Assessing the validity and limitations of dualporosity models using geological well testing for fractured formations

D. Egya, S. Geiger, P. Corbett, K. Bisdom, G. Bertotti, H. Bezerra

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Geological well testing is a valuable tool that allows us to improve understanding of pressure transient behaviour in a fractured reservoir. However, not all wells in a fractured reservoir will show pressure transients that are expected for NFRs. Our findings demonstrate that high resolution models with proper grid refinement around the wells and fractures are required to model pressure transient behaviour adequately and produce a physically meaningful wellbore response for a fractured reservoir. The key concept for interpreting well test data from fractured reservoirs is the dual-porosity model. This model, originally developed by Warren and Root (1963) has been the industry standard for modelling NFRs and interpreting well-test data from NFRs for more than 50 years. Although there are a number of factors impacting the exact shape of the pressure transients, our results suggest that observing the classical "Vshape" in the pressure derivative, as expected from a dual-porosity model may be an exception, rather than a rule in NFR, even for well-connected fracture networks. Our work quantifies when and why the assumptions inherent to the dual-porosity model break down when interpreting well-test data from NFR.

Original languageEnglish
Title of host publication78th EAGE Conference and Exhibition 2016
PublisherEAGE Publishing BV
Number of pages5
ISBN (Electronic)9789462821859
DOIs
Publication statusPublished - 2 Jun 2016
Event78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential - Vienna, Austria
Duration: 30 May 20162 Jun 2016

Conference

Conference78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
CountryAustria
CityVienna
Period30/05/162/06/16

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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    Egya, D., Geiger, S., Corbett, P., Bisdom, K., Bertotti, G., & Bezerra, H. (2016). Assessing the validity and limitations of dualporosity models using geological well testing for fractured formations. In 78th EAGE Conference and Exhibition 2016 EAGE Publishing BV. https://doi.org/10.3997/2214-4609.201601449