The drillships is one of Mobile offshore drilling units (MODUs, pronounced "moe-dooz"). which popular in the late 1950's to the late 1960's.
Drillships are differentiated from other offshore drilling units by their easy mobility. While semisubmersible rigs can also drill in deep waters, drillships are able to propel themselves from well to well and location to location, unlike semisubs, which must rely on an outside transport vessel to transfer them from place to place.
A drillship is a merchant vessel designed for use in exploratory offshore drilling of new oil and gas wells or for scientific drilling purposes. In most recent years the vessels are use in deepwater and ultra-deepwater applications, equipped with the latest and most advanced dynamic positioning systems.
Drillships are specially built seagoing vessels that also drill in waters as deep as 12,000 feet. Drilling equipment is installed on the deck, with the derrick normally placed in the middle of the ship. The well is drilled through an opening (called a "moon pool") that extends to the water's surface below the derrick.
Because of their cargo-carrying capacity and exceptional mobility, drillships are especially useful for drilling exploratory wells. Although they are not as stable as semisubmersibles in rough water, they can be moved from location to location much faster. They maintain their position through mooring or dynamic positioning systems.
The drillship can be used as a platform to carry out well maintenance or completion work such as casing and tubing installation, subsea tree installations and well capping. Drillships are often built to the design specification to meet the requirements set by the oil production company and/or investors.
No comments:
Post a Comment