Determination of source and breakthrough mechanism of water production in a naturally fractured basement reservoir by analysing water production data
Abstract
Excessive production of water in the naturally fractured basement reservoir has been one of the most intriguing problems in production engineering. Water may appear immediately at early production stage or break through after months on stream. Available methods to determine the source of produced water are entirely based on chloride content. Stiff diagram is one of the well-known graphical methods in place to confirm whether it is formation water by various chemical components. With the Stiff diagram, the operators are able to detect formation water at the early days which apparently assists in quantifying the potential of scale deposit, erosion and so on.
Apart from the water sources, it is crucial to understand the water-out mechanism also via graphical approach. The characteristic trend of water-oil-ratio and its derivative with time in log-log plot indicate a variety of slopes refl ecting different flowing mechanisms and a vast majority of them are attributed to the coning and channelling dependent on the level of pressure depletion and rock fluid interaction. A thorough understanding of the water source and its break-through mechanism is indispensable to production monitoring and optimising well production performance in the long run.
References
2. Erika Elswick. Methods for analytical geochemistry. Geology 214 (Lectures), Indiana University. 2012.
3. Alexander Zaporozec. Graphical interpretation of water - Quality data. Department of Geology
and Geophysics, University of Wisconsin. 1972; 10(2): p. 32 - 43.
4. Abbas Ali Changalvaie1, Kazem Lovimi, Abbas Khaksar. Mechanism of excessive water production in an Iranian offshore oilfield. Petroleum Engineering Department, Islamic Azad University. 2012.
5. Water sample analysis & evaluation report. Laboratory of Research & Development Center for
Petroleum Processing. December 2014.
1. The Author assigns all copyright in and to the article (the Work) to the Petrovietnam Journal, including the right to publish, republish, transmit, sell and distribute the Work in whole or in part in electronic and print editions of the Journal, in all media of expression now known or later developed.
2. By this assignment of copyright to the Petrovietnam Journal, reproduction, posting, transmission, distribution or other use of the Work in whole or in part in any medium by the Author requires a full citation to the Journal, suitable in form and content as follows: title of article, authors’ names, journal title, volume, issue, year, copyright owner as specified in the Journal, DOI number. Links to the final article published on the website of the Journal are encouraged.
