US 2026/0153584 A1 · NUCLEAR MAGNETIC RESONANCE (NMR) RINGING NOISE MEASUREMENTS IN WELL SYSTEMS

Abstract

Systems, methods, and apparatus, including computer programs encoded on computer-readable media, for obtaining nuclear magnetic resonance (NMR) measurements of a subsurface formation in a well system. One or more NMR pulses are generated downhole using an NMR tool of the well system. It is determining whether an amplitude of an NMR echo signal is less than or equal to a threshold level or the NMR echo signal is not present. Ringing noise associated with the one or more NMR pulses is measured when the amplitude of the NMR echo signal is less than or equal to the threshold level or the NMR echo signal is not present. The ringing noise is cancelled from the NMR measurements, and properties of the subsurface formation are determined from the NMR measurements after cancelling the ringing noise.

Claims20

Dependent claims

A method for obtaining nuclear magnetic resonance (NMR) measurements of a subsurface formation in a well system, comprising:

generating one or more NMR pulses downhole using an NMR tool of the well system;
determining whether an amplitude of an NMR echo signal is less than or equal to a threshold level or the NMR echo signal is not present;
and
measuring ringing noise associated with the one or more NMR pulses when the amplitude of the NMR echo signal is less than or equal to the threshold level or the NMR echo signal is not present.

1 more element

A well system for obtaining nuclear magnetic resonance (NMR) measurements of a subsurface formation, the well system comprising:

an NMR tool configured to generate one or more NMR pulses downhole;
one or more processors;
and
a computer-readable storage medium having instructions stored thereon that are executable by the one or more processors to cause the well system to:
determine whether an amplitude of an NMR echo signal is less than or equal to a threshold level or the NMR echo signal is not present;
and
measure ringing noise associated with the one or more NMR pulses when the amplitude of the NMR echo signal is less than or equal to the threshold level or the NMR echo signal is not present.

4 more elements

A non-transitory computer-readable storage medium having instructions stored thereon that are executable by one or more processors of a well system, the well system for obtaining nuclear magnetic resonance (NMR) measurements of a subsurface formation, the instructions comprising:

instructions for generating one or more NMR pulses downhole using an NMR tool of the well system;
instructions for determining whether an amplitude of an NMR echo signal is less than or equal to a threshold level or the NMR echo signal is not present;
and
instructions for measuring ringing noise associated with the one or more NMR pulses when the amplitude of the NMR echo signal is less than or equal to the threshold level or the NMR echo signal is not present.

1 more element

Dependencies are inferred from the claim text.

Nuclear magnetic resonance (nmr) ringing noise measurements in well systems

Life of this patent

Nuclear magnetic resonance (nmr) ringing noise measurements in well systems

Life of this patent

Abstract

Claims20