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Title: Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort

Abstract

Formation is excavated from within a retort site in formation containing oil shale for forming a plurality of vertically spaced apart voids extending horizontally across different levels of the retort site, leaving a separate zone of unfragmented formation between each pair of adjacent voids. Explosive is placed in each zone, and such explosive is detonated in a single round for forming an in situ retort containing a fragmented permeable mass of formation particles containing oil shale. The same amount of formation is explosively expanded upwardly and downwardly toward each void. A horizontal void excavated at a production level has a smaller horizontal cross-sectional area than a void excavated at a lower level of the retort site immediately above the production level void. Explosive in a first group of vertical blast holes is detonated for explosively expanding formation downwardly toward the lower void, and explosive in a second group of vertical blast holes is detonated in the same round for explosively expanding formation upwardly toward the lower void and downwardly toward the production level void for forming a generally T-shaped bottom of the fragmented mass.

Inventors:
 [1]
  1. (Bakersfield, CA)
Issue Date:
Research Org.:
Occidental Oil Shale, Inc. (Grand Junction, CO)
OSTI Identifier:
863523
Patent Number(s):
4192554
Assignee:
Occidental Oil Shale, Inc. (Grand Junction, CO) OSTI
DOE Contract Number:  
FC20-78LC10036
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; explosive; expansion; horizontal; free; forming; situ; oil; shale; retort; formation; excavated; site; containing; plurality; vertically; spaced; apart; voids; extending; horizontally; levels; leaving; separate; zone; unfragmented; pair; adjacent; placed; detonated; single; fragmented; permeable; mass; particles; amount; explosively; expanded; upwardly; downwardly; void; production; level; cross-sectional; immediately; vertical; blast; holes; expanding; t-shaped; bottom; explosively expanding; expanding formation; permeable mass; formation particles; fragmented permeable; production level; particles containing; containing oil; retort site; fragmented mass; situ oil; shale retort; oil shale; spaced apart; unfragmented formation; level void; formation containing; vertically spaced; extending horizontally; separate zone; situ retort; horizontal free; particles contain; horizontal cross-section; /299/102/

Citation Formats

Ricketts, Thomas E. Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort. United States: N. p., 1980. Web.
Ricketts, Thomas E. Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort. United States.
Ricketts, Thomas E. Tue . "Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort". United States. https://www.osti.gov/servlets/purl/863523.
@article{osti_863523,
title = {Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort},
author = {Ricketts, Thomas E.},
abstractNote = {Formation is excavated from within a retort site in formation containing oil shale for forming a plurality of vertically spaced apart voids extending horizontally across different levels of the retort site, leaving a separate zone of unfragmented formation between each pair of adjacent voids. Explosive is placed in each zone, and such explosive is detonated in a single round for forming an in situ retort containing a fragmented permeable mass of formation particles containing oil shale. The same amount of formation is explosively expanded upwardly and downwardly toward each void. A horizontal void excavated at a production level has a smaller horizontal cross-sectional area than a void excavated at a lower level of the retort site immediately above the production level void. Explosive in a first group of vertical blast holes is detonated for explosively expanding formation downwardly toward the lower void, and explosive in a second group of vertical blast holes is detonated in the same round for explosively expanding formation upwardly toward the lower void and downwardly toward the production level void for forming a generally T-shaped bottom of the fragmented mass.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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