US 12,204,064 B2
Systems and methods for nuclear magnetic resonance (NMR) well logging)
Tianmin Jiang, Houston, TX (US); and Ronald J. M. Bonnie, Houston, TX (US)
Assigned to ConocoPhillips Company, Houston, TX (US)
Filed by ConocoPhillips Company, Houston, TX (US)
Filed on Jan. 24, 2023, as Appl. No. 18/100,876.
Claims priority of provisional application 63/302,391, filed on Jan. 24, 2022.
Prior Publication US 2023/0236337 A1, Jul. 27, 2023
Int. Cl. G01V 3/32 (2006.01); G01V 3/38 (2006.01)
CPC G01V 3/32 (2013.01) [G01V 3/38 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of well logging, the method comprising:
positioning a radio frequency (RF) pulse transmitter in a well bore hole at a well site;
generating a magnetic field in the well bore hole;
generating, using the RF pulse transmitter, an inversion pulse sequence;
generating, using the RF pulse transmitter, a Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence including a plurality of P180 RF pulses, wherein the magnetic field, the inversion pulse sequence, and the CPMG pulse sequence cause a nuclear magnetic resonance (NMR) response from a hydrocarbon pool within a transmission range of the RF pulse transmitter;
determining one or more spin magnetization values of the hydrocarbon pool from the NMR response after a P180 RF pulse of the plurality of P180 RF pulses; and
causing a well operation to be performed for the well site based on the one or more spin magnetization values.