Rock bolting techniques for forming an in situ oil shale retort

Details Rock bolting techniques for forming an in situ oil shale retort Rock bolting techniques for forming an in situ oil shale retort

1979-11-02

1981-08-04

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 11, 299 13, 102311, E21C 4110

Patent

active

042818770

ABSTRACT:
A subterranean formation containing oil shale is prepared for in situ retorting by forming a fragmented permeable mass of formation particles containing oil shale in an in situ oil shale retort site. Formation is initially excavated from the retort site for forming one or more voids extending horizontally across the retort site, leaving a zone of unfragmented formation adjacent such a void. In one ambodiment, an array of rocks bolts are anchored in at least a portion of the roof adjacent such a void for providing reinforcement of unfragmented formation above the void. Vertical blasting holes are drilled in the zone of unfragmented formation adjacent the void. Explosive is placed in the blasting holes and detonated for explosively expanding the zone of unfragmented formation toward the void, including the rock bolted portion of the roof, for forming at least a portion of a fragmented permeable mass of formation particles containing oil shale in an in situ oil shale retort. Surprisingly, the rock bolting does not interfere with, and in some instances can improve, fragmentation compared with comparable blasts without such rock bolts. The reinforcement provided by the rock bolts can reduce or eliminate the need for roof support pillars in horizontal voids at intermediate levels of the retort site.

REFERENCES:
patent: 2846205 (1958-08-01), Bucky
patent: 3917346 (1975-11-01), Janssen
patent: 4036137 (1977-07-01), Dietrich
Mining Engineer Handbook, vol. 1, 1973, pp. 13-125 to 13-135.

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