US3700035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controllable in-situ combustion
Assignee: Wintershall Dea International AG
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Filing: 1970-06-04
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Granted: 1972-10-24
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Expires: 1990-06-04
Abstract
Abstract A method and device for controllable in-situ combustion in subterranean hydrocarbon bearing formations containing bitumens with simultaneous production and recovery of energy sources supplying the mechanical and thermal energy required for the insitu combustion and operation of the facilities involved.
Inventors
- 👤 Hans Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:21
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/001; E21B43/00; E21B43/16; E21B43/24; E21B43/243
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
A method according to claim 1, wherein said injection well contains two concentric tubings, comprising producing a combustion gas in a double-walled pressure resistant firebox of a steam boiler by combustion of hydrocarbons with said oxygen containing little carbon dioxide and a small amount of residual nitrogen, increasing the volume of said combustion gas by injecting water through said open system of tubes under controlled temperature conditions, introducing a major quantity of said combustion gas into the inner tubing of said injection well, cooling the smaller part of said combustion gas to condense the steam and to form a dry mixture of carbon dioxide and residual nitrogen, introducing said dry mixture into the annular space between the borehole of said well and the second larger concentric tubing, and temporarily, introducing oxygen via the annular space between the two said tubings.
Claim 2
Dependent Claim
32 words
The method of claim 1 wherein said combustion gas required for the in-situ combustion has an average composition of 94 X 5% O2, 25 X 4% N2, and 50 X 2% CO2.
Claim 3
Dependent Claim
64 words
A method according to claim 1 wherein said water in step (b) is controllably injected into the burner flames of the combustion chamber through the water injection nozzles subdivided into groups, said flames consisting of fuel and compressed oxygen or air with increasing oxygen content, forming a cooling and radiation heat absorbing body of steam around the flame thus shaping and cooling the flame.
Claim 4
Dependent Claim
51 words
A method of claim 1 wherein said water injection nozzles with and without fitted injectors are used to provide circulation of the steam and combustion gases between the combustion chamber and the annular space formed by the interior wall of the double wall and a tube-supporting wall limiting the combustion chamber.
Claim 5
Dependent Claim
59 words
A method of claim 1 wherein said water injection nozzles with and without fitted injectors are used to provide circulation of the steam and combustion gases between the combustion chamber and an annular space formed by the interior wall of a guide wall suitable for guiding the combustion gas and arranged between the double wall and the tube-supporting wall.
References Cited (Backward Citations)
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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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |