【作者】 丁璐； 倪红坚； 王瑞和； 杜玉昆； 王勇；

【Author】 DING Lu;NI Hong-jian;WANG Rui-he;DU Yu-kun;WANG Yong;School of Petroleum Engineering,China University of Petroleum (East China);

【机构】 中国石油大学(华东)石油工程学院；

【摘要】 利用超临界二氧化碳开发油气藏资源极具潜力,不过许多基础问题仍有待研究,井底波动压力变化问题则是其中之一。基于超临界二氧化碳的物性,建立了物性控制方程、流动控制方程、瞬态控制方程,最终获得井底的热流固耦合瞬态波动压力模型。在关泵条件下,起下钻速度越大,井底波动压力越大。当起下钻速度为0.1～2.0m/s时,最大激动压力从0.13 MPa升到3.86 MPa,产生的最大抽汲压力从0.13 MPa升到1.83 MPa。与清水钻井对比发现,超临界二氧化碳钻井产生的波动压力偏低,有利于现场作业,可以适当加快起下钻速度,提高工作效率。更多还原

【Abstract】 There is great potential to develop oil and gas reservoirs by using supercritical carbon dioxide drilling.But many basic theoretical problems remain to be studied,such as the transient bottom hole pressure under supercritical carbon dioxide drilling condition.Based on the physical property of supercritical carbon dioxide,the physical property control equation,wellbore flow control equation and transient control equation have been established,then the heat-fluid-solid coupling transient surge and swab pressure model in bottom hole has been established.Under stopping the pump condition,the larger the trip speed,the greater the fluctuation range.When the trip speed is 0.1～2.0 m/s,the maximum surge pressure increases from 0.13 MPa to 3.86 MPa,and the maximum swab pressure increases from 0.13 MPa to 1.83 MPa.Compared with water drilling,it is found that surge and swab pressure of supercritical carbon dioxide drilling is low,which is conducive to the field operation,and can appropriately accelerate the drilling speed and improve the work efficiency.更多还原