Some 368 horizontal drilling rigs are in operation in Texas, and more than half of them belong to three drilling companies.

In figures exclusively provided to the Houston Chronicle, the Austin oilfield data firm Enverus reports that Tulsa-based Helmerich & Payne is the top drilling rig operator in Texas with 117 horizontal rigs deployed across the state.

Nabor Industries, a drilling rig operator headquartered in Bermuda with principal offices in Houston, ranks second with 42 active horizontal rigs. Calgary oilfield service company Ensign Energy Services ranks third with 33 horizontal drilling rigs deployed in Texas. Read more…