Lecture Notes: Analyzing the Impact of Water Influx on Sandstone Reservoirs
I. Introduction
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Importance of analyzing the influence of intensive water production on the stability of
weakly cemented sandstone reservoirs in the Senomanian formations.
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Exploring the mechanism of capillary forces and the reduction of clay cement strength
when interacting with water.
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Drawing parallels with the Urengoy field's operational experience, a regional analog
to the Medvezhe field, regarding water and sand production challenges.
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Highlighting the primary goal of identifying the structure and nature of complications
arising from active water influx and the removal of significant condensate volumes.
II. Diagnostic Methodology for Well Conditions
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Emphasizing the significance of reliable and comprehensive initial data for effective
problem-solving.
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Describing the diagnostic methodology used during well operation and maintenance
in the context of active water production.
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Defining diagnostic criteria for assessing well conditions before and after
maintenance work.
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Establishing threshold values for selected criteria based on theoretical
considerations, industry standards, and operational data.
III. Selected Diagnostic Criteria
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Presenting the chosen diagnostic criteria:
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Liquid saturation ratio.
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Proportion of mechanical impurities.
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Chemical composition of fluids, including trace elements.
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Granulometric or particle size distribution of mechanical impurities.
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Filtration and capacitive properties of the productive formation.
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Quality of cementing in the production casing.
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Technical condition of the well structure.
IV. Conclusion
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Stressing the importance of a systematic diagnostic approach for assessing well
conditions in the presence of water and sand production.
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Recognizing the value of selected diagnostic criteria in providing a comprehensive
understanding of well integrity and performance.