دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a floating marker used in a spread mooring system to position each anchor of a semi-submersible rig or drill ship. See spread mooring system.

n: the foremost bulkhead that extends from the bottom to the freeboard deck of a drill ship. It keeps the main hull watertight if a collision occurs.

n: 1. an excess of draft at the stem of a ship or drill ship, as compared to the bow.2.friction between a moving device (such as a bit) and another moving or nonmoving part (such as the formation). 3. the bending of rock strata adjacent to a fault.

n: The extra force required to move the drill string owing to the drill strings being in contact with the wall of the borehole.

n: a floating offshore drilling unit with the configuration of a ship but not selfpropelled. Compare drill ship.

n: a self-propelled floating offshore drilling unit that is a ship constructed to permit a well to be drilled from it. Although not as stable as semisubmersibles, drill ships are capable of drilling exploratory wells in deep, remote waters. See floating offshore drilling rig.

n: A specially designed ship used to drill a well at an offshore location.

n: a method by which a floating offshore drilling rig is maintained in position over an offshore well location without the use of mooring anchors. Generally, several propulsion units, called thrusters, are located on the hulls of the structure and are actuated by a sensing system. A computer to which the system feeds signals directs the thrusters to maintain the rig on location.

n: A method by which a floating drilling rig or drill ship is kept on location. A control system of sensors and thrusters is required.

n: a type of mobile offshore drilling unit that floats and is not in contact with the seafloor (except with anchors) when it is in the drilling mode. Floating units include barge rigs, drill ships, and semi-submersibles. See mobile offshore drilling unit.

an outer steel shell that connects a drill ship, jackup or floater to the well template on the ocean floor. The drill string is run through the riser and the returning mud and cutting flow u the drill pipe / riser annulus.

n: a walled round hole or well in the hull of a drill ship, ship-shape barge, or semisubmersible drilling rig (usually in the centre) through which the drilling assembly and other assemblies pass while a well is being drilled, completed, or abandoned.

an open shaft in a deep-sea drilling vessel, usually located in the center of the hull, through which the drilling takes place.

n: drilling for oil or gas from a location that might be in an ocean,gulf, sea or lake. The drilling rig might be on a floating vessel (e.g. semi-submersible,drill ship) or mounted on a platform fixed to the seabed (e.g. jake up, steel jacket).