How to improve our understanding of gas and oil production mechanisms in liquid-rich shale

Masoud Alfi, Bicheng Yan, Yang Cao, Cheng An, Yuhe Wang, John Killough

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

24 Citations (Scopus)

Abstract

Three phase oil, gas, and water flow in liquid-rich shale plays is investigated in this paper, using a state-of-the-art technique of dividing shale matrix into different sub-media. Shale reservoirs always present numerous challenges to modeling and understanding, from unintuitive, heterogeneous, and difficult to characterize rock properties, to limited understanding of the governing flow equations, lack of fundamental knowledge on related desorption mechanisms, and nearly impermeable formations with pores on the order of magnitude as the mean free path of gas molecules. This work proposes a partitioning scheme to divide porous media in shale into three different sub-media (porosity systems) with distinctive characteristics: inorganic matter and kerogen (in the shale matrix), along with fracture network (natural or hydraulic). The current model gives us the capability of better analyzing the complex nature of mass transfer in shale. Relative permeabilities in our model are accounted for by employing the functions specifically presented for shale reservoirs. Our model can also handle various flow and storage mechanisms corresponding with shales such as molecule/wall interactions and slippage of the gas phase, multicomponent desorption, and capillarities. Simulation results show that hydrocarbon production from shale reservoirs exhibits complicated dynamics that are controlled by a number of different factors. Because of very high capillary pressure in shale, water is observed to imbibe into the water-wet inorganic matter during the late production period. On the contrary, mass flow in the oil-wet kerogen is mostly limited to two-phase oil and gas flow. Although kerogen is considered to be a rich source of hydrocarbon, relatively high capillary pressure and very low rock permeability hinder oil production in organic-rich shale. We might be able to address such problems by employing an appropriate production enhancement technique compatible with the ultra-tight nature of such reservoirs.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2014
PublisherSociety of Petroleum Engineers (SPE)
Pages5017-5042
Number of pages26
Volume7
ISBN (Electronic)9781634398879
Publication statusPublished - 2014
Externally publishedYes
EventSPE Annual Technical Conference and Exhibition, ATCE 2014 - Amsterdam, Netherlands
Duration: 27 Oct 201429 Oct 2014

Other

OtherSPE Annual Technical Conference and Exhibition, ATCE 2014
CountryNetherlands
CityAmsterdam
Period27/10/1429/10/14

Fingerprint

Shale
Liquids
Gases
Kerogen
Capillarity
Desorption
Hydrocarbons
Rocks
Oils
Water
Molecules
Gas oils
Flow of gases
Porous materials
Mass transfer
Porosity
Hydraulics

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Alfi, M., Yan, B., Cao, Y., An, C., Wang, Y., & Killough, J. (2014). How to improve our understanding of gas and oil production mechanisms in liquid-rich shale. In Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2014 (Vol. 7, pp. 5017-5042). Society of Petroleum Engineers (SPE).

How to improve our understanding of gas and oil production mechanisms in liquid-rich shale. / Alfi, Masoud; Yan, Bicheng; Cao, Yang; An, Cheng; Wang, Yuhe; Killough, John.

Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2014. Vol. 7 Society of Petroleum Engineers (SPE), 2014. p. 5017-5042.

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

Alfi, M, Yan, B, Cao, Y, An, C, Wang, Y & Killough, J 2014, How to improve our understanding of gas and oil production mechanisms in liquid-rich shale. in Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2014. vol. 7, Society of Petroleum Engineers (SPE), pp. 5017-5042, SPE Annual Technical Conference and Exhibition, ATCE 2014, Amsterdam, Netherlands, 27/10/14.
Alfi M, Yan B, Cao Y, An C, Wang Y, Killough J. How to improve our understanding of gas and oil production mechanisms in liquid-rich shale. In Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2014. Vol. 7. Society of Petroleum Engineers (SPE). 2014. p. 5017-5042
Alfi, Masoud ; Yan, Bicheng ; Cao, Yang ; An, Cheng ; Wang, Yuhe ; Killough, John. / How to improve our understanding of gas and oil production mechanisms in liquid-rich shale. Society of Petroleum Engineers - SPE Annual Technical Conference and Exhibition, ATCE 2014. Vol. 7 Society of Petroleum Engineers (SPE), 2014. pp. 5017-5042
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