Simulation of gel damage on fracture fluid cleanup and long-term recovery in tight gas reservoirs

Yilin Wang, Stephen A. Holditch, Duane A. McVay

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

20 Citations (Scopus)

Abstract

One major source of new natural gas supplies outside of the United States of American will be gas from low permeability reservoirs. Currently, natural gas from tight sandstones, carbonates, coal seams and shales account for over 25% of the annual gas production in the United States. Global production of gas from similar reservoirs world wide will be expected in the next few decades. For such reservoirs the wells have to be successfully fracture treated to produce at commercial gas flow rates. In many situations, the created length was probably achieved, and maybe even the propped length was achieved. However, due to insufficient proppant concentration, or insufficient proppant transport, or the use of the wrong propping agent, or a fracture fluid that does not break to a low viscosity fluid, the effective fracture length does not provide optimal production results. It is our opinion that insufficient fracture fluid cleanup is the primary cause of poor results when the optimal effective fracture length is not achieved. Fracture fluid cleanup is affected by gel damage, which includes the static yield stress, the flowing yield stress, the amount of polymer residue in the fracture after the fracture closes, and the amount of polymer that forms a filter cake on the walls of the fracture. In addition, there are other issues such as proppant crushing and non-Darcy flow effects that also affect fracture fluid cleanup. In this research, we have used a reservoir simulator to model how polymers in the fracture affect fracture fluid cleanup. We have incorporated mathematical expressions for static yield stress. We have included the effects of proppant crushing, gel residue plugging and the formation of a filter cake on the clean up behavior and the resulting gas flow rates. With our model, we are able to simulate many of the problems we observe in field data and problems documented in the petroleum literature. Even though real solutions to these problems still remain to be developed, we think we can explain the issues behind most fracture fluid cleanup problems and offer a few ideas on what can be done to solve them.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008
Pages202-215
Number of pages14
StatePublished - Dec 1 2008
EventSPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008 - Pittsburgh, PA, United States
Duration: Oct 11 2008Oct 15 2008

Publication series

NameSociety of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008

Other

OtherSPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008
CountryUnited States
CityPittsburgh, PA
Period10/11/0810/15/08

Fingerprint

cleanup
Gels
gel
recovery
gels
damage
Recovery
Fluids
fluid
fluids
gases
simulation
Proppants
Yield stress
crushing
Polymers
polymer
Gases
natural gas
Crushing

All Science Journal Classification (ASJC) codes

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

Cite this

Wang, Y., Holditch, S. A., & McVay, D. A. (2008). Simulation of gel damage on fracture fluid cleanup and long-term recovery in tight gas reservoirs. In Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008 (pp. 202-215). (Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008).
Wang, Yilin ; Holditch, Stephen A. ; McVay, Duane A. / Simulation of gel damage on fracture fluid cleanup and long-term recovery in tight gas reservoirs. Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008. 2008. pp. 202-215 (Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008).
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Wang, Y, Holditch, SA & McVay, DA 2008, Simulation of gel damage on fracture fluid cleanup and long-term recovery in tight gas reservoirs. in Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008. Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008, pp. 202-215, SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008, Pittsburgh, PA, United States, 10/11/08.

Simulation of gel damage on fracture fluid cleanup and long-term recovery in tight gas reservoirs. / Wang, Yilin; Holditch, Stephen A.; McVay, Duane A.

Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008. 2008. p. 202-215 (Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008).

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

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Wang Y, Holditch SA, McVay DA. Simulation of gel damage on fracture fluid cleanup and long-term recovery in tight gas reservoirs. In Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008. 2008. p. 202-215. (Society of Petroleum Engineers - SPE Eastern Regional/AAPG Eastern Section Joint Meeting 2008).