دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a joint used to contain the drill pipe safety valve and connected to the drilling pipe

n: see lower kelly cock.

a full opening valve with threads that match the drill pipe that can be quickly screwed onto the pipe to help control fluid flow up the tubing.

n: a kind of valve joined to the top of the drilling pipe ,and used when there is no inverted valve or the inverted valve is out of work in the pipe

n: an exploratory drilling to define the drill pressure and rotate speed at the least cost when use new bit or the layer is variable

n: an exploratory drilling to define the drill pressure and rotate speed at the least cost when use new bit or the layer is variable

n: all members in the assembly used for rotary drilling from the swivel to the bit, including the kelly, the drill pipe and tool joints, the drill collars, the stabilizers, and various specialty items. Compare drill string

n: All the components from the swivel down to the bit.

typically, rotating components in a drill string.

n: a special valve normally installed below the kelly. Usually, the valve is open so that drilling fluid can flow out of the kelly and down the drill stem. It can, however, be manually closed with a special wrench when necessary. In one case, the valve is closed and broken out, still attached to the kelly to prevent drilling mud in the kelly from draining onto the rig floor. In another case, when kick pressure inside the drill stem exists, the drill stem safety valve is closed to prevent the pressure from escaping up the drill stem. Also called lower kelly cock, mud saver valve.

n: (DST) the conventional method of formation testing. The basic drill stem test tool consists of a packer or packers, valves or ports that may be opened and closed from the surface, and two or more pressure-recording devices. The tool is lowered on the drill string to the zone to be tested. The packer or packers are set to isolate the zone from the drilling fluid column. The valves or ports are then opened to allow for formation flow while the recorders chart static pressures. A sampling chamber traps clean formation fluids at the end of the test. Analysis of the pressure charts is an important part of formation testing.

n: during drilling or affter well completation ,lower the drillstem tester into the layer to make the pressure build up test so as to eatimate the layers and the fluid parameters

n pi: formation gases that are produced during a drill stem test, which is the conventional method of testing formations. Although these gases typically are produced only in very small quantities and consist mainly of natural gas, they become an environmental concern when the gases fall into the extremely hazardous substance category under SARA and are produced in sufficient quantities so that they exceed the TPQ limit set for that substance. Typically, wells are not set up for production operations when the drill stem test is run;consequently, gas-containment equipment is not installed or operational during the running of the test and such gases must be released or flared.

n: a check valve in the drill string that will allow fluid to be pumped into the well but will prevent flow from entering the string.

n: refer todrill pipe float