Core cutterhead
18 July 2017Crooked hole
18 July 2017Crater
Term meaning the hole is caving in. To crater refers to the results that sometime accompany a violent blowout during which the surface surrounding the wellbore falls into a large hole blown in the earth by the force of escaping gas, oil, and water. To crater also refers in oilfield slang to any mishap which may occur to the men or the equipment.