Equation 11 is rearranged into the reservoir impedance of an approximate source-sink pair in Equation , where the well radius is half the well diameter. Note that the flow rate, 𝑚̇, is equal to 𝑚̇𝑡 𝑜𝑡 in this section because we analyzed the entire circumference of the well, unlike in Sec. 2.1.1 where we only analyzed one-quarter of the circumference.