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Title: Convective heat flow probe

A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansionmore » mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
6132297
DOE Contract Number:
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; HEAT FLOW; MEASURING INSTRUMENTS; PROBES; BOREHOLES; CONVECTION; DESIGN; HEATERS; MONITORING; TEMPERATURE MEASUREMENT; CAVITIES; ENERGY TRANSFER; HEAT TRANSFER; MASS TRANSFER 150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys