基于特征值和弧长法计算套管抗挤强度  

Calculation of Casing Collapse Resistance Based on Eigenvalue and Arc Length Method

作　　者：张旭 张哲平 杨尚谕 王雪刚 宋琳[4] ZHANG Xu;ZHANG Zheping;YANG Shangyu;WANG Xuegang;SONG Lin(Tianjin Pipe Corporation,Tianjin 300301,China;CNPC Tubular Goods Research Institute,Xi'an,Shaarnxi 710077,China;State Key Laboratory for Peformance and Structure Safey of Petroleum Tubular Goods and Equipment Materials,Xi'an,Shaanxi 710077,China;Enginering Technology Research Instiute,PetroChina Xinjiang oilfield Company,Karamay,Xingjiang 834000,China)

机构地区：[1]天津钢管制造有限公司 [2]中国石油集团工程材料研究院有限公司 [3]石油管材及装备材料服役行为与结构安全国家重点实验室 [4]中国石油新疆油田公司工程技术研究院

出　　处：《钻采工艺》2022年第1期35-40,共6页Drilling & Production Technology

基　　金：天津钢管制造有限公司项目“超深高温高压油气井用非API套管的研究”(编号:22DJ005)。

摘　　要：文章基于ABAQUS软件特征值和弧长法研究套管可承受的外挤临界值。ABAQUS特征值用于确定套管弹性挤毁的外挤临界值;而弧长法克服了Newton-Raphson方法极值点发散、无法跟踪极值点以后的位移—载荷路径的缺点,全程跟踪后屈曲载荷位移路径,并给出准确的外挤临界解值。通过弧长法分析还发现弯曲度对套管抗挤毁能力产生的影响较为显著,随着弯曲度增大,套管抗挤毁能力逐渐降低;随着缺欠模态的增加套管的抗挤毁性能也逐渐降低。文章以TP140V钢级不同规格的套管做模型,在单轴载荷条件下得到套管极限挤毁值,结果表明:有限元计算套管挤毁值与实物试验检测值基本一致,误差在3%左右,且模拟的挤毁形貌与实物挤毁形貌相同。随着国内非标管材用量不断增加,对于受压溃设备能力限制而无法获得极限挤毁值的套管,该方法具有借鉴和参考意义,并且相较于API5C3算法,弧长法具有计算准确及适用产品范围广特点。Based on ABAQUS software eigenvalue and Arc length method, the critical value of casing extrusion is studied. The ABAQUS software eigenvalue is used to determine the external squeeze critical value of casing elastic squeeze. However, by overcoming the shortcomings of Newton-Raphson method such as divergence of extreme points and inability to track the displacement-load path after the extreme points, the Arc length method can track the displacement path of post-buckling load in the whole process and give an accurate solution. It is found that the bending degree has a significant impact on the collapse resistance of casing. With the increase of bending degree, the collapse resistance of casing decreases gradually. With the increase of missing modes, the anti-collapse performance of casing also decreases gradually. Taking TP140 V steel casing with different dimensions as an example, the casing ultimate collapse value is calculated under uniaxial load. The results show that the casing collapse value calculated by finite element method is consistent with the actual test value, the error is about 3%, the collapse morphology is the same as the actual collapse morphology. With the increasing consumption of non-standard pipes in China, this method has reference significance for casing with limited capacity of pressure equipment and unable to obtain the limit collapse value. Compared with API15 C3 algorithm, Arc length method has the characteristics of accurate calculation.

关 键 词：ABAQUS软件 特征值 弧长法 套管极限挤毁值 弯曲度 缺欠模态 套管选型 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]