By combining Equations 3 and 4 and integrating from the interface between the well and the porous media, 𝑥 0 , to the midpoint between the two wells, 𝐿/2, we arrive at Equation 5 where 𝐿 is the distance between the injection and production wells (i.e., the well spacing). Integration of Equation 5 yields Equation , where ∆𝑃 is the pressure decrease from the well to the midpoint.