Compressibility of sorptive porous media: Part 1. Background ana theory

Shimin Liu, Satya Harpalani

Research output: Contribution to journalReview article

14 Citations (Scopus)

Abstract

This paper, the first of a two-part series, provides a sound background of the volumetric response of sorptive porous media to gas depletion under in situ boundary conditions m producing reservoirs. As a first step, the overall rock matrix deformation is split into two separate components, elastic deformation caused by mechanical decompression and the nonelastic swelling or shrinkage strain induced by adsorption or desorption of gas. The shrinkage or swelling compressibility is estimated by the first derivative of pure adsorption or desorption strain with variations of gas pressure. The pore volume, or fracture, compressibility is then estimated by application of a semi-empirical model under uniaxial strain conditions. Based on the proposed model, both shrinkage or swelling and pore volume compressibilities show strong pressure dependence for sorbing gases and are thus variables for which gas production is controlled by desoiption of gas. In Part 2, the experimental work under best-replicated in situ conditions is described in detail along with the resujts obtained and application of the theory presented in this paper.

Original languageEnglish (US)
Pages (from-to)1761-1772
Number of pages12
JournalAAPG Bulletin
Volume98
Issue number9
DOIs
StatePublished - Sep 1 2014

Fingerprint

compressibility
Compressibility
Porous materials
porous medium
Gases
swelling
gas
Swelling
desorption
Desorption
adsorption
Adsorption
decompression
gas production
Elastic deformation
boundary condition
Rocks
Acoustic waves
matrix
Boundary conditions

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Geology
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Liu, Shimin ; Harpalani, Satya. / Compressibility of sorptive porous media : Part 1. Background ana theory. In: AAPG Bulletin. 2014 ; Vol. 98, No. 9. pp. 1761-1772.
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Compressibility of sorptive porous media : Part 1. Background ana theory. / Liu, Shimin; Harpalani, Satya.

In: AAPG Bulletin, Vol. 98, No. 9, 01.09.2014, p. 1761-1772.

Research output: Contribution to journalReview article

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AB - This paper, the first of a two-part series, provides a sound background of the volumetric response of sorptive porous media to gas depletion under in situ boundary conditions m producing reservoirs. As a first step, the overall rock matrix deformation is split into two separate components, elastic deformation caused by mechanical decompression and the nonelastic swelling or shrinkage strain induced by adsorption or desorption of gas. The shrinkage or swelling compressibility is estimated by the first derivative of pure adsorption or desorption strain with variations of gas pressure. The pore volume, or fracture, compressibility is then estimated by application of a semi-empirical model under uniaxial strain conditions. Based on the proposed model, both shrinkage or swelling and pore volume compressibilities show strong pressure dependence for sorbing gases and are thus variables for which gas production is controlled by desoiption of gas. In Part 2, the experimental work under best-replicated in situ conditions is described in detail along with the resujts obtained and application of the theory presented in this paper.

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