井底气泡的形成过程及其平均初始直径计算  

Bubbles Formation from the Bottom Region of Borehole and Their Initial Average Diameter Calculation

作　　者：尹浚羽 蒋宏伟 李磊[1,2] 朱磊[1,2] 吴俊[3] 严伟[1,2] 蒋寒希 

机构地区：[1]中国石油集团钻井工程技术研究院,北京102206 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中国石油长庆油田公司采油五厂,榆林718600 [4]北京林业大学,北京100083

出　　处：《科学技术与工程》2014年第19期30-33,59,共5页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05021-006)资助

摘　　要：利用类比的方法对井底气泡的形成过程进行了分析研究。认为垂直井底的气泡形成过程中,气泡膨胀阶段与Kazakis微孔介质气泡形成实验相似;脱离阶段则与水平毛细管气泡脱离过程相同。利用包立炯实验数据对Kazakis微孔介质气泡初始平均直径半经验公式进行了倾角校正,结合井底气层的渗流规律得出了适合井底气泡初始平均直径计算的方法。进行了井底压差和岩石孔吼直径对气泡初始平均直径影响情况的实例分析,结果较为符合实际,能为井底多相流动的微观描述提供一定的依据。An analogy method is applied to study the process of bubble formation from the Bottom Region of Borehole.In the process,bubble expansion stage is similar to the Kazakis＇ s experiment of bubble formation on microporous media; and the detachment is same with bubble detachment from horizontal capillary.By using Bao Litong＇ s experiment data with regard to the influence of capillary inclination angle on initial average bubble diameter,the Kazakis＇ s calculation formula was modified for initial average diameter of bubbles on microporous media.Further,by combining gas seepage law at the bottom of well,the calculation method for initial average diameter of bubbles from the Bottom Region of Borehole was acquired.The case study with respect to the impact on the average initial bubble diameter caused by the variation of pore diameter of gas layer or bottomhole pressue shows relatively high compliance with the reality.And this paper hopes to provide a basis for microscopic description of the multiphase flow at the bottom of well.

关 键 词：气泡形成 微孔介质 井底气体渗流规律 气泡初始平均直径 孔吼直径 

分 类 号：TE21[石油与天然气工程—油气井工程]