Move enkf logic

[oyvindeide]

Issue Resolves #my_issue

Approach Short description of the approach

Pre review checklist

• [ ] Added appropriate release note label
• [ ] PR title captures the intent of the changes, and is fitting for release notes.
• [ ] Commit history is consistent and clean, in line with the contribution guidelines.

Adding labels helps the maintainers when writing release notes. This is the list of release note labels.