Key coupled processes related to gas-fracturing in unconventional reservoirs

D. Elsworth, Q. Gan, C. Marone, P. Connolly, J. Alpern, B. Culp, K. J. Im

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

2 Scopus citations

Abstract

Gaseous stimulants offer some advantages in the "hydraulic" fracturing of low permeability reservoirs over traditional water-based fluids. These include conserving water as a resource, avoiding the activation of clays with added water, in potentially sequestering greenhouse gases and in utilizing competitive sorption for the improved recovery of the hydrocarbon reserve. In addition, the energetics of the gas stimulant may be advantageous in developing networks of increased complexity. Experimental observations are presented of the influence of gas composition and state on the breakdown pressures and evolving fracture complexity of fractures driven by gas - As an analog to hydraulic fracturing in situ for hydrocarbon recovery - for example in gas shales. Gas-fracturing experiments on finite-length boreholes indicate that the breakdown pressure is a strong function of fracturing fluid composition and state - converse to the principle of effective stress. Breakdown stress is shown to correlate with fluid exclusion or invasion into the borehole wall as a function of interfacial characteristics. Interfacial tension, in turn, is modulated by fluid state, as sub- or super-critical, and thus gas type and state influence the breakdown pressure. We explore linkages in the resulting fracture complexity that is indexed by breakdown pressure together with other factors related to the evolution of porosity in tight reservoirs.

Original languageEnglish (US)
Title of host publicationISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
Editors Kaneko, Kodama, Shimizu
PublisherInternational Society for Rock Mechanics
Pages43-50
Number of pages8
ISBN (Electronic)9784907430030
StatePublished - 2014
Event8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, Japan
Duration: Oct 14 2014Oct 16 2014

Publication series

NameISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014

Other

Other8th Asian Rock Mechanics Symposium, ARMS 2014
CountryJapan
CitySapporo
Period10/14/1410/16/14

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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  • Cite this

    Elsworth, D., Gan, Q., Marone, C., Connolly, P., Alpern, J., Culp, B., & Im, K. J. (2014). Key coupled processes related to gas-fracturing in unconventional reservoirs. In Kaneko, Kodama, & Shimizu (Eds.), ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 (pp. 43-50). (ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014). International Society for Rock Mechanics.