Prediction Model of Rate Decline for Acid-Fracturing Vertical Wells in Pore-Cavity-Fracture Carbonate Reservoirs

Table 1

Definitions of dimensionless variables.

Dimensionless parameters	Definitions
Pressure in inner zone
Pressure of natural fracture system in outer zone
Production time
Radial distance
Reservoir radius
Wellbore radius
Interzonal diffusivity ratio
Interzonal conductivity ratio
Matrix-fracture crossflow coefficient
Cavity-fracture crossflow coefficient
Cavity-matrix crossflow coefficient
Elastic storability ratio of natural fracture system
Elastic storability ratio of matrix system
Elastic storability ratio of cavity system