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外压与弯矩组合载荷作用下筛管压溃载荷计算
付光明1,2,彭玉丹1,2,孙宝江1,2,郭永宾3,高永海1,2,蓝祖平4,金学义5
(1.非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛 266580;2.中国石油大学(华东)石油工程学院,山东青岛 266580;3.中海石油(中国)有限公司湛江分公司,广东湛江 524057;4.海洋石油工程(青岛)有限公司,山东青岛 266520;5.中海油田服务股份有限公司,河北三河 065201)
摘要:
筛管在服役过程中受出砂、地层运动等导致的外压和弯曲等复杂载荷影响,易发生压溃失效问题。利用ABAQUS软件建立考虑初始椭圆度的平行布孔筛管的有限元模型,研究外压和弯矩组合载荷作用下筛管的压溃行为。基于不同径厚比、布孔参数、弯矩载荷下筛管压溃载荷计算数值模拟结果,建立弯曲和外压组合载荷下筛管压溃载荷简化公式。结果表明:在纯弯矩载荷作用下,筛管的孔眼处易发生受应力集中现象,进而导致塑性变形失效;外压和弯矩组合载荷作用条件下,当弯矩载荷沿着椭圆截面的短轴加载时,筛管压溃载荷随着转角的增大而减小;弯矩载荷沿着椭圆的长轴加载时,筛管压溃载荷存在峰值,随着载荷继续增加,筛管的后压溃变形形态会发生转变;外压和弯矩组合载荷作用下筛管压溃载荷公式计算结果与有限元结果的平均误差小于2.7%。
关键词:  防砂筛管  有限元模型  组合载荷  压溃载荷
DOI:10.3969/j.issn.1673-5005.2021.02.009
分类号::TE 257
文献标识码:A
基金项目:
Collapse pressure calculation of sand control screen tube under combined external pressure and bending
FU Guangming1,2, PENG Yudan1,2, SUN Baojiang1,2, GUO Yongbin3, GAO Yonghai1,2, LAN Zuping4, JIN Xueyi5
(1.Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;3.Zhanjiang Branch, CNOOC China Limited, Zhanjiang 524057, China;4.Offshore Oil Engineering (Qingdao) Company Limited, Qingdao 266520, China;5.China Oilfield Services Company Limited, Sanhe 065201, China)
Abstract:
The collapse failure of the sand control screen tube subjected to combined external pressure and bending load has become a major concern in oil and gas production wells. In this study, a finite element model of the screen tube with an initial ovality was developed using the ABAQUS software, and its collapsing behavior under combined external pressure and bending was studied. Based on the numerical simulation results of the collapse pressure under different radius-thickness ratio, the hole parameters of the screen tube, a simplified formula for calculating the collapse pressure of the screen tube under combined bending and external pressure was established. The results show that, under pure bending load, aplastic deformation of the screen occurs firstly at near the screen holes. Under combined fluid pressure and bending, when the bend loading direction is along the minor axis of the oval tube cross-section, the collapse pressure on the screen decreases with the increase of the bending load. The higher of the tube ovality, the smaller the collapse pressure of the screen tube can be observed. When the bend loading direction is along the major axis of the oval tube cross-section, and with the increasing of the bending, a peak value of the collapse pressure can be obtained. The average difference between the calculated results with formula and that obtained using the finite element method is less than 2.7%.
Key words:  sand control screen  finite element model  combined load  collapse strength
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