Patent US3855855A successfully refreshed from Google Patents.
US3855855A
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Impression packer
Assignee: Chevron USA Inc
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Filing: 1973-06-25
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Granted: 1974-12-24
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Expires: 1993-06-25
Abstract
Abstract An impression packer for use in obtaining impressions in wells and having an impression sleeve formed of a mixture of synthetic nitrile rubber, natural rubber smoked sheet, silica powder and rubber processing oil.
Inventors
- 👤 S Hutchinson
- 👤 G Anderson
- 👤 G Newby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:16
CPC Classifications
F; F16; F16L; F16L55/00; C; C08; C08L; C08L9/00; C08L9/02; E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/1208; C08L7/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
AN IMPRESSION PACKER COMPRISING A TUBING SECTION, AN ELONGATED RESILIENT SLEEV POSITIONED OVER SAID TUBING SECTION MEANS CONNECTING THE ENDS OF SAID SLEEVE IN FLUID-TIGHT RELATIONSHIP WITH SAID TUBING SECTION TO FORM AN ANNULAR CHAMBER BETWEEN SAID TUBING SECTION AND SAID SLEEVE, PORT ME N MUNICATING WITH SAID ANNULAR CHAMBER FOR INFLATING SAID RESILIENT SLEEVE AND AN IMPRESSION SLEEVE CONNECTED TO SAID RESIL IENT SLEEVE FOR EXPANSION AND CONTRACTING THEREWITH, SAID IMPRESSION SLEEVE COMPRISING A SMOOTH ROOLED SHEET CONTAINING ABOUT 60 TO 80 PERCENT BY WEIGHT SYNTHETIC NITRILE RUBBER, ABOUT 10 TO 20 PERCENT BY WEIGHT NATURAL RUBBER SMOKED SHEET, ABOUT 5 TO 15 PERCENT BY WEIGHT HYDRATED AMSMOKED
Claim 2
Dependent Claim
109 words
AN IMPRESSION PACKER COMPRISING A TUBING SECTION, AN ELONGATED RESILIENT SLEEV POSITIONED OVER SAID TUBING SECTION MEANS CONNECTING THE ENDS OF SAID SLEEVE IN FLUID-TIGHT RELATIONSHIP WITH SAID TUBING SECTION TO FORM AN ANNULAR CHAMBER BETWEEN SAID TUBING SECTION AND SAID SLEEVE, PORT ME N MUNICATING WITH SAID ANNULAR CHAMBER FOR INFLATING SAID RESILIENT SLEEVE AND AN IMPRESSION SLEEVE CONNECTED TO SAID RESIL IENT SLEEVE FOR EXPANSION AND CONTRACTING THEREWITH, SAID IMPRESSION SLEEVE COMPRISING A SMOOTH ROOLED SHEET CONTAINING ABOUT 60 TO 80 PERCENT BY WEIGHT SYNTHETIC NITRILE RUBBER, ABOUT 10 TO 20 PERCENT BY WEIGHT NATURAL RUBBER SMOKED SHEET, ABOUT 5 TO 15 PERCENT BY WEIGHT HYDRATED AMSMOKED
Claim 3
Dependent Claim
120 words
An impression packer comprising a tubing section, an elongated resilient sleeve positioned over said tubing section, means connecting the ends of said sleeve in fluid-tight relationship with said tubing section to form an annular chamber between said tubing section and said sleeve, port means communicating with said annular chamber for inflating said resilient sleeve and an impression sleeve connected to said resilient sleeve for expansion and contraction therewith, said impression sleeve comprising a smooth rolled sheet containing about 70 to 75 percent by weight synthetic nitrile rubber, about 14 to 16 percent by weight natural rubber smoked sheet, about 7 to 8 percent by weight hydrated amorphous silica, and about 3 to 4 percent by weight of rubber processing oil.
Claim 4
Dependent Claim
120 words
An impression packer comprising a tubing section, an elongated resilient sleeve positioned over said tubing section, means connecting the ends of said sleeve in fluid-tight relationship with said tubing section to form an annular chamber between said tubing section and said sleeve, port means communicating with said annular chamber for inflating said resilient sleeve and an impression sleeve connected to said resilient sleeve for expansion and contraction therewith, said impression sleeve comprising a smooth rolled sheet containing about 70 to 75 percent by weight synthetic nitrile rubber, about 14 to 16 percent by weight natural rubber smoked sheet, about 7 to 8 percent by weight hydrated amorphous silica, and about 3 to 4 percent by weight of rubber processing oil.
Claim 5
Dependent Claim
112 words
An impression packer comprising a tubing section, an elongated resilient sleeve positioned over said tubing section, means connecting the ends of said sleeve in fluid-tight relationship with said tubing section to form an annular chamber between said tubing section and said sleeve, port means communicating with said annular chamber for inflating said resilient sleeve and an impression sleeve connected to said resilient sleeve for expansion and contraction therewith, said impression sleeve comprising a smooth rolled sheet containing about 75.0 percent by weight synthetic nitrile rubber, about 14.3 percent by weight natural rubber smoked sheet, about 7.1 percent by weight hydrated amorphous silica, and about 3.6 percent by weight of rubber processing oil.
Claim 6
Dependent Claim
112 words
An impression packer comprising a tubing section, an elongated resilient sleeve positioned over said tubing section, means connecting the ends of said sleeve in fluid-tight relationship with said tubing section to form an annular chamber between said tubing section and said sleeve, port means communicating with said annular chamber for inflating said resilient sleeve and an impression sleeve connected to said resilient sleeve for expansion and contraction therewith, said impression sleeve comprising a smooth rolled sheet containing about 75.0 percent by weight synthetic nitrile rubber, about 14.3 percent by weight natural rubber smoked sheet, about 7.1 percent by weight hydrated amorphous silica, and about 3.6 percent by weight of rubber processing oil.
References Cited (Backward Citations)
US3046601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |