2 results about "Rate modulation" patented technology

The application belongs to the technical field of CO2 storage migration monitoring, and discloses a CO2 storage migration monitoring method and system based on distributed optical fiber acoustic wave sensing. By controlling the time-varying flow rate modulation coding sequence of the injected fluid, the wellbore itself is converted into a controllable virtual phased array sound source distributed along the wellbore. By using the pre-solved frequency-radiation angle mapping relationship, the direction of the acoustic wave energy radiated to the formation can be controlled by changing the frequency of the injected signal, and the directional scanning of the formation around the well is realized. This method does not need to lower a special acoustic logging instrument, reduces the operation cost and risk, and can flexibly adjust the detection angle and range according to the monitoring requirements.