Method for detecting gain or loss of drilling fluid in a drilling installation associated calculation system and associated drilling installation

摘要

The present disclosure concerns a method for detecting gain or loss of drilling fluid in a drilling installation, said drilling installation comprising a drilling pipe, drilling fluid pits and a hydraulic connection between the pits and the drilling pipe. Said method comprises:providing (116, 118), during a first period, a set of measurement values (va_i,m; vc_j,m) representative of a volume of drilling fluid in each of the pits belonging to a predetermined group (112, 113); thenbased on volume measurement values, identifying (148) volume variations occurring during the first period for the pits of the predetermined group, each volume variation of a pit being associated with a volume variation period;calculating (162), for each measuring time (t_m), a corrected cumulated volume of drilling fluid (V′_m) for the pits of the predetermined group, based on the identified volume variation occurring in at least a sub-group (113) of the predetermined group, andestimating (163) a first value (A_m) for a gain or loss of drilling fluid at a measuring time (t_m) by comparing the corrected cumulated volume (V′_m) with an expected value (V₀).