Underground gas storage well wall automation comprehensive detection system and detection method

Abstract

The invention relates to an underground gas storage well wall automation comprehensive detection system and a detection method. The system comprises an upper computer, a position measuring device, a cable lifting device, a direct current power supply and an underground movable detector, wherein the upper computer is placed on a well, and the movable detector is communicated with a device on the well through an armor cable and obtains power. Occupied space of the cable is saved, field operation is convenient, a wall thickness corrosion probe group and a flaw detection probe group are arranged inside the movable detector, detection for the wall thickness corrosion and flaws can be achieved simultaneously, and detection for the gas storage well is complete. Meanwhile, an underground device of the system integrates encouraging, receiving, amplification and signal processing and transmission functions, therefore ultrasonic signals does not need to be transmitted to the ground to be processed for a long distance, fidelity and the signal to noise ratio of the signals are greatly improved, and detection results are accurate.

Description

technical field [0001] The invention belongs to the field of ultrasonic detection of industrial gas storage wells, and in particular relates to an automatic comprehensive detection system and detection method for underground gas storage well wall thickness corrosion detection and crack detection of gas storage well walls. Background technique [0002] High-pressure underground gas storage well (hereinafter referred to as gas storage well) is a new type of gas storage equipment for CNG gas filling stations. It is a special tubular vertical pressure vessel installed underground for the purpose of storing compressed natural gas. The well body structure adopts Threaded (no welding) connection, working pressure up to 25MPa, has the advantages of small footprint, strong safety, low operating cost, and easy operation and maintenance. However, the gas storage well casing is buried deep underground (up to 260m deep). Due to formation electrochemistry, fatigue corrosion and othe...

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Problems solved by technology

[0003] At present, domestically, ultrasonic technology is used as the main method for gas storage well casing inspection, but the detection method used is limited to the detection of wall thickness corrosion, and the detection of another key defect—crack defect is not involved, which results in The detection of gas storage wells is not comprehensive, and it is easy to miss some key defects, resulting in potential safety hazards

On the other hand, in the existing equipment, the downhole equipment and the uphole equipment adopt optical fiber transmission. Although the optical fiber transmission has the advantages of fast transmission speed and large amount of transmitted data, the optical fiber is too fragile in the field operation, and it is easy to cause damage during the operation. In addition to the optical fiber, cables for transporting the detector to the underground are also required, so that one set of equipment needs to be equipped with two sets of cables and two sets of wire rollers, which increases the complexity of the equipment

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