METHOD AND DEVICE OF BOREHOLE ACOUSTIC RADIATOR WITH A SMOOTH NOZZLE INPUT FOR GENERATING WAVES OF PRESSURE IN ANNULUS OF INJECTION WELL Russian patent published in 2018 - IPC E21B43/25 E21B28/00 E21B43/16 F15B21/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to the oil industry and is intended for cleaning from solid deposits of casing walls and perforation holes, decolmatation of the bottomhole formation zone and increasing mobility of formation fluids. Borehole acoustic radiator for generating pressure waves in a liquid flow is a hollow body of revolution and consists of: cylindrical chamber with two flat covers; axially symmetric nozzle formed in the center of the front cover and an outlet with a sharp edge made coaxially with a nozzle in the center of the rear cover. Moreover, the nozzle includes a tapering accelerating portion and a cylindrical alignment portion terminating in a plane nozzle cut orthogonal to the axis of the nozzle. At the same time, the geometry of the tapering acceleration section is smoothly coupled to the geometry of the cylindrical aligning section without kink of the contour of the nozzle. In this case, the flat nozzle section is located on the inner wall of the front cover.

EFFECT: technical result is an increase in the amplitude of pressure oscillations in the annulus of the injection well.

2 cl, 6 dwg