Downhole delay assembly for blasting with series delay

Details Downhole delay assembly for blasting with series delay Downhole delay assembly for blasting with series delay

1980-07-15

1982-09-07

Nelson, Peter A.

Ammunition and explosives

Igniting devices and systems

Fuse cord

1022757, 10227511, 10227512, C06C 504

Patent

active

043477895

ABSTRACT:
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.

REFERENCES:
patent: Re30621 (1981-05-01), Calder, Jr. et al.
patent: 3618519 (1971-11-01), Griffith
patent: 3987732 (1976-10-01), Spraggs et al.
patent: 3987733 (1976-10-01), Spraggs et al.
patent: 4144814 (1979-03-01), Day et al.
patent: 4166418 (1979-09-01), Calder, Jr.
patent: 4167139 (1979-09-01), Gleason et al.
patent: 4210366 (1980-07-01), Hutchins et al.
patent: 4238136 (1980-12-01), Ricketts
patent: 4239285 (1980-12-01), French
patent: 4281878 (1981-08-01), Ricketts

Affiliated with

Also associated with

Rating

Downhole delay assembly for blasting with series delay does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Downhole delay assembly for blasting with series delay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downhole delay assembly for blasting with series delay will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1337568