A submersible rig is a mobile drilling platform that is towed to the well site where it is submerged by flooding its lower hull tanks until it rests on the sea floor, with the upper hull above the water surface. After completion of the drilling operation, the rig is refloated by pumping the water out …
The advent of more and more deepwater discoveries brings with them significant challenges. Deeper waters mean higher pressures from not only the wells, but also from the subsea environment. A well at 1,500 meters causes an environmental pressure on the valve of 150 bar or 2,175 psi. At these depths, it is necessary not only …
A depression in the land surface that results from the collapse or slow settlement of underground voids produced by solution weathering. The rock being dissolved is normally limestone but can also be salt, gypsum or dolostone
Method of moving a drilling rig on skids or rollers which are positioned under the derrick. It mostly refers to the process of sliding the rig off from the wellbore or moving it from one well slot to another on a fixed offshore platform. A skid is usually a steel frame on which portable equipment …
A factor calculated to determine the production efficiency of a well by comparing actual conditions with ideal conditions. A positive skin value indicates some impairment of well productivity. A negative skin value indicates enhanced productivity, typically resulting from stimulation
Method of pipelaying that utilizes the elastic properties afforded by steel, making the pipe configuration resemble an ‘S’, with one end on the seabed and the other under tension onboard the ship. This configuration is suited to medium to shallow-water laying.
Sloshing is the phenomenon by which a moving fluid in a tank generates dynamic loads over the structure of the walls. It is a highly nonlinear phenomenon appearing in all marine structures containing liquids and is thus a problem of relative importance in the design of marine structures in general but the effects of sloshing …
A volume of mud that is more dense than the mud in the drillpipe and wellbore annulus. A slug is used to displace mud out of the upper part of the drillpipe before pulling pipe out of the hole. (2) A small volume of fluid, often of a higher density than the main body of …
Arrangement of piping designed to catch a slug of liquid in the gas pipeline to separate it from the gas, or equipment for the purification of water. In a natural gas pipeline, the liquids flow along the bottom of the pipleines (except in steeply inclined and vertical lines) with the gas flowing over the top …
Solar Power company was established in 2003 and deals with the installation of photovoltaic solar systems. This Israeli company carries out activities in Africa where it is active in six different projects. In February 2009 Solar Power established a solar panel on the roof of the Paz petrol station at Maale Adumin at a cost …
