微流量控制钻井中两相许用钻杆下行速度研究

doi:10.11885/j.issn.1674-5086.2014.04.27.02

西南石油大学学报(自然科学版)

微流量控制钻井中两相许用钻杆下行速度研究

孔祥伟1，2 *，林元华2，贺秋云3，邱伊婕2

1. 长江大学石油工程学院，湖北武汉430000
2.“油气藏地质及开发工程”国家重点实验室·西南石油大学，四川成都610500
3. 中国石油川庆钻探工程有限公司钻采工程技术研究院，四川广汉618300

出版日期:2016-08-01 发布日期:2016-08-01
通讯作者: 孔祥伟，E-mail：76922591@qq.com
基金资助:
国家自然科学基金（51274170）；中国博士后科学基金第57 批面上项目（2015M572495）；长江青年基金（2015cqn70）。

Research on Allowable Movement Speeds of Downward Drill Pipe in#br# Gasliquid Two Phase in MFC Drilling Operations

KONG Xiangwei1，2*, LIN Yuanhua2, HE Qiuyun3, QIU Yijie2

1. School of Petroleum Engineering，Yangtze University，Wuhan，Hubei 430000，China
2. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu，Sichuan 610500，China
3. Research Institute of Drilling & Production Engineering Technology，CCDC，Guanghan，Sichuan 618300，China

Online:2016-08-01 Published:2016-08-01

摘要/Abstract

摘要：

针对微流量控制钻井中气液两相许用钻杆下行速度问题，考虑气体滑脱、相与环空壁面阻力、回压及井底压
差，开展了对不同井深的气液两相许用钻杆下行速度半经验模型的研究，获得了气液两相许用钻杆下行速度的变化规
律。当钻杆在气液两相中下行运动时，回压的增大使井筒空隙率减小、气液两相密度增大，加载在井底的有效压力增
大，从而使许用钻杆下行速度减小；当井底气侵量增大，此时井底压力小于地层压力，许用钻杆下行速度增大，可借助
增大的激动压力消除一部分井底与地层欠压差；当井底安全压差减小，许用钻杆下行速度呈减小趋势。控压钻井中精
确计算钻杆许用下行速度，可增大钻井时效。

关键词: 微流量控制钻井, 气液两相, 激动压力, 钻杆下行速度, 气侵量

Abstract:

For the problems of allowable downward movement speed of drill pipe in gas-mud two phase during MFC drilling
operations，this paper establishes the semi-empirical model for allowable downward movement speeds of drill pipe at different
well depth by considering gas slippage，resistance between flowing phase and annulus wall，back pressure and pressure
difference in bottom hole. The variation characteristics of allowable downward movement speeds of drill pipe are acquired by
adopting the method of computer programming. The results show that when the drill pipe moving downward，increasing back
pressure will lead to the decrease of void fraction，increase of gas-liquid two-phase density and effective pressure imposed on
the bottom hole，which will further result in the decrease of allowable downward movement speeds of drill pipe. When the
gas influx rate in the bottom hole is increased，the pressure in bottom hole will be reduced to less than the formation pressure.
At that time，the allowable downward movement speeds of drill pipe can be increased because the increasing surge pressure
can eliminate a part of pressure difference between bottom hole and formation. The allowable downward movement speeds of
drill pipe should be decreased with the decrease of safety pressure difference. During the MFC drilling operation，the precise
calculation of allowable downward movement speeds of drill pipe can improve the effectiveness of drilling.

Key words: MFC drilling, gas-liquid two-phase, surge pressure, downward movement speed of drill pipe, gas influx rate

中图分类号:

TE931

孔祥伟1，2 *，林元华2，贺秋云3，邱伊婕2. 微流量控制钻井中两相许用钻杆下行速度研究[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.04.27.02.

KONG Xiangwei1，2*, LIN Yuanhua2, HE Qiuyun3, QIU Yijie2. Research on Allowable Movement Speeds of Downward Drill Pipe in#br# Gasliquid Two Phase in MFC Drilling Operations[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.04.27.02.

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微流量控制钻井中两相许用钻杆下行速度研究

Research on Allowable Movement Speeds of Downward Drill Pipe in#br# Gasliquid Two Phase in MFC Drilling Operations

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