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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0747592 (1985-06-24) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 322 인용 특허 : 4 |
A corrosion-resistant long heater is formed by encasing segments of metal-sheathed, mineral-insulated, electrical resistance heating elements within a metal oversheath which oversheath is substantially completely impermeable and is compressed inwardly to create metal-to-metal contacts between the sh
A corrosion-resistant long heater is formed by encasing segments of metal-sheathed, mineral-insulated, electrical resistance heating elements within a metal oversheath which oversheath is substantially completely impermeable and is compressed inwardly to create metal-to-metal contacts between the sheath and the encased elements.
A well heater comprising: a tubular metal oversheath encasing both a plurality of metal surfaced heating strands and at least one other metal surfaced strand; said metal surfaced strands being at least substantially parallel to each other and the oversheath; said oversheath being compressed radially
A well heater comprising: a tubular metal oversheath encasing both a plurality of metal surfaced heating strands and at least one other metal surfaced strand; said metal surfaced strands being at least substantially parallel to each other and the oversheath; said oversheath being compressed radially inward to establish metal-to-metal contact between it and the strands within an assembly which is spoolable and is substantally impermeable throughout its length; said heating strands including a plurality of electrically conductive cores which cores are capable of resistive heating, are surrounded by solid insulation contained within a metal sheath and are positioned and interconnected in an arrangement providing a combination of electrical resistance per unit length of the well heater such that the heater is capable of generating heat at different rates along different portions of its length; and means for supplying electric current to said heating strands.
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