用流态化理论分析气体钻井携岩问题  

Analyze Cuttings Carrying during Gas Drilling by Fluidization Theory

作　　者：王朝飞[1,2] 朱忠喜[1] 吴继伟[3] 雷先志 

机构地区：[1]长江大学(武汉校区)石油工程学院,湖北武汉430100 [2]中国石油新疆油田公司工程技术处,新疆克拉玛依834000 [3]中国石油新疆油田公司工程技术研究院,新疆克拉玛依834000 [4]中国石油塔西南勘探开发公司柯克亚作业区,新疆库尔勒844804

出　　处：《天然气技术与经济》2013年第1期43-45,79,共3页Natural Gas Technology and Economy

摘　　要：气体钻井工程设计和施工中最小注气量的计算是非常关键的,通常采用修正的Angel模型进行计算,此模型弱化了岩屑颗粒在井筒中运移的本质规律,而应用颗粒运动流态化理论可以对模型更好地补充。通过分析气体钻井井筒内岩屑颗粒受力情况及岩屑运移过程中颗粒所受曳力和气体流速之间的关系,得出了单个颗粒能够顺利向上运动的临界气体流速计算方法。在考虑球形度和边壁效应对流化床影响的情况下,修正了曳力和临界气体流速计算公式,得出了在满足井眼净化条件下气体流速和体积流量的计算方法。结合SNL-7井空气钻井实钻资料进行实例计算,得到的结果更加接近实钻情况,证明颗粒运动流态化理论更能真实地反映气体钻井岩屑运移的本质规律,更有利于对气体钻井携岩问题的研究。To calculate the minimum gas injection rate is very important in engineering design and construction for gas drilling. The amended Angel model is commonly adopted. Although it weakens the laws of cuttings migrating in wellbore, fluidization theory of cuttings movement can better reflect them. By analyzing the force condition of cuttings in wellbore and the relationship between drag force on cuttings and gas flow rate during migration, an equation is obtained to calculate the critical gas flow rate under which single cuttings can move up smoothly. Considering the impacts of sphericity and wall effect on fluidized bed, the drag force and equation are amended, and some methods to calculate gas flow rate and gas volume flow meeting the requirements of hole cleaning are also obtained. Moreover, a practical calculation for SNL-7 well demonstrates that fluidization theory not only can reflect really the laws of cuttings migration but also is helpful for studying cuttings carrying during gas drilling.

关 键 词：气体钻井颗粒运动 流态化 曳力 岩屑运移 边壁效应 

分 类 号：TE242.6[石油与天然气工程—油气井工程]