The nuclear deal with Iran is likely to increase supply of crude oil, especially in European markets, driving down prices.
Brent crude August 2015 contract (CBQ15 above) is testing support at $56 per barrel. Narrow consolidation suggests continuation of the down-trend. Breach of $56 would signal a test of primary support at $53.
Nymex (WTI) Light Crude August 2015 contract (CLQ15) is in a similar pattern, with medium-term support at $51 and primary support at $49 per barrel.