Downhole Information Acoustic Signal Relay System

Abstract

The invention relates to a down-hole information acoustic wave signal relay system. The down-hole information acoustic wave signal relay system comprises an upper connector, an instruction bin protective cylinder and a lower connector which are sequentially connected. An energy converter protective cylinder, an instrument bin and an accelerometer protective cylinder which are sequentially connected are arranged in the instruction bin protective cylinder. The end of the energy converter protective cylinder is matched with the upper connector, and the end, connected with the accelerometer protective cylinder, of the instrument bin is connected with the end of the instruction bin protective cylinder. The end of the accelerometer protective cylinder is matched with the lower connector, and an energy converter is installed in the energy converter protective cylinder. A circuit module is arranged in the instrument bin and comprises an energy converter driving circuit, a coding and transcoding circuit and a decoding circuit, and an accelerometer is arranged in the accelerometer protective cylinder. According to the down-hole information acoustic wave signal relay system, while normal well drilling is kept, real-time receiving of acoustic wave signals carrying well drilling information and from the lower portion of a drilling pillar is achieved; the effective signals are enlarged and then occurs again, long-distance stable transmission of the well drilling information is achieved, and the damping problem when the acoustic wave signals carrying the well drilling information are transmitted is solved; and drilling fluid and a stratum are not relied on, the noise interference resistance capacity is high, real conversion of the well drilling information is achieved, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas drilling engineering, and relates to an information transmission system while drilling, in particular to an acoustic signal relay system for downhole information based on acoustic waves. Background technique [0002] According to the current geological conditions and natural environmental conditions encountered in the exploitation of oil and gas resources in the world, the future oil drilling industry will encounter severe challenges of more complex geological conditions and harsher natural environments. Therefore, the downhole process monitoring of oil and gas drilling has put forward higher requirements. requirements. [0003] The high-speed transmission and effective acquisition of downhole information is the key to accurate monitoring of downhole processes and the key technology to achieve fast and high-quality drilling. Currently, four methods of downhole information transm...

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Problems solved by technology

[0004] (1) Wired transmission: Although it can realize fast and large-scale transmission of downhole information, the rotation of the drill string during the drilling process will easily cause the transmission cable to be worn or twisted, affecting normal drilling

[0005] (2) Drilling fluid pulse transmission: The pressure wave of drilling fluid is used as the transmission carrier, which has a strong dependence on drilling fluid, and has disadvantages such as slow transmission rate, susceptibility to downhole noise interference, and inability to realize two-way information transmission.

[0006] (3) Electromagnetic wave transmission: Although it gets rid of the dependence on drilling fluid and can realize two-way transmission of downhole information, it has the disadvantages of dependence on the formation, large attenuation in the formation, poor versatility, and high cost.

However, the attenuation of sound waves during transmission in the bottom hole drill string has always been a bottleneck restricting the popularization and application of drilling information sound wave transmission technology

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