US 11,891,888 B2
Measuring formation properties and drilling mud properties using nuclear magnetic resonance in a wellbore
Songhua Chen, Katy, TX (US); and Rebecca Jachmann, Spring, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Sep. 15, 2021, as Appl. No. 17/475,574.
Prior Publication US 2023/0084875 A1, Mar. 16, 2023
Int. Cl. E21B 44/00 (2006.01); E21B 47/085 (2012.01); E21B 49/08 (2006.01); E21B 49/00 (2006.01)
CPC E21B 44/00 (2013.01) [E21B 47/085 (2020.05); E21B 49/005 (2013.01); E21B 49/0875 (2020.05)] 20 Claims
OG exemplary drawing
 
8. 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.