A new approach for constructing derivative type curves for well test analysis
Recently, type curves based on pressure derivatives have become a highly popular method for analyzing well test data. Typically, these type curves represent a log-log plot of dimensionless pressure and the derivative of dimensionless pressure vs. dimensionless time. This work presents a new general procedure for constructing type curves based on a new combination of dimensionless pressure and the derivative of dimensionless pressure. The procedure can be used to construct type curves for all standard problems encountered in well testing. The new type curves always have good character so that nonuniqueness problems sometimes encountered in type-curve matching are eliminated;p thus, the type curves constructed by our method should improve our ability to obtain accurate estimates of reservoir parameters by type-curve matching. The basic procedure is used to construct new type curves for wellbore storage and skin problems and for fractured wells (uniform-flux and infinite-conductivity). These type curves are constructed so that the vertical scale of the dimensionless derivative groups is automatically aligned with the vertical scale of the field-data derivative groups; thus, type-curve matching of field derivative data is accomplished by moving the field data plot only in the horizontal direction. This automatic alignment of the vertical scales simplifies type-curve matching and also is advantageous for determining whether field data actually represent the solution assumed by a given type curve.
- Research Organization:
- Univ. of Tulsa (US)
- OSTI ID:
- 7104937
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Vol. 3:1
- Country of Publication:
- United States
- Language:
- English
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