Method for preconditioning oil shale preliminary to explosive ex

Details Method for preconditioning oil shale preliminary to explosive ex Method for preconditioning oil shale preliminary to explosive ex

1977-01-03

1978-08-29

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166259, 299 13, E21B 4326

Patent

active

041099648

ABSTRACT:
A technique is provided for forming, in a subterranean deposit containing oil shale, an in situ oil shale retort having boundaries of unfragmented deposit containing a fragmented permeable mass of particles containing oil shale. The technique is particularly useful where at least a portion of the deposition layers of the oil shale deposit within the boundaries of the retort being formed are bonded together as a competent or relatively strong bed resistant to fragmenting. A portion of the deposit within the boundaries of the retort being formed is excavated to form a void with a free face within the boundaries. A second portion of the deposit within the boundaries extending away from the free face includes at least one competent bed. At least one competent bed within the boundaries is fractured substantially parallel to the deposition layers for reducing the effective thickness of the competent bed. The portion of the deposit within the boundaries of the retort being formed is then explosively expanded toward the void with a single round of explosives for fragmenting this portion of the deposit and forming a fragmented permeable mass of particles in an in situ oil shale retort. The fragmented mass is retorted to produce liquid and gaseous products including shale oil.

REFERENCES:
patent: 3233668 (1966-02-01), Hamilton et al.
patent: 3464490 (1969-09-01), Silverman
patent: 3586377 (1971-06-01), Ellington
patent: 3593788 (1971-07-01), Parker
patent: 3677342 (1972-07-01), Silverman

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