西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

钻井环空中赫巴流体内气泡的上升速度

尹浚羽1,2 *,周英操1,张辉2,蒋宏伟1,朱磊1,   

  1. 1. 中国石油集团钻井工程技术研究院,北京昌平102206;2. 中国石油大学(北京)石油工程学院,北京昌平102249
  • 出版日期:2016-06-01 发布日期:2016-06-01
  • 通讯作者: 尹浚羽,E-mail:CUPyinjunyu@163.com
  • 基金资助:

    国家科技重大专项(2016ZX05020 006)。

Bubble Rise Velocity in Herchel-Bulkley Fluid of Drilling Annulus

YIN Junyu1,2*, ZHOU Yingcao1, ZHANG Hui2, JIANG Hongwei1, ZHU Lei1,2   

  1. 1. CNPC Drilling Research Institute,Changping,Beijing 102206,China
    2. School of Petroleum Engineering,China University of Petroleum(Beijing),Changping,Beijing 102249,China
  • Online:2016-06-01 Published:2016-06-01

摘要:

气泡在钻井环空中的运动规律是井筒多相流的一个研究重点,气泡上升速度则是其中的一个关键参数。井筒
内各流型内气泡/气体上升速度的准确性很大程度上影响了井筒多相流描述的精确性。为此,按照含气率对环空流型
进行了划分,对各流型气泡的运动行为进行了分析。系统地总结分析了单气泡在无限流域中的滑脱速度及气泡纵横
比的计算方法。利用赫巴流变模式对气泡周围表观黏度进行了修正,通过实例对比分析单气泡在赫巴流体内滑脱
速度几个计算公式,认为Rodrigue 公式相对于Harmathy 公式来说是极大的提高,能适应不同形状的气泡,可作为泡状
流流域气泡滑脱速度计算的首选公式。通过对单气泡滑脱速度进行含气率、尺寸和井斜修正,得出了环空中各流型的
气体滑脱速度计算方法,过渡流型的气泡滑脱速度则采用线性处理,并对环空气泡滑脱速度随含气率变化关系进行了
实例分析。最终通过漂移流模型给出了计算环空气泡上升速度的方法。

关键词: 钻井环空流型, 赫巴流体, 气泡滑脱速度, 漂移流模型, 气泡上升速度

Abstract:

Bubble motion laws in drilling annulus is an important part of borehole multiphase flow research. Among which
bubble rise velocity is a key parameter. The accuracy of borehole multiphase flow description highly depends on the accuracy
of bubble/gas rise velocity of each flow pattern. In the view of this,according to the void fraction,the drilling annulus flow
is divided into four patterns and then the analysis of bubble or gas motion characteristic of every pattern is carried out. The
calculation methods of single bubble slip velocity and aspect ratio in Infinite media are summarized. Apparent viscosity round
bubbles has been corrected through the Herchel-Bulkley reheology model. Through the contrastive analysis of case study
among several formulas of single bubble′s slip velocity in Herchel-Bulkley fluid,the Rodrigue′s formula is considered as
an improvement compared to the Harmathy′s formula and can be the optimal formula of bubble rise velocity in bubbly flow
pattern. The modification of calculation formulas of bubble slip velocities with regard to void fraction,bubble size and the angle
of borehole has been adopted to correct the slip velocities in four flow patterns. For the bubble slip velocity in the transforming
pattern,the liner method is proposed. The case study is applied in the relationship between bubble rise velocity and void fraction.
Finally,bubble rise velocity can be acquired through the method of drift model

Key words: flow pattern in driling annulus, Herchel-Bulkley fluid, bubble slip velocity, drift model, bubble rise velocity

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