泡沫在连续管螺旋管段内流动的压降数值模拟  

Numerical simulation on pressure drawdown of foam flowing in coiled tubing spiral section

作　　者：张小宁[1] 姜凤光[1] 李根生[2] 张明坤 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学油气资源与探测国家重点实验室,北京102249 [3]中国石油天然气勘探开发公司,北京100034

出　　处：《石油钻采工艺》2011年第6期5-9,共5页Oil Drilling & Production Technology

基　　金：国家重点基础研究发展规划(973)项目"深井复杂地层安全高效钻井基础研究"(编号:2010CB226704)的部分内容

摘　　要：通过自定义函数和数值模拟方法研究泡沫流体在连续管中流动的压降,并且对比了计算结果与模拟结果。对于泡沫在直管段内流动,由于考虑了加速压降和真实速度剖面的影响,模拟压降比计算压降大。对于泡沫在螺旋管段内流动:由于泡沫具有压缩性,其物性随压力变化,所以当出口压力不同时,同一位置处速度剖面和密度剖面不同;由于离心力的作用,速度剖面不对称;出口压力、注气流量和曲率对压降影响比较明显。对连续管泡沫钻井进行水力参数设计时,尽可能地提高注入压力,可减少泡沫在螺旋管段流动的压降。Through user defined function and numerical simulation method,the pressure drop of foam flowing in coiled tubing was studied.The simulated results were compared with that gained by empirical correlation.For foam flowing in straight tubing section, the simulated pressure drop was higher than the calculated because of the effect of acceleration pressure drop and the consideration of velocity profile variation.For foam flowing in spiral section,the physical properties of the compressed foam varied with the variation of pressure,so the velocity profile and density profile would be different at the same section under different exit pressure.The velocity profiles were asymmetry due to centrifugal force.The exit pressure,gas injection rate and curvature obviously influenced the pressure drop.For designing the hydraulic parameters of foam drilling with coiled tubing,with the permission of experiments,the injection pressure should be enhanced as largely as possible to decrease pressure drop of foam flowing in the spiral section.

关 键 词：泡沫流体 连续管 注气流量 出口压力 曲率 数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程]