管内转向径向水平井携岩规律数值模拟.pdf

CHINA PETROLEUM MACHINERY
2013年第41卷第11期
钴井技术与装备
管内转向径向水平井携岩规律数值模拟
马东军李根生2郭瑞昌1王伟
(1.中国石化石油工程技术研究院2.中国石油大学(北京)油气
资源与探测国家重点实验室3.中国石油集团钴井工程技术研究院
摘要:为了对管内转向径向水平井携岩规律进行研究,根据流体力学理论建立了管内转向径
向水平井携岩过程的数学模型和物理模型,采用数值模拟方法研究了流量、钻速和井径等参数取
不同值时,环空载面混合流体速度分布规律和岩屑体积分数分布规律。分析结果表明,随着流量
的增大,混合流体紊流强度增强,悬浮层内岩屑体积分数増大,固定床层内岩屑体积分数减小,
岩層床总高度降低,偏心环空内高速流核区范围増大;随着井径的扩大,岩屑在偏心环空上的非
均匀性增强,偏心环空底部岩屑床高度增加,偏心环空中高速流核区减小,零速度区范围逐漸增
大,混合流体平均流速减小。
关键词:管内转向;径向水平井;携岩规傳;混合流体;岩屑床
中图分类号:TE246文献标识码:Adoi:10.3969/j.isn.1001-4578.2013.1.002
Numerical Simulation of the Cuttings-carrying
Law in Radial orizontal Well
Ma Dongjun 'Li Gensheng Guo Ruichang Wang Wei
(1. S/NOPEC Research Institute of Petroleum Engineering 2 State Key Laboratory of Petroleum Resouree and Prospecting, China
Uninersity of Petroleum, Bejjing 3. CNPC Drilling Research Institute)
Abstract: To study the law of carrying cuttings in in-casing steering radial horizontal wells, the mathematical
and physical models of the cuttings-carrying process in the wells were established according to hydrodynamic theo
ry. The numerical simulation method was used to study the distribution laws of mixed fluid velocity in annular sec
tion and cuttings volume fraction when different values were taken with regard to such parameters as flowrate, drill-
ing rate and borehole diameter. The analysis shows that, with the increase of flowrate, the turbulence intensity of
mixed fluid increases, the cuttings volume fraction increases within the suspension layer and decreases within the
fixed bed layer, the overall height of the cuttings bed decreases, and the scope of the high speed flow core zone
within the eccentric annulus increases; with the increase of borehole diameter, the unevenness of cuttings in eccen-
tric annulus increases, the height of the cuttings bed at the bottom of eccentric annulus increases, the high speed
flow core zone reduces within eccentric annulus, the scope of zero speed gradually increases and the average flow-
rate of mixed fluid decreases
Key words: in-casing steering; radial horizontal well; cutting-carrying law; mixed fluid; cuttings bed
其具体工艺流程是首先利用磨铣钻头或磨料射流在
套管上开孔,然后用连接自进式射流钻头的高压软
管通过先前在套管上所钻的孔眼在目的油层中钻小
管内转向径向水平井技术起步于20世纪末,直径的水平井-9。该技术不仅节约施工成本,而
基金项目:国家973计划项目“深井复杂地层安全高效钻井基础研究”(2010CB226700);国家油气重大专项“复杂结构井优化设计
与控制关键技术”(2011ZX05009-005