Oil-gas field ground pipeline internal corrosion risk evaluation method

A risk assessment, oil and gas field technology, applied in the direction of instruments, data processing applications, forecasting, etc., can solve the problems of not taking into account the risk of leakage safety, environmental damage, high corrosion risk, and low reliability

Active Publication Date: 2019-10-01
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

[0005] (2) The internal corrosion direct assessment method believes that the corrosion risk of the most prone to liquid accumulation is greater, but it is not suitable for water-containing crude oil pipelines (water content> 5%);
[0006] (3) The Kent scoring method comprehensively considers internal and external corrosion, third-party damage, design, misoperation, etc., and the reliability is not high because it is a method of scoring by experts;
[0007] (4) The method of grading the risk of pipelines according to the size of the corrosion rate comprehensively considers the effects of various corrosive ions on the pipeline, which better reflects the actual situation of the corrosion environment in the pipeline, but does not take into account the risk of leakage safety and environmental damage

Method used

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  • Oil-gas field ground pipeline internal corrosion risk evaluation method
  • Oil-gas field ground pipeline internal corrosion risk evaluation method
  • Oil-gas field ground pipeline internal corrosion risk evaluation method

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Experimental program
Comparison scheme
Effect test

Embodiment

[0141] (1) Block division of oil and gas fields

[0142] The selected oilfield in western China has a complex corrosion environment, and the medium contains H 2 S, CO 2 and other acid gases, according to the H in the pipeline 2 S and CO 2 The content of the oil field is divided into 4 blocks, which are high H content 2 S block, high CO content 2 blocks, low-acid blocks and high-acid blocks.

[0143] (2) Corrosion rate prediction

[0144] The values ​​of the main influencing factors and the corresponding corrosion rate values ​​of the pipelines in the four blocks were collected respectively. The data of five pipelines were collected in each block, and the predicted corrosion rate was obtained through calculation. 10%, as shown in Table 2-1 to Table 2-3.

[0145] Table 2-1 Results of corrosion risk assessment

[0146]

[0147]

[0148] Table 2-2 Results of corrosion risk assessment

[0149]

[0150]

[0151] Table 2-3 Results of corrosion risk assessment

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Abstract

The invention discloses an oil-gas field ground pipeline internal corrosion risk evaluation method, capable of performing graded evaluation on the internal corrosion risk of a pipeline, identifying anoil field high-risk pipeline, and mastering the operation state of the high-risk pipeline in real time. The predicted value of the corrosion rate is used as the risk occurrence possibility while theconveying medium, the crossing environment, the H2S content, the population quantity and the like are taken as consequence severity of risk occurrence, so that the corrosion risk evaluation of the pipeline completely comprises the probability of failure occurrence and the severity of failure occurrence, and the accuracy and reliability of the corrosion risk evaluation of the pipeline are effectively improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of oil pipeline safety risk assessment and relates to a method for internal corrosion risk assessment of surface pipelines in oil and gas fields. 【Background technique】 [0002] Corrosion not only affects the normal production and operation of pipelines, but also causes energy waste and economic losses. At the same time, due to the characteristics of flammability, explosion and easy diffusion of oil and gas media, it will also cause environmental pollution and safety accidents. Since pipeline corrosion cannot be predicted in advance, the cost of emergency maintenance and pollution control will rise sharply, which will seriously affect the safe production, development efficiency, ecological environmental protection and corporate image of oil and gas fields. The corrosion risk prediction of in-service pipelines or new pipelines can realize early identification and focus on high-risk pipelines, guide the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q10/04G06Q50/02
CPCG06Q10/0635G06Q10/04G06Q50/02
Inventor 宋成立羊东明李磊高秋英袁军涛肖雯雯
Owner BC P INC CHINA NAT PETROLEUM CORP
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