WELL COMPLETION SYSTEM PROVIDING TIGHTNESS RELATIVE TO COATING LAYER Russian patent published in 2020 - IPC E21B23/06 E21B33/127 

FIELD: drilling of wells.

SUBSTANCE: present invention relates to well completion method for well completion system. Invention relates to application of annular barrier in cementless completion system of well, wherein annular barrier comprises metal pipe part, installed in the form of a part of the first metal tubular structure of the well located in the well shaft in the formation, at that, the annular barrier is located opposite the impermeable covering layer in the formation. Invention also relates to a well completion system for completion of a well having an aperture comprising a formation comprising a coating layer having an upper end and a lower end, a wellbore, passing through the coating layer and providing the presence of the inner surface of the coating layer, and the first metal tubular structure of the well, located in the wellbore, containing first annular barrier and second annular barrier. Each annular barrier comprises a metal pipe part, wherein the metal pipe part is installed in the form of part of the first metal tubular structure of the well, expansion tubular element, surrounding metal pipe part, wherein each end section of expansion tubular element is connected to metal pipe part, annular barrier space between metal tubular part and expansion tubular element, and release opening in metal pipe part, through which the pressurized fluid medium extends for expansion of the expanding tubular member and bringing the annular barrier from the unextended position into the opened position, wherein the first annular barrier is located near the upper end of the first metal tubular structure of the well, and in expanded position the tubular element of the first annular barrier covers the covering layer, and the second annular barrier is located at the lower end of the first metal tubular structure of the well, and in expanded position the tubular element of the second annular barrier covers the covering layer.

EFFECT: disclosed is well completion system providing tightness relative to coating layer.

21 cl, 8 dwg