1887

Abstract

Summary

We present a thoroughly tested modeling algorithm using a Method of Moments approach to calculate the controlled-source electromagnetic response of multiple 3D pipelines or steel-cased boreholes of arbitrary geometry in a layered earth host. To validate the algorithm, we compare results with a simpler Method of Moments approach for a single vertical casing in a halfspace. We also compare results with a finite-element solution using Comsol Multiphysics for both a single vertical and single tilted well crossing a subsurface boundary. Our tests show a very good match between these different approaches. We then apply our algorithm to a realistic synthetic marine model with three casings (one vertical and two deviated) extending into a layered earth model containing the classic thin resistive layer. This example illustrates how the algorithm can be used to compute the electromagnetic response of multiple steel casings, as well as how signal can be enhanced at depth through a casing with suitable transmitter geometry.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201701352
2017-06-12
2024-03-28
Loading full text...

Full text loading...

References

  1. Commer, M., Hoversten, G.M. and Um, E.S.
    [2015] Transient-electromagnetic finite-difference time domain earth modeling over steel infrastructure: Geophysics, 80(2), E147–E162.
    [Google Scholar]
  2. Harrington, R.
    [1968] Field Computation by Moment Methods: MacMillen.
    [Google Scholar]
  3. Kohnke, C., Lavoue, F., Streich, R., Swidinsky, A.
    [2016] Calculating the effect of multiple steel cased deviated wells on electromagnetic surveys: EAGE Conference & Exhibition, Vienna, Austria, May 30–June 2, 2016.
    [Google Scholar]
  4. Swidinsky, A., Edwards, R. N. and Jegen, M.
    [2013] The marine controlled source electromagnetic response of a steel borehole casing: applications for the NEPTUNE Canada gas hydrate observatory: Geophysical Prospecting, 61, 842–856.
    [Google Scholar]
  5. Tang, W., Li, Y., Swidinsky, A. and Liu, J.
    [2015] Three-dimensional controlled-source electromagnetic modelling with a well casing as a grounded source: a hybrid method of moments and finite element scheme: Geophysical Prospecting, 63(6), 1491–1507.
    [Google Scholar]
  6. Tietze, K., C.Patzer, O.Ritter, P.Veeken, and B.Verboom
    [2016] 3D Inversion of Controlled-source Electromagnetic Data in the Presence of Steel-cased Wells: EAGE Conference & Exhibition Vienna, Austria, May 30–June 2, 2016.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201701352
Loading
/content/papers/10.3997/2214-4609.201701352
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error