Oil services giant Schlumberger is in advanced talks to acquire its smaller rival Smith International, according to a report in the Wall Street Journal. The paper said that a deal between Schlumberger and Smith, who both have headquarters in Houston, Texas, could be announced in the next few days, though it could not say how much such a deal would be worth. However, with Smith International valued at roughly $7.5 billion, the purchase price could be around the $9 billion mark, if the company were acquired at a 20 percent premium.