Wells – Processes – Distinct – separate injection and producing wells
Patent
1986-06-30
1987-11-03
Metz, Andrew H.
Wells
Processes
Distinct, separate injection and producing wells
208431, 208435, 166272, 166266, E21C 4300
Patent
active
047037989
ABSTRACT:
Hydrocarbons may be recovered from subterranean oil shale deposits by penetrating the deposit with a well, applying hydraulic and/or explosive fracturing to the portion of the formation adjacent the well to form a zone of rubberized and/or fractured oil shale material and then introducing it to the treated portion of the formation a hydrogen doner solvent, preferably tetralin, in a sufficient volume to essentially fill all of the void spaces in the formation within the rubberized and fractured portion of the formation, and then applying hydrogen to the well and maintaining the hydrogen at a pressure range of from 50 to 500 and preferably from 250 to 350 pounds per square inch for a period of time in the range of from 50 to 600 and preferably 250 to 350 days, which causes a disintegration of the oil shale minerals. After this first stage pretreatment, the hydrogen is removed and a free-oxygen containing gas such as air is introduced into the pretreated portion of the oil shale deposit which removes organic fragments from the polymeric kerogen component of the oil shale by oxidative scission. A suitable solvent for the organic fragments is also present with the free oxygen containing gas. Fluids are recovered from the formation, since fluids including solvent and the organic fractions, which are separated by sublimation with the solvent being recycled.
REFERENCES:
patent: 3770398 (1973-11-01), Abraham et al.
patent: 3902422 (1975-09-01), Coursen
patent: 4220203 (1980-09-01), Steeman
patent: 4324641 (1902-04-01), Durai-Suamy
patent: 4547019 (1905-10-01), Warzel
patent: 4566964 (1986-01-01), Friedman
Caldarola Glenn
Metz Andrew H.
Park Jack H.
Priem Kenneth R.
Texaco Inc.
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