دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: in the case of an oil and gas lease, a supplementary agreement that resolves the priority of rights to the leased property and subordinates an earlier instrument (for example, a mortgage) to the oil and gas lease.

n: a blowout preventer placed on the seafloor for use by a floating offshore drilling rig.

n: a valve mounted in the choke line of a subsea blowout preventer stack. It serves to regulate the flow of well fluids being circulated through the choke line when the well is closed in.

a subsea well.

n: a submersible apparatus similar to a bathysphere in which people are lowered to the ocean bottom to work on the wellheads of completed wells. The wellhead contains a cellar to which the system is attached, creating a dry atmosphere in which to work.

n: a vertical section of pipe that connects pipeline on the sea bottom to a production platform on the surface. The riser is an integral part of the pipeline and is clamped directly to a leg or brace on the platform.

n: see subsea blowout preventer

n: a device placed on the seafloor to facilitate the production of wells. When a template is used, the wells are drilled through the template and are completed and produced on it. Since the erection of a platform to produce the wells is not necessary, marginal offshore fields can sometimes be produced because the expense of erecting the platform is avoided.

n: a device designed to be landed in a subsea wellhead or blowout preventer stack to provide a means of closing in the well on the ocean floor so that a drill stem test of an offshore well can be obtained.