WISE-CASING: DC Simulation at Containment and Monitoring Institute (CaMI), Calgary, Canada

Description

For the model calculation we applied EM3D using completion diagram of CaMI site and a background resistivity consistent with the borehole logs. It was also important to use the accurate position of the return electrode. We note that for the data fit the code also incorporated well casings for well INJ and the other observation well, either OB1 or OB2, in the calculation. In summary, we demonstrate here, for this particular case, that the DC results may be a reasonable approximation to the low frequency EM data collected at CaMI. If this approximation continues to hold, then the extreme computational efficiency offered by the hierarchical modeling used in the DC simulations will permit us to explore far more model complexity, especially the pervasive and troublesome data artifacts that arise when doing EM surveys in mature, culturally developed sites. In Brief, both the low frequency and DC simulation codes provided very consistent results that match the field data really well, indicating their capability to help monitoring borehole integrity with the low frequency EM method.

Resources

Name Format Description Link
10 Document summarizing the model calculation, the comparison of field data to forward-modeled data, and preliminary conclusions. Includes plots of total potential (V) versus position (m) and plots of electrostatic field (V/m) versus position (m). https://gdr.openei.org/files/1171/CaMI_report.docx
34 Measured low frequency versus DC simulation total field (V/m) data for excitation of OBS1 and OBS2 with respect to the injection well. https://gdr.openei.org/files/1171/cami_top_casing_5hz_interpretation.PNG
47 Field low frequency EM data for excitation of Observation Well 2 using a 5 Hz source frequency. Data is provided as distance form wellhead (m), Ex field amplitude (V/m), and Ex phase (degrees).. https://gdr.openei.org/files/1171/field_data_obs2_excited_5hz.txt
47 DC simulation data for excitation of Observation Well 2 using a 5 Hz source frequency. Data is provided as distance form wellhead (m) and Ex field amplitude (V/m). https://gdr.openei.org/files/1171/numerical_data_obs2_excited_5hz.txt
47 DC simulation data for excitation of Observation Well 1 using a 5 Hz source frequency. Data is provided as distance form wellhead (m) and Ex field amplitude (V/m). https://gdr.openei.org/files/1171/numerical_data_obs1_excited_5hz.txt
34 Oblique view diagram showing locations of OBS1, OBS2, INJ, the receiver profile, and the return electrode. https://gdr.openei.org/files/1171/cami_top_casing_source_configuration.PNG
47 Field low frequency EM data for excitation of Observation Well 1 using a 5 Hz source frequency. Data is provided as distance form wellhead (m),Ex field amplitude (V/m), and Ex phase (degrees). https://gdr.openei.org/files/1171/field_data_obs1_excited_5hz.txt

Tags

  • potential-field
  • data
  • low-frequency-em-method
  • geophysics
  • experiment
  • modeling
  • field
  • canada
  • borehole-logs
  • hierarchical-modeling
  • casing
  • wise-casing
  • cmc
  • corrosion
  • validation
  • numerical
  • containment-and-monitoring-institute
  • wellbore
  • field-data
  • borehole
  • forward
  • excitation
  • well
  • 5-hz
  • em3d
  • electrostatic-rsponse
  • integrity
  • fem
  • em
  • dc-model
  • electric-field
  • modelling
  • frequency-domain
  • electric-fields
  • simulated
  • fdem
  • simulation
  • low-frequency
  • electromagnetic
  • geothermal
  • sandia
  • cami
  • energy

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