I noticed that strikes seem to bee primarily on storage facilities. These are easier and cheaper to rebuild than the actual refining aspects of the refinery, but will bring production to a standstill and eliminate existing stocks.
It is the least (long term) painful way to deny the IRDG fuel, and still leave an infrastructure that can be recovered in the future when the theocracy falls.
Attacks haven't been on production facilities, nor individual wells, as far as is being told. The delivery portion of the industry is what is being targeted. While all oil industry targets are soft targets, it appears production and the actual refining equipment is being left off the target list. (Unlike Iraq, blowing wellheads all over Kuwait in anticipation it would take far longer to put those wells back into production.)