Pipeline protection effect detection device and detection method

Abstract

The embodiment of the invention provides a pipeline protection effect detection device and method, and relates to the technical field of pipeline protection. The detection device comprises testing equipment; a connecting assembly, of which one end is connected to the testing equipment and the other end is used for extending to the position below the earth surface; a supporting piece which is used for fixing and supporting part of the connecting assembly; a cover plate which is arranged at the top end of the supporting piece in a sealing mode. and a plurality of probe assemblies which are respectively arranged at different height positions of the supporting piece and are connected to the connecting assembly, each probe assembly comprising a plurality of test connecting lines. According to the pipeline protection effect detection device, more abundant data support can be obtained through reference electrodes made of two different materials, and the requirement of a user for pipeline protection effectiveness evaluation is met.

Description

technical field [0001] The invention relates to the technical field of pipeline protection, in particular to a pipeline protection effect detection device and detection method. Background technique [0002] Directional drilling is a non-excavation technology that does not damage the stratum structure, occupies less land, is not affected by seasons, and has a short construction period. However, pipelines constructed by directional drilling technology have long been in deep underground or underwater service. Due to difficulties in repair and replacement, routine measurement and evaluation of the effectiveness of cathodic protection cannot be carried out on the directional drilling crossing section in service. If directional drilling cannot be mastered With the anti-corrosion coating and cathodic protection level outside the crossing section, the long-term corrosion is very likely to cause corrosion leakage and cause production safety accidents. Therefore, timely evaluation of...

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Problems solved by technology

[0003] At present, the evaluation methods for the protection effect of directional drilling crossing section mainly include current-potential method, PCM current decay method and numerical simulation method. The standard NACETM0102 uses the current-potential method to evaluate the quality of the anti-corrosion layer in the crossing section, but this method is only applicable to construction. Pipelines that have not been connected to other pipe sections after completion cannot be measured for pipes that have been connected; the PCM current decay method detection instrument can only test the protection potential at both ends of the crossing section, but cannot evaluate the cathodic protection effectiveness of the crossing section; the numerical simulation method can Evaluate the change law between the cathodic protection and the defect rate of the pipeline crossing section, but the boundary conditions of the numerical calculation are artificially stipulated, which is different from the actual boundary conditions of the crossing section. It can be found that domestic and foreign cathodic protection evaluation It is still basically in the detection and evaluation stage of the anti-corrosion layer. The cathodic protection potential distribution of the pipeline crossing section has only been explored in numerical simulation, and the accuracy of the numerical simulation calculation results needs to be further verified. Equipment and methods for evaluation of protection effectiveness

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