SIMPLE METHOD FOR DETECTING ANOMALOUS FLUID MOTIONS IN BOREHOLES FROM CONTINUOUS TEMPERATURE LOGS.
By: William H. Diment and Thomas C. Urban
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Abstract
Above a critical Rayleigh number, the fluid in a borehole convects. The aspect ratio of the convective motions is commonly between four and ten as determined by temperature-time recordings at fixed depths in cased holes. Aspect ratios greatly in excess of this range indicate anomalous fluid-flow in the hole such as might be caused by exchange of fluid among aquifers. Such high-aspect ratios can be detected from a single continuous temperature-depth log by taking the difference between the temperature gradient over a short interval and that over a longer spanning interval and dividing this difference by the gradient over the longer interval. This provides a measure of the gradient error (GE) from which an aspect ratio (AR) can be calculated. GEAR logs are presented for a large and a small diameter hole and for a large-diameter partially cased hole containing a small-diameter tubing. Refs.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | SIMPLE METHOD FOR DETECTING ANOMALOUS FLUID MOTIONS IN BOREHOLES FROM CONTINUOUS TEMPERATURE LOGS. |
| ISBN | 093441257X |
| Volume | 7 |
| Year Published | 1983 |
| Language | English |
| Publisher | Geothermal Resources Council |
| Publisher location | Davis, CA, USA |
| Larger Work Title | Transactions - Geothermal Resources Council |
| First page | 485 |
| Last page | 490 |
| Conference Title | Geothermal Resources: Energy on Tap! Geothermal Resources Council 1983 Annual Meeting. |
| Conference Location | Portland, OR, USA |
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