：曹银萍[1] 唐庚[2] 唐纯洁[3] 郭建华[2] 

机构地区：[1]西安石油大学机械工程学院 [2]西南油气田分公司采气工程研究院 [3]西南油气田分公司天然气研究院

出　　处：《石油机械》2012年第3期80-82,共3页China Petroleum Machinery

基　　金：国家科技重大专项"塔里木盆地库车前陆盆地油气勘探示范工程--超深超高压高温油气井试油完井及储层改造配套技术"(2008ZX5046-04);中石油科技攻关重大专项"塔里木油田勘探开发关键技术研究"(2010E-2105)

摘　　要：为了给采气管柱疲劳寿命分析和完整性分析提供依据,考虑管柱自重及内、外压沿深度的线性变化,用有限元软件分析振动采气管柱的应力强度。将采气管柱看作是内空的细长杆,用有限元法对管柱进行离散化处理,再用拉格朗日方程得到采气管柱动力学微分方程。采用二维轴对称模型进行建模,采用4节点平面单元Plane42进行分析。分析结果表明,采用ANSYS中轴对称单元Plane42建立采气管柱有限元模型,进行振动采气管柱的应力强度分析是一种有效的方法;井口管柱应力最大,是应力危险点;振动载荷作用下,管柱内壁所受应力大于外壁所受应力。To provide the basis for the fatigue life analysis and completeness analysis of gas recovery pipestring, the finite element software was used to analyze the stress strength of vibration gas recovery pipestring considering the dead weight of the string as well as the linear change of internal and external pressures along the depth. Regarding the string as the slender rod which is internally hollow, the finite element method was used to conduct a discretiza- tion treatment of the string. Then, the Lagrange equation was adopted to obtain the dynamic differential equation of the string. The two-dimensional axisymmetric model was adopted to conduct modeling and the four-node plane unit Plane42 was applied to conduct an analysis. The analysis shows that it is an effective method to adopt the axisym- metric unit Plane42 of the ANSYS software to establish the finite element model of the gas recovery string and to make a stress strength analysis of the string. The maximum stress is with the wellhead string, which is the danger- ous point of stress. The stress of the inner wall of the string is greater than that of the external wall under the effect of vibration load.

关 键 词：采气管柱 振动 应力强度 细长杆 强度分析 

分 类 号：TE931[石油与天然气工程—石油机械设备]