计算窄间隙环空循环压耗的新模型  

A NOVEL MODEL CALCULATING CIRCULATING FRICTIONAL PRESSURE LOSS IN NARROW ANNULI

作　　者：丁云杰[1] 崔继明[2] 吴世立 唐威[2] 

机构地区：[1]中油股份青海油田分公司勘探事业部 [2]中原石油勘探局 [3]华北石油局

出　　处：《钻采工艺》2004年第5期9-12,共4页Drilling & Production Technology

摘　　要：影响窄环空中摩擦压降的关键因素为环空尺寸的变化、钻柱旋转及偏心。用Herschel-Bulkley模式描述钻井液的流变性,考虑钻柱偏心和旋转对钻井液在环空和钻柱内流动的影响,提出了一种新的计算窄间隙环空循环压耗的模型,将所建立模型和传统方法的计算结果与实测数据比较表明,该模型具有较高的精度,可以满足现场作业的要求。Frictional pressure loss calculations in narrow annuli of slim-hole and coiled tubing operations require more accuracy than before .The key factor of effecting frictional pressure loss in narrow annuli is variable annular dimensions ,rotation and vibration of drill string.On the basis of describing the rheological property of drilling fluid by Herschel Bulkley model and in consideration of the influence of the drillstem eccentricity and rotation on the drilling fluid flowing in annular space and drilling string ,a novel hydraulic model of calculating circulating pressure loss is put forward in the paper .Through comparing the results calculated with those measured ,it is shown that this model has higher accuracy and may meet a demand for on-site drilling operation.

关 键 词：数学模型 流变性 钻井液 计算方法 流体稠度系数 非牛顿流体 

分 类 号：TE22[石油与天然气工程—油气井工程]