US 12,339,140 B2
Mag sense tool
Jimmy Livingston, Manvel, TX (US); and Phillip R. Phelps, Fort Worth, TX (US)
Assigned to OIL STATES ENERGY SERVICES, L.L.C., Houston, TX (US)
Filed by Jimmy Livingston, Manvel, TX (US); and Phillip R. Phelps, Fort Worth, TX (US)
Filed on Aug. 23, 2022, as Appl. No. 17/893,301.
Prior Publication US 2024/0068844 A1, Feb. 29, 2024
Int. Cl. G01D 5/22 (2006.01); G01B 7/00 (2006.01)
CPC G01D 5/2291 (2013.01) [G01B 7/003 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A magnetic sensing tool (“MST”) for detecting the approximate axial location of a target tool having an outer diameter, comprising:
a generally cylindrical housing comprising a central longitudinal axis and an inner diameter greater than the outer diameter of the target tool; and
a plurality of coils disposed about the housing, comprising:
an upper receiver coil;
a lower receiver coil;
a central transmitter coil connected to a power source configured to generate a voltage in the transmitter coil; and
a sensor configured to measure the voltage within each of the plurality of coils;
wherein the plurality of coils are configured such that:
when there is no target tool disposed within the housing, a first baseline voltage is induced in the upper receiver coil and a second baseline voltage is induced in the lower receiver coil; and
the presence of a target tool within the housing causes the induced voltage in at least one of the upper and lower receiving coils to decrease from the baseline voltage.