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            Release 
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            1. 
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            1.  
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            1. The 3W Dataset's main configuration file ([dataset.ini](dataset.ini)) was updated.
         
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            ---
         
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            configs:
         
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            - config_name: default
         
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              data_files:
         
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              - split: simulated
         
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                path:
         
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                  - "0/SIMULATED_*.parquet"
         
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                  - "1/SIMULATED_*.parquet"
         
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                  - "2/SIMULATED_*.parquet"
         
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                  - "3/SIMULATED_*.parquet"
         
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                  - "4/SIMULATED_*.parquet"
         
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                  - "5/SIMULATED_*.parquet"
         
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                  - "6/SIMULATED_*.parquet"
         
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                  - "7/SIMULATED_*.parquet"
         
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                  - "8/SIMULATED_*.parquet"
         
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                  - "9/SIMULATED_*.parquet"
         
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              - split: drawn
         
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                path:
         
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                  - "0/DRAWN_*.parquet"
         
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                  - "1/DRAWN_*.parquet"
         
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                  - "2/DRAWN_*.parquet"
         
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                  - "3/DRAWN_*.parquet"
         
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                  - "4/DRAWN_*.parquet"
         
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                  - "5/DRAWN_*.parquet"
         
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                  - "6/DRAWN_*.parquet"
         
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                  - "7/DRAWN_*.parquet"
         
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                  - "8/DRAWN_*.parquet"
         
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                  - "9/DRAWN_*.parquet"
         
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              - split: well
         
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                path:
         
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                  - "0/WELL-*.parquet"
         
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                  - "1/WELL-*.parquet"
         
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                  - "2/WELL-*.parquet"
         
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                  - "3/WELL-*.parquet"
         
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                  - "4/WELL-*.parquet"
         
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                  - "5/WELL-*.parquet"
         
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                  - "6/WELL-*.parquet"
         
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                  - "7/WELL-*.parquet"
         
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                  - "8/WELL-*.parquet"
         
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                  - "9/WELL-*.parquet"
         
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            ---
         
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            [![CC BY 4.0][cc-by-shield]][cc-by]
         
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            [![Versioning][semver-shield]][semver]
         
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            [cc-by]: http://creativecommons.org/licenses/by/4.0/
         
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            [cc-by-shield]: https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg
         
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            [semver]: https://semver.org
         
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            [semver-shield]: https://img.shields.io/badge/semver-2.0.0-blue
         
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            # Table of Content
         
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            * [Introduction](#introduction)
         
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            * [Release Notes](#release-notes)
         
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              * [1.0.0](#100)
         
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              * [1.1.0](#110)
         
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              * [1.1.1](#111)
         
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              * [2.0.0](#200)
         
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            # Introduction
         
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            All 3W Dataset data files (files in the subdirectories of the [dataset](dataset) directory) are licensed under the [Creative Commons Attribution 4.0 International License][cc-by].
         
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            # Release Notes
         
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            Each subsection below contains release notes for a specific 3W Dataset version. Differences from the immediately previous version are highlighted.
         
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            ## 1.0.0
         
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            Release: July 1, 2019.
         
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            This was the first published version, which is fully described in [this](https://doi.org/10.1016/j.petrol.2019.106223) paper.
         
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            ## 1.1.0
         
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            Release: December 30, 2022.
         
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            Highlights:
         
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            1. New instances were added as follows:
         
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                * 1 instance of event type 7.
         
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            1. Instances were removed due to issues identified as follows:
         
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            	* 3 instances of event type 0;
         
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            	* 1 instance of event type 5;
         
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            	* 3 instances of event type 8, when compared to what is described in the paper **A realistic and public dataset with rare undesirable real events in oil wells** published in the **Journal of Petroleum Science and Engineering** (link [here](https://doi.org/10.1016/j.petrol.2019.106223)).
         
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            1. Normal periods of certain instances with anomalies were increased as possible. We tried to have instances with minimum normal periods of 1 hour;
         
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            1. Names of certain files with instances have changed due to increased normal periods;
         
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            1. Labels in some real instances were adjusted by experts;
         
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            1. All values of some variables in some real instances were corrected due to corrections in historian systems' tag configurations;
         
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            1. Certain variable values have undergone minimal change due to different rounding;
         
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            1. The 3W Dataset's main configuration file ([dataset.ini](dataset.ini)) was updated.
         
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            ## 1.1.1
         
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            Release: April 09, 2023.
         
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            Highlights:
         
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            1. Issue #60 was resolved;
         
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            1. Issue #65 was resolved;
         
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            1. Certain variable values have undergone minimal change due to different rounding;
         
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            1. The 3W Dataset's main configuration file ([dataset.ini](dataset.ini)) was updated.
         
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            ## 2.0.0
         
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            Release: July 25, 2024.
         
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            Highlights:
         
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            1. All instances are now saved in Parquet files (created with the `pyarrow` engine and `brotli` compression);
         
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            1. Reduction in disk space occupied by the 3W Dataset of 3.15 GB (from 4.89 GB to 1.74 GB);
         
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            1. Real and simulated instances of type 9 were added;
         
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            1. Several instances of types 0, 3, 4, 5, 6 and 8 were added;
         
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            1. Another 24 real wells were covered with new real instances (now 42 real wells are covered);
         
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            1. Some real instances, mainly of type 1, were removed;
         
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            1. 1 variable was removed (`T-JUS-CKGL`);
         
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            1. Another 20 variables were added (there are now 27 variables);
         
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            1. Another label referring to well operational status was added;
         
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            1. Normal periods in several real instances with unwanted events were extended;
         
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            1. All labeling gaps in real instances were eliminated (all observations were labeled);
         
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            1. Conversions between measurement units in several instances were corrected;
         
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            1. Labels in several real instances were adjusted by experts;
         
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            1. All values of some variables in some real instances were corrected due to corrections in historian systems' tag configurations;
         
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            1. Certain variable values have undergone minimal change due to different rounding;
         
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            1. The 3W Dataset's main configuration file ([dataset.ini](dataset.ini)) was updated.
         
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