Fremgangsmåte for å utføre brønnoperasjoner

A method and system for controlling the properties of a drilling fluid provided to a wellbore operation and/or for conducting a well operation. The method steps including: a. performing a wellbore operation using wellbore apparatus located in a wellbore; b. providing a fluid to the wellbore for facilitating the wellbore operation; c. measuring at least one property of the fluid or of cuttings carried by the fluid during performance of the wellbore operation; d. determining whether the measured fluid fulfils predetermined criteria, e. determining an alteration to the fluid provided to the wellbore using a fluid mixing model when said measured fluid does not fulfil the predetermined criteria and f. modifying the fluid provided to the wellbore using said determined alteration.