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Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time

A downhole pipe string, corrosive environment technology, applied in measurement devices, weather resistance/light resistance/corrosion resistance, instruments, etc. The effect of ensuring safety and economy, strong anti-interference ability

Active Publication Date: 2015-03-25
WUHAN CORRTEST INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since the realization principle of the resistance probe is based on Ohm's law, its corrosion resolution is low. This solution is more suitable for long-term corrosion monitoring, but not suitable for rapid corrosion monitoring. reduce

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  • Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time
  • Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time
  • Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] see figure 1 , the downhole corrosion monitoring device constructed in the embodiment of the present invention includes an online downhole corrosion monitoring device, as shown in the attached figure 1 , including waveform generator 1, real-time clock 2, data memory 3, constant potential circuit 4, microcontroller 5, communication interface 6, multi-channel A / D converter 7, bidirectional constant current source 8, power regulator 9, wellhead power supply 10 and composite monitoring probe 11.

[0041] Among them, waveform generator 1, real-time clock 2, data memory 3, constant potential cir...

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Abstract

The invention discloses a compound probe for monitoring corrosion of a down-hole string on line. The compound probe comprises a probe body, an electrical resistance probe, and an alternating current impedance probe, wherein the probe body is sleeved by a cylindrical shell; the electrical resistance probe comprises a sealing reference element and a sensitive element, which are in series connection, and materials of the sealing reference element and the sensitive element are the same as that of the down-hole string; the alternating current impedance probe comprises a reference electrode, a working electrode and an auxiliary electrode and forms an electrochemical three-electrode system. Corrosion allowance of the down-hole string is calculated by collecting terminal voltages of the reference element and the sensitive element of the electrical resistance probe; sine wave signals of different frequency points are loaded on the working electrode, and the polarization current of the auxiliary electrode and the polarization potential of the reference electrode are synchronously collected, so as to obtain the polarization resistance of the working resistance, and then the corrosion velocity can be measured. The invention further discloses a monitoring device with the probe and a monitoring method. According to the compound probe for monitoring the corrosion of the down-hole string on line, the monitoring device and the monitoring method, the quick on-line monitoring of the corrosion velocity of a down-hole oil gas sleeve or string can be realized; and the probe, the monitoring device and the monitoring method are suitable for an environment with any mixed medium of oil, water and gas in a down-hole high-temperature high-pressure environment.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field corrosion monitoring, in particular to a probe, device and method for online real-time monitoring of downhole oil casing corrosion, which is suitable for high-precision online corrosion of any mixed medium of oil, water and gas in a deep well high temperature and high pressure environment Monitoring and evaluation of anti-corrosion measures. Background technique [0002] With the oil and gas field CO 2 Large-scale promotion of tertiary oil recovery technologies such as flooding, led by CO 2 The corrosion problem of deep well tubing and casing caused by oil flooding is becoming more and more serious. Therefore, downhole online corrosion monitoring, as an important task for the safe production of oil and gas fields, has attracted the attention of many oil and gas production enterprises. [0003] At present, conventional downhole oil casing corrosion monitoring adopts the method of corros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/04G01N17/02
Inventor 宋问俗董泽华张德平胡巳旸
Owner WUHAN CORRTEST INSTR
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