Integrated support for drilling wells with abnormally high formation pressures

Background. Assessment of abnormal pressures during well drilling operations still remains an urgent task, as it allows ensuring accident-free well drilling and increasing drilling efficiency. Objective. To assess and forecast abnormal pressure conditions in areas of abnormally high reservoir pressures in terrigenous sediments, considering pressure growth with depth. Materials and methods. The research is based on the following materials: advanced logging while drilling and well logging data, exploration geophysics surveys, core material analysis results and drilling operation data. Results. The research findings, their detailed analysis and generalization for over 400 wells are applied in well planning, design and drilling operations across various regions. The main trends in the variation of abnormally high pressures across the area and stratigraphic section are described. The study presents the main characteristics and application possibilities of advanced logging while drilling and well logging data, as well as exploration geophysical methods (electrical prospecting and seismic surveys) in the analysis and forecasting of abnormally high pressures. Furthermore, the principal methods and methodologies for pressure determination and forecasting are reviewed. Conclusions. The relationship between pressure and depth follows a universal pattern, demonstrating a global planetary character. The main reason for abnormal pressures is rock compaction. However, deviations from this general principle exist in the form of localized areas with abnormally high formation pressures shaped by distinct influencing factors. Any alterations in rock properties, whether due to technological processes or geological factors affecting fluid volume in a sealed reservoir, result in pressure changes within these rock formations.