Acoustic logging system

Abstract

The invention discloses an acoustic logging system using acoustic waves for transmitting signals. The system is mainly composed of a detection system, a piezoelectric transducer, an oil pipe, a relay converter and an acoustic wave receiver. Signals are detected by the detection system, converted by the piezoelectric transducer, transmitted by the oil pipe, and received by the acoustic wave receiver. The system can monitor the underground working state in real time, uses the acoustic wave as a signal transmitting carrier which is small in attenuation, and is suitable for deep well operation; moreover, the propagation speed, in a steel medium, of the acoustic wave is high, and the signal transmitting efficiency can be greatly improved; the oil pipe serves as a channel to transmit the signals, and therefore cost is saved. A Helmholtz amplifier is used for amplifying the signals of the receiving end, the device is simple in structure, magnification times are large, and the resonance frequency is only related to the size parameter of the device. An optical fiber displacement sensor is used for receiving the signals, the system does not make direct contact with a detected object, transmitting loss measurement of light in optical fibers is used, and the system is high in sensitivity.

Description

technical field [0001] The invention relates to a logging system. To be precise, it involves a sound wave logging system that uses sound waves to carry signals, oil pipes as channels, Helmholtz amplifiers as signal amplifiers, and optical fiber displacement sensors as signal receivers. Background technique [0002] The development of the petroleum industry has made people more and more dependent on petroleum as a fossil energy source, and it has also made the exploration and exploitation of petroleum resources particularly important. With the continuous development of science and technology, oil extraction has gradually entered the era of refinement, informationization and automation. In the process of oil reservoir exploitation, miners generally do not come into direct contact with the ore body. The exploitation of oil and gas, the understanding of the situation in the oil and gas reservoir, and various measures to exert influence on the oil and gas reservoir must be carri...

AI Technical Summary

Problems solved by technology

However, electromagnetic signals are severely attenuated in the formation, and are easily interfered by drilling equipment and low resistance of the formation, so long-distance data transmission cannot be realized for the time being; acoustic wave transmission uses the drill string pipe wall as the propagation medium and sound waves as the signal carrier. A technology for wireless transmission of downhole data through the propagation of sound waves in the drill string

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