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Detection method for cathode protection of directionally drilled and crossed pipeline

A directional drilling penetration and cathodic protection technology, which is applied in the field of construction equipment protection, can solve problems such as failure to meet protection requirements, achieve the effects of improving the cathodic protection system, ensuring safe operation of pipelines, and meeting the cathodic protection criteria

Active Publication Date: 2015-06-03
SHENZHEN GAS CORP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a detection method for directional drilling through pipeline cathodic protection in view of the defect that the protection requirements cannot be met when the external anti-corrosion layer and the sacrificial anode cathodic protection are used to jointly protect the pipeline in the above-mentioned prior art

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  • Detection method for cathode protection of directionally drilled and crossed pipeline
  • Detection method for cathode protection of directionally drilled and crossed pipeline
  • Detection method for cathode protection of directionally drilled and crossed pipeline

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[0025] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The invention provides a detection method for cathodic protection of directional drilling through pipelines, such as figure 1 As shown, the method includes the following steps:

[0027] S1. Using the boundary element method to establish a numerical model of stray current disturbance in the subway and a numerical model of the cathodic protection system;

[0028] S2. Obtain the data information of the burial depth, pipeline diameter, distribution trend and soil resistivity of the sacrificial anode in the directional drilling crossing pipeline;

[0029] S3. Substituting the data inform...

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Abstract

The invention provides a detection method for cathode protection of a directionally drilled and crossed pipeline. According to the detection method, a numerical model of a metro stray current interference and cathode protection system is established by virtue of a boundary element method, the influences of the potential and the electric current density of a magnesium positive electrode, the value of stray current and the parallel length of a metro on a crossed-section cathode protection system are simulated, and thus a preliminary scheme for improving the directionally drilled crossed-section cathode protection system can be correspondingly proposed, so that the cathode protection system of the directionally drilled and crossed pipeline is improved, a cathode protection rule is met, and the safety operation of the pipeline is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of protection of construction equipment, in particular to a detection method for cathodic protection of pipelines crossed by directional drilling. Background technique [0002] In the prior art, the combined protection of external anti-corrosion layer and sacrificial anode cathodic protection is often used for directional drilling of urban gas pipelines. Due to the long crossing distance and the limited protection distance of sacrificial anodes, the cathodic protection effect may not meet the national standards, especially under the interference of dynamic DC stray currents, the cathodic protection system is prone to failure or insufficient protection, which lays a great foundation for the safe operation of the pipeline. Hidden danger, once the pipeline crossing section is corroded and perforated, it will be difficult to deal with and the consequences will be serious. [0003] Therefore, there are defects in the prio...

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Application Information

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IPC IPC(8): C23F13/22
Inventor 周吉祥
Owner SHENZHEN GAS CORP
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