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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0597764 (1984-04-06) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 345 인용 특허 : 1 |
Long intervals of subterranean earth formations are heated at high temperatures for long times with an electrical heater containing spoolable, steel sheathed, mineral insulated cables which have high electrical conductivities, enabling them to heat the earth formations at a substantially uniform rat
Long intervals of subterranean earth formations are heated at high temperatures for long times with an electrical heater containing spoolable, steel sheathed, mineral insulated cables which have high electrical conductivities, enabling them to heat the earth formations at a substantially uniform rate of more than about 100 watts per foot at temperatures between about 600°and 1000°C., with a pattern of localized electrical resistances which are correlated with the heat conductivities of the earth formations and the heat stabilities of materials providing power and support for the heater.
A process for heating a significantly long interval of subterranean earth formations, comprising: constructing at least one electrical heating cable consisting essentially of (a) an electrically conductive central core having a relatively low electrical resistance, (b) an insulation around said core
A process for heating a significantly long interval of subterranean earth formations, comprising: constructing at least one electrical heating cable consisting essentially of (a) an electrically conductive central core having a relatively low electrical resistance, (b) an insulation around said core comprising a compressed mass of solid particles of electrically nonconductive, heat-stable material, and (c) a metal sheath around said core and insulation having significant softening resistance and tensile strength; arranging at least one of said heating cables to provide a heater capable of (a) being extended throughout the interval to be heated, and (b) generating selected temperatures between about 600°to 1000°C. in response to a voltage which is less than the sparking potential of the insulation between the core and sheath; arranging a pattern with distance along said heater of combinations of heating cable core cross-sectional areas and heating cable core resistances which pattern is correlated with the pattern of heat conductivity with distance which exists along said interval of earth formations to be heated, so that localized increases and decreases in the average electrical resistance with distance along the heater have magnitude and relative positions similar to those of localized increases and decreases in the heat conductivity in the adjacent earth formations in a manner capable of resulting in a substantially uniform rate of heat injection into the earth formations; positioning said heater within the borehole of a well so that the heater is both located along the interval of earth formations to be heated and isolated from contact with fluid flowing into or out of the earth formations to be heated; and operating the heater by applying a voltage sufficient to generate temperatures of about 600°to 1000°C. along the heater to effect said substantially uniform rate of heat injection.
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