Interpretation of flowing well response in gas-condensate wells
A fully implicit compositional model is used to simulate the well response in a gas-condensate system. The objective of this work is to examine the flowing well response in a condensate reservoir and to examine the effect of liquid condensation on the well response as the pressure drops below the dewpoint. A theoretical foundation for the analysis of well test data in gas-condensate systems is presented. The concept of pseudopressure integrals is introduced and the utility of these integrals--the reservoir and the sandface integrals--to analyze well test data is presented. Short-term performance for both constant-(molar)-rate and constant-pressure production is examined. A pseudopressure transformation is used to incorporate the effects of multiphase flow and changes in fluid composition. The authors show that the pseudopressures may be used to determine formation flow capacity and skin factor. Estimates of skin factor, however, are approximate for production at a constant rate. Long-time performance is examined in detail for the constant-terminal-pressure case. These solutions should be useful in anticipating the problems involved in conducting production forecasts. An inflow equation for both modes of production is presented. The influence of important variables of interest, such as composition, relative permeability characteristics, mode of production, dewpoint pressure, and initial pressure level, is examined. Steady flow in gas-condensate systems is also examined. These solutions are important in their own right and provide important insights into the performance of condensate systems (e.g., cycling). Of importance to this work, the steady-flow solution enables us to verify the accuracy of the numerical solutions and to evaluate the pseudopressure transformation used in this paper.
- Research Organization:
- Univ. of Tulsa, OK (US)
- OSTI ID:
- 6918620
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Vol. 3:3
- Country of Publication:
- United States
- Language:
- English
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GAS CONDENSATE WELLS
PERFORMANCE TESTING
PRESSURE DROP
GEOLOGIC FORMATIONS
FLOW RATE
ACCURACY
DATA ANALYSIS
EQUATIONS
GEOCHEMISTRY
NUMERICAL SOLUTION
PERMEABILITY
CHEMISTRY
TESTING
WELLS
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