发明名称 |
Temperature limited heaters with thermally conductive fluid used to heat subsurface formations |
摘要 |
Certain embodiments provide a system including a heater. The heater includes one or more electrical conductors. The heater is configured to generate a heat output during application of electrical current to the heater. The heater includes a ferromagnetic material. A conduit at least partially surrounds the heater. A fluid is located in a space between the heater and the conduit. The fluid has a higher thermal conductivity than air at standard temperature and pressure (STP) (0° C. and 101.325 kPa). The system is configured to provide (a) a first heat output below a selected temperature when time-varying electrical current is applied to the heater, and (b) a second heat output near or above the selected temperature when time-varying electrical current is applied to the heater.
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申请公布号 |
US7383877(B2) |
申请公布日期 |
2008.06.10 |
申请号 |
US20050112714 |
申请日期 |
2005.04.22 |
申请人 |
SHELL OIL COMPANY |
发明人 |
VINEGAR HAROLD J.;HARRIS CHRISTOPHER KELVIN |
分类号 |
E21B43/00;E21B29/00;E21B36/04;E21B43/12;E21B43/24;E21B43/30;E21B43/38;H05B3/10;H05B3/14;H05B6/10 |
主分类号 |
E21B43/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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