天然气斜井携液临界流量预测方法  

Prediction method of critical liquid-carrying flow rate for directional gas wells

作　　者：李丽[1] 张磊[2] 杨波[3] 殷茵[1] 李登伟[1] 

机构地区：[1]中国石化国际石油勘探开发有限公司,北京100029 [2]中国石油西南油气田分公司华油公司,四川成都610017 [3]中国石油新疆油田分公司陆梁油田作业区,新疆克拉玛依834000

出　　处：《石油与天然气地质》2012年第4期650-654,共5页Oil & Gas Geology

摘　　要：目前,广泛应用的天然气井携液临界流量计算模型是建立在直井基础之上的,没有考虑井斜角对携液的影响。但是,随着定向井和水平井的日益增多,现有直井计算模型已经不能准确预测斜井的携液临界流量。为解决这个问题,以Turner计算模型为研究基础,同时考虑井斜角的影响,根据球形液滴的受力条件,认为其在斜井井筒运动过程中不会一直沿井筒中心线上升,而是慢慢运移至油管壁,最终沿管壁向上方滑动。依据牛顿摩擦定律,计算出管壁对液滴的摩擦力,重新建立液滴受力模型,提出了斜井携液临界流量预测模型。最后,在Turner模型的基础上,推导出了修正系数表,认为修正系数与摩擦系数和井斜角有关。通过现场实例应用,计算结果表明该计算方法具有较高的精度。Current popular models for calculating critical liquid-carrying flow rate for directional gas wells are established based on vertical wells without considering the influences of deviation angle on liquid-carrying.Now more and more directional wells and horizontal wells are deployed in coal-bed methane recovery,but the current vertical well-based models cannot accurately predict the critical liquid-carrying flow rate of these wells.To solve this problem,we performed study based on Turner calculation model with impacts of deviation angle integrated.Analysis of the force balance of spherical droplets reveals that the liquid drops do not always rise up along the central line but fall off slowly on the tubing wall and finally glide up along the tubing.According to Newton’s friction law,we calculated the friction force between the tubing wall and liquid drop,and rebuild a new model to predict critical liquid-carrying flow rate for directional gas wells.Finally,on the basis of the Turner model,we derived correction factors which are related to the friction coefficients and the deviation angles.The practical application shows that this calculation method has higher precision.

关 键 词：携液 临界流量 修正系数 斜井 天然气开发 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]