Gas storage well shaft detection system based on ultrasonic phased array technology and detection method thereof

Abstract

The invention discloses a gas storage well shaft detection system based on an ultrasonic phased array technology and a detection method thereof. The system comprises surface equipment such as a system host, optical fiber communication equipment and an encoder as well as underground equipment such as a centering device, an ultrasonic phased array detector and an annular phased array probe. The detection method includes the steps that the system host is started, and the centering device is adjusted to keep the underground equipment in coaxial parallel with a shaft; electric signals, for detecting control information, of the system are converted into optical signals through an optical transceiver and are transmitted to the ultrasonic phased array detector through optical fiber; the annular phased array probe is stimulated by the ultrasonic phased array detector according to the focusing law to transmit ultrasonic waves to scan the shaft wall; after being converted into optical signals, collected echo electric signals are transmitted to the system host through optical fiber to be stored and processed into images. Real-time S display and C display can be achieved by the detection system, the scanning coverage rate can be flexibly adjusted by changing the stepping magnitude of an ultrasonic deflecting angle, a corroded part is located and scanned carefully, and detection speed and detection precision are high.

Description

technical field [0001] The invention belongs to the technical field of non-destructive flaw detection equipment, and relates to the non-destructive flaw detection technology for the wall thickness measurement of compression gas storage wells and the detection of pits and cracks on the well wall for natural gas filling stations, peak shaving stations and gas storage stations, etc. A gas storage well borehole detection system and detection method based on ultrasonic phased array technology. Background technique [0002] Due to the advantages of high safety performance, small footprint and low construction cost, compressed natural gas (CNG) storage wells have become the basic gas storage method for domestic CNG filling stations. Since the first underground gas storage well group was built in Sichuan Southwest Mining Area of ​​PetroChina in 1997, there have been 8,000 gas storage wells in China, some of which have entered the old age, due to the existence of formation water and ...

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Problems solved by technology

The patent application arranges a multi-layer annular water immersion probe array in the circumferential direction. The detection system increases the coverage measurement range by staggering a certain angle between layers. The sound waves received by different probes between layers need to be calibrated, and the vertical movement of downhole equipment is affected by The distance between layers is limited, and there are defects such as complex structure, difficult pre-test adjustment, low scanning coverage, and large detection error

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