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US3874461A
Expired / Lapsed
US
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Perforating apparatus
Assignee: Western Company of North America
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Filing: 1973-08-16
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Granted: 1975-04-01
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Expires: 1993-08-16
Abstract
Abstract A perforating apparatus is provided with a charge receptacle having a groove in the receptacle outer wall. Upon detonation of a shaped charge, the wall portion surrounded by the groove is cleanly sheared away - leaving no burr on the receptacle wall. The sheared wall portion serves as a projectile in penetrating a well casing without leaving a burr on the casing wall.
Inventors
- 👤 Robert D Cocanower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:00
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
Perforating apparatus comprising: a charge carrier having a shaped charge carried therein, said carrier having in an outer wall surface thereof a groove defining a thin wall area, said groove surrounding a thicker wall area, said surrounded thicker wall area having a thickness greater than the thickness of said thin wall area over substantially the entire surrounded area.
Claim 2
Dependent Claim
58 words
Perforating apparatus comprising: a charge carrier having a shaped charge carried therein, said carrier having in an outer wall surface thereof a groove defining a thin wall area, said groove surrounding a thicker wall area, said surrounded thicker wall area having a thickness greater than the thickness of said thin wall area over substantially the entire surrounded area.
Claim 3
Dependent Claim
30 words
Perforating apparatus as defined by claim 1 wherein the thin wall area defined by the groove is approximately half the thickness of the carrier wall portion surrounded by the groove.
Claim 4
Dependent Claim
31 words
Perforating apparatus as defined by claim 1 further comprising: the shaped charge is mounted within the charge carrier and positioned substantially centrally of the receptacle wall portion surrounded by said groove.
Claim 5
Dependent Claim
21 words
Perforating apparatus as defined by claim 1 wherein the lowermost points along the bottom of the groove define an annular ring.
Claim 6
Dependent Claim
16 words
Perforating apparatus as defined by claim 1 wherein the charge carrier is a tubular cylindrical member.
Claim 7
Dependent Claim
39 words
Perforating apparatus as defined by claim 5 wherein said groove is annular, and wherein the bottom of the annular groove lies in substantially a flat plane, said plane being generally parallel to the longitudinal axis of the charge carrier.
Claim 8
Dependent Claim
58 words
A perforating charge receptacle adapted to receive shaped charges comprising: a tubular member having a shaped charge carried therein and having in an outer wall surface thereof an annular groove defining an annular receptacle wall portion having a thickness less than the thickness of the receptacle wall surrounded by the annular groove over substantially the entire surrounded area.
Claim 9
Dependent Claim
58 words
A perforating charge receptacle adapted to receive shaped charges comprising: a tubular member having a shaped charge carried therein and having in an outer wall surface thereof an annular groove defining an annular receptacle wall portion having a thickness less than the thickness of the receptacle wall surrounded by the annular groove over substantially the entire surrounded area.
Claim 10
Dependent Claim
36 words
A perforating charge receptacle as defined by claim 7 wherein the thinner annular receptacle wall portion defined by the annular groove is approximately half the thickness of the receptacle wall portion surrounded by the annular groove.
Claim 11
Dependent Claim
77 words
Perforating apparatus comprising in combination: a charge carrier having a wall formed as an integral body; a shaped charge mounted adjacent said wall for detonation along a predetermined path through said wall; and the improvement comprising a continuous groove in said wall defining a thin wall area, said groove surrounding a thicker wall area, said surrounded thicker wall area having a thickness greater than the thickness of said thin wall area over substantially the entire surrounded area.
Claim 12
Dependent Claim
77 words
Perforating apparatus comprising in combination: a charge carrier having a wall formed as an integral body; a shaped charge mounted adjacent said wall for detonation along a predetermined path through said wall; and the improvement comprising a continuous groove in said wall defining a thin wall area, said groove surrounding a thicker wall area, said surrounded thicker wall area having a thickness greater than the thickness of said thin wall area over substantially the entire surrounded area.
Claim 13
Dependent Claim
36 words
Perforating apparatus as defined by claim 9 including a plurality of shaped charges and a plurality of continuous grooves carried by said charge carrier each shaped charge disposed adjacent one of said grooves in said wall.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |