RADIATION COMPLEX FOR OIL AND GAS WELLS Russian patent published in 2003 - IPC

FIELD: geological prospecting. SUBSTANCE: invention is related to geophysical downhole equipment and equipment for acoustic attack on beds. It can be employed in oil and gas branches of industry to intensify extraction of mineral wealth. Radiation complex includes ground unit incorporating power supply source, downhole tool connected to ground unit with the use of feeding cable and comprising acoustic radiator and downhole amplifier that includes filter, power amplifier, load matching module and master oscillator. Single-core load-bearing geophysical cable is utilized to feed power and control signals to downhole tool and to send measurement and test signals in backward direction. Ground unit is equipped with voltage regulator, interface module, controller, module of energy-independent memory, modem and current mixer. Downhole amplifier is fitted with overvoltage protection unit, current mixer, current transformer, detector, frequency meter, resistive divider and modem. Acoustic radiator has piezoelectric converters and feedback module to transmit information to downhole amplifier. Power commercial network is connected to input of power supply unit through voltage regulator, output of power supply unit is connected through power channel of first current mixer of ground unit to central core of load-bearing geophysical cable. First port of controller of ground unit is coupled to interface module, its second port is coupled to port of module of energy-independent memory, its third port is connected to personal computer, its fourth port is coupled through modem and signal channel of current mixer connected in series to central core of load- bearing geophysical cable which is coupled through overvoltage protection unit, power channel of current mixer and downhole tool filter to supply bus of its power amplifier. Signal channel of current mixer of downhole tool has two way communication through modem with signal port of controller. Controlling output of controller is connected through master oscillator to signal input of power amplifier which output is coupled to radiator through load matching module and current transformer connected in series. Output of frequency meter, output of current transformer are connected through detector to measurement inputs of controller, output of resistive divider connected to output of power amplifier and output of feedback module coupled to radiator mechanically or through downhole fluid are also connected to measurement inputs of controller. Armor of load-bearing geophysical cable is linked to zero bus of radiation complex. Downhole amplifier and acoustic radiator are positioned in separate packages. EFFECT: raised functional reliability of radiation complex, increased efficiency of acoustic attack on bed, improved operational characteristics of radiation complex. 1 cl, 1 dwg