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- W2034952803 abstract "Abstract Intermittent gas lift is widely used in the PETROBRAS onshore petroleum fields. The intermittent gas injection in the annulus between the tubing and casing causes a gas lift valve to open. This gas lift valve is a pressure driven valve installed in the lower part of the tubing and controls the amount of gas injected at the bottom of a liquid column held inside the tubing. The injected gas becomes a big gas bubble that carries the liquid column up to the surface. The intermittent cycles are obtained by a motor-valve installed at the surface opening and closing at fixed time intervals (Time cycle – Tc) and remaining open during a fixed amount of time (Time injection – Ti). This work presents the concepts use in a firmware for Programmable logic Control (PLC) especially designed to optimize both Tc and Ti. Based on the tubing and casing pressure continuously acquired by a pair of electronic pressure transmitters (PT) and on artificial intelligence (AI) concepts such as neural nets and fuzzy logic, this firmware performs the pattern recognition of the casing and tubing pressure behavior, executes an algorithm implemented by the user and gives a diagnostic about the performance of the system. With the diagnostic and changing the values of Ti and Tc, the electronic device improves the system performance, reducing the gas consumption and increasing the liquid production. The electronic device is installed at the well site and send to the central office, by request, the data acquired from the well. At the central office, a PC computer with a modem performs a data pooling, well by well, and stores the acquired data in MS-Access type data base for further statistical and historical analysis." @default.
- W2034952803 created "2016-06-24" @default.
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- W2034952803 date "2001-03-25" @default.
- W2034952803 modified "2023-10-16" @default.
- W2034952803 title "Intelligent Automation for Intermittent-Gas-Lift Oil Wells" @default.
- W2034952803 cites W1971947151 @default.
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- W2034952803 doi "https://doi.org/10.2118/69404-ms" @default.
- W2034952803 hasPublicationYear "2001" @default.
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