Minifrac Soliman / Craig ACA Radial Time

There is one Minifrac Soliman / Craig After-Closure Analysis (ACA) radial time function, which is defined in Reference 7 as:

Note:

It has a minimum value of 0.0 (at late time) representing an infinite shut-in time. P* is the extrapolation of the radial line to FR = 0, which corresponds to an infinite shut-in time.