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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0170578 (1993-12-20) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 313 인용 특허 : 0 |
A method for heat injection into a subterranean formation is provided. The method utilizes flameless combustion and a gas fired heater having an electrical heated surface for ignition of the gas. The absence of a flame eliminates the flame as a radiant heat source and results in a more even temperat
A method for heat injection into a subterranean formation is provided. The method utilizes flameless combustion and a gas fired heater having an electrical heated surface for ignition of the gas. The absence of a flame eliminates the flame as a radiant heat source and results in a more even temperature distribution throughout the length of the burner. Flameless combustion is accomplished by preheating the fuel and the combustion air to a temperature above the autoignition temperature of the mixture. Preheating hydrocarbon fuel requires the inclusion of a carbon formation suppressant such as carbon dioxide or steam to prevent carbon formation.
A method for heating a subterranean formation, the method comprising: passing a fuel gas through a fuel gas conduit to a mixing point juxtaposed to the subterranean formation; passing a combustion air stream through a combustion air conduit to the mixing point; combining the fuel gas and the combust
A method for heating a subterranean formation, the method comprising: passing a fuel gas through a fuel gas conduit to a mixing point juxtaposed to the subterranean formation; passing a combustion air stream through a combustion air conduit to the mixing point; combining the fuel gas and the combustion air at the mixing point; providing a return conduit from the mixing point to the surface; heating an electrically heated surface within the borehole downstream of the mixing point wherein the electrically heated surface is heated to a temperature above the autoignition temperature of the mixture of the fuel gas and the combustion air thereby causing at least a portion of the combined fuel gas and combustion air to react, creating combustion gas stream and releasing heat of reaction; transferring a portion of the heat of reaction to the subterranean formation; transferring another portion of the heat from the combustion gas stream to the fuel gas, the combustion air stream or both; and passing the combustion gas stream through the return conduit to the surface wherein the electrically heated surface is electrically heated during a time when the heat transferred from the combustion gas stream to the fuel gas, the combustion air stream or both is an insufficient quantity to heat the fuel gas, the combustion air or both such that the combined fuel gas and combustion air stream is at a temperature above the autoignition temperature of the combined fuel gas; and the combustion air stream and the electrically heated surface is not supplied with power during a time period when heat is transferred from the combustion gas stream to the fuel gas, the combustion air stream or both in a sufficient quantity to heat the fuel gas, the combustion air or both to the extent that the combined fuel gas and combustion air stream is at a temperature above the autoignition temperature of the combined fuel gas and combustion air stream. A heater for heating a subterranean formation, the heater comprising: a fuel gas conduit through which fuel gas may be conducted from the surface to a mixing point within the formation to be heated; a combustion air conduit through which combustion air can be conducted from the surface to the mixing point; a return conduit through which gas can be conducted from the mixing point to the surface; a means to conduct heat from the return conduit to the combustion air conduit, the fuel gas conduit or both; a heater casing capable of conducting heat from the return conduit to the formation; and an electrical heater in the return conduit, the electrical heater being capable of providing a heated surface temperature above the autoignition temperature of a fuel gas and combustion air mixture.
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