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A low water content, supercritical or dense phase carbon dioxide corrosion simulation device and its use and application

A liquid carbon dioxide and supercritical technology, applied in the field of test simulation, can solve problems such as outstanding corrosion problems, difficult problems in anti-corrosion and ground gathering and transportation technology, and inability to simulate and analyze problems

Active Publication Date: 2021-11-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to the lack of effective CO 2 Using a comprehensive set of technologies and practical experience, CO 2 The technical problems of anti-corrosion and ground gathering and transportation in comprehensive utilization are still difficult to solve, such as CO 2 The corrosion problem in the flooding process is prominent; CO 2 The experiment of gas still adopts the experimental equipment of conventional gas
[0003] Chinese patent CN201110233840.9 discloses a carbon dioxide corrosion simulation test device and test method, but the technical solution is only for high CO 2 content of corrosion simulation test requirements, can not be aimed at ultra-low water content, dense phase or supercritical CO 2 Corrosion simulation analysis cannot be carried out in oil and gas fields 2 High pressure, low water content, dense phase or supercritical CO 2 Accurate assessment of corrosion risk under complex service conditions

Method used

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  • A low water content, supercritical or dense phase carbon dioxide corrosion simulation device and its use and application
  • A low water content, supercritical or dense phase carbon dioxide corrosion simulation device and its use and application
  • A low water content, supercritical or dense phase carbon dioxide corrosion simulation device and its use and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Take the X60 steel sheet as the test piece to be tested, complete the clamping of the test piece to be tested and seal the corrosion test reactor 2-1;

[0080] The moisture content required for the design test is 0.07wt.%. The internal volume of the corrosion test reactor 2-1 is 3L. The water content required under the moisture content condition is calculated to be 1.52g, and the required water volume is added to the water injection chamber 1- according to the calculation result. 1;

[0081] With the first valve 3 closed, the water injection chamber 1-1 is deoxygenated for 24 hours, and the corrosion test reactor 2-1 is subjected to CO 2 Deoxygenation 12h and N 2 Deoxygenation 24h;

[0082] Open the first valve 3, and pressurize the water injection chamber 1-1 under the pressure condition of 0.6 MPa for 6 hours through the first liquid carbon dioxide storage tank 1-2, so that the water in the water injection chamber 1-1 enters the corrosion test reaction kettle 2-1 A...

Embodiment 2

[0089] The water content required for the design test is 3wt.%, and the water content required under the water content condition is calculated to be 65.20g. The remaining conditions and operations are the same as in Example 1, and the CO 2 Corrosion simulation testing.

[0090] to CO 2 The test pieces obtained from the corrosion simulation test were observed macroscopically, and the photos of the obtained objects are shown in Figure 4 .

[0091] to CO 2 The test pieces obtained from the corrosion simulation test were pickled, and the pickling conditions were the same as those in Example 1. Macroscopically observe the test piece after pickling, and the obtained physical photos are shown in Figure 5 .

[0092] Depend on Figure 4 and Figure 5 It can be seen that the dense phase CO with higher water content (3wt.%) 2 Under these conditions, the X60 steel was severely corroded, and after pickling, there were a large number of local circular pits distributed on the surfa...

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Abstract

The invention belongs to the technical field of test simulation, in particular to a low water content, supercritical or dense phase CO 2 Apparatus for corrosion simulation and its method of use and application. The present invention provides a low water content, supercritical or dense phase CO 2 The device for corrosion simulation includes an independent water injection unit connected in sequence, a corrosion test reaction unit, and a first valve arranged on the pipelines of the independent water injection unit and the corrosion test reaction unit; the independent water injection unit includes a first liquid carbon dioxide storage tank, The water injection chamber whose air inlet communicates with the outlet of the first liquid carbon dioxide storage tank and the first liquid-sealed water tank whose air inlet communicates with the outlet of the water injection chamber, the first liquid-sealed water tank and the water injection chamber A second valve is arranged on the communicating pipeline; the corrosion test reaction unit includes a second liquid-sealed water tank connected in sequence, a corrosion test reaction kettle, a booster pump, and a second liquid carbon dioxide storage tank communicated with the inlet of the booster pump. tanks and liquid nitrogen storage tanks.

Description

technical field [0001] The invention belongs to the technical field of test simulation, in particular to a low water content, supercritical or dense phase CO 2 Apparatus for corrosion simulation and its method of use and application. Background technique [0002] CO 2 It is a very efficient oil displacement agent, especially in the development of low-permeability and difficult-to-use reserves, and has more obvious technical advantages than water flooding. But due to the lack of effective CO 2 Using a comprehensive set of technologies and practical experience, CO 2 The technical problems of anti-corrosion and ground gathering and transportation in comprehensive utilization are still difficult to solve, such as CO 2 The corrosion problem in the flooding process is prominent; CO 2 The experiment of gas still adopts the experimental equipment of conventional gas. [0003] Chinese patent CN201110233840.9 discloses a carbon dioxide corrosion simulation test device and test m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 朱金阳张玉楠花勇李大朋张雷
Owner UNIV OF SCI & TECH BEIJING