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    • 10. 发明授权
    • Non-conducting heater casings
    • 非导热加热器外壳
    • US08448707B2
    • 2013-05-28
    • US12757650
    • 2010-04-09
    • Ronald Marshall Bass
    • Ronald Marshall Bass
    • E21B43/00
    • E21B43/243E21B36/04E21B43/2401H05B2214/03
    • A system for heating a subsurface formation includes a heater wellbore located in a subsurface formation. A single conducting heater element includes a heated portion located in a part of the subsurface formation configured to be heated and a lead-in portion located in an overburden of the subsurface formation. The heated part is located below the overburden. A heater casing is located substantially in an overburden portion of the heater wellbore. The heater casing includes an electrically non-conducting portion and an electrically conducting portion. The non-conducting portion begins at the surface of the formation. The conducting portion is located between the non-conducting portion and the heated portion of the heater. The non-conducting portion extends to a depth that is at least about 30 m above the heated portion of the heater.
    • 用于加热地下地层的系统包括位于地下地层中的加热井井筒。 单个导电加热器元件包括位于构造成被加热的地下地层的一部分中的加热部分和位于地下地层的上覆岩层中的引入部分。 加热部分位于覆盖层下方。 加热器壳体基本上位于加热器井筒的上覆层部分中。 加热器壳体包括非导电部分和导电部分。 非导电部分从地层的表面开始。 导电部分位于加热器的非导电部分和加热部分之间。 非导电部分延伸到比加热器的加热部分至少约30m的深度。