***** The audio is really bad on so many levels in this recording. Please, use speakers for listening to this one. Otherwise you might seriously damage your ears. *****
(And if you find a better source, please share)
The audiobook: https://www.youtube.com/playlist?list=PLWx8WLzNnQCTgMWOVJqta2-l7-G9_5lsl
The book can be viewed and downloaded: https://theanarchistlibrary.org/library/various-authors-ecodefense-a-field-guide-to-monkeywrenching
I think you are totally right and wild guess would be that this could be on purpose. If I remember correctly the actions suggested in this book are related to what you can do in the open and without breaking into buildings. Petroleum refineries are a sort of a cluster of building structures and I suppose transformer cooling oil machines are kept indoors.
That said, and to my knowledge, drilling equipment is in the open, but in private properties. Tbh I don't remember examples in the book that suggest breaking into private properties neither, but I could be wrong. So, if this argument of mine doesn't hold water, I am more than open to reconsider.