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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0600526 (1996-02-13) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 281 인용 특허 : 0 |
A control for an electrical heating system that enhances production from an oil well, particularly a horizontal oil well; the well includes an initial well bore extending downwardly from the surface of the earth through one or more overburden formations and into communication with a producing well b
A control for an electrical heating system that enhances production from an oil well, particularly a horizontal oil well; the well includes an initial well bore extending downwardly from the surface of the earth through one or more overburden formations and into communication with a producing well bore that extends or deviates outwardly from the initial well bore into an oil producing formation. The heating system includes an array of short, electrically conductive heating electrodes extending longitudinally through the producing well bore. The heating system further includes apparatus for electrically energizing electrodes that are close to each other with A.C. power; the A.C. power supplied to electrodes near each other has a phase displacement of at least 90.degree., usually 120.degree. or 180.degree., between electrodes. The control Includes plural power switches, each connected to at least one heating electrode; each power switch is conductive only up to a predetermined limit (usually a temperature limit). In one embodiment, each power switch includes a sensor responsive to the operating condition of its heating electrode. Another embodiment employs a telemeter circuit to actuate the power switches with sensors that are separate from the power switches.
[ I claim:] [1.] An electrical control for an iterated heating electrode array for an oil well, the oil well comprising an initial well bore extending downwardly from the surface of the earth through overburden formations and a producing well bore in communication with and extending from the initial
[ I claim:] [1.] An electrical control for an iterated heating electrode array for an oil well, the oil well comprising an initial well bore extending downwardly from the surface of the earth through overburden formations and a producing well bore in communication with and extending from the initial well bore into an oil producing formation, the electrode array including sets of two or more electrically isolated conductive heating electrodes spaced longitudinally through the producing well bore, and a plural-conductor energizing cable for electrically energizing the heating electrodes in each set of electrodes with A.C. power at a phase displacement of at least 90.degree., the electrical control comprising:a plurality of sensor switches, each sensor switch being connected from the energizing cable to one heating electrode, each sensor switch being actuated only for a predetermined sensing range and being unactuated above that range.
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