Appendix F: Glossary

BUILDUP TEST: This is a test where the well is shut-in and the pressure is allowed to build up. Drawdown and Buildup tests are conducted to evaluate reservoir and well properties.
CRITICAL RATE, q _c: Critical rate is the maximum rate at which oil is produced without production of water or gas (whenever top gas or bottom water zones are present, along with an oil zone).
DECLINE CURVE: Decline curve is a plot of production history against time. There are three types of decline curves: Linear, Log-Log, and Semi-Log. Extrapolation of these curves is used to calculate reserves. In general, the reserves calculated by using a semi-log plot are different than those calculated using a log-log plot.
DIMENSIONLESS PRESSURE, p _D: This is used to calculate the change of pressure over time. Normally, the dimensionless pressure is based upon initial reservoir pressure minus the present well flowing pressure. Therefore, for a fixed flow rate, as time progresses, the well flowing pressure decreases and dimensionless pressure increases.
DIMENSIONLESS TIME, t _D: Dimensionless time is used to describe the variation in different mathematical solutions over time. There are two types of dimensionless time. One is based on either the wellbore radius for a vertical well, the fracture half-length for a fractured vertical well, or half the well length for a horizontal well. The other type of dimensionless time is based upon the drainage area A, and this dimensionless time is the same regardless of the well...

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