دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

by weight of water.

n: A method of drilling a well by allowing a weighted bit (or chisel) at the bottom of a cable to fall against the formation being penetrated. The cuttings are then bailed from the bottom of the well bore with a bailer.

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.

n: one of the alkaline earth elements with a valence of 2 and an atomic weight of about 40. Calcium compounds are a common cause of water hardness. Calcium is also a component of lime, gypsum, and limestone.

n: CaBr2`6H2O, white powder. A kind of liquid heavy weight additive, usually for heavy brinish completion fluid.

CaBr2, water soluble brine weighting agent.

n: a chemical combination of calcium, carbon, and oxygen, CaCO3 It is the main constituent of lime-stone. It forms a tenacious scale in water-andling facilities and is a cause of water hardness.

n: CaCO3, white powder or crystal. Used for fluid loss agent of non-soil phase completion fluid and heavy weight additive of drill fluid.

CaCO3, limestone, a common formation or when in particles, a weighting or fluid loss agent.

n: a moisture-absorbing chemical compound, or desiccant, CaCI2, used to accelerate setting times in cement and as a drying agent. It is also added to fresh water to increase the waters weight and to give it desirable properties during well completion or workover.

n: CaCl2, a kind of absorption chemical compound.Usually used for calcium mud and heavy weight additive of completion fluid.

CaCl2, a water soluble brine weighting agent.

the ratio, either on a weight or on a molecular basis, of carbon-to-hydrogen in a hydrocarbon material. Materials with a high carbon/hydrogen ratio (e.g., coal) are solid. The ratio is useful as a preliminary indication of the hydrogen quantity needed to

n: see float collar.

n: The collar with back pressure control valve, installed at the bottom of casing string. Prevents drill fluid entering into casing and decreases the weight of casing by buoyance. Also prevent cement recirculating when cementing.

n: see float shoe.

n: The Steel and round nipple with back pressure control valve, installed at the bottom of casing string. Leading casing entering into the wellbore and preventing drill fluid entering into the casing to decrease the weight of casing.