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다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0646514 (1991-01-25) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 302 인용 특허 : 0 |
Electrical power sources and systems for heating in or adjacent to an oil well or other mineral well, or for heating other earth media, each comprising an A.C. heating generator that generates an A.C. heating current at a selected heating frequency substantially different from the conventional 50/60
Electrical power sources and systems for heating in or adjacent to an oil well or other mineral well, or for heating other earth media, each comprising an A.C. heating generator that generates an A.C. heating current at a selected heating frequency substantially different from the conventional 50/60 Hz frequency used by power companies; the heating generator may comprise an A.C. to D.C. converter for developing an intermediate D.C. output of predetermined amplitude from a conventional 50/60 Hz A.C. input, and a solid state switching circuit for repetitively sampling the D.C. output of the converter at the selected heating frequency, usually in a range of 0.01 Hz (or even lower) up to about 35 Hz. A heating rate control varies the energy content and the frequency of the A.C. output to suit well requirements. Each power source or system includes output connections for connecting the output of the heating generator to a normally inaccessible main heating electrode, usually located downhole in a well, and to a return electrode; most have the capability of including a very small controllable D.C. component in the output.
An electrical heating power source for a heating system for heating a zone in a subterranean formation, the heating system including the power source, a main electrode positioned in the zone to be heated, at least one sensor in the well for sensing a parameter relating to fluid pressure, fluid tempe
An electrical heating power source for a heating system for heating a zone in a subterranean formation, the heating system including the power source, a main electrode positioned in the zone to be heated, at least one sensor in the well for sensing a parameter relating to fluid pressure, fluid temperature, fluid level, fluid flow rate, or fluid constituency in the well or in the deposit, and a return electrode, the power source comprising: A.C. heating current generator means for generating a high amplitude A.C. heating current, of at least fifty amperes, at a heating frequency in a range of 0.01 Hz to 35 Hz; the A.C. heating current generator means including A.C. to D.C. conversion means for developing an intermediate D.C. output of predetermined amplitude from a conventional 50/60 Hz power input, input connection means for connecting the power source to a 50/60 Hz supply, an input transformer coupling the input connection means to the conversion means, and switching means, connected to the conversion means, for repetitively sampling the intermediate D.C. output of the conversion means at the heating frequency to develop the high amplitude A.C. heating current at the heating frequency, the conversion means and the switching means being combined in one circuit comprising a plurality of gated rectifiers; heating control means, connected to the heating current generator means and having an input derived from the sensor, for controlling the heating frequency and the energy content of the A.C. heating current in accordance with changes in said parameter, the heating control means including at least one tapped winding on the input transformer and comprising means for varying the relative duty cycles of the gated rectifiers by applying a predetermined sequence of gate signals to the gated rectifiers at the heating frequency; and output connection means for connecting the A.C. heating current to the electrodes.
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