دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the specific gravity of the set well cement, generally about 3.15 for Portland cement. Do not confuse with slurry density.

n pi: a slurry of portland cement and water and sometimes one or more additives that affect either the density of the mixture or its setting time. The portland cement used may be high early strength, common (standard),or slow setting. Additives include accelerators (such as calcium chloride),retarders (such as gypsum),weighting materials (such as barium sulphate),lightweight additives (such as bentonite),or a variety of lost circulation materials (such as mica flakes).

n: The bonding material for cementing.

construction grade Portland cement.

n: a regular portland cement classified as either API Class A or ASTM Type I cement.

n: The standard Portland cement. Classify into API A class or ASTM I class. Mainly used for general concrete composition and augering. No special demand.

n: trade name for a chemical additive for portland cement that reduces the effect of contamination of cementing slurries by the organic chemicals commonly found in drilling muds.

n: the cement most widely used in oilwells. It is made from raw materials such as limestone, clay or shale, and iron ore.

n: The product obtained by pulverizing clinker consisting essentially of hydraulic calcium silicates. Portland cement is the most common type of cement used for oil- and gas-well cementing.

a general class of cement that encompasses the most common cements used in construction and the oil field.

hard, approximate marble-sized nodules of calcium silicates and other additives that are the feed stock for making cement.

n: a natural or artificial siliceous material commonly added to portland cement mixtures to impart certain desirable properties. Added to oilwell cements, pozzolans reduce slurry weight and viscosity, increase resistance to sulfate attack, and influence factors such as pumping time, ultimate strength, and watertightness.

n: A siliceous or siliceous and aluminous material that possesses little or no cementitious value. In a finely divided form and in the presence of moisture, however, pozzolan reacts chemically with calcium hydroxide to form compounds possessing cementitious

n: an oilwell cement that is composed of resins, water, and portland cement and that provides an improved cement bond. It is mainly used in remedial operations, because its high cost prohibits its use for routine cementing of casing.

n: a kind of cement made up by synthetic resin and cement ,and the cake of this cement being able to prevent the cement slurry seeping into the deep formation to protect the oil or gas layer