OVERVIEW OF UNDERBALANCED WELL COMPLETION TECHNOLOGIES

Depletion of oil fields, increase in the number of inclined and horizontal wells makes the problem of improving the quality of opening up productive deposits increasingly urgent. One of the ways to solve this problem is to develop specialized solutions for well completion, providing minimal contamination of the near-wellbore area by reducing the level of repression and filtration. The article is devoted to the analysis of oil well completion technologies under conditions of low reservoir pressures, which provide for opening up productive formations under depression conditions. When applying this technology, the conditions required to prevent possible gas, oil and water shows by regulating the properties of the drilling fluid when affecting the bottomhole formation zone are considered. The values of the critical density of drilling fluids are proposed to maintain the stability of clay rocks when using the technology under depression conditions when opening up productive formations. Methods for opening up formations under depression using coiled tubing drilling and booster technology are presented, the disadvantages and advantages of these technological solutions for increasing well productivity are considered.