US3855856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 natural rubber smoked sheet, silica powder and rubber processing oil.
Inventors
- 👤 S Hutchison
- 👤 G Anderson
- 👤 G Newby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:32
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/1208; E21B33/127; E21B33/1277; E21B47/00; E21B47/09; E21B47/098
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 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 BETWEEN 50 PERCENT BY WEIGHT AND 70 PERCENT BY WEIGHT NATURAL SMOKED SHEET RUBBER, BETWEEN 10 PERCENT BY WEIGHT AND 30 PERCENT BY EIGHT HYDRATED AMORPHOUS SILICA TO IMPART A SMOOTH FINISH ON SAID SHEET AND BETWEEN 3 PERCENT BY WEIGHT AND 15 PERCENT BY WEIGHT OF RUBBER PROCESSING OIL.
Claim 2
Dependent Claim
127 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 BETWEEN 50 PERCENT BY WEIGHT AND 70 PERCENT BY WEIGHT NATURAL SMOKED SHEET RUBBER, BETWEEN 10 PERCENT BY WEIGHT AND 30 PERCENT BY EIGHT HYDRATED AMORPHOUS SILICA TO IMPART A SMOOTH FINISH ON SAID SHEET AND BETWEEN 3 PERCENT BY WEIGHT AND 15 PERCENT BY WEIGHT OF RUBBER PROCESSING OIL.
Claim 3
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 57.2 percent by weight natural smoked sheet rubber, about 28.4 percent by weight hydrated amorphous silica to impart a smooth finish on said sheet and about 14.4 percent by weight of rubber processing oil.
Claim 4
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 57.2 percent by weight natural smoked sheet rubber, about 28.4 percent by weight hydrated amorphous silica to impart a smooth finish on said sheet and about 14.4 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 |