径向水平井多孔自旋射流喷嘴设计及应用

Design and application of multiple swirling jet nozzle of radial horizontal well

李雷 王方祥 李天阳

中国石油大学胜利学院油气工程学院，山东 东营 257061 渤海钻探井下技术服务公司，天津 300270 中国石油大学（华东）石油工程学院，山东 青岛 266580

College of Petroleum Engineering, Shengli College, China University of Petroleum, Dongying 257061, China Drilling Technology Service Company, Bohai Drilling Engineering Co. Ltd., CNPC, Tianjin 300270, China School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China

为了解决目前常规射流喷嘴无法同时实现钻大孔和钻深孔的问题，设计了一种结构简单的多孔自旋射流喷嘴，并利用SIMPLEC算法对其流场进行数值模拟计算，分析了喷嘴的外流场特性，通过室内破岩实验研究了喷嘴的破岩机理，优选了喷嘴的结构参数。结果表明：多孔自旋射流喷嘴的无因次冲击区面积随定位圆半径的增大而增大，随倾斜角的增大而减小，随切向角的增大呈现出先增大后减小的规律。在倾斜角一定的条件下，切向角为16°时，无因次冲击区面积达最大值；在切向角一定的条件下，倾斜角为6°时，射流在冲击壁面形成较大的冲击区和速度较高的漫流区。定位圆半径4 mm、倾斜角6°、切向角16°的多孔自旋射流喷嘴可实现钻大直径深孔的目标，并取得了较好的现场应用效果，可作为一种新型高效的径向水平井射流喷嘴进行推广应用。

In order to solve the problem that the jet nozzle cannot achieve the goal of horizontal holes with large diameter and deep depth simultaneously, the multiple swirling jet nozzle with simple structure was designed. The outflow field of nozzle was simulated by SIMPLEC algorithm firstly, then the outflow field feature was analyzed. The rock-breaking mechanism was studied by indoor rock-breaking experiment and the structural parameters of nozzle were optimized. The results show: the impacting area of the multiple swirling jet nozzle increases with setting circle radius and decreases with extended angle, and the impacting area firstly increases and then decreases with the increase of torsion angle; under a certain inclination angle, the impacting area reaches the maximum value when the torsion angle gets 16°, and under a certain tangential angle, the area of jet impacting wall is large and the speed of overflow layer is high when the extended angle gets 6°; with setting circle radius of 4 mm and extended angle of 6° and the torsion angle of 16°, the multiple swirling jet nozzle can achieve the goal of big and deep hole simultaneously. This has achieved desired field application effect, so it can be used as a new type of radial horizontal well jet nozzle with high efficiency.

10.6056/dkyqt201802024