Multi-stage method of operating an in situ oil shale retort

Details Multi-stage method of operating an in situ oil shale retort Multi-stage method of operating an in situ oil shale retort

1977-01-27

1978-02-07

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166245, 166259, E21B 4326, E21C 4110

Patent

active

040723500

ABSTRACT:
A method of processing oil shale in which an in situ oil shale retort comprising an elongated cavity containing a fragmented permeable mass of formation particles containing oil shale is formed in a subterranean formation containing oil shale to recover liquid and gaseous products. Access to the cavity is by a drift or conduit at each end of the cavity and through a drift at an intermediate position. A processing zone is established in the fragmented mass at one end of the cavity and processing gas is introduced at that end of the retort and heating of the fragmented mass of formation particles is conducted from that end towards the other end. Initially, off gas is withdrawn at the intermediate drift. When the processing zone passes the intermediate drift, processing gas is introduced through the intermediate drift and off gas including gaseous products is withdrawn by way of the drift at the other end. As the processing zone passes the intermediate drift, processing gas is introduced at one end and off gas is withdrawn from the other end of the retort.

REFERENCES:
patent: 2481051 (1949-09-01), Uren
patent: 3490529 (1970-01-01), Parker
patent: 3499489 (1970-03-01), Parker
patent: 3601193 (1971-08-01), Grady
patent: 3661423 (1972-05-01), Garrett
patent: 3692110 (1972-09-01), Grady

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