Method for evaluating soil corrosion characteristics of buried pipeline

Abstract

The invention discloses a method for evaluating soil corrosion characteristics of a buried pipeline. The method comprises the following steps: soil corrosion factor testing, buried test piece/pipe section corrosion characteristic analysis and corrosion rate calculation, soil corrosion key factor analysis, soil physicochemical property and corrosion rate relation model establishment, pipeline safety evaluation and residual life prediction. The method has the beneficial effects that: under the condition that the pipeline cannot be subjected to excavation external detection and internal detection, under the condition that a damage state of an anti-corrosion layer of the pipeline is known, the corrosion rate at the damage point of the anti-corrosion layer of the pipeline is determined by combining with the soil physicochemical property testing; the most dangerous section and a high consequence area are determined, the residual life of the pipeline is predicted, and the method has very important practical significance in safety evaluation and integrity management of the pipeline.

Description

technical field [0001] The invention belongs to the field of analysis of oil field related technologies, and in particular relates to an evaluation method for soil corrosion characteristics of buried pipelines. Background technique [0002] For the evaluation method of soil corrosion characteristics of buried pipelines, my country promulgated GB / T 19285-2014 "Engineering Inspection of Buried Steel Pipeline Corrosion". This standard gives 8 factors for soil corrosion investigation: soil resistivity, pipeline natural corrosion potential, redox potential, soil pH value, soil texture, soil water content, soil salt content, soil Cl- content, and The different numerical ranges of each value are scored, and the corrosion level of the soil is determined by calculating the total score. [0003] However, due to the complexity of the soil corrosion environment, the above indicators cannot represent the actual soil corrosion on the one hand, and cannot clarify the corrosion characteris...

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Problems solved by technology

[0003] However, due to the complexity of the soil corrosion environment, the above indicators cannot represent the actual soil corrosion on the one hand, and cannot clarify the corrosion characteristics and main influencing factors of the soil on the pipeline; The corrosion rate of the area, especially in the soil area rich in microorganisms, the corrosion of soil is mainly affected by the activities of microorganisms, and the above evaluation method is no longer applicable

[0004] At present, many scholars and technicians have done some relevant explorations on the evaluation of soil corrosion, but the key factors of soil corrosion, and the relationship between pitting corrosion / general corrosion rate, have not been carried out.

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