A water content monitoring system around oil and gas pipelines in permafrost regions

Abstract

The invention provides a monitoring system for water content in soil around an oil and gas pipeline in a freeze soil area based on fiber grating sensing technology. According to the invention, a fiber grating water content sensor group is installed around an oil and gas pipeline (2) in a freeze soil area, all the fiber grating sensors are cascaded and welded and then led to a monitoring station through an optical cable (12); the optical cable (12) is connected with an optical switch (13); the optical switch (13) is connected with a fiber grating demodulation instrument (14); the fiber grating demodulation instrument (14) is connected with a lower computer (15); the lower computer (15) transmits preprocessed data to a low-orbit satellite (17) through a satellite communication module (16); the low-orbit satellite (17) forwards the data to a satellite communication module (18); and the satellite communication module (18) transmits the received data to a host computer (19) for analysis and processing. The monitoring system provided by the invention has the advantages of high precision, high stability and low cost.

Description

technical field [0001] The invention is a water content monitoring system around oil and gas pipelines in permafrost regions based on optical fiber grating sensing technology, and relates to the technical fields of length measurement, temperature measurement, other types of measurement, general control systems and pipeline systems. Background technique [0002] Frozen soil is a special kind of soil, the temperature is negative temperature or zero temperature, and the soil containing ice is called permafrost. According to the length of the frozen state of the soil, frozen soil can generally be divided into short-term frozen soil (a few hours to half a month), seasonal frozen soil (half a month to several months) and permafrost (more than two years). my country's permafrost is very developed. The permafrost area is about 2.11 million square kilometers, accounting for 23% of my country's total land area and ranking third in the world. The area of ​​permafrost is about 5.14 mill...

AI Technical Summary

Problems solved by technology

[0007] Although domestic and foreign pipeline operators have taken active measures to deal with frost heaving and thawing disasters in permafrost regions, the formation mechanism of frost heaving and thawing disasters is very complicated, and the characteristics of permafrost in different regions are different. There is no mature monitoring technology that can monitor the impact of frost heaving and thawing disasters on pipelines

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