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An online corrosion evaluation device

A corrosion evaluation and corrosion testing technology, applied in measuring devices, by removing certain components, weighing, instruments, etc., can solve the problems of inconvenient installation and disassembly, difficulty in simulating the flow state, closing, etc., to achieve convenient disassembly, The effect of convenient construction and simple maintenance

Active Publication Date: 2021-11-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This test method has two shortcomings: first, it is difficult to simulate the actual flow state, and the flow state near the coupon is quite different from the actual state; second, it is very inconvenient to install and disassemble, because it is necessary to put the coupon In the interior, it is often necessary to disassemble the equipment or transform the pipeline, and make a special fixing device. At the same time, it is necessary to close the equipment or pipeline process when installing or removing the hanging piece

Method used

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Examples

Experimental program
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Embodiment 1

[0047] like Figure 5 As shown, the online corrosion evaluation device provided in this embodiment includes a main pipeline 101, a branch pipeline 102 communicated with the main pipeline 101, and a test pipeline 103 communicated with the branch pipeline 102; the branch pipeline 102 communicates with the test pipeline 103 to form an intersection point; the sub-pipeline 102 is located downstream of the intersection point and is provided with a sampling puppet 104; the test pipeline 103 is provided with a flowmeter 105 and an online corrosion test puppet structure 300 in sequence according to the direction of fluid flow.

[0048] The online corrosion evaluation device is an external online evaluation device, which can fully simulate the actual environment by connecting to the sampling port of the pipeline or equipment, and complete the evaluation of corrosion-related data.

Embodiment 2

[0050] On the basis of Embodiment 1, a pressure gauge 106 for measuring the fluid pressure in the pipeline is provided on the pipeline between the flowmeter 105 and the corrosion test nipple structure.

[0051] Specifically, the branch pipeline 102 is provided with a first cut-off valve 201 , and the first cut-off valve 201 is located between the intersection point and the sampling nipple 104 . The test pipeline 103 is provided with a second shut-off valve 202 and a regulating valve 203 , the second shut-off valve 202 is located between the intersection point and the flow meter 105 , and the regulating valve 203 is located downstream of the on-line corrosion test nipple structure 300 .

[0052] The on-line corrosion evaluation device of the present embodiment comprises a main pipe 101, a branch pipe 102 communicated with the main pipe 101, and a test pipe 103 communicated with the branch pipe 102; the branch pipe 102 communicates with the test pipe 103 to form an intersection; ...

Embodiment 3

[0055] On the basis of Example 1, such as Figure 1-4 As shown, it is a schematic diagram of the corresponding structure of the on-line corrosion test pup structure 300 provided in this embodiment. The on-line corrosion test pup structure 300 is sequentially provided with a corrosion test standard ring 305, a polytetrafluoroethylene sleeve 303 and Stainless steel outer cylinder; the corrosion test standard ring 305 is set to be multi-section, and the multi-section corrosion test standard ring 305 is coaxially connected in series, and a tetrafluororubber gasket 306 for sealing is arranged between every two adjacent corrosion test standard rings 305; The polytetrafluoroethylene sleeve 303 is sleeved on the outer periphery of the multi-section corrosion test standard ring 305; the stainless steel outer cylinder is sleeved on the outer periphery of the polytetrafluoroethylene sleeve 303; the outer wall of the polytetrafluoroethylene sleeve 303 is provided with a conductive shrapnel...

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Abstract

The invention provides an online corrosion evaluation device, which includes a main pipe, a branch pipe connected with the main pipe, and a test pipe connected with the branch pipe; the branch pipe is connected with the test pipe to form a junction, and the branch pipe is located at the A sampling nipple is arranged downstream of the intersection point; a flow meter and an online corrosion testing nipple structure are sequentially arranged on the test pipeline according to the direction of fluid flow. The structure of the on-line corrosion test pup joint includes a corrosion test standard ring, a polytetrafluoroethylene sleeve and a stainless steel outer cylinder sequentially arranged from the inside to the outside, the outer wall of the polytetrafluoroethylene sleeve is provided with conductive shrapnel, and the corrosion test standard ring Potential conduction with the stainless steel outer cylinder through the conductive shrapnel. The external test sub-joint is directly connected to the sampling port of the target to be tested, which can be basically consistent with the state of the internal flow field of the target to be tested, which can make the test state more consistent with the actual working conditions of the target to be tested, and the evaluation is more accurate. It is easy to install and can be used repeatedly.

Description

technical field [0001] The invention relates to the technical field of water injection system maintenance, in particular to an online corrosion evaluation device. Background technique [0002] At present, part of the surface gathering, transportation and water injection systems in the oil field are severely corroded, resulting in an increase in the frequency of failures and maintenance costs year by year. Accurate evaluation of corrosion of equipment and pipelines directly affects process design, life prediction and safe operation. Monitoring and evaluating equipment and pipeline corrosion has always been a major problem. [0003] The main way to evaluate the corrosion of equipment and pipelines is to adopt the coupon test method, that is, to use the same material as the tested equipment or pipeline to make a thin sheet-shaped standard coupon, and fix the coupon in the flow field in the equipment or pipe , take out the coupon regularly, and measure the corrosion amount of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G01N5/04
CPCG01N5/04G01N33/00
Inventor 王涛王伟华张文来刘秀华刘向伟周亮亮
Owner PETROCHINA CO LTD