Frozen soil area buried oil and gas pipeline multi-field coupling monitoring and early warning system

Abstract

The invention discloses a frozen soil area buried oil and gas pipeline multi-field coupling monitoring and early warning system. The system comprises a multi-field coupling monitoring subsystem arranged on site and a monitoring and early warning subsystem arranged on a server side. The multi-field coupling monitoring subsystem comprises a pipeline strain monitoring device and a pipe periphery soiltemperature monitoring device. The pipeline strain monitoring device comprises a strain sensor, a strain sensor protection cover, a monitoring cross section protector, a leading-out cable and a cableprotection pipe. The strain sensor needs to be installed on the surface of a pipeline steel body, and the strain sensor is protected by the strain sensor protection cover; the protection cover is completely covered by the viscoelastic body paste, so that waterproof and moistureproof effects are achieved, and the service life of the sensor is prolonged. The monitoring and early warning system is safe and reliable, long-term and stable operation of the monitoring device can be guaranteed, continuous and effective monitoring data are provided, early warning information is issued in time based onthe monitoring data, and pipeline accidents under the influence of frost heaving and thaw collapse are prevented.

Description

technical field [0001] The invention relates to the technical field of oil and gas pipelines and frozen soil monitoring, in particular to a multi-field coupling monitoring and early warning system for buried oil and gas pipelines in frozen soil areas. Background technique [0002] Permafrost refers to the soil or rock layer with a temperature lower than 0°C and contains ice. In my country, permafrost is mainly distributed in high-latitude regions in the northeast and high-altitude regions in the northwest. Taking the Greater Khingan Mountains in Northeast China as an example, the average minimum temperature in winter is below -25°C, and the extreme low temperature is even below -50°C, which provides good conditions for the occurrence of permafrost. When the oil and gas pipeline passes through the permafrost area, affected by the construction and operation of the pipeline, the surface coverage conditions along the pipeline are destroyed. In particular, the pipeline transporti...

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Problems solved by technology

[0004] In order to solve the current situation in the existing monitoring technology that the monitoring factors are single, the interaction between pipe and soil cannot be effectively reflected, the monitoring device is easily damaged and difficult to repair in situ, and the monitoring indicators cannot be directly used to evaluate whether the pipeline is safe or not, the present invention provides a It can be used for a long-term coupling monitoring and early warning system for monitoring the strain of the pipeline body and the temperature of the frozen soil around the pipeline in the field environment. By monitoring the microscopic deformation (strain) of the pipeline body and the temperature of the wider soil around the pipeline for a long time, it pays attention to the interaction between the frozen soil and the pipeline , accurately grasp the influence of frost heaving and thawing of permafrost on the mechanical properties of the pipeline, and the temperature distribution characteristics of the soil around the pipeline when the pipeline is transported at positive temperature, and establish a monitoring and early warning system for the intrinsic safety of the pipeline to realize automatic collection of monitoring data, remote transmission, automatic Analysis and forecast and early warning

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