US 12,460,527 B2
Predicting formation-top depths and drilling performance or drilling events at a subject location
Cheolkyun Jeong, Sugar Land, TX (US); Yingwei Yu, Katy, TX (US); Velizar Vesselinov, Sugar Land, TX (US); Richard John Meehan, Houston, TX (US); and Priya Mishra, Menlo Park, CA (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 18/000,544
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed May 27, 2021, PCT No. PCT/US2021/034518
§ 371(c)(1), (2) Date Dec. 2, 2022,
PCT Pub. No. WO2021/247363, PCT Pub. Date Dec. 9, 2021.
Claims priority of provisional application 63/034,903, filed on Jun. 4, 2020.
Prior Publication US 2023/0212934 A1, Jul. 6, 2023
Int. Cl. E21B 44/00 (2006.01); E21B 47/00 (2012.01); G01V 1/50 (2006.01); G01V 20/00 (2024.01); G06F 30/20 (2020.01)
CPC E21B 44/00 (2013.01) [E21B 47/00 (2013.01); G01V 1/50 (2013.01); G06F 30/20 (2020.01); E21B 2200/20 (2020.05); G01V 20/00 (2024.01); G01V 2210/6652 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method comprising:
determining a location of a subject drill-well site;
identifying drill-well data for a plurality of drill-wells positioned within a threshold geographic area relative to the location of the subject drill-well site;
generating, utilizing the drill-well data for the plurality of drill-wells, formation-top trends for portions of the threshold geographic area located between respective positions of the plurality of drill-wells, wherein the generating the formation-top trends comprises:
identifying a first set of formation-top-depth covariances between the respective positions of the plurality of drill-wells;
identifying a second set of formation-top-depth covariances between the location of the subject drill-well site and the respective positions of the plurality of drill-wells; and
generating respective Kriging weights for applying to formation-top depths corresponding to the plurality of drill-wells based on the first set of formation-top-depth covariances and the second set of formation-top-depth covariances; and
determining, from the formation-top trends, the formation-top depths for formations corresponding to the location of the subject drill-well site.