دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a joint to connect blowout preventers of different sizes or pressure ratings to the casing head.

n: A joint used to connect BOPs with different sizes or working pressures and casing head.

n: an area over which an air mass rests and develops temperature and moisture characteristics typical of that location.

n: a large, sloping sedimentary deposit at the mouth of a canyon, laid down by intermittently flowing water, especially in arid climates, and composed of gravel and sand. The deposit tends to be coarse and unworked, with angular, poorly sorted grains in thin, overlapping sheets. A line of fans may eventually coalesce into an apron that grows broader and higher as the slopes above are eroded away.

land counterpart of a river delta. Characteristic of sediments that have been transported by a fast moving stream then dropped out of the flow as the stream velocity drops as it spreads out. Typical of zones of heavy water runoff such as found at the base

n: a system in which certain instruments are used to control or to maintain the operating conditions of a process. If conditions become abnormal, this system automatically stops the process and notifies the operator of the problem.

n: pressure produced parallel with the cylinder axis when casing hits a deviation in the hole or a sticky spot and stops. The force pushing down on the pipe causes axial compression.

n: a device made up in the drill stem above the mill to collect bits of junk ground away during a milling operation. During milling, drilling mud under high pressure forces bits of junk up the narrow space between the boot sub and hole wall. When the junk reaches the wider annulus above the boot sub and pressure drops slightly, the junk falls into the boot sub. A boot sub also can be run above the bit during routine drilling to collect small pieces of junk that may damage the bit or interfere with its operation. Also called a junk sub or junk boot.

a device run in the drill string just above the mill to catch cuttings.

n: the part of the brake that presses on the brake drum. On the drawworks, the circular series of brake blocks are bolted to the brake bands with counter- sunk brass bolts;the lining is the frictional, or gripping, element of a mechanical brake.

n: Refers to the lining of brake staple which is consisted of a set of brake blocks. Fixed in the inner surface of brake staple with head aluminium screw. Brake lining stops when the surface of brake holds the brake drum.

n: in crane operations, a sling composed of several legs, the tops of which are gathered in a fitting that goes over the cranes lifting hook. See leg.

the point in the well or the weight applied where the pipe buckles (sinusoidal bending) and stops or significantly slows during pipe running in a horizontal well.

n: a drilling method in which the hole is drilled by the rigs equipment dropping a sharply pointed and heavily weighted bit on bottom. The bit and weight are attached to a cable, and the rigs equipment repeatedly drops the cable to drill the hole.