دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: land owned by the United States, acquired by deed or otherwise. Such land has never been in the public domain or was in the public domain at one time and was later reacquired by purchase, condemnation, or donation.

n: see air-cooled exchanger. aerial river crossing n: a river crossing technique in which a pipeline is either suspended by cables over a waterway or attached to the girders of a bridge designed to carry vehicular traffic.

n: in pipeline construction, a combination of anchors used to hold a lay barge on station and move it forward along the planned route. Lay-barge anchors may weigh in excess of 20 tons (18 tonnes),and a dozen or more may be needed.

n pi: total pressure at a depth underwater, expressed as multiples of normal atmospheric pressure.

autonomous underwater vehicle.

n: 1. a flat-decked, shallow-draft vessel, usually towed by a boat. Barges are not self-propelled. They are used to transport oil or products on rivers, lakes, and inland waterways. Also, a complete drilling rig may be assembled on a barge and the vessel used for drilling wells in lakes and in inland waters and marshes. Similarly, well service and workover equipment can be mounted on a barge. 2. an offshore drilling vessel built in the shape of a ship. Unlike a ship, however, it is not self-propelled. Also called a drill barge.

marine vessel without its own propulsion.

n pi: a group of polymers that can maintain or increase the viscosity of bentonite while flocculating other clay solids in the mud. With bentonite extenders, desired viscosity can often be maintained using only half the amount of bentonite that would otherwise be required.

an unperforated piece of casing or tubing in an otherwise perforated section. Used for isolation.

n pl: the lines running from the bow of a mobile offshore drilling rig, especially the forward mooring lines.

n: a small vent in an otherwise airtight enclosure for maintaining equality of pressure inside and outside.