US4038112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well-fracturing explosive composition
Assignee: Talley Frac Corp
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Filing: 1975-05-12
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Granted: 1977-07-26
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Expires: 1995-05-12
Abstract
Abstract A nitrate or nitroparaffin-base liquid exlosive composition having a small critical diameter yet which is essentially free of particulate metals such as may render such compositions unduly brisant or susceptible to decomposition, and which is consistent with the safety requirements of geological fracturing, including an inert solid ballistic modifier having a sonic velocity substantially different from that of the explosive material in the composition and an average particle size of less than 10 microns, forming from about 5% to 20% by weight of the composition.
Inventors
- 👤 Leo K. Asaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:12
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/007; C06B25/00; C06B25/36; C06B25/38; Y; Y10; Y10S; Y10S149/00; Y10S149/11
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
In a liquid explosive composition for geological fracturing having a nitroparaffin or nitrate base, the improvement comprising between 5 and 20 weight percent of a ballistic modifier in the form of finely divided inert non-reactive solids, the particles of which are substantially homogeneous, having a sonic velocity substantially different from that of the remainder of the composition and having a particle size less than about 10 microns.
Claim 2
Dependent Claim
67 words
In a liquid explosive composition for geological fracturing having a nitroparaffin or nitrate base, the improvement comprising between 5 and 20 weight percent of a ballistic modifier in the form of finely divided inert non-reactive solids, the particles of which are substantially homogeneous, having a sonic velocity substantially different from that of the remainder of the composition and having a particle size less than about 10 microns.
Claim 3
Dependent Claim
31 words
A liquid explosive composition as defined in claim 1 wherein the concentration of the ballistic modifier is sufficient to render the critical diameter of the composition less than about 1/64 inch.
Claim 4
Dependent Claim
42 words
A liquid explosive composition as defined in claim 1 wherein the ballistic modifier is a solid selected from the group consisting of sand, alumina, crushed rock, marble, glass, clay and metal oxides, having an average particle size less than about 5 microns.
Claim 5
Dependent Claim
76 words
A liquid explosive composition suitable for geological fracturing comprising essentially by weight percent about 40-75% nitroparaffin, about 5-30% blasting gelatin, about 5-20% inert non-reactive solid ballistic modifier, the particles of which are substantially homogeneous, with an average particle size less than 10 microns and having a sonic velocity substantially different from that of the remainder of the composition, and about 1-8% stabilizers and processing aids including thickening agents sufficient to maintain the homogeneity of the composition.
Claim 6
Dependent Claim
76 words
A liquid explosive composition suitable for geological fracturing comprising essentially by weight percent about 40-75% nitroparaffin, about 5-30% blasting gelatin, about 5-20% inert non-reactive solid ballistic modifier, the particles of which are substantially homogeneous, with an average particle size less than 10 microns and having a sonic velocity substantially different from that of the remainder of the composition, and about 1-8% stabilizers and processing aids including thickening agents sufficient to maintain the homogeneity of the composition.
Claim 7
Dependent Claim
46 words
A liquid explosive as defined in claim 4 comprising essentially 58% nitromethane, 20% blasting gelatin, 10% silicon dioxide with an average particle size of about 3 microns, 7% cyclotrimethylenetrinitramine, and 5% stabilizers and processing aids, including sufficient thickening agents to maintain the homogeneity of the composition.
Claim 8
Independent Claim
72 words
A method of reducing the critical diameter of a nitroparaffin or nitrate-based liquid explosive composition suitable for geological fracturing without unduly increasing its brisance, comprising adding thereto between about 5 and 20 weight percent of a solid inert non-reactive ballistic modifier, the particles of which are substantially homogeneous, having an average particle size less than about 10 microns and a sonic velocity substantially different from that of the remainder of such composition.
Claim 9
Independent Claim
72 words
A method of reducing the critical diameter of a nitroparaffin or nitrate-based liquid explosive composition suitable for geological fracturing without unduly increasing its brisance, comprising adding thereto between about 5 and 20 weight percent of a solid inert non-reactive ballistic modifier, the particles of which are substantially homogeneous, having an average particle size less than about 10 microns and a sonic velocity substantially different from that of the remainder of such composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |