环空气液两相流中气泡微观动态特征研究

项目名称： 环空气液两相流中气泡微观动态特征研究

项目编号： No.51274168

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 张杰

作者单位： 西南石油大学

项目金额： 80万元

中文摘要： 本项研究涉及的领域包括欠平衡钻井、控压钻井和井控（溢流关井、压井过程），是优化钻井和安全钻井的关键基础性研究方向之一。钻井过程中环空气泡的生成机理及动态特征、气泡的尺寸大小及形状特征、气泡的受力情况及运移规律、气泡之间及气泡与钻井液之间的互作用规律等都会影响环空压力分布，直接改变井底压力的动态特征，进而改变井底压力与地层压力之间的平衡关系，给优化钻井和安全钻井带来巨大挑战。本项目拟通过大量的实验研究和机理模拟对环空气液两相流中气泡的微观动态行为特征进行研究，并以控压钻井井底压力测量数据和井口控压数据为基础建立计算和预测环空压力动态变化规律的新型数学模型，拟解决当前对钻井环空气泡微观动态行为特征认识不清的科学问题，并在此基础上研究气泡微观动态行为特征对钻井环空压力场的影响规律，对钻井实时优化和安全控制具有重要学术理论价值和重大实际意义。

中文关键词： 两相流；气泡；微观；动态；环空压力

英文摘要： The research which related to the field of underbalanced drilling, managed pressure drilling and well control (overflow, the process of killing),is one of the key basic research to optimize the drilling and safe drilling. Formation mechanism and dynamic characteristics of bubbles in annulus、the size and shape characteristics of the bubble、the force of the bubbles and migration law、the interaction between the bubbles and the drilling fluid and the interaction between bubbles and so on will affect the pressure distribution of the annulus, directly change the dynamic characteristics of the bottom hole pressure, thereby change the balance between the bottom hole pressure and formation pressure. So it is a great challenge to optimize the drilling and safe drilling. The project intends to study the dynamic behavior characteristics of micro-bubbles in the annular gas liquid two-phase through a large number of experiments and mechanism of simulation and create a new mathematical model to calculate and predict the dynamic variation of the annular pressure by MPD bottom hole pressure measurement data and wellhead pressure control data. It will solve scientific issues of unclear understanding of the micro-dynamic behavior characteristics of the bubble in annulus while drilling and study the micro-bubble dynamic behavior ch

英文关键词： two-phase flow；gas bubble；microcrosmic；dynamic；anullar pressure