Patent ID: 9175452
Filing Date: 2015-11-03
Classification: E02D,E21B

Abstract:
1. A method for filling a subterranean void, the method comprising: injecting a foam-fluidized granular fill material into the void and leaving the granular material in the void, the injecting being at an injection point beneath a surface of water within the void, wherein the foam-fluidized granular fill material is injected at a velocity sufficient for the foam-fluidized granular fill material to expand laterally within the void at least two times more than if the granular fill material was not foam-fluidized and to displace the water, and wherein foam within the foam-fluidized granular fill material dissipates, rather than being removed from the void, as the foam-fluidized granular fill material expands laterally within the void, thus self-compacting the granular fill material.