DOWNHOLE SOUND EMITTING DEVICE Russian patent published in 2007 - IPC E21B43/25 G01V1/40 

FIELD: acoustic engineering, particularly to stimulate oil or other fluid influx to producing well.

SUBSTANCE: sound emitting device comprises sealed body filled with dielectric liquid and piezoceramic sectional ring assembly. The body is made as sound-permeable metal shell provided with end flanges. The piezoceramic sectional rings are coaxially installed in the body and divided with positioning washers made of dielectric material. The rings are pressed to end flanges by means of positioning washers. The body is provided with cylindrical protective perforated metal case fastened to end flanges. Positioning washers have rubber coverings including rims at washer ends created from the side of outer piezoceramic ring surfaces. Local projections are made on cylindrical surfaces of the rims. The local projections are resiliently pressed to inner surface of sound-permeable shell. To obtain maximal possible effect sound-permeable metal shell is formed of titanium alloy and radius-thickness ratio thereof is 14-16.

EFFECT: decreased sound emitting device size up to value providing sound emitting device passage through flow string along with increased power.

2 cl, 2 dwg