US 12,173,598 B1
Method and system for GR LWD curve optimization for deep-field oil and gas precise navigation
Fei Tian, Beijing (CN); Qingyun Di, Beijing (CN); Wenhao Zheng, Beijing (CN); Yongyou Yang, Beijing (CN); and Wenjing Cao, Beijing (CN)
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 Jan. 18, 2024, as Appl. No. 18/415,710.
Claims priority of application No. 202311346455.4 (CN), filed on Oct. 18, 2023.
Int. Cl. E21B 44/00 (2006.01); E21B 7/04 (2006.01); E21B 47/022 (2012.01); E21B 47/04 (2012.01); E21B 49/00 (2006.01); G01V 5/04 (2006.01)
CPC E21B 44/00 (2013.01) [E21B 7/04 (2013.01); E21B 47/022 (2013.01); E21B 47/04 (2013.01); E21B 49/00 (2013.01); G01V 5/04 (2013.01); G01V 5/045 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for obtaining a depth while drilling, comprising:
acquiring, using a drilling instrument, while drilling data;
acquiring historical data of a drilled well;
obtaining a real-time updated formation change-point detection result based on the while drilling data;
obtaining a pre-drilling predicted formation change-point detection result based on the data of the drilled well;
setting 4 control points with different depths based on the real-time updated formation change-point detection result and the pre-drilling predicted formation change-point detection result;
obtaining the depth while drilling based on the 4 control points by performing a depth transformation; and
detecting a lithologic parameter, and correcting the depth while drilling based at least on the detected lithologic parameter.