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Corrosion inhibitor evaluation method for deepwater natural gas pipeline under high gas phase flow rate working condition

A natural gas pipeline and evaluation method technology, applied in the field of deepwater natural gas pipeline transportation, can solve the problems of inaccurate evaluation of corrosion inhibitor anticorrosion effect and inability to form an evaluation method, and achieve the effect of accurate and reasonable evaluation experiment of corrosion inhibitor and scientific and accurate formulation

Pending Publication Date: 2021-12-03
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

[0003] The purpose of the present invention is to provide a corrosion inhibitor evaluation method for deep-water natural gas pipelines under high gas phase flow rate conditions, to solve the problem that the evaluation of the anticorrosion effect of the existing corrosion inhibitors is inaccurate and cannot form an effective evaluation method question

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  • Corrosion inhibitor evaluation method for deepwater natural gas pipeline under high gas phase flow rate working condition
  • Corrosion inhibitor evaluation method for deepwater natural gas pipeline under high gas phase flow rate working condition
  • Corrosion inhibitor evaluation method for deepwater natural gas pipeline under high gas phase flow rate working condition

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Embodiment 1

[0050] Embodiment 1 provides a corrosion inhibitor evaluation method for deep-water natural gas pipelines under high gas phase flow rate conditions, comprising the following steps:

[0051] Step A: Carry out the investigation of the service environment of deep-water natural gas pipelines. The investigation objects include the material and diameter of submarine pipelines, the composition of deep-water water quality, the delivery temperature, delivery pressure, gas flow rate, liquid holdup, CO 2 content, H 2 S content, organic acid content, and type of corrosion inhibitor;

[0052] Taking a natural gas pipeline in a certain place in the South my country Sea as an example, the submarine pipeline uses X65 steel pipes with a diameter of 100mm; the deep water quality composition is: Cl - The content is 1000mg / L, Ca 2+ The content is 300mg / L, HCO 3 - The content is 50mg / L, Na + : 323mg / L; The natural gas transported in the submarine pipeline has a delivery temperature of 60°C, a...

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Abstract

The invention discloses a corrosion inhibitor evaluation method for a deepwater natural gas pipeline under a high gas phase flow rate working condition. The method comprises the following steps: investigating a service environment of the deepwater natural gas pipeline; calculating the shearing force of the fluid on the inner wall surface of the submarine pipeline; selecting a corrosion inhibition efficiency evaluation test method; calculating test parameters of the corrosion inhibition efficiency evaluation test method; performing multiple groups of corrosion inhibitor evaluation experiments under different wall surface shear forces and different corrosion inhibitor filling concentrations; drawing a corrosion inhibitor critical filling concentration map; and determining the filling concentration of the corrosion inhibitor under different working conditions. The method for evaluating the corrosion inhibitor of the deepwater natural gas pipeline under the working condition of the high gas phase flow velocity is accurate and effective, scientific and accurate in formulation, beneficial to screening of the efficient corrosion inhibitor and determination of the accurate, economical and safe corrosion inhibitor filling concentration, has important significance, and is one of important links for deepwater oil and gas development and safe conveying guarantee.

Description

technical field [0001] The invention relates to the technical field of deep-water natural gas pipeline transportation, in particular to a corrosion inhibitor evaluation method for deep-water natural gas pipelines under the condition of high gas phase flow velocity. Background technique [0002] In recent years, the demand for natural gas has grown strongly. The development of marine natural gas resources, especially the development of deep sea natural gas resources, has become an inevitable trend of energy development today. my country's deep-sea natural gas field CO 2 There are many oil and gas blocks with high oil and gas content, and the failure of submarine pipeline leakage due to oil and gas medium corrosion occurs frequently during the mining process, and each occurrence often causes catastrophic consequences such as major economic losses, casualties, and environmental pollution. It has gradually become one of the factors restricting the development of deep-sea natur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 李清平姚海元朱海山王贝王清王赟张雷郑利军常炜曹静贾旭路宏胡丽华
Owner CHINA NAT OFFSHORE OIL CORP
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