The hydraulic system plays an active role during drilling operations. Its proper design can accelerate the drilling effort and lower the overall well cost. It is very important to predict the exact pressure distribution along the well and the circulating temperature distributionin the fluid. This paper describes an innovative hydraulic computer porgram developed in Agip. The program calculates the rheological parameters of drilling fluid based on the viscometer readings. The rheological models of Newton. Bingham. Power law and Herschel-Bulkley are considered. The program calculates also the temperature profile of drilling fluid and takes into account the temperature effect on the rheological parameters. when available viscometer readings at different temperatures. The use of Herschel-Bulkley model and the temperature effect estimation improve the flow modelling capability during drilling fluid criculation and permits to better study and quantify the influence of hydraulic parameters, thus allowing better planning.
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