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: a mobile submersible drilling structure used in arctic areas. The rig is towed onto the drilling site and submerged during periods when the water is free of ice. All equipment below the waterline is surrounded by a caisson to protect it from damage by moving ice. The drilling deck has no square comers so that moving ice can better flow around it. See submersible drilling rig.

n: any method used to raise oil to the surface through a well after reservoir pressure has declined to the point at which the well no longer produces by means of natural energy. Sucker rod pumps, gas lift, hydraulic pumps, and submersible electric pumps are the most common means of artificial lift.

one of several methods that provide pressure assistance to increase flow from a well. The most common systems lighten (decrease density) of the flowing fluid (gas lift),or remove all or part of the liquid head from the reservoir (beam and electric submer

n: a mobile submersible drilling structure constructed of several steel cylinders or bottles. When the bottles are flooded, the rig submerges and rests on bottom;when water is removed from the bottles, the rig floats. The latest designs of this type of rig drill in water depths up to 100 feet (30.5 metres). See submersible drilling rig.

n: the pressure exerted on the bottom hull of a columnstabilised semisubmersible drilling rig when the hull is submerged to drilling water depth.

n: a submersible pump configuration in which the pump and die motor sections are reversed, with the pump intake through a stinger at the bottom of the unit. It is used where casing size prohibits the desired production volume because of tubing friction loss or pump diameter restriction.

n: a type of mobile offshore drilling unit (MODU) that has a part of its structure in contact with the seafloor when it is on site and drilling a well. The remainder of the rig is supported above the water. The rig can float. however, allowing it to be moved from one drill site to another. Bottom-supported units include submersible rigs and jack up rigs. See mobile offshore drilling unit.

n: any of the rod pumps, high-pressure liquid pumps, or centrifugal pumps located at or near the bottom of the well and used to lift the well fluids. See centrifugal pump. hydraulic pumping. submersible pump. sucker rod pumping.

n: a form of electric submersible pumping for artificial lift, in which the pump can be run or pulled on the power cable. This type of pump installation is made possible by power cables designed for tensile loads in excess of 100,000 pounds (45,360 kilo- grams).

n: 1. one of several columns made of steel or concrete that serve as the foundation for a rigid offshore platform rig, such as the concrete gravity platform rig. 2.equipment below the waterline of an Arctic submersible rig, thereby protecting the equipment from damage by moving ice.