WELL LINER FOR UNDERGROUND COAL GASIFICATION Russian patent published in 2016 - IPC E21B43/295 E21B43/10 C10J3/22 

FIELD: mining.

SUBSTANCE: invention relates to structural elements and a method for constructing the unit of well liner for underground coal gasification (UCG). In particular, disclosed is well liner segment for use in assembly structure of well liner for UCG for transportation of obtained gas to operating well. Segment includes a pipe for transportation of gas obtained as a result of UCG containing arranged on opposite sides open ends for connection of identical segments of well liner and perforation holes provided between the open end at opposite sides. Perforations are grouped with each other in one or several areas on the length of the pipe for transportation of gas obtained as a result of UCG with alternating with sections of pipe, do not contain perforations. Pipe for transportation of gas obtained as a result of UCG is made of metal and the well liner segment additionally contains a combustible shell.

EFFECT: technical result is improvement of efficiency of UCG equipment.

5 cl, 4 dwg