دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a special type of flanged connection in which a metal ring (resting in a groove in the flange) serves as a pressure seal between the two flanges.

n: a form of corrosion sometimes found in the tubing of condensate wells. It occurs in a ring a few inches from the upset. Cause of ringworm corrosion has been traced to the upsetting process, in which heat required in upsetting causes the heated end to have a different grain structure from the rest of the pipe. Normalizing prevents this condition.

n: a claw-shaped, plowlike attachment used on a bulldozer to loosen rock and locate solid formations that may require explosives in clearing a right-of-way for pipeline construction.

v: to space logs and timbers evenly along the length of a pipeline right-of-way to stabilize soil in swamps or wet areas.

materials (boards, rocks, etc.) arranged to mark a walkway or a barrier.

n: a pipe through which liquid travels upward. See riser pipe.

n: a term initially applied to the assembly of pressure-control equipment used on slickline operations to house the tool string in preparation for running into the well for retrieval of the tool string on completion of the operation. The lubricator is assem

pipe through which liquid travels upward.

n: an acoustic electronic device used to monitor the angle of the flex joint on a floating offshore drilling rig. A small angle should usually be maintained on the flex joint to minimize drill pipe fatigue and wear and damage to the blowout preventers and to maximize the ease with which tools may be run. Also called azimuth angle indicator.

n: the act of removing the riser pipe (marine riser) from its attachment to the subsea blowout preventer stack.

n: the slight increase in mud weight used to offset friction losses that occur as the mud is circulated through the riser in a subsea blowout preventer system.

n: the pipe and special fittings used on floating offshore drilling rigs to establish a seal between the top of the wellbore, which is on the ocean floor, and the drilling equipment, located above the surface of the water. A riser pipe serves as a guide for the drill stem from the drilling vessel to the wellhead and as a conductor of drilling fluid from the well to the vessel. The riser consists of several sections of pipe and includes special devices to compensate for any movement of the drilling rig caused by waves. Also called marine riser pipe.