barrel and catcher are removed -- and the core sample is retrieved. The drillbit is reattached, and drilling can commence again. When performing coring operations, instead of having the pieces of ...

Some small U.S. shale producers are putting the brakes on oil drilling as crude prices sink to multi-year lows and steep ...

U.S. oil producers are grappling with geological limits to production growth as the country's top oilfield ages and produces ...