دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: which is joined with the drill pipe or the bottom of flow string and lied under the FO cementer closing sleeve,used to the pressure of drill stems weight to open the FO cementer collar valve orifice .

n: a special drilling fluid that contains a salt or an ester of formic acid (formate),which is chemically combined with another element such as potassium or cesium. Formate fluids are very stable at high temperatures and can be made very dense (heavy) without adding weighting materials such as barite. Formate fluids are used as completion fluids because they minimise formation damage. See completion fluid, formation damage.

n: in condition of purified bottom hole,drill speed is linear with drill pressure in big ranges.

n: (PbS) lead sulphide. Technical grades (specific gravity about 7) are used for increasing the density of drilling fluids to points impractical or impossible with barite. gall n: damage to steel surfaces caused by friction and improper lubrication.

n: leadsulphate. Technical grades (specific gravity gbout 7) are used for increase density of drilling fluids to points impractical or impossible with barite.

lead sulfide, PbS. A mud weighting additive for high mud weights.

ratio of the gas density to the density of air. Equal to the ratio of molecular weight of gas to that of air (28.97).

n: a drilling mud that contains entrained formation gas, giving the mud a characteristically fluffy texture. When entrained gas is not released before the fluid returns to the well, the weight or density of the fluid column is reduced. Because a large amount of gas in mud lowers its density, gas-cut mud must be treated to reduce the chance of a kick.

n: determining the liquid level of a tank so that its volume can be calculated. Usually done by lowering a weighted graduated steel tape through the tank roof and noting the level at which the oil surface cuts the tape when the weight gently touches the tank bottom. It can also be done by measuring the distance between liquid height and a reference point and subtracting the distance from the gauge height to determine liquid height.

n: a casing string made up of several weights or grades of casing and designed to take into account well depth, expected pressures, and weight of the fluid in the well. Also called mixed string.

n: (GPG) a unit of measure for the strength, or concentration. of a solution. It is based on a unit of weight called the grain, which equals 0.002285 ounce, or 0.0648 gram. One grain per gallon equals 0.058479 part per million.

n: a unit of metric measure of mass and weight equal to 1/1,000 kilogram and nearly equal to 1 cubic centimetre of water at its maximum density.