185 Oil and gas engineering and technologies

Master

Analysis of Technologies for Preventing Drilling-Fluid Losses During Deep Well Drilling

Misan, A.R.

The thesis is aimed at solving a relevant and practically significant scientific and engineering problem, namely the selection and substantiation of optimal methods and a set of measures to prevent drilling-fluid losses during the construction of oil and gas wells. Particular attention is given to cases where partial losses develop into total loss of circulation, since such complications directly affect drilling performance, wellbore stability, the level of operational incidents, and the economic efficiency of well construction.
Within the study, the causes and mechanisms of fluid losses under various mining and geological conditions are systematized, and the technological tools for their prevention are analyzed – from adjusting drilling-fluid properties and hydraulics to applying specialized materials and technical solutions in the loss zone. Based on this, an action algorithm for mitigating loss of circulation is developed, which includes a sequence of rapid diagnostics, selection of an appropriate response strategy, monitoring the effectiveness of the implemented measures, and criteria for switching to alternative solutions when the results are insufficient. Thus, the work aims not only to describe individual methods, but also to create a structured decision-making framework that reduces operational risks and improves the reliability of the drilling process.

бурові розчини

поглинання

втрата циркуляції

well

drilling fluid

fluid loss

loss of circulation