US 11,781,421 B2
Method and apparatus for magnetic ranging while drilling
Clinton Moss, Spring, TX (US)
Assigned to Gunnar LLLP, Spring, TX (US)
Filed by Gunnar LLLP, Spring, TX (US)
Filed on Sep. 22, 2021, as Appl. No. 17/482,045.
Claims priority of provisional application 63/216,861, filed on Jun. 30, 2021.
Claims priority of provisional application 63/081,692, filed on Sep. 22, 2020.
Prior Publication US 2022/0090484 A1, Mar. 24, 2022
Int. Cl. E21B 17/00 (2006.01); E21B 44/00 (2006.01); E21B 47/00 (2012.01); E21B 7/04 (2006.01); G01D 5/14 (2006.01); E21B 47/0228 (2012.01)
CPC E21B 47/0228 (2020.05) [E21B 7/04 (2013.01); E21B 17/00 (2013.01); E21B 44/00 (2013.01); E21B 47/00 (2013.01); G01D 5/14 (2013.01)] 13 Claims
OG exemplary drawing
 
10. A method of magnetic ranging comprising:
installing a sensor that senses a magnetic ranging signal in a wellbore;
installing a first electrically insulative gap sub in a wellbore;
installing at least one section of drill pipe in a wellbore that is connected to the electrically insulative gap sub;
connecting a surface power supply to at least one section of drill pipe using at least one wire, wherein the connection from at least one wire to the at least one section of drill pipe is a rigid connection;
energizing the power supply to cause current to flow down the drill pipe and inject into a wellbore formation and travel to a target well to create a magnetic ranging signal;
sampling the magnetic ranging signal;
adjusting the drilling operations to alter a characteristic of the drilling operations;
wherein the step of sampling the magnetic ranging signal occurs while drilling is taking place.