THERMAL REGIME OF A LARGE DIAMETER BOREHOLE: INSTABILITY OF THE WATER COLUMN AND COMPARISON OF AIR‐ AND WATER‐FILLED CONDITIONS

Autor:	William H. Diment
Rok vydání:	1967
Předmět:	Materials science Water injection (oil production) Borehole Mechanics Dissipation Instability Degree (temperature) Geophysics Water column Geochemistry and Petrology Thermal Geotechnical engineering Geothermal gradient Physics::Atmospheric and Oceanic Physics
Zdroj:	GEOPHYSICS. 32:720-726
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.1439885
Popis:	Temperatures were measured as a function time and depth in a borehole before and after it had been filled with water. The hole is 25 cm in diameter, 340 m deep, and effectively sealed from influx of ground water. The measurements reveal that: (1) Temperature differences between the air‐filled hole and the water‐filled hole (after dissipation of the water injection disturbance) do not exceed 0.05°C at the same depth. (2) Temperatures in the water‐filled hole exhibit oscillations at all depths where temperature increases downward but are stable at the bottom and near the surface where temperature decreases with depth. (3) The temperature oscillations have periods ranging from several minutes to several hours. (4) The amplitudes of the oscillations are several hundredths of a degree, and are roughly proportional to the geothermal gradient near the point of measurement, thus suggesting that the size of cells or eddies are rather constant and that the distance of water movement is no more than several times the inner diameter of the casing. (5) No oscillations were detected in the air‐filled hole, but because the time constants of the instrument are long in an air‐filled hole, the possibility of short period oscillations cannot be excluded.
Databáze:	OpenAIRE
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