公开(公告)号：US20180334897A1

公开(公告)日：2018-11-22

申请号：US15779494

申请日：2015-12-31

Applicant: Landmark Graphics Corporation

Inventor： Robello SAMUEL ,  Zhengchun LIU ,  Yu CHEN ,  Jie HE

IPC: E21B44/02 ,  E21B49/00 ,  E21B7/04 ,  G01V5/10 ,  G01V1/30

CPC classification number: E21B44/02 ,  E21B7/04 ,  E21B44/00 ,  E21B49/003 ,  G01V1/306 ,  G01V5/10 ,  G01V2210/6222

Abstract: Automated planning, control and/or geosteering assistance for a subterranean drilling operation is performed using an analytical drilling performance model that is a function of a rock brittleness index that is correlated with a corresponding formation property metric which serves as brittleness correlate and for which applicable measurement values are available from log data pertaining to the relevant formation. Correlation between the brittleness index and the brittleness correlate is such that a particular brittleness correlate value indicates a unique corresponding brittleness index value. One embodiment of the drilling performance model expresses rate of penetration as a function of a B4 brittleness index correlated with a sonic log brittleness correlate provided by pressure-wave velocity.