摘要
热采水平井中套管柱受各种载荷耦合作用会产生应力集中而损坏。为此,采用有限元方法对热采水平井弯曲段套管柱失效载荷进行了分析。在建立套管柱受力等效模型和有限元计算模型之后,分析研究了多种载荷耦合作用下套管柱失效的临界应力和临界应变。研究结果表明,套管柱应力值和应变随着地层深度的增加和注汽温度的升高而增大,对于井眼弯曲段套管柱,井眼曲率越大,管柱应力值和应变越大。建议进行热采水平井套管柱设计时采用高强度管材,以提高材料屈服极限,减小轴向应变。
There will occur the stress concentration and subsequent damage with casing string of thermal recovery horizontal well due to the coupling effect of various loads. Therefore, the finite element method was adopted to analyze the failure load of casing string in the bending section of thermal recovery horizontal well. After establishment of casing string force equivalent model and finite element calculation model, the critical stress and critical strain of casing string failure under the effect of various loads were analyzed and studied. The research findings show that the stress value and strain of casing string will increase with the increase of formation depth and steam injection temperature. As far as the casing string in the hole bending section is concerned, the greater the hole curvature, the larger the string stress value and strain. It is suggested that in design of thermal recovery well casing string, highstrength pipes should be used in order to improve the yield limit of material and reduce axial strain.
出处
《石油机械》
北大核心
2013年第7期74-77,81,共5页
China Petroleum Machinery
关键词
热采井
水平井
套管柱
耦合作用
失效
临界载荷
温度效应
应变分析
thermal recovery well
horizontal well
Casing string
coupling effect
failure
critical load
temperature effect
strain analysis
