دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a self-propelled floating offshore drilling unit that is a ship constructed to permit a well to be drilled from it. Although not as stable as semisubmersibles, drill ships are capable of drilling exploratory wells in deep, remote waters. See floating offshore drilling rig.

n: A specially designed ship used to drill a well at an offshore location.

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 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 permanent packer, drillable in nature, capable of withstanding extreme working pressures, for remedial work. It has a positive flow-control valve built in.

n: the solid particles of cuttings whose size ranges from 2 to 74us in drill fluid

n: a special rotating head that has a gear-and-pinion drive arrangement to allow turning of the kelly and simultaneous sealing of the kelly against well pressure.

n: the speed and cost of complting a well

average distance drilled per day divided by the total number of days in a measurement cycle.

n: an internal-combustion engine used to power a drilling rig. From two to six engines are used on a rotary rig and are usually fueled by diesel fuel, although liquefied petroleum gas, natural gas, and, very rarely, gasoline can also be used.

n: the internal combustion engine used as drilling rig power

n: circulating fluid, one function of which is to lift cuttings out of the wellbore and to the surface. It also serves to cool the bit and to counteract downhole formation pressure. Although a mixture of barite, clay, water, and other chemical additives is the most common drilling fluid, wells can also be drilled by using air, gas, water, or oil-base mud as the drilling mud. Also called circulating fluid, drilling mud. See mud.

n: The fluid circulated through the drill string and up the annulus back to surface under normal drilling operations. Usually referred to as mud.

n: the physical and chemical characters of the drilling fluid including density, viscosity,shear force,filter loss,sediment charge,PH value and so on