Cased-Well to Cased-Well Active Magnetic Ranging

An electromagnetic ranging system for ranging between two cased wellbores, comprising:

• a first downhole tool, wherein the first downhole tool comprises a transmitter;
• a first conveyance line, wherein the first downhole tool is disposed on the first conveyance line, wherein the first conveyance line is disposed in a first cased wellbore;
• a second downhole tool, wherein the second downhole tool comprises a receiver;
• a second conveyance line, wherein the second downhole tool is disposed on the second conveyance line, wherein the second conveyance line in a second cased wellbore;
• and
• an information handling system configured for exciting the transmitter to broadcast an electromagnetic field, wherein the information handling system is further configured for recording the electromagnetic field with the receiver and determining relative position between the first cased wellbore and the second cased wellbore.

A method for ranging between two cased wellbores, comprising:

• disposing a first downhole tool on a first conveyance line in a first cased wellbore, wherein the first downhole tool comprises a transmitter;
• disposing a second downhole tool on a second conveyance line in a second cased wellbore, wherein the second downhole tool comprises a receiver;
• exciting the transmitter;
• broadcasting an electromagnetic field from the transmitter;
• recording the electromagnetic field with the receiver;
• transmitting the recording to an information handling system;
• calculating the location and/or orientation of the first cased wellbore with respect to the second cased wellbore with the information handling system;
• and
• drilling out the second cased wellbore.