Downhole delay assembly for blasting with series delay
Patent
·
OSTI ID:864325
- Grand Junction, CO
A downhole delay assembly is provided which can be placed into a blasthole for initiation of explosive in the blasthole. The downhole delay assembly includes at least two detonating time delay devices in series in order to effect a time delay of longer than about 200 milliseconds in a round of explosions. The downhole delay assembly provides a protective housing to prevent detonation of explosive in the blasthole in response to the detonation of the first detonating time delay device. There is further provided a connection between the first and second time delay devices. The connection is responsive to the detonation of the first detonating time delay device and initiates the second detonating time delay device. A plurality of such downhole delay assemblies are placed downhole in unfragmented formation and are initiated simultaneously for providing a round of explosive expansions. The explosive expansions can be used to form an in situ oil shale retort containing a fragmented permeable mass of formation particles.
- Assignee:
- Occidental Oil Shale, Inc. (Grand Junction, CO)
- Patent Number(s):
- US 4347789
- OSTI ID:
- 864325
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/102/
200
assemblies
assembly
assembly provides
blasthole
blasting
connection
containing
delay
delay assembly
delay device
detonating
detonation
device
devices
downhole
downhole delay
effect
expansions
explosions
explosive
form
formation
formation particles
fragmented
fragmented permeable
housing
initiated
initiates
initiation
mass
milliseconds
oil
oil shale
particles
permeable
permeable mass
placed
plurality
prevent
protective
provided
provides
providing
response
responsive
retort
series
shale
shale retort
simultaneously
situ
situ oil
time
time delay
unfragmented
unfragmented formation
200
assemblies
assembly
assembly provides
blasthole
blasting
connection
containing
delay
delay assembly
delay device
detonating
detonation
device
devices
downhole
downhole delay
effect
expansions
explosions
explosive
form
formation
formation particles
fragmented
fragmented permeable
housing
initiated
initiates
initiation
mass
milliseconds
oil
oil shale
particles
permeable
permeable mass
placed
plurality
prevent
protective
provided
provides
providing
response
responsive
retort
series
shale
shale retort
simultaneously
situ
situ oil
time
time delay
unfragmented
unfragmented formation