Verfahren und Vorrichtung zur Unterquerung eines Hindernisses durch eine Rohrleitung

摘要

A first well bore is drilled from one side of an obstruction, such as a river. A second well bore is drilled from the other side until it intersects the first well bore. Casing is run into both well bores and connected together at the intersection of the well bores to provide a conduit for connecting the pipeline sections on opposite sides of the obstruction.