METHOD OF GENERATING PRESSURE WAVES IN THE ANNULAR SPACE OF AN INJECTION WELL AND A JET ACOUSTIC RADIATOR WITH A SHORT NOZZLE AND A SLOT RESONATOR FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, namely to method and device for generation of pressure waves in annular space of injection well, and is intended for cleaning from solid deposits of walls of casing pipes and holes of perforation, decolmatation of bottomhole formation zone and increased mobility of reservoir fluids. Disclosed is a method of generating pressure waves in the annular space of the injector, the difference of which is that the acceleration section of the jet is partially placed inside the nozzle, and the remaining part – in the resonator chamber so that the minimum section of the jet dmin is in the plane of the sharp edge of the outlet hole, wherein the family of modes is reduced to a single mode with high intensity existing in a wide range of the Struhal number. Also disclosed is a jet acoustic radiator (JAR) for generation of pressure waves in the annular space of the injection well, which is a cylindrical chamber-resonator with two covers, installed in the well on the shank of the production string, in which there is a short nozzle and an outlet hole with a sharp edge. Liquid jet moves in the short chamber between the nozzle and the outlet hole. Novelty is application of short nozzle of length ln≈dn/2 and short resonator chamber Lc≈dn/2 with outlet diameter dout=1.7…1.8dn, which enables to provide intensive generation in a wide range of jet velocity variation.

EFFECT: increased amplitude of pressure fluctuations in annular space of injection well in 3 and more times.

2 cl, 5 dwg