摘要
用弹塑性有限元法建立了套管偏梯形和圆形螺纹接头接触问题的有限元力学模型。对套管偏梯形螺纹接头 ,得出牙侧角为 3、 5和 10°时滑脱载荷随加载过程的变化曲线 ;对于套管圆形螺纹接头 ,得出锥度为 、 和 时滑脱载荷随加载过程的变化曲线。对套管偏梯形螺纹和圆形螺纹滑脱过程的对比分析表明 ,偏梯形螺纹的平均滑脱载荷为 5 82 6kN ,圆形螺纹的平均滑脱载荷为 335 9kN ,即在同样套管和接箍结构尺寸下 ,偏梯形螺纹不易产生滑脱 ,而圆形螺纹容易产生滑脱。研究结果在深井、超深井和苛刻的复杂井套管柱设计中 ,为套管接头螺纹的选择提供了理论数据。
The finite element models for contact problems of connectors of buttress and round threads of casing are established with the elasto-plastic FEM. Under the three flank angles 3°, 5° and 10° for the buttress casing connector, the curves that the jump-out loads varied with the loading process are obtained. With the three tapers 1/14, 1/16 and 1/17 for the round casing connector, the curves that the jump-out loads varied with the loading process are obtained. In addition, the jump-out process of the buttress and round thread connector is investigated respectively. And the result shows that the average jump-out forces of the buttress connector and round connector are 5 826 kN and 3 359 kN respectively. This means the buttress thread connector is not apt to jump out, while the round thread connector is easy to jump out with the same sizes of casing and collars. It provides a theoretical support for the selection of the thread connectors of the casing for ultradeep wells and complex wells.
出处
《石油机械》
北大核心
2004年第5期7-9,49,共4页
China Petroleum Machinery
基金
国家自然科学基金 (批准号 50074025)
上海宝钢股份公司 (编K0 2DSMA2 60 )
四川省青年科技基金资助 (项目编号:0 3ZQ026-044)
关键词
套管
偏梯形螺纹
弹塑性
接箍结构
连接强度
接箍机
casing, buttress thread, round thread,jump-out load, elasto-plastic, finite element analysis
