US3670828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive drilling apparatus
Assignee: Sunoco Inc
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Filing: 1970-02-11
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Granted: 1972-06-20
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Expires: 1990-02-11
Abstract
Abstract The particular embodiment described herein as illustrative of one form of the invention utilizes an elongated housing having a shaped explosive charge in one end thereof, and a firing mechanism for detonating the explosive charge upon impact of the capsule with the lower end of the borehole. During borehole drilling operations, the capsule is released into a fluid stream and moved to the bottom of the hole with the fluid stream. The capsule then exits through the end of the drill stem and impacts the formation whereupon it is detonated to serve as an auxilliary means for drilling the borehole.
Inventors
- 👤 John D Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:04
CPC Classifications
F; F42; F42B; F42B1/00; F42B1/02; E; E21; E21B; E21B7/00; E21B7/007; F42B3/00; F42B3/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
An explosive apparatus for use in drilling wellbores comprising: an elongated cylindrical housing shorter in length than the diameter of said wellbore; an explosive charge positioned within said housing; explosive initiating means positioned adjacent said explosive charge and reactive to sudden deceleration of said housing; and flexible stabilizer means extending from the upper end of said housing whose length when added with the length of the housing exceeds the diameter of said wellbore.
Claim 2
Dependent Claim
73 words
An explosive apparatus for use in drilling wellbores comprising: an elongated cylindrical housing shorter in length than the diameter of said wellbore; an explosive charge positioned within said housing; explosive initiating means positioned adjacent said explosive charge and reactive to sudden deceleration of said housing; and flexible stabilizer means extending from the upper end of said housing whose length when added with the length of the housing exceeds the diameter of said wellbore.
Claim 3
Dependent Claim
49 words
The apparatus of claim 1 wherein the explosive initiating means includes a primer; a detonator located in said primer; impacting means free to move in response to acceleration and deceleration of said housing; and firing cap means interposed between and adjacent to said impacting means and said detonator means.
Claim 4
Dependent Claim
27 words
The apparatus of claim 1 wherein said flexible stabilizer means is made of a resilient material and has means for absorbing compressive forces encountered in said wellbore.
Claim 5
Dependent Claim
55 words
The apparatus of claim 1 wherein said housing has an opening in its upper end and wherein the lower portion of said flexible stabilizer means fills the opening in the upper portion of said housing and wherein the upper portion of said stabilizer is a cylindrical tail member of a smaller diameter than said housing.
Claim 6
Dependent Claim
38 words
The apparatus of claim 1 wherein said explosive charge comprises a shaped charge which is spaced from the lower end of said housing and wherein said housing is substantially smaller in diameter than the diameter of said wellbore.
Claim 7
Dependent Claim
68 words
In an explosive apparatus passable through drill pipe for use in drilling wellbores, having contained in an elongated cylindrical housing, an explosive and means for initiating the explosive which is responsive to deceleration of the housing, the improvement comprising: flexible stabilizer means attached to the upper end of said housing wherein the overall length of the stabilizer means together with said housing exceeds the diameter of said wellbore.
Claim 8
Dependent Claim
68 words
In an explosive apparatus passable through drill pipe for use in drilling wellbores, having contained in an elongated cylindrical housing, an explosive and means for initiating the explosive which is responsive to deceleration of the housing, the improvement comprising: flexible stabilizer means attached to the upper end of said housing wherein the overall length of the stabilizer means together with said housing exceeds the diameter of said wellbore.
Claim 9
Dependent Claim
26 words
The apparatus of claim 6 wherein the stabilizer means has an elongated cylindrical upper portion having a diameter substantially smaller than the diameter of said housing.
Claim 10
Dependent Claim
50 words
The apparatus of claim 7 including seal means positioned between the housing and the stabilizer means so that the pressure differential developed across the attachment between the housing and the stabilizer means will tend to maintain the attachment when the explosive apparatus is subjected to pressure in the drill pipe.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |