University:
University of South Wales
Course:
F740 | Environmental Science
Academic year:

2023
Views:

29

Pages:

1
Author:

Maria C.

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

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