Patent ID: 9435184
Filing Date: 2016-09-06
CPC Classification: E21B

Claim Text:
1. An injection well liner for an underground coal gasification process, the injection well liner comprising: a proximal end and a distal end of the injection well liner through which an oxidizing gas is injected for an underground coal gasification process, the oxidizing gas being injected at the proximal end and output at a distal end of the injection well liner, the injection well liner having one or more liner portions and one or more sacrificial liner portions in between the one or more liner portions; and wherein each of the one or more sacrificial liner portions individually and entirely disintegrate due to a temperature during the underground coal gasification process so that each sacrificial liner and the liner portion connected to a distal end of each sacrificial liner fall off and the injection well liner is automatically shortened during the underground coal gasification process.