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US3687228A
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Seismic impulse generation technique
Assignee: Individual
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Filing: 1970-12-14
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Granted: 1972-08-29
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Expires: 1990-12-14
Abstract
Abstract The specification discloses a technique for generating seismic impulses which includes suspending a plurality of discrete explosive charges one above the other. Detonation wires lead to detonation caps attached to each of the explosive charges. Circuitry generates a plurality of firing pulses which are applied to the detonation wires to sequentially explode the charges from top to bottom. All of the charges are detonated within a time interval less than the time required for the blast from the top charge to destroy the detonation wire leading to the bottom charge. The charges are sequentially detonated at time intervals substantially corresponding to the time of travel of an acoustic pulse through the formations between the adjacent charges.
Inventors
- 👤 Harold B Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:42
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/02; G01V1/04; G01V1/06; G01V1/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
The method of generating seismic impulses which comprises spacing a plurality of discrete explosive charges one above the other, and sequentially applying electrical pulses to detonation lines leading to said charges to detonate said charges from top to bottom within a time interval less than the time required for the blast from the top charge to destroy the detonation lines leading to the lower charges and at time intervals substantially corresponding to the time of travel of an acoustic pulse through the formations between adjacent charges.
Claim 2
Independent Claim
86 words
The method of generating seismic impulses which comprises spacing a plurality of discrete explosive charges one above the other, and sequentially applying electrical pulses to detonation lines leading to said charges to detonate said charges from top to bottom within a time interval less than the time required for the blast from the top charge to destroy the detonation lines leading to the lower charges and at time intervals substantially corresponding to the time of travel of an acoustic pulse through the formations between adjacent charges.
Claim 3
Independent Claim
73 words
The method of generating seismic impulses comprising: suspending a plurality of discrete explosive charges one above the other in a close relationship, generating a plurality of electrical pulses upon detonation wires leading to detonation caps attached to each of said charges, said electrical pulses being spaced within a time interval less than the time required for the resulting explosion from the upper charge to destroy the detonation wire leading to the lower charges.
Claim 4
Independent Claim
73 words
The method of generating seismic impulses comprising: suspending a plurality of discrete explosive charges one above the other in a close relationship, generating a plurality of electrical pulses upon detonation wires leading to detonation caps attached to each of said charges, said electrical pulses being spaced within a time interval less than the time required for the resulting explosion from the upper charge to destroy the detonation wire leading to the lower charges.
Claim 5
Dependent Claim
30 words
The method of claim 2 wherein the time intervals between said electrical pulses substantially corresponds to the time of travel of an acoustic wave through the formations between adjacent charges.
Claim 6
Independent Claim
119 words
A system for generating seismic impulses comprising: a plurality of discrete explosive charges suspended one above the other, detonation wires leading to detonation caps attached to each of said charges, circuit means for generating a plurality of firing pulses and for sequentially applying said pulses to ones of said detonation wires to sequentially explode said charges beginning with the upper charge, and said firing pulses being spaced within a time interval less than the time required for the explosion from the upper charge to destroy the detonation wire leading to the lower charges and said firing pulses being spaced apart by time intervals substantially corresponding to the time of travel of acoustic waves through the formations between adjacent charges.
Claim 7
Independent Claim
119 words
A system for generating seismic impulses comprising: a plurality of discrete explosive charges suspended one above the other, detonation wires leading to detonation caps attached to each of said charges, circuit means for generating a plurality of firing pulses and for sequentially applying said pulses to ones of said detonation wires to sequentially explode said charges beginning with the upper charge, and said firing pulses being spaced within a time interval less than the time required for the explosion from the upper charge to destroy the detonation wire leading to the lower charges and said firing pulses being spaced apart by time intervals substantially corresponding to the time of travel of acoustic waves through the formations between adjacent charges.
Claim 8
Dependent Claim
38 words
The system of claim 4 wherein said circuit means comprises: COUNTER means for sequentially generating electrical pulses, and silicon controlled rectifiers operable in response to said electrical pulses for applying relatively high current pulses to said detonation wires.
Claim 9
Dependent Claim
14 words
The system of claim 4 wherein said firing pulses are of the same amplitude.
References Cited (Backward Citations)
US2556299A
Cited
US3133231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |