Разработка ультразвукового приемопередатчика для скважинной телеметрии

Abstract

Hydrocarbons are the significant part of the Russian Federation's exports. Due the exploration of hard-to-recover reserves, it is necessary to design and improve technical tools and methods to increase the efficiency of the geophysical information transfer in the logging of wells. A new communication channel for the telemetry transfer is proposed and investigated. The main idea is to use an acoustic signal in the ultrasonic frequency band and inner tube space as a transmission media. The inner tube space contains a more homogeneous media than the rocks behind the casing string. The use of ultrasonic frequencies reduces the signal scattering into the annular space. It is assumed that it will improve the reliability of the transferred information. The designed ultrasonic receiver and digital signal transmitter in the “Manchester II” code are presented based on the ma40s4s ultrasonic radiating element and the ma40s4r ultrasonic sensor. A test bench has been designed to evaluate the effectiveness of the technical solution. During the experiments, a significant influence of interference was revealed. Despite significant attenuation in a conductive media, this phenomenon significantly increases the signal amplitude, but makes it difficult to identify it, because the pauses between symbols are filled with the reflected signal. Evaluation of the ultrasonic signal attenuation in the inner tube space was carried out, and a conclusion was carried out concern the prospects of ultrasonic communication channel.