The transmission pipeline typically has higher pressure than that of the well so the compressor is used to "force" the gas into the truckline. The tank batteries are there to store the oil and saltwater until a truck can come by and unload it. Most fields don't have pipelines to the individual wells but instead have a central tank battery. There is really nothing to fear around a well unless you are smoking and stick your head inside the tanks to see its contents. That happened around here the other day and they found the two people about two hundred yards away. Also, kids getting electrocuted or mangled from hanging around pump jacks every year. They run on timers.
Apparently there's some confusion here on my part and maybe KT rider's re the hydrogen sulfide gas. H2S(hydrogen sulfide) is a naturally occurring gas; H2S2(hydrogen disulfide) is a stinky inorganic compound that quickly decomposes to H2S and free sulfur I suppose.
In any case, you're submitting these sites all around us may in fact be hydrogen sulfide wells. Could be. I've not looked into it any further to determine that. I just assumed this was being extracted from sour gas/oil.
I decided to do a screen grab from Google Earth of the site I checked out for grins and purposes of discussion:
Thanks for the info.