【作者】 赵欣欣； 闫相桢； 蔡德军； 姜志晨； 尹法领； 张恒通；

【Author】 ZHAO Xin-xin;YAN Xiang-zhen;CAI De-jun;JIANG Zhi-chen;YIN Fa-ling;ZHANG Heng-tong;Key Laboratory of Unconventional Oil & Gas Development(China University of Petroleum (East China)),Ministry of Education;Drilling Department,CNPC Offshore Engineering Company Limited;

【机构】 非常规油气开发教育部重点实验室(中国石油大学(华东))； 中国石油集团海洋工程有限公司钻井事业部；

【摘要】 石油工程尤其是钻井工程中用到的钻井液、水泥浆等流体主要为屈服幂律流体,分析气泡在屈服幂律流体中的碰并与运移有助于研究钻井过程中侵入气体运动和发展过程。本文建立了双气泡在屈服幂律流体中数值模型,分析了气泡及其周围液相压力场和速度场的分布特征,并讨论了流体静切力、稠度系数、流性指数对气泡碰并过程和运移速度的影响规律。模拟结果表明,在做模拟的同等气泡直径和间距条件下,纵向分布的双气泡在水中螺旋式上升、脉动较为强烈并在一定时间后碰并,幂律流体中气泡直线上升,由于屈服幂律流体的剪切稀释特性,碰并时间较短,屈服幂律流体中表观黏度较低时具有追赶效应但不易碰并,黏度较高时气泡之间的影响很小,不易靠近和碰并。更多还原

【Abstract】 The drilling fluid and cement slurry used in petroleum engineering,especially in drilling engineering,are mainly yielding power law fluid.Analyzing the collision and migration of bubbles in yielding power law fluid is helpful to study the intruding gas movement and development process during drilling.In this paper,a numerical model of double bubbles in yielding power law fluid is established.The distribution characteristics of pressure field and velocity field in liquid phase around the bubble are analyzed,and the effects of static shear force,consistency coefficient and fluid index on the process and velocity of bubble coalescence are discussed.The simulation results show that under the conditions of the same bubble diameter and spacing of the simulation,the longitudinally distributed double bubbles spirally rise in the water and the pulsation is relatively strong.They collide and merge after a certain time.The bubbles in the power law fluid rise linearly.Due to the shear-dilution characteristic of the power law fluid,the collision time is shorter.The apparent viscosity of the yielding power law fluid has a catch-up effect when the apparent viscosity is low,but it is not easy to collide.When the viscosity is high,the influence between the bubbles is small,and it is not easy to approach and collide.更多还原