Fig. 1
. Dual-layer well schematic
p_e = \frac{J_1 \cdot p_1 + J_2 \cdot p_2}{J_1 + J_2}
p_e = \frac{J_1 \cdot p_1 + J_2 \cdot p_2}{J_1 + J_2}
See also
Formation pressure (Pe)