 |
| Titel |
Thermal Perturbation Sensing for Monitoring Subsurface CO2 Transport |
| VerfasserIn |
J. Henninges, B. M. Freifeld, B. Norden, E. Huenges |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250029305
|
|
|
|
|
|
| Zusammenfassung |
| In the framework of the CO2SINK project, a novel thermal borehole measurement method is
being applied to enhance monitoring of brine and CO2 transport. The distributed thermal
perturbation sensor (DTPS) consists of two elements, a linear heater providing constant
heating along the axis of the wellbore, and a distributed temperature sensor (DTS), for
measuring temperatures. By creating a heat pulse and simultaneous registration of the change
in temperature along a borehole, we can draw conclusions regarding the thermal properties of
the formation and the flow processes inside the reservoir. As part of the CO2SINK
project, one injection and two observation wells were equipped with permanently
installed fiber-optic DTS cables for monitoring of borehole temperatures. Using
an additional electrical heating cable, the boreholes were heated with a power of
20 W/m for intervals of about two days, during which the borehole temperature
increased ~6 Ë C. Preliminary results from numerical inversions of the measured
heating curves prior to injection show a good correlation to the thermal conductivities
measured on core samples. As CO2 injection progresses at CO2SINK, the CO2
saturation in the formation around the injection and observation boreholes is expected to
increase, resulting in a measureable reduction in the formation’s thermal conductivity. |
|
|
|
|
|
|