THREE-COMPONENT DOWNHOLE SEISMIC SENSOR Russian patent published in 2020 - IPC G01V1/16 G01V1/18 

FIELD: measurement.

SUBSTANCE: invention relates to measurement equipment, in particular to seismometry, and can be used for seismic monitoring. Disclosed is a three-component downhole seismic sensor comprising, in a sealed housing with spring-loaded stabilizers, a locking unit, a generator, first and second channels for receiving horizontal components of signals and a third channel for receiving vertical signal components. Each channel includes a pendulum, a first amplifier, a calibrator, in-series connected capacitance displacement sensor, a second amplifier, a first demodulator, a feedback unit and a magnetoelectric transducer. In each channel, the pendulum is mechanically connected to a capacitive displacement sensor, a magnetoelectric transducer and a deterrence unit. Calibrator is connected to the input of the magnetoelectric converter, the first amplifier is connected to the output of the first demodulator, and the second input of the first demodulator and the capacitive displacement sensor are connected to the generator. In addition, there is a microprocessor, a digital-to-analogue converter (DAC), first, second and third analogue-to-digital converters (ADC), azimuthal displacement sensor, a goniometer, which is arranged on the rotor and connected to the rotor and encoder drive, first and second mutually perpendicular field windings and fixed n pairs of mutually perpendicular distortive windings arranged around rotor, in series connected first switch, second demodulator, first notch filter and fourth ADC, in-series connected second switch, third demodulator, second rejection filter and fifth ADC. Input of the DAC and the outputs of all ADCs are connected to a microprocessor, the rotor drive is digital, the DAC is three-channel, and the deterrence unit is three-channel and is connected to a microprocessor.

EFFECT: technical result is enabling variation of azimuth orientation of three-component borehole seismic sensor directional patterns to well.

1 cl, 3 dwg