US 11,680,479 B2
Multiple surface excitation method for determining a location of drilling operations to existing wells
Yijing Fan, Singapore (SG); Hsu-Hsiang Wu, Sugar Land, TX (US); and Li Pan, Singapore (SG)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Aug. 3, 2021, as Appl. No. 17/392,445.
Application 17/392,445 is a continuation of application No. 16/605,177, granted, now 11,111,776, previously published as PCT/US2018/063258, filed on Nov. 30, 2018.
Prior Publication US 2021/0363876 A1, Nov. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 47/0228 (2012.01); G01V 3/28 (2006.01); E21B 43/24 (2006.01)
CPC E21B 47/0228 (2020.05) [G01V 3/28 (2013.01); E21B 43/2406 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for determining a position of a wellbore, comprising:
inducing a first current to form a first magnetic field with a first source in a first conductive member disposed at a first location in Earth's surface, wherein the first location comprises a first distance from the wellbore and a first direction from the wellbore;
inducing a second current to form a second magnetic field with a second source in a second conductive member disposed at a second location in the Earth's surface, wherein the second location comprises a second distance from the wellbore and a second direction from the wellbore, and wherein the first location and the second location are not the same location;
inducing a third current into the first conductive member and the second conductive member at the same time with a third source by connecting the third source to both the first conductive member and the second conductive member;
emitting a third magnetic field into the formation;
disposing an electromagnetic sensor system into the wellbore, wherein the electromagnetic sensor system comprises one or more sensors;
recording the first magnetic field from the formation with the one or more sensors;
recording the second magnetic field from the formation with the one or more sensors; and
recording the third magnetic field from the formation with the one or more sensors.