Device and method for on-line real-time monitoring of downhole pipe string corrosion

A technology for downhole pipe strings and corrosive environments, which is applied to measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc. It can solve problems such as low corrosion resolution, inapplicability of rapid corrosion monitoring, and reduced accuracy of micro-resistance measurement. Strong anti-interference ability, ensuring safety and economical effect

Active Publication Date: 2017-07-18
WUHAN CORRTEST INSTR
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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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  • Device and method for on-line real-time monitoring of downhole pipe string corrosion
  • Device and method for on-line real-time monitoring of downhole pipe string corrosion
  • Device and method for on-line real-time monitoring of downhole pipe string corrosion

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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 composite probe for on-line monitoring of downhole pipe string corrosion, comprising: a probe body set in a cylindrical casing; a resistance probe, which includes a sealed reference element and a sensing element, connected in series with each other and connected to the downhole pipe string The material is the same; and the AC impedance probe, which includes a reference electrode, a working electrode and an auxiliary electrode, and forms an electrochemical three-electrode system; by collecting the terminal voltage of the reference element and the sensing element of the resistance probe, the downhole pipe string is calculated. Corrosion allowance: By loading sine wave signals of different frequency points on the working electrode, and synchronously collecting the polarization current of the auxiliary electrode and the polarization potential of the reference electrode, the polarization resistance of the working electrode can be obtained, and then the corrosion rate can be measured . The invention also discloses a monitoring device and a monitoring method provided with the probe. The invention can realize rapid on-line monitoring of the corrosion rate of downhole oil and gas casing or pipe column, and is suitable for the environment of any mixed medium of oil, water and gas in the downhole high temperature and 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 Patents(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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