DRILLING cost controlMethod, then business case.
Main points: Cost accounting structure & Budget, Cost booklet, AFE, Daily well cost follow-up, monthly reconciliation for closure, monthly cost report, final well report.
Finance classification for wells operations.

OPEX cost Control
Method, then business case.
Main points: steps in a field live, OPEX Classification (vs ASC 932): Production / Transformation or transportation costs, with OPEX measurement; a mandatory structure: Routine, Non Routine, Structure and Other operating costs, attention & structuring points versus CR EXP 8, Budget & Opex costs follow up (Purchase To Pay, Closure, Estimated Final Cost, report)

LOGISTICS cost control
Method, then business case.
Main points: Classification of resources & main points / perimeter, Cost accounting structure, allocation