A Novel Resistance Measurement Method Based on Double Frequency Excitation Signals Eliminating the Infection of Distributed Capacitance

Zhong, Chongquan; Zhao, Liang

doi:10.14257/ijca.2017.10.6.17

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…To accurately measure the actual well fluid resistance and solve the influence of capacitance effect and polarization effect on the measurement results, we have studied several mature conductivity measurement methods at present: operational amplifier conductivity measurement method [26], bipolar pulse excitation method [27], phase-sensitive detection method [28] and dual-frequency sinusoidal signal measurement method [29], These methods have their advantages in reducing measurement errors.…”

Section: B Conductivity Measurement Methodsmentioning

confidence: 99%

Instrument Design for Detecting the Inner Damage of Casing

Guo

Yong

Li³

et al. 2021

IEEE Access

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Detecting and localizing the inner damage of the downhole casing is crucial for oil and gas production. The current methods for damage detection suffer from polarization effect, capacitance effect, and difficulty in measuring weak direct current signals. As an alternative, we propose a new instrument design based on a six-electrode array in this study. The basic detection principle is introduced, and the key factors that affect the detection performance are studied through modeling and simulation. Besides, the entire system of the instrument design consisting of several modules is presented. In addition, an experiment is conducted to demonstrate the detection capability of the proposed design. It is found that the detection dynamic of the instrument is 93 dB and a signal-to-noise ratio is 73 dB. It can detect damage when salinity is lower than 120 g/l and can identify the location of damage with high resolution in the longitudinal and radial directions.

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Section: B Conductivity Measurement Methodsmentioning

confidence: 99%