Typecurve Models

Typecurve analyses use different models, which you select when you create an analysis worksheet.

Typecurve models are as follows:

• Radial — cylindrical reservoir with a vertical well in the center.
• Fracture — cylindrical or rectangular reservoir with an infinite conductivity fracture in the center.
• Water Drive — cylindrical reservoir with a concentrically cylindrical aquifer. This model is based on a radial composite model, with the outer region representing the aquifer, characterized by several different levels of aquifer mobility, relative to the reservoir. The mobility ratios range from zero (no aquifer) to 10 (effectively constant pressure boundaries). The aquifer model assumes a water zone of infinite extent.

Note:   Water drive is not available using the IHS CBM license.

• Horizontal — square reservoir with a horizontal well in the center. There are actually nine different horizontal well models. Each model represents a different penetration ratio "Le /2xe"(ratio of effective wellbore length to reservoir length) and dimensionless wellbore radius "rwD" (ratio of effective wellbore radius to effective wellbore length).
• Elliptical — elliptical reservoir with a finite conductivity fracture in the center.
• Finite Conductivity Fracture — cylindrical (Blasingame) or square (Transient) reservoir with a finite conductivity fracture in the center.