METHOD TO SEAL BOREHOLE AND DEVICE TO THIS END Russian patent published in 2015 - IPC E21B33/127 

FIELD: oil and gas industry.

SUBSTANCE: device for the borehole sealing includes a well screen unit having the upper end and a segment of an imperforated bearing tube close to the upper end, a withdrawable unit, a mechanical packer and a bypass tool and a swellable packer. The withdrawable unit is placed at the upper end of the imperforated bearing tube. The Bypass tool is placed over the withdrawable unit. The swellable packer is made of a swelling material fixed to the outer side of the imperforated bearing tube and has the first diameter and the second diameter bigger than the first one. The device is made with the potential gravel packing of the well before installation and further removal of the mechanical packer, injection of gravel slurry through the bypass tool to the annular space between the well screen unit and the wellbore wall and sealing of the annular space by the swellable packer. Removal of the mechanical packer and the bypass tool is made by means of the withdrawable unit disconnection.

EFFECT: invention ensures perfection of the device design that does not require additional round trips.

22 cl, 5 dwg