气侵钻井过程中井底衡压的节流阀开度控制研究

孔祥伟; 林元华; 邱伊婕; 袁继明

doi:10.3879/j.issn.1000-0887.2014.05.011

气侵钻井过程中井底衡压的节流阀开度控制研究

doi: 10.3879/j.issn.1000-0887.2014.05.011

¹西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500;²长庆油田勘探开发研究院, 西安 710000

基金项目: 国家科技重大专项(2011ZX05022-005-005HZ);国家自然科学基金（51274170）

详细信息

作者简介:
孔祥伟（1982—）,男,黑龙江大庆人，博士生(通讯作者. E-mail: 76922591@qq.com);

中图分类号: O352
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出版历程
- 收稿日期: 2013-11-06
- 修回日期: 2014-03-03
- 刊出日期: 2014-05-15

Research on the Throttle Valve Opening Degree Control to Keep Bottomhole Pressure in Balance When Gas Influx Occurs During Drilling Operations

¹State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, P.R.China;²Research Institute of Exploration and Development of Changqing Oil Field, Xi’an 710000, P.R.China

Funds: The National Science and Technology Major Project of China(2011ZX05022-005-005HZ)；The National Natural Science Foundation of China（51274170）

摘要

摘要: 基于钻井中的多相流控制体方程，建立了井底衡压的节流阀套压补偿控制模型，通过节流阀的实时调节可补偿气相滑脱压降，使井底压力与地层压力保持平衡.结果表明，气侵发现得越早，井底衡压控制越容易实现，气侵早期发现依靠井底气侵监测装置；当发现井底气侵时，大幅调节节流阀开度，使节流阀产生的套压快速平衡地层压力，此时根据井底欠压差的变化调节节流阀；随气体沿环空上移，微调节流阀开度，实时平衡气体滑脱产生的压降，此时调节节流阀依靠补偿控制模型；随气体循环出井口，环空中呈现0气流，节流阀开度及套压趋于稳定.
- 衡压钻井 /
- 节流阀开度 /
- 气液两相 /
- 环空 /
- 流量系数
Abstract: Based on the micro control body equations of multiphase flow for drilling operation, a model for compensation balance control of back pressure was proposed to adjust the throttle valve in real-time through compensation for gas slippage pressure drop, which can maintain balance between bottomhole pressure and formation pressure. Results show that the earlier the gas influx is detected, the easier the balance of bottomhole pressure can be achieved. The early detection of gas influx relies on the downhole detection tools. When gas influx occurs in the bottomhole, the throttle valve opening degree should be adjusted sharply to balance the formation pressure rapidly with the back pressure. Adjustment of the throttle valve opening degree depends on the change of pressure difference in the bottomhole. As the gas migrates upwards along the annulus, the throttle valve should be adjusted slightly in real-time to balance the pressure drop generated by gas slippage according to the compensation balance control model. When the gas flow away from the wellhead with the circulation, 0 gas flow appears in the annulus, and the throttle valve opening degree and back pressure tend to be stable.
- balance pressure drilling /
- throttle valve opening degree /
- gas-liquid two-phase /
- annulus /
- flow coefficient

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参考文献(15)

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