|US 9,810,805 B2|
|Method and apparatus to detect a conductive body|
|Michael S. Bittar, Houston, TX (US); and Jing Li, Houston, TX (US)|
|Assigned to Halliburton Energy Services, Inc., Houston, TX (US)|
|Appl. No. 13/818,380
|Filed by Michael S. Bittar, Houston, TX (US); and Jing Li, Houston, TX (US)|
|PCT Filed Aug. 3, 2011, PCT No. PCT/US2011/046394
§ 371(c)(1), (2), (4) Date Feb. 22, 2013,
PCT Pub. No. WO2013/019224, PCT Pub. Date Feb. 7, 2013.
|Prior Publication US 2013/0154650 A1, Jun. 20, 2013|
|Int. Cl. G01V 3/28 (2006.01); G01V 3/26 (2006.01); E21B 47/022 (2012.01); G06F 17/00 (2006.01)|
|CPC G01V 3/26 (2013.01) [E21B 47/02216 (2013.01); G06F 17/00 (2013.01)]||29 Claims|
|1. A method comprising:
generating a probe signal into a formation below the earth's surface from a transmitting sensor of a tool disposed below the earth's surface;
receiving voltage signals in receiving sensors of the tool in response to generating the probe signal, the receiving sensors arranged in pairs to substantially cancel a magnetic field of a primary signal associated with the probe signal without rotating the receiving sensors to cancel the magnetic field of the primary signal and to capture a magnetic field of a secondary signal generated from a conductive body being a structure other than the formation and the tool, wherein the receiving sensors include two tilted sensors such that the two tilted sensors are arranged non-perpendicular to a longitudinal axis of the tool and oriented; and
determining an azimuthal angle associated with the conductive body using the voltage signals and a distance to the conductive body determined using a magnitude of the voltages signals, formation resistivity, and dielectric constant.