Reservoir engineering study of low-permeability Western gas sands. Final report
The parameters of formation permeability, porosity, gas saturation net pay thickness, and well spacing were investigated to develop a multiple-well transient test. Long test times were found to be required for interference or pulse testing in low permeability gas reservoirs; however, well spacing has been optimized. The new type curves developed account for the length of time a well was on production prior to shut-in for the buildup test. Estimates of permeability, fracture half-length, and fracture conductivity are given by analysis of the pressure buildup using the curves. It was found that the results from Horner analysis of a vertically fractured well's pressure analysis are affected by the length of time a well produces prior to starting the buildup test. Long dimensionless flow times are needed for the Horner straight line to develop, thus requiring long flowtimes for Horner analysis of fractured wells in low permeability reservoirs. Several examples using the new curves are presented. The uniqueness study indicated that when certain parameters are accurately known through rock analysis and pressure studies, the simulations are unique. If a few key parameters are unknown and must be determined through history-matching with the simulator, uncertainty arises as to whether the solution is unique. Additional studies concerning fracture skin and wellbore storage, fracture geometry, and fracture fluid remaining in and around the fracture were performed to determine their effects on the pressure transient response and production forecast of a well. 68 figures, 10 tables.
- Research Organization:
- Intercomp Resource Development and Engineering, Inc., Denver, CO (USA)
- DOE Contract Number:
- AC19-79BC10106
- OSTI ID:
- 6747341
- Report Number(s):
- DOE/BC/10106-29; ON: DE83001742
- Country of Publication:
- United States
- Language:
- English
Similar Records
Well test analysis for wells produced at a constant pressure
Short-term transient-rate and pressure-buildup analysis of low-permeability reservoirs
Related Subjects
030900* -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
COMMINUTION
ENGINEERING
FRACTURING
FUNCTIONS
GAS SATURATION
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS WELLS
PARAMETRIC ANALYSIS
PERMEABILITY
POROSITY
PRESSURIZING
RESERVOIR ENGINEERING
RESOURCES
RESPONSE FUNCTIONS
ROCKS
SANDSTONES
SATURATION
SEDIMENTARY ROCKS
STIMULATION
TESTING
TRANSIENTS
WELL SPACING
WELL STIMULATION
WELLS