scholarly journals Temperature dependence of the thermal conductivity of core samples from a test well at Onikobe geothermal area and in situ conduction heat flow.

1985 ◽  
Vol 50 (4) ◽  
pp. 228-238
Author(s):  
Hiroshi KIYOHASHI ◽  
Munesuke KYO ◽  
Mamoru YAMADA ◽  
Shozo TANAKA
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Temperature Dependence ◽  
Geothermal Area ◽  
Core Samples ◽  
Conduction Heat Flow

An Analysis of a Method of In-Situ Thermal Properties Determination for Geologic Formations

1985 ◽  
Vol 107 (1) ◽  
pp. 122-127
Author(s):  
J. D. Lin ◽  
T. J. Love
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Moisture Content ◽  
Oil Recovery ◽  
Thermal Methods ◽  
Core Samples ◽  
Time Required ◽  
And Storage ◽  
Flux Probe

Geothermal investigations and thermal methods of oil recovery require the thermal properties of rock be known. The thermal conductivity of rock is normally determined by measuring the properties of core samples which have been removed from the well. The major problem with this is the fact that thermal properties are dependent on the moisture content of the rock. This moisture content is very likely altered in transportation and storage. This paper presents an analysis which serves as the basis of a transient heat flux probe measurement that may be used to determine the thermal conductivity and diffusivity in situ. Such in-situ measurements would overcome the disadvantages of core samples and may also be used when core samples are not available. This analysis also provides a method of estimating the time required in order to obtain valid results. The analysis indicates rather long test times may be required for accurate results. However, it does provide a basis for evaluating the results of measurements taken for shorter times. The effects of contact thermal resistance between the probe, the well casing, and the formation are evaluated.

Modelling of Thermal Rectification in Si and Ge Thin Films

2013 ◽  
Author(s):  
E. Chávez-Ángel ◽  
C. M. Sotomayor Torres ◽  
F. Alzina
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Heat Flow ◽  
Temperature Dependence ◽  
Cross Section ◽  
Impurity Concentration ◽  
Boundary Scattering ◽  
Bulk Materials ◽  
Thermal Rectification ◽  
Scattering Effects

In the present work we have studied an extension of the classical thermal rectification, arising in certain cases from the contact of two dissimilar bulk materials with different temperature dependence of the thermal conductivity, to the Si-Ge system when boundary scattering effects are taken into account. Moreover, the directionality of the in-plane heat flow in a Si plate can be achieved by tuning the thickness and the impurity concentration along the cross section of the plate. We have designed several potential structures with this function in mind and discussed the physics behind.

METHOD FOR DETERMINING TERRESTRIAL HEAT FLOW IN OIL FIELDS

Geophysics ◽  
1977 ◽  
Vol 42 (3) ◽  
pp. 584-593 ◽  
Author(s):  
Humberto Da Silva Carvalho ◽  
Victor Vacquier
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Sedimentary Basins ◽  
Oil Fields ◽  
Inexpensive Method ◽  
Average Heat ◽  
Core Samples ◽  
Bottom Hole ◽  
Terrestrial Heat Flow ◽  
The World

A method of determining terrestrial heat flow in oil fields from bottom‐hole temperatures, electric logs, and thermal conductivity of core samples has been tried in six Reco⁁ncavo Basin oil fields in Brazil. The average heat‐flow value so determined for the Reco⁁ncavo Basin is [Formula: see text]. The technique can be used for calculating heat flow in continental areas elsewhere. A more significant outcome of our experiment is that it demonstrates an inexpensive method of obtaining terrestrial heat‐flow values in the sedimentary basins of the world.

Cylindrical probe with a variable heat flow rate: A new method for the determination of formation thermal conductivity

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Lev Eppelbaum ◽  
Izzy Kutasov
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Flow Rate ◽  
Dry Density ◽  
Heat Flow Rate ◽  
Cylindrical Probe ◽  
Variable Heat ◽  
Variable Heat Flow

AbstractThe thermal conductivity of a geological formation is one of the important petrophysical parameters which are preferable to study in situ in geophysical well logs. A new technique for the determination of formation thermal conductivity has been developed. We assumed that formation dry density, porosity, and pore fluids saturations could be determined from core samples or cuttings. In this case the specific heat and density of a formation can be quantitatively estimated. It is also assumed that the instantaneous heat flow rate and time data are available for a cylindrical probe with a variable heat flow rate placed in a wellbore. A semi-theoretical equation describing the temperature of the probe’s wall is used to determine in situ the formation conductivity as a function of the temperature increase. The formation thermal diffusivity is also calculated. A field example is presented.

The Mid-Atlantic Ridge Near 45° N. XV. Thermal Conductivity of Dredge and Drill Core Samples

1971 ◽  
Vol 8 (3) ◽  
pp. 391-393 ◽  
Author(s):  
R. D. Hyndman ◽  
A. M. Jessop
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Drill Core ◽  
Core Samples ◽  
Mid Atlantic Ridge ◽  
Thermal Conductivities

Thermal conductivities have been measured on dredge samples and drill core from the Mid-Atlantic Ridge near 45° N. On the basis of these measurements and published heat flow values, crustal temperatures near the ridge are estimated.

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