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Method for rapidly screening corrosion inhibitor under high-salinity water condition

A technology with high salinity and screening method, applied in the direction of electrochemical variables of materials, etc., can solve the problems such as no screening and evaluation method of corrosion inhibitor, limited application range, inability to meet the complexity of actual working conditions, etc., and achieve rapid screening and delay. Corrosion, excellent protective effect

Inactive Publication Date: 2021-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this scheme still cannot meet the complexity of actual working conditions, and the scope of application is limited
[0004] Most of the research in the prior art is on the formulation composition of corrosion inhibitors. The evaluation method is still based on the average corrosion rate and corrosion inhibition rate, and no screening evaluation method for corrosion inhibitors for pitting corrosion is given.

Method used

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  • Method for rapidly screening corrosion inhibitor under high-salinity water condition
  • Method for rapidly screening corrosion inhibitor under high-salinity water condition
  • Method for rapidly screening corrosion inhibitor under high-salinity water condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: Compatibility evaluation is carried out to the corrosion inhibitor to be adopted:

[0055] The screening process provided in this embodiment can efficiently and quickly screen out corrosion inhibitors that meet the on-site anti-corrosion requirements.

[0056] The specific screening steps are as follows:

[0057] Step 1: Collect the corrosion condition parameters of pipelines in the oilfield production and transportation system: chloride ion content 123000mg / L, CO 2 Partial pressure 0.25MPa, H 2 S partial pressure is 0.0132MPa, gathering temperature is 50℃, flow velocity is 1.0m / s, the phase distribution in the gathering pipeline is gas phase, gas-liquid interface and liquid phase distribution, and the oil-water ratio is 3:2;

[0058] Step 2: According to the parameters of oil field corrosion conditions, the 10 kinds of corrosion inhibitors collected in accordance with the corrosion conditions are sequentially numbered as No. 1-10;

[0059] Step 3: Eval...

Embodiment 2

[0063] Example 2: Using electrochemical corrosion to detect point defect concentration

[0064] Step 4: Use the electrochemical corrosion detection method to evaluate the corrosion inhibitor with good compatibility in step (3), and screen out the corrosion inhibitor resistant to pitting corrosion. The experimental steps are as follows:

[0065] a. Test and calculation of point defect concentration: connect the cleaned, polished and passivated pipeline steel sample (50×25×2mm) to the electrode, and immerse it in the medium solution of the simulated gathering and transportation system for 30 minutes to obtain a stable open circuit potential; The chemical workstation measures the change of passive film impedance with the potential, the scanning range is -0.1~0.6V, the potential increment is 0.01V, and the frequency is 1000Hz; calculate the point defect concentration of the passive film: draw the Mott-Schottky curve, according to the formula (1-1), calculate the point defect conce...

Embodiment 3

[0068] Embodiment 3: pitting probability test

[0069] b. Pitting probability test: Divide the pipeline steel sample in step a into 25 areas. Tested on a large-scale scanning Kelvin probe system test platform, the distance between the probe and the sample surface is controlled at 100 μm. The frequency of the probe parameters is 80Hz, and the amplitude is 30μm. Select the surface scanning mode to scan any area according to the principle of "from bottom to top, from left to right". Taking the midpoint of the area as the center, the length and width of the scanning area are 2mm and 1mm respectively, and the scanning step is selected as 200μm. After the test, a three-dimensional map of the potential distribution is obtained. If the difference between the lowest potential of the area and the highest potential of the area is greater than 200mV, it is determined that the area will be When pitting occurs, record the number of regions where pitting occurs on the test steel sheet as m...

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Abstract

The invention provides a method for rapidly screening a corrosion inhibitor under a high-salinity water condition, which comprises the following steps of: S1, collecting corrosion working condition parameters of a gathering and transportation system, and numbering the corrosion inhibitors; s2, carrying out compatibility evaluation on a corrosion inhibitor to be adopted; s3, adopting electrochemical corrosion to detect the defect concentration of the points; s4, testing the pitting corrosion probability; s5, analyzing the occurrence probability of different corrosion depths by adopting a three-dimensional image; and S6, processing a result. According to the screening process provided by the invention, the corrosion inhibitor meeting the on-site anti-corrosion requirement can be efficiently and quickly screened out.

Description

technical field [0001] The invention relates to the field of oil field natural gas industry, in particular to a high salinity, high Cl - , high H 2 S and CO 2 Rapid screening method for corrosion inhibitors in oilfield pipelines. Background technique [0002] Pipeline damage in the process of oil and gas gathering and transportation seriously threatens the safe production of oil fields, and the corrosion of oil and gas pipelines caused by corrosive substances contained in oil and gas is the main culprit of pipeline damage, so the anticorrosion of oil and gas pipelines must be paid attention to. As one of the main measures to inhibit corrosion damage of oil and gas pipelines, corrosion inhibitors have been widely used due to their unique advantages. In the process of associated gas production and gathering in oilfields, because of the high content of corrosive components in the produced material, it is often several times stronger than ordinary liquid phase corrosion. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 赵海洋高秋英杨祖国曾文广孙海礁胡广强张江江刘强叶帆彭明旺应海玲杨旭马智华
Owner CHINA PETROLEUM & CHEM CORP
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