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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0832267 (1986-02-21) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 347 인용 특허 : 4 |
A thermally-enhanced oil recovery method and apparatus for exploiting deep well reservoirs utilizes electric downhole steam generators to provide supplemental heat to generate high quality steam from hot pressurized water which is heated at the surface. A downhole electric heater placed within a wel
A thermally-enhanced oil recovery method and apparatus for exploiting deep well reservoirs utilizes electric downhole steam generators to provide supplemental heat to generate high quality steam from hot pressurized water which is heated at the surface. A downhole electric heater placed within a well bore for local heating of the pressurized liquid water into steam is powered by electricity from the above-ground gas turbine-driven electric generators fueled by any clean fuel such as natural gas, distillate or some crude oils, or may come from the field being stimulated. Heat recovered from the turbine exhaust is used to provide the hot pressurized water. Electrical power may be cogenerated and sold to an electric utility to provide immediate cash flow and improved economics. During the cogeneration period (no electrical power to some or all of the downhole units), the oil field can continue to be stimulated by injecting hot pressurized water, which will flash into lower quality steam at reservoir conditions. The heater includes electrical heating elements supplied with three-phase alternating current or direct current. The injection fluid flows through the heater elements to generate high quality steam to exit at the bottom of the heater assembly into the reservoir. The injection tube is closed at the bottom and has radial orifices for expanding the injection fluid to reservoir pressure.
A method of stimulating the flow of oil from a reservoir formation traversed by a bore hole, comprising providing an above-ground hydrocarbon powered turbinedriven electric generator to produce electrical power, supplying water in heat exchange relation to the exhaust from said turbine to produce pr
A method of stimulating the flow of oil from a reservoir formation traversed by a bore hole, comprising providing an above-ground hydrocarbon powered turbinedriven electric generator to produce electrical power, supplying water in heat exchange relation to the exhaust from said turbine to produce pressurized hot water simultaneously with said power generation, positioning electric heating means in said bore hole between the surface and the point of discharge to said formation and energizing the same by power from said generator, positioning an injection tube in said bore hole adjacent to said heating means, said electric heating means comprising a plurality of electric resistance heaters, completely insulated electrically from injected water and formation fluids positioned circumferentially about said hot water injection tube, said injection tube comprising a small-diameter insulated tube enclosed at the bottom and having orifices in the side wall adjacent to said electric heating means, injecting said pressurized hot water from the surface down the bore hole through said injection tube to expand said water to reservoir pressure, while maintaining a high hydrostatic pressure thereon, and in heat exchange with said electric resistance heaters to convert said water into high pressure steam, said electric resistance heaters being the sole source of heat for vaporizing said pressurized hot water, and directing said high pressure steam from said electric resistance heaters into said oil reservoir to heat the same and stimulate the flow of hydrocarbons therefrom. An injection-heater for injecting high-pressure steam into a well formation comprising an elongated axially extending tubular member adapted to be secured on the lower end of a conduit supported in a well bore, said tubular member being enclosed at its bottom end and having a series of apertures in its side wall adjacent thereto, heating means comprising a plurality of elongated electric heating elements circumferentially disposed about said tubular member bottom end adjacent to said apertures, said electric heating means comprising a plurality of electric resistance heaters, completely insulated electrically from injected water and formation fluids positioned circumferentially about said tubular member, (said tubular member being adapted to receive water conducted from the surface through said conduit and to expand said water to well formation pressure and inject same into contact with said heating means to convert the water into high pressure steam, and) said tubular member being adjacent to said electric resistance heaters and adapted to receive water conducted from the surface through said conduit and to expand said water to reservoir pressure and inject same into contact with said electric resistance heaters to convert the water into high pressure steam, said electric resistance heaters being the sole source of heat for vaporizing said pressurized hot water, and means to direct said high pressure steam from said (heating means) electric resistance heaters into said well formation to heat the same to stimulate the flow of hydrocarbons therefrom.
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