IMHO it is more about Iran than Greece, what they have in storage waiting to go to market, their production that might come on line and the continued over production by Opec. Opec is now exceeding their current production "limit" by about 1.25 mill bpd with Iran still under sanctions.
That said I have been buying CPG this last few days as I mentioned on $Speak last week. CPG held in very nicely today on very high volume, not many oil stocks had positive price action today. XEG index was down 2.23% on the oil price action. Often that kind of support spells bottoms on a stock like CPG. No risk, no reward. A buy signal on the stochastic was generated today as well. Only time will tell as oil could easily drop further despite being very over sold on the oscillators. The outcome regarding Iran will no doubt impact that.