METHOD OF FASTENING THE WELL WITH LEADER IN THE SECTION OF PERMAFROST WITH HIGH ICE CONTENT Russian patent published in 2018 - IPC E21B43/10 E21B33/14 E21B36/00 

FIELD: construction.

SUBSTANCE: invention relates to construction of wells and can be used in equipping wells with a leader in permafrost with high ice content. According to the method, the borehole is fastened in the leader of permafrost with high ice content. For this, the wellbore is drilled to resistant rocks. Drilling is performed without flushing the well with drilling mud. They lower the leader consisting of casing pipes with a heat-insulating jacket. Leader is equipped with centering elements, a column shoe and a channel for monitoring the temperature along the entire length of the leader. When lowering the leader small diameter pipes are fixed on the outside of the leader. This forms an autonomous channel for cementing the leader. On this channel, the hollow space is filled from the face to the mouth with a grouting mortar. Simultaneously, the inner-column space is filled with an antifreeze liquid.

EFFECT: improving the quality of fastening the well and ensuring its operational reliability.

1 cl, 1 dwg