Hydrologic characterization of coal seams for methane recovery--Activities 5 and 7 progress report: review of single-phase hydrologic testing in coalbeds and development of unsaturated-flow well-test procedures. Topical report, June 1983-December 1984

Technical Report · Wed May 01 00:00:00 EDT 1985

OSTI ID:6316517

Way, S C; Bumb, A C; Koenig, R A; McKee, C R; Reverand, J M

Activities 5 and 7 are part of a program to hydrologically characterize coal seams for designing effective dewatering schemes. Activity 5 evaluated the single-phase well testing methods that are used in analyzing coal seams and assessed the effectiveness of dewatering designs. Activity 7 examined stress-dependent permeability effects and discovered an intermediate, unsaturated flow regime (between single-phase flow of water and two-phase flow of gas and water), and developed appropriate testing and data analysis procedures. Examination of five cases in which single-phase test methods were used in coal seams proved that instantaneous and constant-rate methods are useful when appropriate precautions are observed. A model of a stress-sensitive aquifer was developed and used to show that stress sensitivity is apparently insignificant in the case available for application. The method was applied to a drawdown test in which unsaturated flow was observed.

• Research Organization: In-Situ, Inc., Laramie, WY (USA)
• OSTI ID: 6316517
• Report Number(s): PB-86-102886/XAB
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
01 COAL, LIGNITE, AND PEAT
COAL SEAMS
HYDROLOGY
METHANE
RECOVERY
AQUIFERS
DESIGN
GAS FLOW
GROUND WATER
MATHEMATICAL MODELS
PERMEABILITY
POROSITY
STRESSES
WATER REMOVAL
ALKANES
COAL DEPOSITS
FLUID FLOW
GEOLOGIC DEPOSITS
HYDROCARBONS
HYDROGEN COMPOUNDS
MINERAL RESOURCES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
REMOVAL
RESOURCES
WATER
030900* - Natural Gas- Artificial Stimulation
Plowshare- (-1989)
010000 - Coal
Lignite
& Peat