Well test analysis for naturally-fractured reservoirs
Conference
·
OSTI ID:5324045
In this work pressure transient analysis for constant rate production and transient rate analysis for constant pressure production are presented for a naturally fractured reservoir. Constant producing pressure solutions, which define declining production rates with time, are presented. The solutions for the dimensionless flowrate and pressure are based on a model presented by Warren and Root (1963). The results obtained for a finite no-flow outer boundary are new and surprising. It was found that the flowrate shows a rapid decline initially, becomes nearly constant for a period, and then a final decline in rate takes place. A striking result of the present study is that ignoring the presence of a constant flowrate period in a type-curve match can lead to erroneous estimates of the dimensionless outer radius of a reservoir. A method to determine the permeability-thickness product for a naturally-fractured reservoir is presented. The method involves a semilog graph of the pressure difference log(anti p-p/sub ws/) vs shut-in time ..delta..t. The mathematical theory is based on the extended Muskat analysis for a homogeneous reservoir. A comparison is made with the Pollard method. It was found that both methods are mathematically related. The dimensionless matrix pressure and fracture pressure distributions are presented for both the constant rate case and constant pressure production. Interference tests for the constant rate production can be interpreted at long times using the line-source solution. For the constant pressure production case, the pressure array from the wellbore does not correlate with the line source solution.
- OSTI ID:
- 5324045
- Report Number(s):
- SGP-TR-60; CONF-821214-16
- Country of Publication:
- United States
- Language:
- English
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