coring

[Franc2009]

The question is : weighting the importance to run conventional coring vs sidewall coring. OBM and WBM.
I repute that the SWC in OBM are still a good choice and surely less expensive buit of course need to see also the well setion if Hz or Vert. What are your thought on weichting this decision?

[mid]

I go always with conventional coring, as such core will benefit all disciplines and will have the opportunity to get the required tests and get some preserved for future use, while SWC is not successful all the times, and mostly gives small plugs and not suitable for SCAL tests
if no conventional core is possible then SWC might give an idea of the reservoir properties

[panaroL]

I second mid on this. Conventional core is always the best choice for data acquisition; given that you have made strong justification to spend certain amount of money. SWC may or may not be successful during their coring (tool problem, retrieval problem, etc), and it's usefulness for tests is limited (eg poro and perm values could be distorted etc). However SWC is cheaper, and does have one BIG plus point - you're able to easily take sample points throughout your hole (if you require).

[Franc2009]

You are both right but in fact if u use rorary sidewall coring you can avoid the distorsions and other negative effects. Certainly a conventional coring must be justified by a full set of data required as a goal.

[mid]

NOt reallr Franc2009, i would not advice using SWC at all unless there is no conventional core