4. Wells
  5. With heating, refrigerating or heat insulating means
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Lift gas heat exchanger

Wells – With heating – refrigerating or heat insulating means – Heater surrounding production tube
Patent

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Low flux leakage cables and cable terminations for A.C. electric

Wells – With heating – refrigerating or heat insulating means – Electrical heater in well
Patent

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Low pressure combustor for generating steam downhole

Wells – With heating – refrigerating or heat insulating means – Burner in well
Patent

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