Questar Corp. announced this week that it has completed the acquisition of HSRTW Inc., a Mid-con-tinent oil and gas operation, from HS Resources Inc.

In the $155 million cash transaction, Salt Lake City-based Questar obtained 150 billion cubic feet equivalent of proved oil and gas reserves, mainly in Oklahoma, but also in Texas, Arkansas and Louisiana. The acquisition included another 50 billion cubic feet equivalent of probable and possible reserves.The newly acquired operation will be renamed Questar Exploration and Production and should increase the company's average daily non-cost-of-service production by 20 percent.