ECHO-SOUNDING DEVICE FOR LIQUID LEVEL MEASUREMENT IN WELL Russian patent published in 2006 - IPC E21B47/04 

FIELD: oil well survey, particularly to control liquid level in well during well operation without gas outburst in atmosphere.

SUBSTANCE: echo-sounding device comprises body to be connected to casing pipe head nipple by means of adapter coupling, as well as acoustic pulse generator, acoustic pulse receiver made as piezoelectric microphone, pressure transducer and control unit. Acoustic pulse generator is made as piezoelectric cell provided with pulse amplifier made as diffuser and electrically connected with electric pulse generator. Control unit is provided with pre-programmed processor adapted to automatically correct measurement results with taking into consideration speed of pressure acoustic pulse propagation and gaseous mixture composition in annulus. Leads connected to pressure transducer and piezoelectric microphone are attached to electric pulse generator and linked to terminal of multiple-conductor cable extending from control unit to above pulse generator. The piezoelectric microphone may be installed in front of diffuser, which is located as close as possible to adapter coupling. The echo-sounding device may be installed in quickly-releasable case having hinged lid provided with lock.

EFFECT: increased echo-sounding device reliability.

4 cl, 2 dwg, 1 tbl