Underbalanced drilling (UBD) intentionally keeps bottomhole pressure below the formation pore pressure to allow controlled inflow while drilling. It sits at the intersection of well construction and ...

The two massive tunnel boring machines that will do the first drilling for the Gateway Rail Tunnel between New York and New Jersey are now in North Bergen, laid out in components across a construction ...

Cross bore drilling is helping revive dry wells and lakes in Mangaluru by tapping nearby groundwater through horizontal ...

Though not as common as overbalanced drilling, underbalanced drilling is achieved when the pressure exerted on the well is less than or equal to that of the reservoir. Performed with a light-weight ...