气体钻井空井压井井筒气液两相瞬态流动数学模型

发布时间：2018-10-19 08:09

【摘要】：气体钻井钻遇高压、高产气层后往往要进行压井作业,空井压井期间,随着压井液的注入,井筒环空气液两相流动与地层渗流产气发生耦合作用,目前国内外对此研究都很少。为此,基于地层瞬态渗流理论和井筒气液两相流动理论,建立了气体钻井空井压井过程中地层瞬态产气与井筒气液两相瞬态耦合流动数学模型及其数值求解方法。实例模拟计算结果表明:(1)气体钻井空井压井是由气相空井筒—瞬态气液两相流动—纯压井液井筒的物理过程,同时也是一个地层瞬态渗流与井筒气液两相瞬态流动耦合的过程;(2)成功的压井作业需要井口回压、泵排量、压井液密度等关键参数的共同配合,其中控制好井口回压是保证压井作业获得成功的关键。结论认为,研究成果首次量化了气体钻井压井过程,对气体钻井空井压井施工参数的优化设计具有指导意义。
[Abstract]:When gas drilling meets high pressure, it is often necessary to kill well after high production gas formation. During the period of hole killing, with the injection of well killing fluid, the coupling effect between the two phase flow of air fluid in wellbore ring and formation percolation and gas production occurs. At present, there is little research on this at home and abroad. Based on formation transient percolation theory and wellbore gas-liquid two-phase flow theory, a mathematical model of formation transient gas-liquid two-phase coupled flow and its numerical solution are established. The results of simulation and calculation show that: (1) the dead hole in gas drilling is a physical process from the gas borehole to transient gas-liquid two-phase flow-pure fluid wellbore. At the same time, it is also a coupling process of formation transient percolation and gas-liquid two-phase transient flow in wellbore. (2) successful well killing requires the cooperation of key parameters such as wellhead back pressure, pump displacement, fluid density, etc. Controlling well head back pressure is the key to the success of well-killing operation. It is concluded that the research results quantify the process of gas drilling and kill for the first time, which is of great significance to the optimization design of the parameters of gas drilling.
【作者单位】： "油气藏地质及开发工程"国家重点实验室·西南石油大学;中国石油西南油气田公司勘探事业部;中石化西南石油工程有限公司井下作业分公司;
【基金】：国家重点研发计划项目(编号:2016YFC0304008) “油气藏地质及开发工程”国家重点实验室开放基金项目(编号:PLN1309,PLN1418) 国家自然科学基金项目(编号:51204140,51334003)
【分类号】：TE242

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