دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

The ram sections in a BOP that are used to close against each other and isolate the well when no pipe is in the well.

n: a technique in squeeze cementing in which (1) the zone below the producing interval is perforated and a high pressure squeeze carried out;(2) the zone the producing interval is perforated and squeezed off in a similar manner;(3) the hole is drilled out;and (4) the producing interval is perforated. The purpose of block squeezing is to isolate the producing interval and prevent communication with the sand immediately above and below the producing interval.

a cement squeeze into a area of perforations. Often done initially over the frac pressure.

n: a cement wiper plug that precedes cement slurry down the casing. The plug wipes drilling mud off the walls of the casing and prevents it from contaminating the cement. See cementing, wiper plug. bottompull method n: an offshore pipeline construction technique in which the pipe string remains below the surface while it is towed to its final location.

n: See bottom wiper plug.

in cementing, the first plug pumped in cementing with the two plug system. It isolates the mud and cement slurry and allows passage of the cement slurry when the plug “bumps” or reaches the float shoe or float collar. It is hollow with a diaphragm that is

n: a downhole tool, composed primarily of slips, a plug mandrel, and a rubber sealing element, that is run and set in casing to isolate a lower zone while an upper section is being tested or cemented.

n: A kind of down hole tool. Mainly made by slip, mandril and rubber closely element.

a permanent or retrievable plug set typically on wireline to isolate a section of the well.

n: 1. a rope of wire, hemp, or other strong fibers;often, but not always, personnel in the petroleum industry call it cable wire rope. 2. braided wire used to conduct electricity, often called power cable.

n: See wire rope.

one of various braided cables, with or without isolated conductance wires, used for well operations.

a drillable plug that can be quickly and reliable set to isolate a section of the well.

n: liquid chemical compounds that are injected into lines carrying fluids that contain H2S, Most of these inhibitors are designed to coat equipment surfaces to physically isolate them from compressive substances. Others react with sulfur compounds to form less-destructive compounds.

n: an arrangement of piping and special valves, called chokes. In drilling, mud is circulated through a choke manifold when the blowout preventers are closed. In well testing, a choke manifold attached to the wellhead allows flow and pressure control for test components down- stream.

n: A set of high-pressure valves and associated piping that usually includes at least two adjustable chokes, arranged such that one adjustable choke may be isolated and taken out of service for repair and refurbishment while well flow is directed through the

a set of valves and/or chokes used to control drilling fluid returns on a drilling well or, in a few cases, used to control flow from a high rate well where the chokes may be in parallel or series.

n: the empty space between two bulkheads that separates two adjacent compartments. It is designed to isolate the two compartments from each other, thereby preventing the liquid contents of one compartment from entering the other in the event of the failure of the bulkhead of one to retain its tightness. In oil tankers, cargo spaces are always isolated from the rest of the ship by cofferdams fitted at both ends of the tank body.

n: a sedimentary rock composed of pebbles of various sizes held together by a cementing material such as clay. Conglomerates are similar to sandstone but are composed mostly of grains more than 2 millimetres (0.08 inch) in diameter. Most conglomerates are found in discontinuous, thin, isolated layers;they are not very abundant. In common usage, the term conglomerate" is restricted to coarse sedimentary rock with rounded grains;conglomerates made up of sharp, angular fragments are called breccia.

poorly sorted collection of sediments, generally formed in a very high energy environment. Similar to sandstones but have much larger grains (pebbles grade 4 to 64 mm). The space between the grains may be partly or completely filled with sand grains.