EOR potential for lean gas reinjection in zipper fracs in liquid-rich basins

Oluwanifemi Akinluyi, Randy Hazlett

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

1 Citation (Scopus)


Production from liquid-rich shale has become an important contributor to domestic production in the United States, but recovery factors are low. Enhanced Oil Recovery (EOR) methods require injectivity and interwell communication on reasonable time scales. We conduct a feasibility study for the application of recycled lean gas injection to displace reservoir fluids between zipper fracs in liquid-rich shales. Using new analytical solutions to the Diffusivity equation for arbitrarily-oriented line sources/sinks plus superposition, we analyze the time for inter-fracture communication development, i.e. interference, and productivity index for both classical bi-wing fractures in a zipper configuration and complex fracture networks. We are able to map both pressure and pressure temporal derivative as a function of time and space for production and/or injection from parallel motherbores under the infinite conductivity wellbore and fracture assumption. The infinite conductivity assumption could be later relaxed for more general cases. We couch the results in terms of geometrical spacing requirement for both horizontal wells and stimulation treatments to achieve reasonable time frames for inter-fracture communication and sweep for parameters typical of various shale plays. We further analyze whether spacing currently considered for primary production is sufficient for direct implementation of EOR or if current practice should be modified with EOR in the field development plan.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Improved Oil Recovery Conference
PublisherSociety of Petroleum Engineers (SPE)
ISBN (Electronic)9781613994399
Publication statusPublished - 2016
Externally publishedYes
EventSPE Improved Oil Recovery Conference 2016 - Tulsa, United States
Duration: Apr 11 2016Apr 13 2016

Publication series

NameSPE - DOE Improved Oil Recovery Symposium Proceedings


ConferenceSPE Improved Oil Recovery Conference 2016
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • General Chemical Engineering


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