In situ oil shale retorts with gas barriers for maximizing produ

Details In situ oil shale retorts with gas barriers for maximizing produ In situ oil shale retorts with gas barriers for maximizing produ

1978-02-16

1979-12-04

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 19, E21C 4110

Patent

active

041768825

ABSTRACT:
A group of spaced apart in situ oil shale retorts is formed in a subterranean formation containing oil shale. At least one void is excavated in each retort site, and remaining formation within each retort site is explosively expanded toward such a void for forming a fragmented permeable mass of formation particles containing oil shale in each retort. A vertically extending partition of substantially unfragmented formation forms a gas barrier between the fragmented masses in a pair of adjacent retorts. Such a gas barrier yields structurally but retains sufficient integrity to inhibit gas flow between the fragmented masses of adjacent retorts. Such a gas barrier is sufficiently thin that it independently supports substantially the same proportionate amount of load from overburden at elevations above the retorts as the fragmented masses on either side of the gas barrier. Subsidence of such a gas barrier is substantially the same as subsidence of adjacent fragmented masses, permitting uniform subsidence of overburden.

REFERENCES:
patent: 1913395 (1933-06-01), Karrick
patent: 1919636 (1933-07-01), Karrick
patent: 3950029 (1976-04-01), Timmins
patent: 4025115 (1977-05-01), French et al.
patent: 4045085 (1977-08-01), Garrett
patent: 4047760 (1977-09-01), Ridley
"In situ Oil Shale-Resource Recovery" by H. E. McCarthy, American Chemical Soc. Meeting, 8-31-76.
Synthetic Fuels, pp. 2-21 to 2-24, Jun. 1975.

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