US3572838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of aluminum compounds and oil from oil shale formations
Assignee: Shell USA Inc
•
Filing: 1969-07-07
•
Granted: 1971-03-30
•
Expires: 1989-07-07
Abstract
Abstract An improved, new and novel method of recovery of oil and aluminum-containing compounds from subterranean oil shale formations, by treating such formations with alternating slugs of a pyrolytically extractive fluid and an aqueous alkaline fluid containing an acid-insoluble chelating agent and recovering oil and aluminum compounds from said extractive fluids.
Inventors
- 👤 Charles C Templeton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:03
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/243; E21B43/247; E21B43/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
In a method of producing shale oil and soluble aluminum compounds from subterranean dawsonite-containing oil shale formations comprising the steps of: a. creating a fractured or rubblized or fragmented oil shale formation or cavity; b. flowing into the formation or a cavity pyrolytically extractive fluid; c. flowing into the formation or cavity an aqueous liquid containing a chelating agent in an amount sufficient to dissolve soluble aluminum compounds; d. outflowing the liquids produced by steps (a) and (b); e. separating the aqueous phase from the oil phase and, f. recovering an aluminum compound from the aqueous phase.
Claim 2
Dependent Claim
97 words
In a method of producing shale oil and soluble aluminum compounds from subterranean dawsonite-containing oil shale formations comprising the steps of: a. creating a fractured or rubblized or fragmented oil shale formation or cavity; b. flowing into the formation or a cavity pyrolytically extractive fluid; c. flowing into the formation or cavity an aqueous liquid containing a chelating agent in an amount sufficient to dissolve soluble aluminum compounds; d. outflowing the liquids produced by steps (a) and (b); e. separating the aqueous phase from the oil phase and, f. recovering an aluminum compound from the aqueous phase.
Claim 3
Dependent Claim
42 words
The method of claim 1 wherein the in situ combustion for oil recovery and aqueous liquid dissolution of the dawsonite is sequentially repeated and the aqueous liquid is an aqueous alkaline liquid containing a sodium salt of a alkylene polyamine polycarboxylic acid.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the aluminum compound is recovered from dissolved dawsonite.
Claim 5
Dependent Claim
46 words
The method of claim 3 wherein the oil shale is pyrolyzed by injecting therein an in situ combustible material at an elevated temperature sufficient to effect oil extraction and the chelating agent in the aqueous fluid is an alkali metal salt of an amino carboxylic acid.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein the aqueous alkaline liquid is an aqueous alkaline solution containing tetra sodium ethylene diamine tetracetate.
Claim 7
Dependent Claim
40 words
The method of claim 4 wherein the fluid is recovered by combustion treatment is shale oil and the aqueous liquid containing a chelating agent used to dissolve the dawsonite is an aqueous alkaline liquid containing an acid insoluble chelating agent.
Claim 8
Dependent Claim
19 words
The method of claim 6 wherein the combustion mixture is maintained as a foamed mixture of air and water.
References Cited (Backward Citations)
US3502372A
Cited
US3501201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |