大位移井波动压力研究及应用
发布时间：2018-10-31 12:11
【摘要】：近年来,大位移井作为一种经济有效的井型方式和开采手段,正在我国广泛应用。在大位移井钻井过程中,由于钻井液对地层浸泡时间长,钻柱摩擦冲击井壁严重,井壁失稳问题一直是大位移井钻井过程中的主要问题。现场施工实践表明,井壁失稳与井底压力控制密切相关,大多数井壁失稳问题发生在井底压力波动期间。因此,对大位移井钻井过程中的波动压力状态展开研究,优选了大位移井井底波动压力预测模型,分析了波动压力的影响因素,以及对钻井工程优化设计和施工参数优选提供理论指导。本文研究了大位移井与常规井型在井底压力波动方面的区别,分析了稳态分析法的优势与不足,给出了将线性回归法、最小二乘法、黄金分割搜索法有机结合的钻井液流变模式优选方法。形成了大位移井偏心环空流动方程,通过对偏心环空中赫-巴流体点速度及流量分布规律的分析,形成了相对准确的波动压力预测模型,并给出了基于赫-巴流变模式的压力求解方法。对波动压力的影响因素展开研究,以堵口管下放钻柱为例,计算分析了钻井液性能、钻柱运行速度、井眼环空间隙和井深对波动压力的影响,并结合主成分分析法和灰色关联分析法对多因素条件下的波动压力影响程度进行了定量分析。最后,结合一口试验井,对现场施工中的井眼环空间隙、钻井液性能以及起下钻柱速度进行优化,推荐出了保证井壁稳定的合理工程参数范围,为现场施工提供指导。
[Abstract]:In recent years, long-reach well is widely used in our country as an economical and effective well type and exploitation method. Due to the long time of drilling fluid soaking in formation and the serious impact of drilling string friction on the wellbore, the problem of wellbore instability is always the main problem in the drilling process of extended reach wells. The field practice shows that the wellbore instability is closely related to the bottom hole pressure control, and most of the wellbore instability problems occur during the downhole pressure fluctuation. Therefore, the fluctuating pressure state in long reach well drilling is studied, the prediction model of bottom hole fluctuation pressure is selected, and the influencing factors of wave pressure are analyzed. It also provides theoretical guidance for optimum design of drilling engineering and optimal selection of construction parameters. In this paper, the difference between long reach well and conventional well in bottom hole pressure fluctuation is studied, the advantages and disadvantages of steady-state analysis method are analyzed, and the linear regression method and least square method are given. The optimal selection method of drilling fluid rheological model combined with golden section search method. The flow equation of eccentric annulus in long reach well is formed. By analyzing the velocity and flow distribution of Herba fluid point in eccentric annulus, a relatively accurate prediction model of fluctuating pressure is formed. A pressure solution method based on Herba rheological model is presented. The influence factors of fluctuating pressure are studied, and the effects of drilling fluid performance, drilling string running speed, hole annulus clearance and well depth on the fluctuating pressure are calculated and analyzed. Combined with principal component analysis and grey correlation analysis, the influence degree of fluctuating pressure under multi-factor conditions was quantitatively analyzed. Finally, combined with a test well, the hole annulus clearance, drilling fluid performance and drilling string speed in field operation are optimized, and the reasonable engineering parameter range to ensure the stability of wellbore is recommended, which provides guidance for field construction.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE242
[Abstract]:In recent years, long-reach well is widely used in our country as an economical and effective well type and exploitation method. Due to the long time of drilling fluid soaking in formation and the serious impact of drilling string friction on the wellbore, the problem of wellbore instability is always the main problem in the drilling process of extended reach wells. The field practice shows that the wellbore instability is closely related to the bottom hole pressure control, and most of the wellbore instability problems occur during the downhole pressure fluctuation. Therefore, the fluctuating pressure state in long reach well drilling is studied, the prediction model of bottom hole fluctuation pressure is selected, and the influencing factors of wave pressure are analyzed. It also provides theoretical guidance for optimum design of drilling engineering and optimal selection of construction parameters. In this paper, the difference between long reach well and conventional well in bottom hole pressure fluctuation is studied, the advantages and disadvantages of steady-state analysis method are analyzed, and the linear regression method and least square method are given. The optimal selection method of drilling fluid rheological model combined with golden section search method. The flow equation of eccentric annulus in long reach well is formed. By analyzing the velocity and flow distribution of Herba fluid point in eccentric annulus, a relatively accurate prediction model of fluctuating pressure is formed. A pressure solution method based on Herba rheological model is presented. The influence factors of fluctuating pressure are studied, and the effects of drilling fluid performance, drilling string running speed, hole annulus clearance and well depth on the fluctuating pressure are calculated and analyzed. Combined with principal component analysis and grey correlation analysis, the influence degree of fluctuating pressure under multi-factor conditions was quantitatively analyzed. Finally, combined with a test well, the hole annulus clearance, drilling fluid performance and drilling string speed in field operation are optimized, and the reasonable engineering parameter range to ensure the stability of wellbore is recommended, which provides guidance for field construction.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE242
【参考文献】
相关期刊论文 前10条
1 郭宇健;李根生;宋先知;田守]，
本文编号：2302137
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