Controllable signal receiver capable of loading pseudo random code

Abstract

The invention discloses a controllable signal receiver capable of loading a pseudo random code, which is used for detecting and receiving electric signals in the process of oilfield exploration and development. The signal receiver comprises a signal acquisition and amplifying unit, a filter unit, an A / D conversion unit, a digital signal processor (DSP), a communication unit and a central controller unit, wherein on the one hand, the central controller unit generates the pseudo random code and converts the pseudo random code into a voltage change signal which is transmitted to the DSP by the communication unit and is stored as a characteristic signal; and on the other hand, the DSP also receives field signals which are processed by the A / D conversion unit and compares the field signals with characteristic signals, and the processing result is that only the field signals having the pseudo random code characteristic can be reserved. Because the signal receiver of the invention only receives the signals having the same characteristics as that of transmitted signals, the problems of resolution and precision of instruments can be solved fundamentally; during the ground test of an artificial electric field, interference backgrounds can be eliminated and deep low-resistance anomalous bodies can be distinguished clearly.

Description

technical field [0001] The invention relates to an electrical receiving device for detecting and receiving electrical signals in the process of oilfield exploration and development, especially a controllable signal receiver capable of loading pseudo-random codes, which is mainly used in fracturing, water injection, Profile control and process monitoring while drilling. Background technique [0002] Oil and gas production wells basically require fracture azimuth monitoring after fracturing operations, and deep gas wells also need fracturing fracture monitoring. At present, when the electrical receiver used in oilfield exploration and development tests the artificial potential field on the ground, it uses ultra-low frequency square wave / DC transmission and corresponding reception, which cannot completely eliminate interference signals of the same frequency. The signal processing method is: first receive All the same frequency signals, and then the interference signal is elimi...

AI Technical Summary

Problems solved by technology

At present, when the electrical receiver used in oilfield exploration and development tests the artificial potential field on the ground, it uses ultra-low frequency square wave / DC transmission and corresponding reception, which cannot completely eliminate interference signals of the same frequency. The signal processing method is: first receive All the same frequency signals, and then the interference signal is eliminated, so the signal-to-noise requirements are high, the background interference signal is large or the signal strength is weak, which will have a great impact on the ability to distinguish potential abnormalities, and the interference signal cannot be eliminated during the acquisition process Impact

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