Method of bulking an in situ oil shale retort substantially full

Details Method of bulking an in situ oil shale retort substantially full Method of bulking an in situ oil shale retort substantially full

1980-10-30

1982-11-23

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

102312, 299 13, E21C 4110

Patent

active

043602339

ABSTRACT:
A method for forming an in situ oil shale retort in a subterranean formation containing oil shale is provided. The in situ oil shale retort has a top boundary, generally vertically extending side boundaries, and a bottom boundary of unfragmented formation. A first portion of formation is excavated for forming at least one void within the boundaries, leaving a remaining portion of formation within the boundaries adjacent the void or voids. A remaining portion of unfragmented formation within the retort boundaries is explosively expanded toward such a void for forming a fragmented permeable mass of formation particles containing oil shale in the retort. A void space remains between the upper surface of the fragmented mass and overlying unfragmented formation. A lower portion of the overlying formation is explosively expanded downwardly toward the void space for substantially filling the retort with formation particles. A sill pillar of unfragmented formation is left extending between an air level base of operation and the top boundary of the retort being formed.

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