The work is devoted to the experience of creation and implemention of digital solutions in the Petroleum Industry of Serbia (Serbian: NIS). The paper detaily examines digital projects which applied data science, machine learning/deep learning in seismic, petrophysics, geology, reservoir engineering and production technology. These projects aimed to solve current challenges of brown fields at a late stage of operation, as well as in working with sand-bearing well stock, control of scale and efficient development of fractured reservoirs.