US3707188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non collapse stemming of casing subjected to explosive effects
Assignee: United States Atomic Energy Commission
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Filing: 1971-04-27
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Granted: 1972-12-26
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Expires: 1991-04-27
Abstract
Abstract Tubular casing is installed along a formation interval through which open communication is to be preserved or established in proximity to an explosive device, particularly, a nuclear explosive. The casing is then filled, i.e., is stemmed with a fluidic agent having dilatant properties. When subjected to the severe stresses product by detonation of the explosive the dilatant agent is transitorally transformed into a rigid incompressible form which prevents buckling and crushing of the casing. Upon dimination of the stress the agent returns to a fluidic form which may drain or otherwise fugitively depart from the casing providing open communication therethrough.
Inventors
- 👤 Richard A Heckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/263; E21B43/2635
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A process as defined in claim 1 wherein said formation interval is in a petroliferous formation, wherein said shot points are in gaseous or fluidic hydRocarbon bearing strata and said casing is disposed in barren strata situated between said shot points so that flow of said hydrocarbon from said strata is stimulated and flow thereof between said respective cavity-chimney-fracture zone systems through said casing occurs.
Claim 2
Dependent Claim
20 words
A process as defined in claim 2 wherein said dilatant agent comprises a liquid vehicle and a dispersed particle phase.
Claim 3
Dependent Claim
66 words
A process as defined in claim 2, wherein portions of said well bore above said upper shot point is also provided with a tubular casing, wherein the aforesaid casing is also sealed at the lower end with a displaceable seal means and wherein the aforesaid casing is also filled with fluidic dilatant stemming agent, so as to provide communication to the upper cavity-chimney fracture zone system.
Claim 4
Dependent Claim
27 words
A process as defined in claim 3 wherein said vehicle is a liquidic material selected from the group consisting of water, hydrocarbon, silicane, tricresyl phosphate and tetralin.
Claim 5
Dependent Claim
33 words
A process as defined in claim 5 wherein said dispersed particle phase is a particulate form of a meterial selected from the group consisting of starch, silica, insoluble silicates, glass and carbon black.
Claim 6
Dependent Claim
24 words
A process as defined in claim 6 wherein said vehicle comprises water, said particle phase comprises starch and a vegetable gum deflocculant is included.
Claim 7
Dependent Claim
35 words
A process as defined in claim 7 wherein said dilatant agent comprises about 50 parts by weight of water, about 50 parts by weight of starch and about 0.25 parts by weight of guar gel.
Claim 8
Dependent Claim
64 words
A process as defined in claim 4 wherein the upper and lower ends of said tubular well casing section between said upper and lower shot points is disposed within the expected vaporization zone of the nuclear devices emplaced proximate thereto and wherein the lower end of the casing above the upper shot point is disposed within the vaporization zone of the upper nuclear explosive.
References Cited (Backward Citations)
US2707436A
Cited
US2965172A
Cited
FR1279994A
Cited
US3303881A
Cited
US3404919A
Cited
US3620301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |