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Estimation of Borehole Flow Velocity from Temperature Profiles
Maria Klepikova, Tanguy Le Borgne, Olivier Bour
UMR 6118 CNRS University of Rennes 1, Rennes, France
Introduction Method Analysis Conclusions
Introduction Method Results Conclusions
1. Introduction
2. Method
3. Temperature-depth profiles as precise flowmeter measurements
4. Comparison of temperature estimated flow velocities to flowmeter
measurements
5. Estimation of fracture transmissivity, hydraulic head and connectivity
6. Conclusions
Plan
Introduction Method Results Conclusions
Temperature profiles applications
Determination of heat flow Estimation of groundwater flow
M. Reiter (2001), Using precision temperature logs to estimate horizontal and vertical groundwater flow components, Water Resour. Res,37 (3),663-674
Claude Jaupart et al. (1982) , A detailed study of the distribution of heat flow and radioactivity n New Hampshire (U.S.A.), Earth and Planetary Science Letters, 59, 267-287
Introduction Method Results Conclusions
Vertical borehole flows
Frank Börner, Susann Berthold (2009), Groundwater Geophysics.
Introduction Method Results Conclusions
Vertical borehole flows
Frank Börner, Susann Berthold (2009), Groundwater Geophysics.
Can we use temperature profiles to estimate borehole flows ?
Introduction Method Results Conclusions
Temperature profile monitoring under different flow conditions
The objective is to characterize fracture hydraulic properties and connectivity
Introduction Method Results Conclusions
Borehole scale model for flow and heat transfer
T is the temperature, is the thermal diffusivity of fluid and rock, and v is the borehole flow velocity.
v
Introduction Method Results Conclusions
The numerically obtained temperature profiles for borehole velocities varying from 0.1 mm/s to 1 cm/s, a typical range of borehole flow velocities observed in fractured formations under ambient conditions
Temperature profiles are found to be very sensitive to borehole flow velocities
V
V
Introduction Method Results Conclusions
Temperature profile – inferred velocities for different flow conditions
Measured temperature profile Inferred flow velocities
Introduction Method Results Conclusions
Temperature profile – inferred velocities for different flow conditions
Measured temperature profile Inferred flow velocities
pumping rate Q=125L/min, drawdown s=1.9m
Introduction Method Results Conclusions
Temperature profile – inferred velocities for different flow conditions
Measured temperature profile Inferred flow velocities
pumping rate Q=145L/min, drawdown s=0.6m
Introduction Method Results Conclusions
Temperature profile – inferred velocities for different flow conditions
Direct flow measurements:
Indirect from temperature measurements:
Introduction Method Results Conclusions
Estimation of the hydraulic properties from the temperature profiles
Once the single and cross-borehole temperature profiles have been
converted into flow profiles, the flow profiles can be interpreted to
infer fracture hydraulic properties.
B2-1
B2-3
B2-2
B2-4
We use the flow modelling approach proposed by Paillet
(1998).
Introduction Method Results Conclusions
Conclusions
• We have developed a methodology for characterizing spatially distributed hydraulic
properties based on temperature profile measurement under ambient, single-borehole
and cross-borehole pumping tests
V
• Vertical flow velocities deduced from the inversion of temperature profiles are
in good agreement with direct flowmeter measurements
• Temperature profiles are strongly sensitive to vertical borehole flow