US 12,411,259 B2
Phase-controlled excitation downhole nuclear magnetic resonance imaging device and method
Wei Liu, Beijing (CN); Wenxiu Zhang, Beijing (CN); and Wenxuan Chen, Houston, TX (US)
Assigned to Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing (CN)
Filed by Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing (CN)
Filed on Oct. 17, 2023, as Appl. No. 18/488,752.
Claims priority of application No. 202311137281.0 (CN), filed on Sep. 5, 2023.
Prior Publication US 2025/0076530 A1, Mar. 6, 2025
Int. Cl. G01V 3/32 (2006.01); G01R 33/36 (2006.01)
CPC G01V 3/32 (2013.01) [G01R 33/3621 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A phase-controlled excitation downhole nuclear magnetic resonance imaging device, comprising cylindrical antenna systems, an array antenna carrier, a slurry channel, a device frame, array antenna units, and a global antenna; the cylindrical antenna systems being uniformly arranged around a downhole nuclear magnetic resonance logging instrument and having the array antenna units equidistantly and uniformly distributed thereon; each array antenna unit being capable of achieving independent transmission and collection; the device frame being a cylindrical rod-like body made of a non-magnetic material, the center of an axis of the device frame being hollowed to form the slurry channel, the array antenna carrier being tightly wrapped at the periphery of the device frame, the inside of the array antenna carrier being provided with uniformly-distributed cavities for inserting the cylindrical antenna systems; and the array antenna units being assembled on the cylindrical antenna systems in a winding manner, and the global antenna being spirally wound on the array antenna carrier.