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Patent US3751226A successfully refreshed from Google Patents.
US3751226A
Expired / Lapsed
US
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Backflow test for oil concentration
Assignee: SHELL HOUSTON
•
Filing: 1971-10-13
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Granted: 1973-08-07
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Expires: 1991-10-13
Abstract
Abstract The concentration of oil phase fluid in subterranean reservoir is measured by injecting slugs of aqueous liquid containing a preferentially water soluble tracer (i.e., distinctive material) that reacts within the reservoir to form a tracer material that is relatively oil soluble and is partitioned between the oil and water phase fluids.
Inventors
- 👤 R Hesse
- 👤 R Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
E; E21; E21B; E21B49/00; E21B47/00; E21B47/10; E21B47/11; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/200833
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
The process of claim 1 in which said tracer containing aqueous fluid is injected in the form of a series of slugs that alternate with slugs of aqueous fluid free of the tracer material.
Claim 2
Dependent Claim
15 words
The process of claim 1 in which said hydrolyzable tracer material is a beta-keto ester.
Claim 3
Dependent Claim
25 words
The process of claim 1 in which said aqueous fluid contains additional substantially exclusively water soluble tracer material which is substantially inert within the reservoir.
Claim 4
Dependent Claim
25 words
The process of claim 4 in which said hydrolyzable tracer material is a beta-keto ester and said substantially exclusively water soluble tracer material is tritium.
References Cited (Backward Citations)
US3590923A
Cited
US3623842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |