煤层气水平井井筒煤粉迁移规律试验研究

发布时间：2018-03-14 14:12

本文选题：煤层气　切入点：水平井　出处：《煤炭科学技术》2016年05期 　论文类型：期刊论文

【摘要】：为研究煤层气水平井井筒煤粉迁移特征及规律,有效控制煤粉产出,开展了多相流驱替状态下的水平圆管煤粉迁移物理模拟试验。通过调节流量、控制压差的方式,分析了不同粒径大小的煤粉在不同圆管倾角下的迁移特征及规律。结果表明:生产条件下井筒流态以紊流为主,应重点研究了雷诺数为4 000~6 000下的流态;两相流煤粉迁移模式为滑动、滚动、层移和悬移,三相流煤粉迁移主要受不同流型的影响;煤粉迁移模型表明煤粉迁移制约因素主要有流量、流型(气液比)、煤粉粒径、管道倾角和压差。综上认为,钻井阶段选择合适造斜点,控制井斜角变化;考虑煤粉性质及排采阶段变化,适时调整排水强度和井底压降,有效控制井筒流态,可保证井筒内煤粉适度产出。
[Abstract]:In order to study the characteristics and laws of pulverized coal migration in coal bed methane horizontal wells and effectively control the coal powder output, a physical simulation test of horizontal circular tube pulverized coal migration under the condition of multiphase flow displacement was carried out. By adjusting the flow rate, the pressure difference was controlled. The migration characteristics and rules of pulverized coal with different particle sizes under different pipe inclination angles are analyzed. The results show that the wellbore flow pattern is mainly turbulent under production conditions, and the flow pattern with Reynolds number of 4 000 ~ 6 000 should be studied emphatically. The migration patterns of two-phase flow pulverized coal are sliding, rolling, stratification and suspension, and the three-phase flow migration is mainly affected by different flow patterns, and the model shows that the main restricting factors of pulverized coal migration are flow rate, flow pattern (gas-liquid ratio, particle size of pulverized coal), In summary, it is considered that the proper diagonal point should be selected in drilling stage to control the change of well inclination angle, considering the change of pulverized coal quality and discharge stage, the drainage strength and bottom hole pressure drop should be adjusted at the right time, and the wellbore flow state should be effectively controlled. It can ensure the proper output of pulverized coal in wellbore.
【作者单位】：中国石油华北油田公司;西安科技大学地质与环境学院;国家能源煤与煤层气共采技术重点试验室;中国石油大学(北京)煤层气研究中心;
【基金】：国家科技重大专项资助项目(2011ZX05061)
【分类号】：TE37

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