Measuring formation properties and drilling mud properties using nuclear magnetic resonance in a wellbore
AssigneeHalliburton Energy Services, Inc.
InventorsSonghua Chen, Rebecca Jachmann
Life of this patent
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Abstract
A measurement tool may be positioned downhole in a wellbore for measuring formation properties and drilling mud properties during a drilling operation. The measurement tool may include a body and an antenna. The body may include magnets for generating a magnetic field and a transmitter for transmitting a radiofrequency pulse. The antenna may be positioned proximate to the body to measure properties using nuclear magnetic resonant frequencies. The antenna may measure formation properties in a first volume of a formation using a first frequency. The antenna may measure drilling mud properties in a second volume in a borehole using a second frequency.
Claims20
A measurement tool comprising:
- a body;
- a transmitter configurable to emit a radiofrequency pulse;
- and
- an antenna positionable proximate to the body to measure, using nuclear magnetic resonance, (i) formation properties in a first volume of a formation using a first frequency and (ii) drilling mud properties in a second volume in a wellbore using a second frequency, wherein a frequency difference between the second frequency and the first frequency is greater than a bandwidth of the radiofrequency pulse emitted by the transmitter, wherein the antenna is configured to acquire the second frequency during a wait time for the first frequency.
A method comprising:
- positioning a measurement tool downhole in a wellbore;
- emitting, by a transmitter in the measurement tool, a radiofrequency pulse;
- measuring, by the measurement tool using a nuclear magnetic resonance, a plurality of nuclear magnetic resonance responses corresponding to a first frequency and a second frequency, a frequency difference between the second frequency and the first frequency being greater than a bandwidth of the radiofrequency pulse emitted by the transmitter, the second frequency being acquired during a wait time for the first frequency;
- transmitting, by the measurement tool, the plurality of nuclear magnetic resonance responses corresponding to the first frequency and the second frequency to a computing device;
- determining, by the computing device and using the plurality of nuclear magnetic resonance responses of the first frequency, formation properties in a first volume allocated inside a formation;
- and
- determining, by the computing device and using the plurality of nuclear magnetic resonance responses of the second frequency, drilling mud properties in a second volume allocated inside the wellbore.
A system comprising:
- a tubing string positionable downhole in a wellbore;
- a measurement tool positionable proximate to the tubing string and configurable to measure, using a nuclear magnetic resonance, a plurality of nuclear magnetic resonance responses corresponding to a first frequency and a second frequency, wherein a frequency difference between the second frequency and the first frequency is greater than a bandwidth of a radiofrequency pulse emitted by the measurement tool, wherein the measurement tool is configured to acquire the second frequency during a wait time for the first frequency;
- and
- a computing device communicatively coupleable to the measurement tool and comprising:
- a processing device;
- and
- a memory comprising instructions that are executable by the processing device for causing the processing device to:
- determine, using the plurality of nuclear magnetic resonance responses corresponding to the first frequency, formation properties in a first volume of a formation;
- and
- determine, using the plurality of nuclear magnetic resonance responses corresponding to the second frequency, drilling mud properties in a second volume of the wellbore.
Dependencies are inferred from the claim text.