Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area

A technology of relative displacement and oil and gas pipelines, which is applied in pipeline systems, measuring devices, optical devices, etc., and can solve problems such as unseen goaf pipe soil

Active Publication Date: 2012-02-08
PIPECHINA SOUTH CHINA CO
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Problems solved by technology

[0018] Due to these advantages, in the field of geotechnical engineering, fiber grating sensors are easy to embed in rock and soil for high-resolution and wide-range measurement of internal strain and temperature. The technical advantages are ve

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  • Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area
  • Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area
  • Method and system for monitoring pipe-soil relative displacement of oil-gas pipeline in mining subsidence area

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Embodiment

[0086] Embodiment. This example is an experimental method and system, and its constitution is as Figure 1-Figure 8 shown. The test was carried out in a goaf subsidence area with mining depth ratio of 10, mining length of 15m, pipeline buried depth of 3m and pipeline length of 130m. The diameter of the pipeline is 168mm, the wall thickness is 6mm, and the steel grade is L245.

[0087] The process flow of the relative displacement monitoring method of oil and gas pipelines in the goaf subsidence area based on fiber bragg grating sensing technology is as follows: figure 1 shown. After the wavelength signal collected by the sensor is demodulated and preprocessed at the on-site monitoring station, it is remotely transmitted to the off-site monitoring center. After receiving the data, the monitoring center further analyzes and processes the data through a specific algorithm to calculate the relative displacement of the pipe and soil. , so as to determine the state stability of th...

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Abstract

The invention discloses a method and a system for monitoring pipe-soil relative displacement of an oil-gas pipeline in a mining subsidence area based on a fiber grating sensing technology. The method comprises the following steps of: demodulating and preprocessing a wavelength signal acquired by a sensor on a field monitoring station, and remotely transmitting the signal to a remote monitoring center; receiving data by the monitoring center, further analyzing and processing the data with a specific algorithm, and computing pipe-soil relative displacement change in the mining subsidence area; dynamically displaying the pipe-soil relative displacement change in the mining subsidence area to judge the state stabilities of pipe body strain change and soil body strain change, and judging whether the data surpass threshold values; making an alarm when the monitored value of pipe-soil relative displacement surpasses a preset value and keeps constant; when a parameter value is smaller than a threshold value, judging that the pipeline is in a safe state; and when a pipe-soil relative displacement value reaches a threshold value and keeps constant, performing pipeline safety early-warning.

Description

technical field [0001] The invention relates to a method and system for monitoring the relative displacement of oil and gas pipelines in goaf subsidence areas based on optical fiber grating sensing technology, and relates to the technical fields of stress measurement, temperature measurement, similar linear dimension measurement, and pipeline systems. Background technique [0002] The space formed after the underground mine is mined is called the goaf. After the underground mineral layer is mined, the upper rock layer loses its support, the balance condition is destroyed, and then it bends and collapses, so that the surface sinks and deforms, causing the surface to subside and form a depression. With the continuous expansion of the goaf, the depression continues to develop and form the goaf subsidence area, which will cause damage to the above-ground or underground buildings (structures). Goaf subsidence disaster is one of the main forms of geological disasters that cause l...

Claims

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Application Information

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IPC IPC(8): F17D5/00G01B11/16G01B11/02
Inventor 吴张中马云宾谭东杰韩冰荆宏远郝建斌蔡永军刘建平
Owner PIPECHINA SOUTH CHINA CO
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