Is it possible to practise Zhineng Qigong without qi field?

Yes, not every instructor can organize a qi field.

You can learn the Zhineng Qigong form in this way.

The connection of all participants within the qi field is then missing.Nevertheless the effect of qi may be there.

With a good teacher the qi field is an entirety.

The qi of all participants with the teacher is in the qi field.

Thus the full effect of Zhineng Qigong unfolds.