دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

The value of the pressure on the bit multiply the rate of drilling in rotary drilling.

n: The technique used in drilling in order to explore and exploit reservoir. Mainly including wellbore designing, bit choosing, drilling parameter optimization, deviation controling, drilling fluid choosing and drilling hydraulics.

n: the motion a bit makes when it does not rotate around its centre but instead drills with a spiral motion. It usually occurs to a bit drilling in a soft or medium soft formation when the driller does not apply enough weight or does not rotate the bit fast enough. A whirling bit drills an overgauge hole (a hole larger than the diameter of the bit) and causes the bit to wear abnormally.

n: Drilling into the formation by the bit impacting.

n: dissolved calcium ions in sufficient concentration to impart undesirable properties, such as flocculation, reduction in yield of bentonite, and increased fluid loss, in a drilling fluid. See also anhydrite, calcium carbonate, calcium sulphate, gypsum, lime.

n: The process that calcium ion enters into the drilling fluid when drilling in the calcareous formation or cement plug.

n: a drilling fluid made up mainly of chemical salts, such as sodium chloride, calcium chloride, or potassium chloride. Clear brine contains little or no clay or other solid material and is virtually transparent. It is often used when drilling into a producing formation because clear brine minimises formation damage. See completion fluid formation damage.

a brine without suspended solids.

n: (CIDS) a structure made primarily of concrete which is designed for drilling in arctic waters. The structure is very strong and is de- signed to withstand the great force of moving ice.

n: (CDU) a drilling structure whose base is shaped like a truncated (cut off) cone. It is designed for drilling in offshore arctic waters, where moving ice can damage the structure. The cone shape helps deflect the ice around the base and keep it intact

n: a well previously drilled in an area of drilling interest, the data from which may be a reliable source of information in the planning of a new well.

n: Usually using high quality adjacent well as the control well to lead other drilling scheme with its geologic information and data in optimized drilling technology.

n: A set of adjustable and controllable variables for building mathematical model of drilling in optimized drilling technology.