Oil and water well pipe column underground cathode protecting and corrosion on-line monitoring device and method

A technology for cathodic protection and corrosion monitoring, applied in the field of downhole cathodic protection and corrosion online monitoring of oil-water well strings, can solve the problems of inability to monitor the corrosion of oil-water well strings, large floor space, and low operating efficiency, and achieves guaranteed availability. Continuous development, low power consumption, good effect

Pending Publication Date: 2019-08-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cathodic protection equipment is placed on the ground, which is far away from the downhole pipe string of the oil and water well. It occupies a large area and the equipment is heavy. It needs to build a special power distribution room, which is costly and low in operation efficiency. At the same time, the downhole pipe string of the oil and water well cannot be monitored. Corrosion situation, conventional cathodic protection can no longer meet the needs of the site

Method used

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  • Oil and water well pipe column underground cathode protecting and corrosion on-line monitoring device and method
  • Oil and water well pipe column underground cathode protecting and corrosion on-line monitoring device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] according to Figure 1-2 A downhole cathodic protection and corrosion online monitoring device for an oil-water well string is shown, including

[0060] case;

[0061] Downhole cathodic protection module, the downhole cathodic protection module is connected in the casing, and is used to provide cathodic protection current for oil and water well strings;

[0062] Downhole corrosion on-line detection module, the downhole corrosion on-line detection module is connected in the casing, and is used for on-line monitoring of pipe string corrosion rate;

[0063] The surface cathodic protection monitoring and on-line corrosion monitoring module, the ground cathodic protection monitoring and on-line corrosion monitoring module are electrically connected with the downhole cathodic protection module and the downhole corrosion online detection module.

[0064] In actual use, the downhole cathodic protection module and the downhole corrosion online detection module are connected in...

Embodiment 2

[0067] according to figure 2 A downhole cathodic protection and corrosion on-line monitoring device for oil and water well strings is different from the first embodiment in that the downhole cathodic protection module includes an AC power supply unit, a DC power supply unit, a rechargeable battery unit, Adjustable voltage unit, cathodic protection voltage monitoring unit and cathodic protection current monitoring unit; the AC power supply unit is electrically connected to the DC power supply unit, and the DC power supply unit is electrically connected to the adjustable voltage unit and the rechargeable battery unit, and the rechargeable battery unit The negative electrode is connected to the downhole pipe string of the oil-water well, and the cathodic protection voltage monitoring unit and the cathodic protection current monitoring unit are electrically connected to the ground cathodic protection monitoring and online corrosion monitoring modules.

[0068] In actual use, the ...

Embodiment 3

[0070] according to figure 2 A downhole cathodic protection and corrosion online monitoring device for oil and water well pipe strings shown differs from Embodiment 1 in that the AC power supply unit uses AC220V AC power supply, and the DC power supply unit uses The DC power supply is DC30V, the rechargeable battery unit uses a 24V rechargeable battery, and the adjustable voltage unit uses an adjustable voltage of 0-24V; the DC power supply unit uses an adjustable pulse width Modulated DC power.

[0071] In actual use, the AC power supply unit is fed with 220V AC voltage, which becomes 30V DC through the DC power supply, on the one hand, it supplies power to the rechargeable battery at 24V, and on the other hand, it supplies power to the adjustable DC device and outputs 0-24V to the The anode well is powered, and the voltage and current are monitored by the ground cathodic protection voltage monitoring unit and cathodic protection current monitoring unit, and sent to the gro...

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Abstract

The invention belongs to the technical field of oil and water well pipe column underground cathode protecting and corrosion on-line monitoring, and particularly relates to an oil and water well pipe column underground cathode protecting and corrosion on-line monitoring device and method. According to the oil and water well pipe column underground cathode protecting and corrosion on-line monitoringdevice, by arranging a shell, an underground cathode protecting module connected within the shell and used for providing the cathode protecting current for an oil and water well pipe column, an underground corrosion on-line monitoring module and a ground cathode protecting monitoring and on-line corrosion monitoring module connected within the shell and used for on-line measuring of the corrosionrate of the pipe column, through the four steps of configuring the ground cathode protecting monitoring and on-line corrosion monitoring module, mounting the underground corrosion on-line monitoringmodule and the underground cathode protecting module, conducting debugging of the underground corrosion on-line monitoring module and the cathode protecting module and conducting inspection of the ground cathode protecting monitoring and on-line corrosion monitoring module, and the oil and water well pipe column underground cathode protecting and corrosion on-line monitoring device and method arelow in power consumption, long in protecting distance, high in effect, low in initial input cost, high in reliability, and high in stability and accuracy.

Description

technical field [0001] The invention belongs to the technical field of downhole cathodic protection and corrosion online monitoring of oil and water well pipe strings, and in particular relates to an online monitoring device and method for downhole cathodic protection and corrosion of oil and water well pipe strings. Background technique [0002] Downhole corrosion damage of oil and water well strings will seriously reduce the structural strength, bearing capacity and reliability of the string, shorten the service life of the string, increase operational risks, and threaten the safety of oil and water wells. The downhole corrosion of oil and water well pipe strings is dominated by outer wall corrosion. Cathodic protection is recognized as an effective technology for controlling external corrosion. Reasonable cathodic protection design will effectively prolong the downhole service life of oil and water well pipe strings. Cathodic protection is the most economical, reasonable ...

Claims

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Application Information

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IPC IPC(8): C23F13/22
CPCC23F13/22
Inventor 高宝元贺艺军陈在君李昭辉高诗惠李华伟谭博宁
Owner BC P INC CHINA NAT PETROLEUM CORP
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