摘要
文章将油管和环空视为“U”型管,根据下油管过程中和接单根时管内外流体的流动规律,应用流体力学基本理论,对完井下油管过程中管内喷完井液的原因进行了理论分析,推导了管内外液面高度差的计算公式。并结合两相流动理论,分析了管内外天然气的滑脱速度差异、流型转变差异。认为完井下油管过程中管内喷完并液的主要原因是:①下油管时管内外形成的液面差加速了天然气溢流进入管内;②管内天然气溢流膨胀比在环空快;③管内天然气滑脱上升比环空易形成气柱。同时,文中还介绍了气侵的原因及方式,并提出了预防和处理管内喷完井液的一些建设性措施。
Supposing tubing and annular as 'U' Tube,according to the flowing laws of the fluids inside and outside tubing during making up a joint,the causes of completion fluid blowout from tubing are theoretically analysed and the compulation formula of level difference between inside and outside the tubing are derived by the basic theory of fluid mechanics.Combining tow-phase flow theory,the difference of gas slip velocities between inside and outsite the pipe and that between flow pattern transferences are analysed. The main causes of completion fluid blowout from tubing during runing are considered that:①the liquid level difference formed outside and inside pipe accelerates gas spill to enter into the tubing ;②the expansion of the gas spill in the pipe is faster than in the annular space ;③the gas slips and raises to form gas column in the tubing is easier than in the annular space.The causes and method of gas cutting are also introduced. some good measures of preventing and treating the completion fluid blowout are proposed out.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1995年第4期37-40,共4页
Natural Gas Industry
关键词
完井
油管
完井液
井喷
Well completion
Tubing
Completion fluids
Flowing in tubing
Blowout
Analysis.