Relationship of pore structure of fluid behavior in low permeability gas sands: year three. Final report

Technical Report · Fri Feb 01 04:00:00 EST 1985

OSTI ID:6030971

Morrow, N R

This is the final report of a three-year project concerned with the pore structure of low permeability gas sands. The report is divided into five sections: (1) Pressure Sensitivity of Permeability, (2) Effects of Fluid, Confining Pressure, and Temperature on Absolute Permeabilities of Low Permeability Sandstones, (3) Effect of Acid Leaching and Presence of Fractures, (4) Adsorption, and (5) Mathematical Modelling and Correlations. In the first section, a data base of core properties is developed with measurements of permeability vs. confining pressure for three suites of cores as the main feature. The second section reports a study of the dependency of absolute permeabilities of tight gas sands on temperature and confining pressure and the polarity of the fluid used in permeability measurement. The third section describes an initial investigation into (a) the effects of removing carbonate cement by leaching cores with acetic acid, and (b) the effects of calcite-filled fractures on permeability and pressure sensitivity. Results presented in the fourth section on relationships between relative pressure and amount of adsorption provide careful information about the existence and extent of microporous material contained in tight gas sands. The fifth section on mathematical modelling presents results in which the diffusive contribution to flow is calculated for crack-shaped pores in series, and for two- and three-dimensional networks. 16 references, 93 figures, 20 tables.

• Research Organization: New Mexico Inst. of Mining and Technology, Socorro (USA). New Mexico Petroleum Recovery Research Center
• OSTI ID: 6030971
• Report Number(s): NMERDI-2-72-4309; ON: DE85901179
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
ACETIC ACID
CARBOXYLIC ACIDS
CORRELATIONS
CRYSTAL STRUCTURE
DATA
DISSOLUTION
DRILL CORES
EXPERIMENTAL DATA
FAILURES
FRACTURES
INFORMATION
LEACHING
MATHEMATICAL MODELS
MICROSTRUCTURE
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OVERBURDEN
PERMEABILITY
POROSITY
PRESSURE DEPENDENCE
RESEARCH PROGRAMS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEPARATION PROCESSES
TEMPERATURE DEPENDENCE