Two-phase pressure test analysis
- Rogaland Research Institute (NO)
- Norwegian Inst. of Technology (NO)
A theoretical basis is given for well test analysis of solution-gas and gas-condensate reservoirs in the infinite-acting period. The study is limited to radial flow with a fully penetrating well in the center of the drainage area. Porosity and absolute permeability are constant, and gravitational and capillary effects are neglected. The tests are conducted at constant surface rate, and the skin factor is zero. An analytical expression for the pressure/saturation relationship is derived from the time-dependent gas and oil flow equations. This relationship can be used to generate pseudopressure functions that allow test interpretation with liquid analogy. The infinite-acting drawdown case is treated in detail, while the buildup case is briefly discussed. Theoretical developments are exemplified by simulated drawdown and buildup tests in a solution-gas-drive reservoir.
- OSTI ID:
- 7014772
- Journal Information:
- SPE (Society of Petroleum Engineers) Formation Evaluation; (USA), Journal Name: SPE (Society of Petroleum Engineers) Formation Evaluation; (USA) Vol. 4:4; ISSN 0885-923X; ISSN SFEVE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ANALYTICAL SOLUTION
DRAINAGE
EQUATIONS
FLUID FLOW
FORMATION DAMAGE
GAS CONDENSATE FIELDS
GAS SATURATION
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
OIL SATURATION
PERFORMANCE TESTING
PERMEABILITY
PETROLEUM DEPOSITS
POROSITY
RESERVOIR PRESSURE
RESERVOIR ROCK
RESOURCES
SATURATION
TESTING
TIME DEPENDENCE
TWO-PHASE FLOW