Well logging is performed in oil and gas exploration wells to obtain the physical characteristics of underground formations. Thereafter. these wells are cased. Through-casing logging is important in mature fields and for wells that are cased without logging due to borehole stability issues. https://www.roneverhart.com/Bee-International-Candy-Hearts-Tubes-Mike-Ike-Hot-Tamales-and-Warheads-24-Piece-Display/