射流式水力降压实验研究  

Experimental study of jet hydraulic pressure drawdown

作　　者：郑锋辉[1] 于水杰[2] 李根生[2] 罗洪斌[2] 黄中伟[2] 

机构地区：[1]中国石化华北分公司工程处 [2]中国石油大学(北京)石油工程教育部重点实验室

出　　处：《石油机械》2008年第7期4-6,22,共4页China Petroleum Machinery

基　　金：教育部科技重大项目(306003);教育部项目"长江学者与创新团队"(IRT0411)资助

摘　　要：采用研制的射流式水力降压模拟工具及其相应的试验台架,对一种在常规钻井方式下有效降低井底压力的射流式水力降压方式进行了实验研究。着重研究了工具喷嘴直径、排量及安装位置距钻头距离对降压效果的影响。研究得出如下结论:(1)射流式水力降压工具的降压效果随排量的增加而增加,在排量为9 L/s,工具距钻头距离L=0,喷嘴直径N=2.5 mm情况下,井底环空产生最大压差为0.45 MPa,当L=6 m,N=3.5 mm,工具吸入口处产生最大压差0.58MPa,该处压差平均降低17.74%;(2)工具降压效果与工具安装位置及喷嘴尺寸选择有关,工具安装在近钻头处,降压效果最明显,过于远离井底,降压效果波及不到井底,L>2 m时对井底环空压降趋近于0;(3)射流式水力降压工具可以有效地解决窄密度窗口地层的涌、漏等故障。The experimental study about decreasing the bottomhole pressure effectively with the method of hydraulic jet in conventional drilling process is made by changing the parameters including diameter of nozzle,flowing rate and location.The experimental result demonstrates that the effect increases with increasing flowing rate and lowering the locating.The optimum diameter of the nozzle depends on the location where the tool is put in.In the experimental condition,the hydraulic jet tool can make the bottomhole pressure decrease averagely by 17.74%,and buildup a maximal pressure differential of 0.58 MPa.The study makes a base for the method to be used in narrow density window section.

关 键 词：射流式水力降压工具 压差 实验研究 

分 类 号：TQ920.5[轻工技术与工程—发酵工程] TV663.8[水利工程—水利水电工程]