Tesco was created in December 1993 when Shelter Oil and Gas Ltd., Coexco Petroleum Inc., and Forewest Industries Ltd. merged as Tesco Corporation, originally Tesco Drilling Technology, a joint venture between the three.
On 30 April 2012, Tesco and Schlumberger announced a deal in which Tesco's CASING DRILLING™ division would be sold to Schlumberger for $45 million in cash [REF].