【正文】
,以此評價接頭密封性能。結(jié)果顯示不合適的螺紋參數(shù)匹配將導(dǎo)致密封面在拉伸載荷作用下失去密封能力。摘要:對帶金屬對金屬密封結(jié)構(gòu)的特殊螺紋接頭來說,保證接頭的密封可靠性是很重要的。主要表現(xiàn)為:在密封試驗中,有的試樣通過了試驗,另有一些試樣卻未能通過試驗;檢測評價合格的特殊螺紋接頭,井下應(yīng)用一段時候后,仍然有泄漏發(fā)生。由于密封面長度有限,不是理想光滑,密封面上必須有一定的密封壓力,克服由于表面的凸凹不平,才能實現(xiàn)接頭的可靠密封。除上述材料、結(jié)構(gòu)與載荷參數(shù)外,密封面的光潔度及處理方法也是很重要的因素。目前有幾個大型有限元分析軟件都提供了數(shù)值分析目的參數(shù)概率分布的功能。5)利用蒙特卡羅方法進行模擬分析。有限元模型如圖4,在接箍中部施加對稱位移約束,在管體端部施加拉伸載荷。176。結(jié)果顯示,最大接觸壓力接近正態(tài)分布,密封接觸長度則基本穩(wěn)定在較大值。對于4000米的井深,約有400個接頭,1027,即肯定發(fā)生泄漏。參考文獻[1] Jun Takano, Masao Yamaguchi. Hidenori Kunishige. Development of Premium Connection “KSBEAR” for Withstanding High Compression. KAWASAKI STEEL TECHNICAL REPORT, No. 47 December 2002:1422[2] Eiji TSURU, Kunihiko OKAMURA, Yasushi TSUJANO,etc. Dopefree Type Premium Connection for Oil Country Tubular Goods. NIPPON STEEL TECHNICAL REPORT, 2000 january:6973[3] A. B. Bradley, S. Nagasaku, E. Verger. Premium Connection Design, Testing, and Installation for HPHT Sour Wells. Society of Petroleum Engineers. SPE High PressureHigh Temperature Sour Well Design Applied Technology Workshop held in The Woodlands, Texas, ., 1719 May 2005. SPE 97585[4] Kirk Hamilton, Brian Wagg, Tim Roth. Using Ultrasonic Techniques to Accurately Examine Seal Surface Contact Stress in Premium Connections[5]G. R. Murtagian, V. Fanelli, J. A. Villasante, etc. Sealability of Stationary MetaltoMetal S