控压钻井井底气侵停止与否实时判别方法研究

何淼; 柳贡慧; 李军; 张涛; 李梦博; 郭庆丰

doi:10.3879/j.issn.1000-0887.2015.08.008

控压钻井井底气侵停止与否实时判别方法研究

doi: 10.3879/j.issn.1000-0887.2015.08.008

何淼¹,
柳贡慧^1,2,
李军¹,
张涛²,
李梦博³,
郭庆丰⁴

¹中国石油大学石油工程学院,北京 102249;²北京信息科技大学,北京 100192;³中海油研究总院,北京 100027;⁴中国石油勘探开发研究院,北京 100083

基金项目: 国家自然科学基金（重点项目）（51334003）；国家自然科学基金（面上项目）（51274221；51274045；51374223）

详细信息

作者简介:
何淼（1989—），男，湖北荆门人，博士生(通讯作者. E-mail: 18810459934@163.com).

中图分类号: TE21
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出版历程
- 收稿日期: 2015-02-02
- 修回日期: 2015-06-24
- 刊出日期: 2015-08-15

A Real-Time Identification Method for the Bottomhole Gas Invasion State in Managed Pressure Drilling

¹School of Petroleum Engineering, China University of Petroleum,Beijing 102249, P.R.China;²Beijing Information Science & Technology University, Beijing 100192, P.R.China;³CNOOC Research Institute, Beijing 100027, P.R.China;⁴Research Institute of Petroleum Exploration & Development, Beijing 100083, P.R.China

Funds: The National Natural Science Foundation of China（Key Program）（51334003）;The National Natural Science Foundation of China（General Program）（51274221;51274045;51374223）

摘要

摘要: 实时判别井底气侵停止与否是控压钻井井控方法的关键，直接关系到基于立压控制法循环排气或常规关井等后续作业的选取.综合考虑气体运移膨胀和气体溶解的因素，指出出入口流量一致并不等同于井底气侵停止，两者存在时间先后关系.基于快速施加井口回压控制方法，建立了控压钻井井筒与地层耦合的多相变质量流动模型，采用有限差分法迭代求解，模型计算值与实验测量值吻合较好.模拟结果表明，出口流量有无明显拐点是区分出入口流量一致和井底气侵停止时间先后的标志.一旦井底气侵停止，立管压力的二阶导数会迅速降至0点附近且趋于稳定.根据上述参数变化特征，提出了基于出入口流量和立管压力实时监测的井底气侵停止与否实时判别方法.该研究对于完善控压钻井井控理论具有重要的指导意义.
- 控压钻井 /
- 出入口流量 /
- 井口回压 /
- 立管压力 /
- 二阶导数
Abstract: Real-time identification of the bottomhole gas invasion state is the key to well control during managed pressure drilling (MPD), which is directly related to the selection of follow-up operations involving the gas circulation exhaust based on standpipe pressure control or the conventional shut-in procedure. In view of the factors of gas migration expansion and dissolution, it is pointed out here that the equilibrium between outlet flow and inlet flow does not directly mean the stop of bottomhole gas invasion, and there is a precedence relationship between them. Based on the rapidly increasing wellhead back pressure control method, an MPD wellbore-formation coupling model for multiphase variable-mass flow was established, and the finite difference method was used to iteratively solve this model. The calculated results agreed well with the experimental measured ones. The simulation results show that the obvious inflexion point of the outlet flow is a sign for distinguishing the precedence relationship between the outlet-inlet flow equilibrium and the bottomhole gas invasion stop. Once the bottomhole gas invasion stops, the 2nd derivative of the standpipe pressure will quickly drop to near zero and keep stable thereafter. According to the above parameter variation characteristics, a real-time identification method for the bottomhole gas invasion state based on the outlet and inlet flow as well as the real-time monitored standpipe pressure was proposed. This study has guiding significance for the improvement of the MPD well control theory.
- managed pressure drilling /
- outlet and inlet flow /
- wellhead back pressure /
- standpipe pressure /
- 2nd derivative

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参考文献(17)

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