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双台肩钻杆接头副台肩间隙的优选

ISSN号：1000-4750
期刊名称：工程力学
时间：2013.6.15
页码：353-357
分类：TD41[矿业工程—矿山机电]
作者机构：[1]上海大学,上海市应用数学和力学研究所,上海市力学在能源工程中的应用重点实验室,上海200072, [2]中国石油塔里木油田分公司,新疆库尔勒841000, [3]上海海隆石油管材研究所,上海200949
相关基金：国家自然科学基金项目（51174130,50674065）; 上海市重点学科建设项目（S30106）; 上海市教委科研创新项目（11CXY32）; 上海领军人才基金项目; 上海市科学技术委员会优秀学术带头人项目（12XD1402500）; 上海市部分地方院校能力建设项目（12160500200）
相关项目：深井、超深井钻柱的非线性动力学特性分析

关键词：双台肩钻杆接头, 副台肩间隙, 接触压力, 应力分布, 螺纹, double shoulder drill pipe joint, the clearance of secondary shoulder, contact pressure, stress, distribution, threads

中文摘要：

随着钻井深度的不断增加,双台肩钻杆得到了越来越多的应用。双台肩钻杆接头相比API标准钻杆接头最重要的特征在于增加了一个副台肩,其通过提供额外的载荷承载面和上扣定位来为钻杆接头带来更高的扭矩承载能力和更好的密封性能,从而保证钻杆接头的使用性能。根据双台肩钻杆接头的受力特点,副台肩处应该留一定量的初始间隙。副台肩处的间隙量决定了副台肩的承载比例,从而影响接头的应力分布。研究表明：副台肩间隙过小将加重公扣小端几牙螺纹的承载,同时也容易造成副台肩处的损伤;而副台肩间隙过大将加重公扣大端几牙螺纹的承载,同时也使得副台肩的作用不能得以充分的发挥,进而加重主台肩的负担。合理的副台肩间隙有利于改善接头的应力状态,提高接头的使用性能。

英文摘要：

The double shoulder drill pipe has been widely used with the increase of well depth. Compared with a standard API drill pipe joint, a secondary shoulder is a significant feature of a double shoulder drill pipe joint, which offers an additional loading surface and mechanical stop to ensure the high torque resistance and good seal performance of a joint. According to the mechanical characteristics of a double shoulder drill pipe joint, a suitable clearance should be obligated in front of a secondary shoulder. The magnitude of the clearance determines the loading ratio of a secondary shoulder, which affects the stress distribution of a joint. The results show that the threads near a secondary shoulder will bear more stress and the failure risk of a secondary shoulder is increased when the clearance is small. However, when the clearance is large, the primary shoulder and the threads near a primary shoulder bear more loads. A suitable clearance of a secondary shoulder can improve the performance of a joint by optimizing its stress distribution.

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