[1]王新虎,吕永鹏,王建东,等.油井管接头密封方法及机理综述[J].石油管材与仪器,2020,6(01):6-10.[doi:10.19459/j.cnki.61-1500/te.2020.01.002]
 WANG Xinhu,LYU Yongpeng,WANG Jiandong,et al.Review on the Thread Connection Seal Method and Mechanism of Oil Country Tubular Goods[J].Petroleum Tubular Goods & Instruments,2020,6(01):6-10.[doi:10.19459/j.cnki.61-1500/te.2020.01.002]
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油井管接头密封方法及机理综述
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《石油管材与仪器》[ISSN:2096-0077/CN:61-1500/TE]

卷:
6
期数:
2020年01期
页码:
6-10
栏目:
综述
出版日期:
2020-02-25

文章信息/Info

Title:
Review on the Thread Connection Seal Method and Mechanism of Oil Country Tubular Goods
文章编号:
2096-0077(2020)01--0006-05
作者:
王新虎1吕永鹏23王建东1潘宝昌3冯耀荣1
1.石油管材及装备材料服役行为与结构安全国家重点实验室,中国石油集团石油管工程技术研究院 陕西 西安 710077;2.西安石油大学 陕西 西安 710065; 3.宝鸡石油钢管有限责任公司 陕西 宝鸡 721008
Author(s):
WANG Xinhu1 LYU Yongpeng23 WANG Jiandong1 PAN Baochang3 FENG Yaorong1
1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi′an, Shaanxi 710077, China; 2. Xi′an Shiyou University, Xi′an, Shaanxi 710065, China; 3. Baoji Petroleum Steel Pipe Co.Ltd., Baoji, Shaanxi 721008, China
关键词:
油井管螺纹密封机理
Keywords:
oil country tubular goods thread connection seal mechanism
分类号:
TE931
DOI:
10.19459/j.cnki.61-1500/te.2020.01.002
文献标志码:
A
摘要:
高温高压天然气井的管柱密封性至今无法完全保障。油井管最常用的四种密封方法是螺纹密封、台肩密封、弹性密封环密封和金属接触密封。大部分特殊螺纹接头采用金属接触密封,密封面接触压力决定了密封能力。正确的金属接触密封会显示出一种压力激发效应。将密封面设计在远离螺纹端部的位置,螺纹端部刚性增强了密封接触力。金属接触密封的泄漏概率为10-2,泄漏速度取决于密封面的接触应力宽度、粗糙度、损伤程度、密封脂、涂层等。特殊螺纹接头在振动后,即使产生疲劳裂纹,也不发生泄漏。一些接头台肩刻槽后作密封性试验,结果发生泄漏。很多气井管柱扭矩台肩发生了腐蚀,证明金属接触密封存在泄漏通道,即扭矩台肩起密封作用。接触压应力设计法无法完全解决特殊螺纹接头的密封问题,发展全新的设计理论和制造技术,是保障特殊螺纹接头密封性的重要发展方向。
Abstract:
Seal integrity of tubular string in HTHP well has not been well guaranteed. Four kinds of seal system for oil country tubular goods (OCTG) are thread seal, shoulder seal, resilient seal and radial metal contact seal. Most gas tight premium connections utilize radial metal seal, and the seal contact pressure in excess of the expected well pressure determines the sealing performance of the connection. A properly designed metaltometal radial seal exhibits a pressure energization effect. An innovative feature can amplify the seal contact force using the stiffness of the pin extension, instead of using the reaction force provided by the negative shoulder angle. The leak probability of metal gas seal is 10-2. the leak rate dependents on the effective width of the contact stress band, surface roughness, surface damage, sealing compound and the type of coating. Leakage did not occurred even fatigue cracks appeared in the premium connections due to vibration. Some premium connections leaked after the shoulders were notched. Shoulders of many tube strings in HTHP well have been corroded, which proves that the radial metal seal surface has leakage path, and the shoulder plays seal role actually. It is concluded that the contact stress design method can not resolve the seal ability of premium connections thoroughly. Other design and manufacture methods should be innovated.

参考文献/References:

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备注/Memo

备注/Memo:
基金项目:中国石油天然气集团公司基础研究和战略储备技术研究基金项目“高温高压气井油井管失效控制新理论研究”(项目编号:2017Z03) 第一作者简介:王新虎,男,1962年生,教授级高级工程师,1989年毕业于西北工业大学金属材料专业,获工学硕士学位,现在主要从事油井管失效分析与科技研究工作。E-mail:wangxinhu002@cnpc.com.cn
更新日期/Last Update: 2020-02-25