I'm running fever right now so I'll probably screw

I'm running fever right now so I'll probably screw up what I saying about packers , but from what I read from Treaty there's pressure in that we'll . They will have to mud up before they pull the packer and do what work they need to do. I like the fact there is pressure . Gas could be causing that pressure you can't compress water but heat could cause water to expand but my bet is its gas . Oil anyone