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US3611933A Expired / Lapsed US ⏱️ 0.0 years remaining

Nuclear cavity configuration control

Assignee: Phillips Petroleum Co
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Filing: 1967-12-29
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Granted: 1971-10-12
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Expires: 1987-12-29
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Abstract

Abstract The configuration of a nuclear cavity is controlled and/or enlarged by placing auxiliary conventional explosives, directional explosives or small nuclear charges approximately at the circumference of the chimney or cavity expected and exploding these simultaneously or sequentially before, during and/or after the nuclear shock to create a cavity of desired shape which preferably will be substantially cylindrical. In one embodiment, the invention is applied to the enlargement and control of the shape of the desired cylindrical hole or cavity shot in oil shale thus to substantially enlarge the underground retort volume and amount of shale oil which can be recovered from a given formation area. In an embodiment described, the auxiliary explosives surround the expected cavity just outside its circumference. There are placed in the roof as well as at different levels across the cross-sectional area of the expected hole additional auxiliary explosives wherewith to control the roof configuration and to further enlarge the cavity, if needed. Sequential drilling and exploding of a series of charges, especially in the area of the top of the cavity, is disclosed.

Inventors

  • 👤 William C Lanning

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 21:30
CPC Classifications
F; F42; F42D; F42D1/00

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 74 words
A method for controlling the size, enlargement and configuration of a nuclear shot cavity so that it will be substantially cylindrical throughout its length from top to bottom which comprises placing into the formation in which the cavity is formed adjacent the upper portion at places surrounding the periphery of the cavity conventional explosive charges which can be detonated to cause collapse of the walls of said cavity when formed and detonating said charges.
Claim 2
Independent Claim 74 words
A method for controlling the size, enlargement and configuration of a nuclear shot cavity so that it will be substantially cylindrical throughout its length from top to bottom which comprises placing into the formation in which the cavity is formed adjacent the upper portion at places surrounding the periphery of the cavity conventional explosive charges which can be detonated to cause collapse of the walls of said cavity when formed and detonating said charges.
Claim 3
Dependent Claim 36 words
A method according to claim 1 comprising placing the charges circumferentially at the upper portion of the cavity approximately at places which are near the largest circumference of the cavity projected upwardly after the nuclear shot.
Claim 4
Dependent Claim 42 words
A method according to claim 2 comprising arranging and exploding the charges so as to move the portion of the formation which overlies about the largest cross section of the cavity at least in part substantially radially and horizontally into the cavity.
Claim 5
Dependent Claim 20 words
A method according to claim 2 comprising placing the charges at several levels surrounding the upper portion of the cavity.
Claim 6
Dependent Claim 18 words
A method according to claim 2 comprising exploding at least some of the charges after the nuclear shot.
Claim 7
Dependent Claim 30 words
A method according to claim 2 comprising exploding at least some of the charges before the nuclear shot to provide a directional effect for the shock waves of the shot.
Claim 8
Dependent Claim 19 words
A method according to claim 2 compriSing exploding at least some of the charges simultaneously with the nuclear shot.
Claim 9
Dependent Claim 35 words
A method according to claim 1 comprising drilling to different depth holes to receive intermediate auxiliary conventional explosives to produce the desired configuration of the nuclear cavity and placing the detonating explosives in said holes.
Claim 10
Dependent Claim 53 words
A method according to claim 1 comprising placing conventional explosives just outside the perimeter of what would be the upwardly extended walls of a substantially cylindrical or otherwise uniformly shaped cavity and causing the explosives by exploding them to horizontally displace into the cavity the portion of the formation encompassed within said walls.
Claim 11
Dependent Claim 43 words
A method according to claim 1 comprising placing the conventional explosive charges circumferentially at the upper portion of the cavity in substantially concentrically disposed series and exploding an inner series before exploding an outer series, thus moving the overburden sequentially into the cavity.
Claim 12
Dependent Claim 36 words
A method according to claim 1 comprising scattering the shot holes over the cross section of the top of the nuclear cavity to assist in moving the walls thereof to accomplish better the substantially cylindrical configuration.

References Cited (Backward Citations)

US2630182A Cited
US3303881A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-10-11 1975-04-12 1975-10-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-10-11 1979-04-12 1979-10-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-10-11 1983-04-12 1983-10-12 $7700.00 Window Closed / Lapsed

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