小口径随钻测量系统密封结构设计及测试
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摘要
随钻测量系统(MWD)多在高温、高压、强振动的工况条件下使用,而传统的O型圈密封结构在这种情况下容易发生泄漏。针对3 000 m井底使用的小口径随钻测量系统密封结构的要求,提出一种基于O型圈的锥面密封结构,该密封结构采用端面密封作为初级密封,采用多道O型圈锥面密封密封(加挡圈)作为二级密封,采用粗牙螺纹并缠绕生胶带作为三级密封。设计的密封结构在钻探现场进行多次反复试验,结果显示该密封结构可在孔底连续工作20 h而不发生泄漏,满足实际项目中的使用要求。
The system of measurement while drilling( MWD is usually used in the condition of high temperature,high pressure and strong vibration,while the traditional sealing structure of O-rings may cause leakage easily in those working condition.According to the sealing demand of the sealing structure of small MWD used at the well bottom of 3 000 m,a new conical sealing structure based on the O-rings was designed.The sealing structure adopts the end face seal as the first seal,the O-rings and the conical sealing as the second seal and the thread sealed as the third seal.The designed sealing structure was tested many times at drilling field.The result indicates that the sealing structure can work safety more than 20 hours and it can meet the requires of real project.
The system of measurement while drilling( MWD is usually used in the condition of high temperature,high pressure and strong vibration,while the traditional sealing structure of O-rings may cause leakage easily in those working condition.According to the sealing demand of the sealing structure of small MWD used at the well bottom of 3 000 m,a new conical sealing structure based on the O-rings was designed.The sealing structure adopts the end face seal as the first seal,the O-rings and the conical sealing as the second seal and the thread sealed as the third seal.The designed sealing structure was tested many times at drilling field.The result indicates that the sealing structure can work safety more than 20 hours and it can meet the requires of real project.
引文
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[5]肖守金.深孔电磁波随钻测量钻具结构及其配套模拟装置研究[D].武汉:中国地质大学工程学院,2013.
[6]张毅,张晓东,张明,等.井下工具旋转动密封研究现状及发展趋势[J].钻采工艺,2014,37(6):75-77.Zhang Yi,Zhang Xiaodong,Zhang Ming,et al.Research present situation and development trend of ultra-deep rotary dynamic sealing tool[J].Drilling&Production Technology,2014,37(6):75-77.
[7]魏秦文,朱鑫,梁政,等.智能钻柱关键密封技术研究[J].石油钻采工艺,2014,36(6):105-108.Wei Qinwen,Zhu Xin,Liang Zheng,et al.Research on key sealing technique for intelligent drill string[J].Oil Drilling&Production Technology,2014,36(6):105-108.
[8]孙赫,张秋翔,蔡纪宁,等.端面周向波度密封中流场的数值模拟[J].润滑与密封,2011,36(5):63-67.Sun He,Zhang Qiuxiang,Cai Jining,et al.Numerical simulation of flow field in end face seal with circumferential waviness[J].Lubrication Engineering,2011,36(5):63-67.