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Oil majors betting big on shale technology

The technological push comes amid worries that US shale gains are slowing as investors press for higher financial returns

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An oil and gas processing plant fed by local shale wells along a highway outside Carrizo Springs, near the Mexican border, in Dimmit County, Texas.

Houston

SHALE oil engineer Oscar Portillo spends his days drilling as many as five wells at once - without ever setting foot on a rig.

Part of a team working to cut the cost of drilling a new shale well by a third, Mr Portillo works from a Royal

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