In this article
http://www.fromthewilderness.com/free/ww3/062104_berlin_peak.html
is a reference to a method for pumping oil from aging fields called "bottle-brushing".
Can any one here (perhaps even a petro-engineer) explain me who this method actually works? Why does it lead to an abrupt stop of oilflow? Are there perhaps synonyms for this expression?
Graphics about this method are also welcomed!
thanks!
Mark