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Zheng Y.-J.,China National Offshore Oil Corporation | Zeng T.,China National Offshore Oil Corporation | Liu Z.-L.,China National Petroleum Corporation | Gu X.-M.,No. 1 Oil Production Factory
Well Testing | Year: 2016

The down-hole monitoring system of electric submersible pump(ESP)is the key unit for monitoring in real-time the down-hole work environment bottom hole pressure, ambient temperature, and liquid level, etc.) and the ESP running status(motor temperature, pump s vibration and cable current leakage), ensuring safe operation, and more efficient and long-term stable production. Based upon the monitoring system s operating principle and field application character, a common set of malfunctions and running failure of the system are summarized and analyzed, the corresponding troubleshooting methods are presented. First, according to the field application requirements, an online system fault diagnosis method is given. Then, base on the internal structure and function of the monitor system, three model based diagnosing methods for failure identification and location is proposed, which are hierarchy diagnosing method, comparison analysis, and component based analysis. Field application shows that the proposed method has a high accuracy of location and fault diagnosis, whose effect is remarkable. © 2016, The Editorial Department of Well Testing. All right reserved.

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