Strata is a specialised drilling-services company headquartered in Alberta, Canada. Its principal business is the provision of under-balanced drilling ("UBD") and managed-pressure drilling ("MPD") services to oil companies. Strata is, on many measures, the third-largest fully-integrated UBD company in the world. It currently has operations in Canada, the United States and Kurdistan.


Crest, which has its headquarters in Dubai, is a business focused on providing oil and gas technology-rich services to the national oil companies and other operators in the Middle East and North Africa. Crest's current commercial activity centres on providing nitrogen-purging services to several customers in Saudi Arabia for major pipeline-infrastructure purging projects.