摘要
油管传输式射孔管柱下放过程中会形成激动压力直接影响点火头的安全性,严重的可能导致点火头提前击发,发生误射孔事故。基于哈根-泊肃叶流理论,研究了油管传输射孔作业中管柱下放时的井筒内压力场,建立了数学模型。以特定结构的管柱为算例,分析了管柱下放时,点火头所受波动压力与管串各段器材直径及下放速度之间的关系。研究结果表明,管柱下放速度越大,管柱外径越大,封隔器以下的"憋压"效应越大;在未出现明显"憋压"效应时,点火头压主要取决于井液的静水压力。此方法可预先计算油管传输式射孔管柱下放过程中的激动压力,为后续射孔施工方案编制安全压力值的设计和现场施工操作防范措施的制定提供科学的依据。
The surging pressure of the wellbore will be formed during the downing of the TCP string,which directly affects the safety of the ignition head.Seriously,the ignition head may be fired in advance,and a false perforation accident may occur.Based on the Hagen-Poisenille flow theory,a mathematical model of the pressure distribution along the wellbore is established,and the pressure field in the wellbore when downing the TCP pipe string is studied.In addition,taking the string of a specific structure as an example,this paper analyzes the relationship between the surging pressure of the ignition head and the diameter as well as the running speed of the various sections of the string.The results show that the greater the running speed and the outer diameter of the pipe string,the greater the“shutoff pressure”effect below the packer;and when there is no obvious“shutoff pressure”effect,the ignition head pressure mainly depends on the hydrostatic pressure of liquid in the wellbore.This method can pre-calculate the surging pressure during the process of setting down the TCP pipe string,provide a scientific basis for the design of the safety pressure value in the subsequent perforation construction plan and the precaution in the on-site construction operation.
作者
于秋来
YU Qiulai(Well Testing Company of PetroChina Daqing Oilfield Company Limited,Daqing,Heilongjiang 163412,China)
出处
《油气井测试》
2018年第5期7-12,共6页
Well Testing
基金
大庆油田重大科技专项"深井
超深井管输射孔管柱优化设计及配套技术研究"(DQP-2013-CS-KY-001)
