US 2024/0068844 A1 · MAG SENSE TOOL

Abstract

A magnetic sensing tool (“MST”) uses differentials in induced voltage to detect the approximate location of a ferric target tool within surface pressure control equipment associated with a wellhead. The MST comprises a transmitter coil and two receiver coils configured such that a voltage generated in the transmitter coil induces a baseline voltage, and a baseline voltage differential, in the receiver coils when no target tool is present. A target tool passing axially through the MST will disrupt the magnetic fields inducing the voltages, such that variations in the voltage differential can be used to detect the approximate location of the target tool. The MST can be deployed alone or in series depending on the requirements of detection of the target tool.

Claims9

Dependent claims

A magnetic sensing tool (“MST”) for detecting the approximate axial location of a target tool, comprising:

a generally cylindrical housing comprising a central longitudinal axis and configured such that the target tool may axially pass through from a first end to a second end of the housing;
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.

9 more elements

Dependencies are inferred from the claim text.

Mag sense tool

Life of this patent

Mag sense tool

Life of this patent

Abstract

Claims9