Horizontal Multifrac – Repeating Pattern Model

This model is a homogeneous, single-phase, rectangular reservoir model consisting of a horizontal wellbore and transverse fractures. The wellbore is located in the center of the reservoir. Fractures are considered to be symmetrically distributed within each stage, and all stages are identical.

Because all fractures follow a repeating pattern, after you specify fracture locations, fracture half-lengths, and fracture conductivities for one stage, the parameters of the rest of the stages are populated automatically.

Prior to calculating the whole system’s solution, the model generates the solution for one single stage through superposition of individual infinite conductivity fracture solutions in space. Then the whole system’s solution is calculated by multiplying the single stage’s solution by the number of stages. Consequently, the speed of calculation is improved and depends on the number of fractures in each stage, rather than the total number of fractures.

This model is similar to the general horizontal multifrac model, and it can model the combined effects of the horizontal wellbore and multiple transverse fractures, as well as the transition period between flow regimes. Skin is applied along the length of the horizontal wellbore, and a turbulence factor may be specified.