Underground gas storage safe operation monitoring system and monitoring method

Abstract

The invention provides an underground gas storage safe operation monitoring system and monitoring method. The underground gas storage safe operation monitoring system comprises armored optical cables,quasi-distributed optical fiber pressure sensors and underground three-component detector arrays, wherein the armored optical cables and the quasi-distributed optical fiber pressure sensors are distributed inside and outside all gas injection wells, gas production wells and monitoring well sleeves and outside in-well gas injection and production pipes, and the underground three-component detectorarrays are partially distributed in a monitoring well. The measurement armored optical cables, the quasi-distributed optical fiber pressure sensors and a composite modulation and demodulation instrument placed near a wellhead are fixed to the outer side of the metal sleeve. According to the underground gas storage safe operation monitoring system, real-time on-line monitoring of changes of noise,temperature, pressure, stress / strain and distribution characteristics of microseism events in all wells is comprehensively and fully utilized, intelligent comprehensive analysis and evaluation are carried out on all parameters and information monitored in real time on line, grading classification is carried out on various risks or accidents influencing safe and stable operation of the gas storage, early warning signals and information of accident risks are issued in time, and long-term stable and safe operation of the gas storage is ensured.

Description

technical field [0001] The invention belongs to the technical field of well logging, and in particular relates to an underground gas storage safe operation monitoring system and a monitoring method. Background technique [0002] Underground gas storage is a geological structure and supporting facilities used to store natural gas. The main functions are gas peak shaving and safe gas supply, strategic reserves, improving pipeline utilization coefficient, saving investment, reducing gas transmission costs, etc. The market demand for urban gas fluctuates greatly with seasons and day and night. It is difficult to solve the contradiction of large fluctuations in gas consumption only by relying on the balanced gas transmission of the gas transmission network system to adjust the flow in a small range. Underground gas storage is used to store the excess gas in the gas transmission system when gas consumption is low, and it is produced during peak gas consumption to supplement the i...

AI Technical Summary

Problems solved by technology

Inferring the production of oil, gas and water in the downhole perforated section based on downhole noise data is basically a qualitative or semi-quantitative interpretation, and the error is relatively large

[0016] During the long-term high-pressure gas injection and gas production cycle peak-shaving operation of the gas storage, the cement sheath outside the casing of the gas injection well or gas production well will gradually become loose and damaged in the cycle of high and low pressure, resulting in underground high-pressure natural gas. Potential safety risks and accidents of leakage to the surface along the annular space between the outer wall of the gas injection well or gas production well casing and the borehole

In addition, when high-pressure natural gas is injected underground through gas injection wells, it may induce the activation of underground faults

If there are large and small faults activated by high-pressure natural gas on the sealing cap of the gas storage, the activated faults may destroy the integrity of the sealing cap of the gas storage, causing underground high-pressure natural gas to be activated along the sealing cap. Major safety hazards or accidents where the fault leaks to the ground

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