05.07.2009
Sorry, this entry is only available in עברית.
A sudden increase in the rate of penetration during drilling. When this increase is significant – two or more times the normal speed – it may be due to a change in the formation, a change in the pore pressure of the formation fluids or both. It often means that the bit has drilled into sand (high-speed drilling) rather than shale (low-speed drilling)
Drilling barges are mobile drilling platforms that are submersible and are built to work in seven to twenty feet of water. They are towed by tugboats to the drill site with the derrick lying down. The lower hull is then submerged by flooding compartments until it rests on the river or sea floor. The derrick is then raised and drilling operations are conducted with the barge resting on the bottom.
is the member of the drilling crew who operates a drilling rig; the person in charge of drilling operations and who supervises the drilling crew.
The act of boring a hole to determine whether hydrocarbons are present in commercially recoverable quantities in order to be able to produce these hydrocarbons. Drilling can be at first for exploratory purposes followed later by a development drilling. Drilling an oil/gas well is complex, expensive and potentially hazardous. The work is carried out by a drilling contractor under the supervision of the operating company. Wells are designed by a multi-disciplinary team comprised of drilling engineers, petroleum engineers, geologists and geophysicists in order to achieve the well’s objectives safely and at a reasonable cost
Drillships are exactly as they sound: ships designed to carry out drilling operations. These boats are specially designed to carry drilling platforms out to deep-sea locations. A typical drillship will have, in addition to all of the equipment normally found on a large ocean ship, a drilling platform and derrick located on the middle of its deck. In addition, drillships contain a hole (or ‘moonpool’) extending right through the ship down through the hull, which allow for the drill string to extend through the boat, down into the water. Drillships are often used to drill in very deep water, which can often be quite turbulent. Drillships use what is known as ‘dynamic positioning’ systems. Drillships are equipped with electric motors on the underside of the ships hull, capable of propelling the ship in any direction. These motors are integrated into the ship’s computer system, which uses satellite positioning technology, in conjunction with sensors located on the drilling template, to ensure that the ship is directly above the drill site at all times.