Initial evaluation of fracturing oil shale with propellants for in situ retorting, Phase 2

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A series of field experiments was carried out to gather preliminary information on the use of propellant charges to create horizontal fractures in oil shale beds for in situ retorting. Development of a propellant tool specifically designed to create horizontal fractures, and testing of various sizes and designs of the tool to create fractures in oil shale beds were carried out simultaneously. Ten prototype tools with energy yields from 2 pounds to 60 pounds were fired at depths ranging from 10 feet to 60 feet. Ten preshot observation holes and 13 postshot core holes were used to gather information and ... continued below

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Pages: (40 p)

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Lekas, M.A.; Lekas, J.M. & Strickland, F.G. May 1, 1991.

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A series of field experiments was carried out to gather preliminary information on the use of propellant charges to create horizontal fractures in oil shale beds for in situ retorting. Development of a propellant tool specifically designed to create horizontal fractures, and testing of various sizes and designs of the tool to create fractures in oil shale beds were carried out simultaneously. Ten prototype tools with energy yields from 2 pounds to 60 pounds were fired at depths ranging from 10 feet to 60 feet. Ten preshot observation holes and 13 postshot core holes were used to gather information and to serve as injection wells to inject air into the formation for permeability tests. Most shots vented large volumes of gas or water from observation holes 13 to 20 feet distant, indicating that a horizontal fracture communicating from the shot point to the observation hole had been created. Shot-related horizontal fracturing was noted in most core holes at the same depth as the shot point. Air injection tests on all holes showed a significant increase in permeability after the shots.

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Pages: (40 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92001146
  • Report No.: DOE/MC/11076-3064
  • Grant Number: FC21-86MC11076
  • DOI: 10.2172/5602591 | External Link
  • Office of Scientific & Technical Information Report Number: 5602591
  • Archival Resource Key: ark:/67531/metadc1093781

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Office of Scientific & Technical Information Technical Reports

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  • May 1, 1991

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 5, 2018, 6:46 p.m.

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Lekas, M.A.; Lekas, J.M. & Strickland, F.G. Initial evaluation of fracturing oil shale with propellants for in situ retorting, Phase 2, report, May 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1093781/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.