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Method-and-apparatus-for-measuring-temperature-of-an-earth-formation-in-the-presence-of-a-radio-frequency-electromagnetic-field

Method and apparatus for measuring temperature of an earth formation in the presence of a radio frequency electromagnetic field

Details

Inventors: Kunetka, Robert E.; Dowling, Donald J.;
Assignee: Texaco Inc. (White Plains, NY)
Primary Examiner: Swisher; S. Clement
Assistant Examiner: Noland; Tom
Attorney, Agent or Firm: Kulason; Robert A., Ries; Carl G., Dearborn; Henry C.

A method and apparatus for measuring the temperature in a subsurface earth formation that is being heated in situ by subjection to a radio frequency electromagnetic field. It includes lowering a maximum registering thermometer into the formation on a non-conductive flexible line, and holding it there long enough to reach the ambient temperature at that location. Then, the thermometer is raised to the surface fast enough to avoid any significant change on the way up to read that registered maximum.

DETAILED DESCRIPTION Briefly, the invention concerns a method for measuring temperature of an in situ heated earth formation in the presence of a radio frequency electromagnetic field.
It comprises the steps of lowering a maximum registering thermometer into said earth formation, and holding said thermometer in said formation long enough to reach the ambient temperature.
It also comprises raising said thermometer to the surface to read said maximum registered temperature.
Again briefly, the invention concerns apparatus for monitoring electromagnetic field strength during application of high intensity radio frequency energy to a subsurface formation by measuring the temperature at predetermined locations in said formation.
It comprises in combination a maximum registering thermometer, and non-conductive flexible means for supporting said thermometer in said formation.
It also comprises means for raising said thermometer to the surface at a rate sufficient to avoid any significant change if a higher temperature is passed.
Once more briefly, the invention concerns apparatus for monitoring electromagnetic field strength during application of high intensity radio frequency energy to a subsurface formation, by measuring the temperature at predetermined locations in a borehole in said formation.
It comprises in combination a plurality of maximum registering thermometers, and non-conductive flexible line for supporting said thermometers in said borehole spaced at predetermined intervals.
It also comprises reel means for lowering and raising said thermometers in said borehole.
Each of the said thermometers comprises a highly conductive non-magnetic protective case having means for attaching said flexible line at either end thereof, and a window in said case for reading said thermometer.
Each thermometer also comprises a glass capillary maximum registering type thermometer, and a rotatable sleeve cover operatively associated with said case for closing said window when said thermometer is in said borehole

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