水力喷射孔内射流增压规律试验研究

Experimental Study on the Law of Jetting Boost Pressure in Hydrajetting

水力喷射压裂是集射孔、压裂、水力封隔一体化的新型增产改造技术。本文在室内模拟试验的基础上,对影响水力喷射孔内压力分布和射流增压效果的5个参数(围压、喷嘴压降、喷距、入口比率、射孔孔眼深度)进行了系统研究,初步得到了各参数对孔内压力和射流增压的影响规律。试验结果表明,喷嘴压降和入口比率对孔内压力和射流增压影响较大,其中喷嘴压降与射流增压成线性关系,通过线性回归得到试验中6种不同直径喷嘴射流增压公式。

Hydrajet-fracturing, a unique, relatively new stimulation technology, combined hydrajetting and fracturing techniques. The five diverse factors （ confining pressure, nozzle pressure drop, nozzle distance, entry ratio and perforation tunnel depth） with the foundation of laboratory experimental data were systematically analyzed, and the law of pressure distribution of perforation tunnel and jetting boost pressure was preliminarily acquired. The results show that nozzle pressure drop and entry ratio have great influence on pressure distribution of perforation tunnel and jetting boost pressure, and there has a linear relationship between nozzle pressure drop with jetting boost pressure. It obtains jetting boost pressure formula with six different diameter nozzles on experiment through linear regression.