US Patent 10502048 Casing collar locator

A casing collar locator including a housing having a first end, a second end, and a passage extending between the first end and the second end, a first cylindrical member having a passage extending therethrough and coupled to the first end of the housing, and a second cylindrical member having a passage extending therethrough and coupled to the second end of the housing, and a coil assembly disposed in the passage of the housing and configured to produce an electrical signal in response to a change in a magnetic field, wherein the coil assembly comprises an annular magnet having a diameter greater than an axial width of the annular magnet.