New Analytical Method to Evaluate Casing Integrity during Hydraulic Fracturing of Shale Gas Wells

Figure 4

CCF composite assembly. Formation boundary temperature, T_f; internal casing temperature, T_n; internal casing pressure, P_i; radius, R_i, i = 1, 2, 3, 4 present the radii of the internal casing wall, outer casing wall, internal wellbore, and formation boundary, respectively; the counterclockwise angle from the x-direction to the calculated point, θ.