Cramer explained that on the Schlumberger call, the company's CEO said that oil's return to $80 a barrel is based on real demand, not speculation, and that demand will kick off a whole new drilling cycle as drillers begin drilling in earnest to cash in on higher prices.
Based on this bullish sentiment, Cramer said investors now "must own" an oil driller, as he believes oil is headed back to $100 a barrel over the next 12 months.