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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0828904 (1977-08-29) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 383 인용 특허 : 1 |
The disclosure describes a technique for uniform heating of relatively large blocks of hydrocarbonaceous formations in situ using radio frequency (RF) electrical energy that is substantially confined to the volume to be heated and effects dielectric heating of the formations. An important aspect of
The disclosure describes a technique for uniform heating of relatively large blocks of hydrocarbonaceous formations in situ using radio frequency (RF) electrical energy that is substantially confined to the volume to be heated and effects dielectric heating of the formations. An important aspect of the disclosure relates to the fact that certain hydrocarbonaceous earth formations, for example raw unheated oil shale, exhibit dielectric absorption characteristics in the radio frequency range. In accordance with the system of the invention, a plurality of conductors are inserted in the formations and bound a particular volume of the formations. The phrase “bounding a particular volume”is intended to mean that the volume is enclosed on at least two sides thereof. Electrical excitation is provided for establishing alternating electric fields in the volume. The frequency of the excitation is selected as a function of the dimensions of the volume so as to establish a substantially non-radiating electric field which is substantially confined in the volume. In this manner, volumetric dielectric heating of the formations will occur to effect approximately uniform controlled heating of the volume.
A method for in situ extraction of valuable constituents from an oil shale bed, comprising the steps of: drilling a plurality of boreholes which bound a particular volume of said shale; inserted electrical conductors into said boreholes; introducing electrical excitation to said shale bed to establi
A method for in situ extraction of valuable constituents from an oil shale bed, comprising the steps of: drilling a plurality of boreholes which bound a particular volume of said shale; inserted electrical conductors into said boreholes; introducing electrical excitation to said shale bed to establish alternating electric fields in said volume, the frequency of said excitation being selected as a function of the volume dimensions so as to establish substantially non-radiating electric fields which are substantially confined in said volume so that volumetric dielectric heating of said shale bed will occur to effect approximately uniform heating of said volume; continuing said electrical excitation to effect heating of said volume to a temperature sufficient to cause the volatilization of moisture therein and resulting porosity and permeability in said volume; and withdrawing valuable constituents from said volume.
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