An evaluation of the effects of fracture diagenesis on fracture treatments: Modeled response

D. S. Lee, Derek Elsworth, H. Yasuhara, J. Weaver, R. Rickman

Research output: Contribution to conferencePaper

21 Scopus citations

Abstract

Observed reductions in the permeability of propped hydraulic fractures are examined by considering the role of mechanical stresses and the chemistry of pore fluids at elevated temperatures as agents of proppant diagenesis. Stress-enhanced dissolution of proppant increases the density of grain packing and reprecipitation of mineral matter further occludes pores - together these mechanisms additively reduce porosity and permeability. Experiments and analyses are presented which explore the evolution of porosity and permeability in proppant packs subjected to reservoir conditions. Experiments are completed in two modes: in flow-through reactors absent intergranular stresses to evaluate rates of dissolution and reprecipitation on proppant surfaces; and in uniaxially stressed reactors with stagnant fluids to evaluate the relative role of stress in mediating dissolution and porosity reduction. Lumped parameter models are used to evaluate rates of dissolution and chemical compaction in a range of proppants. Mechanisms include mineral dissolution, transport, and re-precipitation of the resulting products in the particle interstices, resulting in a loss of intergranular porosity. The model uses thermodynamic data recovered from the reactor experiments to constrain the projected loss of permeability for the mineralogical composition of available proppants.

Original languageEnglish (US)
StatePublished - Nov 27 2009
Event43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium - Asheville, NC, United States
Duration: Jun 28 2009Jul 1 2009

Other

Other43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium
CountryUnited States
CityAsheville, NC
Period6/28/097/1/09

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geology
  • Geotechnical Engineering and Engineering Geology

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    Lee, D. S., Elsworth, D., Yasuhara, H., Weaver, J., & Rickman, R. (2009). An evaluation of the effects of fracture diagenesis on fracture treatments: Modeled response. Paper presented at 43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium, Asheville, NC, United States.