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    • 5. 发明授权
    • Variable frequency temperature limited heaters
    • 变频温度限制加热器
    • US07490665B2
    • 2009-02-17
    • US11112863
    • 2005-04-22
    • Chester Ledlie SandbergHarold J. VinegarChristopher Kelvin Harris
    • Chester Ledlie SandbergHarold J. VinegarChristopher Kelvin Harris
    • E21B36/04
    • E21B36/04E21B43/12E21B43/122E21B43/24E21B43/2401E21B43/2405E21B43/38H05B3/141
    • Certain embodiments provide a heating system configured to heat at least a part of a subsurface formation. The system includes an electrical power supply. A heater section includes one or more electrical conductors electrically coupled to the electrical power supply. The heater section is configured to be placed in an opening in the formation. At least one of the electrical conductors includes ferromagnetic material. The heater section provides a first heat output when time-varying electrical current is applied to the heater section below a selected temperature, and provides a second heat output approximately at and above the selected temperature during use. The second heat output is reduced compared to the first heat output. The system is configured to allow heat to transfer from the heater section to a part of the formation. The system is configured to allow a frequency of the applied time-varying electrical current to be varied.
    • 某些实施例提供了构造成加热地下地层的至少一部分的加热系统。 该系统包括电源。 加热器部分包括电耦合到电源的一个或多个电导体。 加热器部分被配置成放置在地层中的开口中。 电导体中的至少一个包括铁磁材料。 当对加热器部分施加时间变化的电流低于所选择的温度时,加热器部分提供第一热量输出,并且在使用期间提供大约等于或高于选定温度的第二热输出。 与第一热输出相比,第二热输出减少。 该系统构造成允许热量从加热器部分转移到地层的一部分。 该系统被配置为允许施加的时变电流的频率变化。
    • 6. 发明授权
    • Temperature limited heaters with relatively constant current
    • 温度限制加热器具有相对恒定的电流
    • US07481274B2
    • 2009-01-27
    • US11112878
    • 2005-04-22
    • Harold J. VinegarChester Ledlie SandbergChristopher Kelvin Harris
    • Harold J. VinegarChester Ledlie SandbergChristopher Kelvin Harris
    • E21B36/04
    • E21B36/04E21B43/12E21B43/122E21B43/24E21B43/2401E21B43/2405E21B43/38H05B3/141
    • Certain embodiments provide a system configured to heat a subsurface formation. The system includes an electrical power supply. A heater section includes one or more electrical conductors electrically coupled to the electrical power supply. At least one of the electrical conductors includes ferromagnetic material. The heater section provides a first heat output when time-varying electrical current is applied to the heater section below a selected temperature, and a second heat output approximately at and above the selected temperature during use. The second heat output is reduced compared to the first heat output. The system is configured to allow heat to transfer from the heater section to a part of the formation. The electrical power supply is configured to provide a relatively constant amount of time-varying electrical current that remains within about 15% of a selected constant current value when a load of the electrical conductors changes.
    • 某些实施例提供了一种配置成加热地下地层的系统。 该系统包括电源。 加热器部分包括电耦合到电源的一个或多个电导体。 电导体中的至少一个包括铁磁材料。 加热器部分提供当在所选择的温度下将加热器部分施加时变电流时的第一热输出,以及在使用期间大约等于或高于选定温度的第二热输出。 与第一热输出相比,第二热输出减少。 该系统构造成允许热量从加热器部分转移到地层的一部分。 电源被配置为当电导体的负载变化时,提供保持在所选定电流值的约15%内的相对恒定量的时变电流。