| 摘要 |
The method of operating a subsurface safety valve and preventing or remediating the formations of hydrate, wax, or paraffin solids in the well bore of an oil or gas well comprising coating the external area of the intermediate portion of a string of tubing to electrically insulate said intermediate portion of said string of tubing, inserting said surface control valve into a well bore pipe on a string of tubing, electrically grounding said surface control valve to said well bore pipe, communicating an electrical signal from the surface along said string of tubing, to said surface control valve, and along said well bore pipe back to said surface, closing said surface control valve upon the interruption of said electrical signal, and using the electrical resistance of said string of tubing to heat the wall of said string of tubing.
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