Casing collar locator

A casing collar locator, comprising:

• 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;
• 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;
• a first pressure bulkhead disposed in the passage of the first cylindrical member and comprising an annular seal to restrict fluid communication through the passage of the first cylindrical member;
• and
• a second pressure bulkhead disposed in the passage of the second cylindrical member and comprising an annular seal to restrict fluid communication through the passage of the second cylindrical member;
• wherein the first cylindrical member comprises a plurality of circumferentially spaced inserts extending radially from an outer surface of the first cylindrical member;
• wherein the second cylindrical member comprises a plurality of circumferentially spaced inserts extending radially from an outer surface of the second cylindrical member;
• wherein the first pressure bulkhead and the second pressure bulkhead each comprise an electrical connector and a contact spring coupled to the electrical connector that provides a biasing force against the electrical connector, and wherein a contact rod extends centrally through the coil assembly and is electrically connected to the contact springs of the first and second pressure bulkheads.

A casing collar locator, comprising:

• 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;
• a first pressure bulkhead disposed in the passage of the first cylindrical member and comprising an annular seal to restrict fluid communication through the passage of the first cylindrical member;
• a second pressure bulkhead disposed in the passage of the second cylindrical member and comprising an annular seal to restrict fluid communication through the passage of the second cylindrical member;
• 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, and wherein the magnet comprises a north pole and a south pole, the north pole being positioned between a coil of the coil assembly and the south pole;
• wherein the first pressure bulkhead and the second pressure bulkhead each comprise an electrical connector disposed in an insulating housing having an outer surface configured to releasably couple with an inner surface of one of the first and second cylindrical members, and a contact spring coupled to the electrical connector that provides a biasing force against the electrical connector.