US 12,253,646 B2
Intelligent data acquisition for wireline logging
Yi-Qiao Song, Newton Center, MA (US); Yiqiao Tang, Belmont, MA (US); Mehdi Hizem, Houston, TX (US); Lukasz Zielinski, Arlington, MA (US); Michel Claverie, Cambridge, MA (US); and Zhanguo Shi, Houston, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 17/754,627
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Oct. 8, 2020, PCT No. PCT/US2020/054779
§ 371(c)(1), (2) Date Apr. 7, 2022,
PCT Pub. No. WO2021/072071, PCT Pub. Date Apr. 15, 2021.
Claims priority of provisional application 62/912,491, filed on Oct. 8, 2019.
Prior Publication US 2022/0365241 A1, Nov. 17, 2022
Int. Cl. G01V 3/32 (2006.01); G01V 3/34 (2006.01)
CPC G01V 3/32 (2013.01) [G01V 3/34 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method, comprising,
performing a nuclear magnetic resonance pre-log testing;
identifying a parameter for a portion of a signal from the pre-log testing with a long T1 and T2 value at each depth of the pre-log testing, T1 being a Longitudinal relaxation time, T2 being a transverse relaxation time ascertained from the nuclear magnetic resonance pre-log testing, the identifying a parameter including identifying a Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence wait time sufficient to detect the long T1 and T2;
determining which of the detected long T1 and T2 is longer;
identifying the determined longer of the detected long T1 and T2 as a target wait time;
constructing a logging program for a well-logging tool to improve a logging signal-to-noise (SNR) ratio or to reduce a logging time, the constructing including selecting, from among a plurality of predefined series of logging program CPMG wait times, a logging series of logging program CPMG wait times, the logging series being selected such that a shortest wait time in the selected logging series is a shortest wait time among the plurality of predefined series that is also longer than the target wait time; and
performing a logging operation in accordance with the constructed logging program, the performing the logging operation including setting CMPG wait times of the logging operation to be the selected logging series of logging program CPMG wait times.