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Indoor evaluation device and method for sacrificial anode material

A sacrificial anode and indoor evaluation technology, which is applied in the field of oil and gas field corrosion and protection, can solve the problems of great difficulty, limited range of electromagnetic action, and difficult protection potential, so as to achieve the effect of accurate potential and guaranteed relative position

Active Publication Date: 2021-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Due to the limited range of electromagnetic action of the sacrificial anode in the limited space of the oil well casing, the depth of the oil well casing is more than a thousand meters underground, and the sacrificial anode is measured in the casing There are natural difficulties in the protection potential of the casing. It is feasible to use the method of detecting the distribution potential of the outer wall of the casing by referring to the reference electrode fixed on the tubing to measure the potential of different positions on the inner wall of the casing. It is impossible to know how the anodes are reasonably distributed in the casing, so that the anode distribution cannot be reasonably determined

Method used

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  • Indoor evaluation device and method for sacrificial anode material
  • Indoor evaluation device and method for sacrificial anode material
  • Indoor evaluation device and method for sacrificial anode material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0044] Well 27-** in an oilfield city, the well depth is 1860m, ​​the casing specification is 139.7mm (outer diameter)×7.72mm (wall thickness), and the tubing specification is 73.0mm (outer diameter)×5.50mm (wall thickness). MIT+MTT engineering logging shows that the well corrodes severely near 1420m-1725m. In order to prolong the production cycle of the oil well and slow down the casing corrosion damage, it is decided to implement sacrificial anode sub-joint protection at the position of 1420m-1725m in the well. In order to improve the economy and ensure the effectiveness, and achieve the best protection effect with the least amount of sacrificial anode short joints, it is necessary to clarify the maximum protection distance L and corresponding protection potential V of a single sacrificial anode short joint. The number of sacrificial anode short joints required for this well = [(1725m-1420m) / L].

[0045] To this end, this embodiment provides a figure 1 The sacrificial anode...

Embodiment 2

[0062] Example 1 can only evaluate one sacrificial anode sample at a time. In order to improve the evaluation efficiency, four examples 1 can be connected in parallel for simultaneous evaluation. The specific test plan is shown in Table 3, the test line connection port layout is shown in Table 4, the test materials and equipment are shown in Table 5, and the others are the same as in Example 1.

[0063] table 3

[0064]

[0065] Table 4

[0066]

[0067] table 5

[0068]

[0069] The indoor evaluation device for sacrificial anode materials of the present invention simulates the actual working conditions (temperature, salinity, and integrity rate of anti-corrosion coating) of oil and gas wells through a full-scale model, and tests the corresponding protection by applying a constant and continuous protection current to the system. The change law of potential with time, draw the protection potential and protection distance relationship curve to evaluate the protection ...

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Abstract

The invention discloses an indoor evaluation device and method for a sacrificial anode material. The device comprises a casing pipe nipple, an oil pipe nipple, test electrodes, reference electrodes, a sacrificial anode nipple, voltmeters, ampere meters, a temperature controller, a heater, a sealed fixing base and a multi-channel data recorder; and the sealed fixing base is provided with the casing pipe nipple, the oil pipe nipple, a sacrificial anode, the test electrodes and the reference electrodes in sequence, and the ampere meters and the voltmeters are externally connected to the sacrificial anode, so that the indoor evaluation device for the sacrificial anode is formed. The indoor evaluation device simulates the actual working conditions (such as temperature, mineralization degree and anti-corrosion coating perfectness ratio) of an oil and gas well shaft through a full-size model, by applying constant and continuous protection currents to a system, the change rule of a corresponding protection potential along with time is tested, a relation curve of the protection potential and a protection distance is drawn to evaluate the protection effect of the sacrificial anode, and a basic test data support is provided for the application of the sacrificial anode in an oil-gas well.

Description

technical field [0001] The invention relates to the technical field of oil and gas field corrosion and protection, in particular to an indoor evaluation device and evaluation method for sacrificial anode materials. Background technique [0002] At present, the oil well pipe strings of oilfield production enterprises generally use ordinary carbon steel pipes, and the oil well production fluid will seriously corrode the carbon steel casing. In order to carry out oilfield development safely and efficiently, various oilfields generally adopt a variety of casing anticorrosion measures other than corrosion-resistant pipes, such as external anticorrosion of impressed current cathodic protection, which is applied earlier and has mature technology, and epoxy cold wrapping tape ( Epoxy coating) sacrificial anode anti-corrosion, commonly implemented corrosion inhibitor filling technology, etc. In recent years, the cathodic protection technology of sacrificial anode inside casing has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/02
CPCC23F13/02C23F2213/32
Inventor 孙雨来慕立俊杨立华程碧海李慧付彩利谷成义张振云卢文伟
Owner PETROCHINA CO LTD