دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an irregular surface, generally parallel to a depositional layer, in which small, toothlike projections on one side of the surface fit into cavities of complementary shape on the other surface.

a pressure dissolution feature in a layered reservoir, often a vertical permeability barrier.

n: a deep trench formed in the ocean floor along the line of convergence of oceanic crust with other oceanic or continental crust when one plate (always oceanic) dives beneath the other. The plate that descends into the hot mantle is partially melted. Magma rises through fissures in the heavier, unmelted crust above, creating a line of plutons and volcanoes that eventually form an island arc parallel to the trench.

n: congressional act that grants coastal states jurisdiction over a belt of submerged lands that extend seaward off the coastlines to a distance of 3 geographical miles (9 miles for Texas and Florida). Various state agencies are given authority under this act to enforce state environmental provisions for these lands.

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.

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.

a downhole safety valve designed to close when the flow rate reaches a preset level as measured by a pressure drop across a valve.

n: the environment below the surface of the earth;groundwater, deep water, underground formations, etc. subsurface geology n: the study of rocks that lie beneath the surface of the earth. subsurface safety valve n: see tubing safety valve.

a downhole safety valve designed to shut the well in case of surface damage to the wellhead.

n: a special steel pumping rod. Several rods screwed together make up the mechanical link from the beam pumping unit on the surface to the sucker rod pump at the bottom of a well. Sucker rods are threaded on each end and manufactured to dimension standards and metal specifications set by the petroleum industry. Lengths are 25 or 30 feet (7.6 or 9.1 metres);diameter varies from 0.5 to 1.5 inches (12 to 30 millimetres). There is also a continuous sucker rod (trade name: CorodTM).

a string or solid or hollow tubular that is moved by a pump jack at the surface to operate a rod pump at the bottom of the well.