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Calculation method for cathodic protection length of parallel pipelines under forced current system

A technology of forced current and cathodic protection, which is applied in calculation, computer-aided design, complex mathematical operation, etc., can solve the problem of not giving the protection length of multiple parallel pipelines, and achieve the effect of scientific evaluation results.

Active Publication Date: 2018-09-28
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

According to the national standard GB / T21448-2008 "Technical Specifications for Buried Steel Pipeline Cathodic Protection", the specification only calculates the cathodic protection length of a single pipeline under the forced current system, and does not give relevant calculation methods for the protection length of multiple parallel pipelines

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  • Calculation method for cathodic protection length of parallel pipelines under forced current system
  • Calculation method for cathodic protection length of parallel pipelines under forced current system
  • Calculation method for cathodic protection length of parallel pipelines under forced current system

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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] A calculation method for cathodic protection length of parallel pipelines under forced current system, such as figure 1 shown, including the following steps:

[0025] Step 1, establish a multi-pipeline polarization model under the forced current system for the diameter, wall thickness and anti-corrosion layer of each pipeline of N parallel pipelines buried underground, and the multi-pipeline polarization model has the following definition: N parallel pipelines The pipe diameter, wall thickness and anti-corrosion layer are all different, and N is an integer greater than or equal to 2;

[00...

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Abstract

The invention relates to the technical field of oil and gas pipeline corrosion prevention, in particular to a calculation method for a cathodic protection length of parallel pipelines under a forced current system. The calculation method for the cathodic protection length of the parallel pipelines under the forced current system comprises the following steps of 1, building a model under the forcedcurrent system according to a diameter, a wall thickness and an anti-corrosive coating of the N parallel pipelines; 2, determining potential fall of delta x pipeline sections, and establishing a differential equation; 3, integrating the differential equation established based on the potential fall of the delta x pipeline sections to obtain voltage drop, pipeline parameters and length; and 4, according to an integral equation of the voltage drop, the pipeline parameters and the length, obtaining the protection length of the N parallel pipelines. The mutual influence of the pipelines is considered in the process of obtaining the cathodic protection length of the parallel pipelines, so that an evaluation result is more scientific, accurate and reasonable.

Description

technical field [0001] The invention relates to the technical field of anticorrosion of oil and gas pipelines, in particular to a method for calculating cathodic protection lengths of parallel pipelines under a forced current system. Background technique [0002] With the vigorous development of China's pipeline industry, in order to reduce the one-time cost of pipeline construction, more and more pipelines are laid in the same ditch. At the same time, due to terrain restrictions, some pipelines are laid at a small distance. Pipes cause corrosion. Therefore, combined cathodic protection is often used in the cathodic protection scheme. For long-distance pipelines with long distances, forced current is often used for cathodic protection of pipelines. According to the national standard GB / T21448-2008 "Technical Specifications for Buried Steel Pipeline Cathodic Protection", the specification only calculates the cathodic protection length of a single pipeline under the forced c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50C23F13/02G06F17/11
CPCG06F17/11C23F13/02C23F2213/32G06F2113/14G06F30/20
Inventor 杨昊范琦耿万鹏罗赣李继果邓小涛胡健王福彬苗榆彬李梅玉刘军邓乔宇
Owner BC P INC CHINA NAT PETROLEUM CORP
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