دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (CAODC) a trade association that represents virtually 100% of the rotary drilling contractors and the majority of well service rig operators in western Canada. The relations, and other matters of interest to members. Address: 540 5th Avenue SW, Suite 800;Calgary, Alberta, Canada T2P OM2;(403) 264-4311;fax (403) 263-3796.

n: A commercial association. Its headquarters is located at Calgary, Albert, Canada. This association practically stands for rotary drilling contractors and oil well operator in the west of Canada.

Measures the fluids capacitance – uses the wellbore fluid as the fluid between plates of a capacitor.

n: No metal clast left in the wellbore to block the formation after perforation by modified jet perforating explosive charge.

adj: pertaining to a wellbore in which casing has been run and cemented. See casing.

n: a wellbore in which casing has been run.

n: The portion of the wellbore that has had metal casing placed and cemented to protect the openhole from fluids, pressures, wellbore stability problems, or a combination of these.

n: 1. steel pipe placed in an oil or gas well to prevent the wall of the hole from caving in, to prevent movement of fluids from one formation to another, and to improve the efficiency of extracting petroleum if the well is productive. A joint of casing may be 16 to 48 feet (4.8 to 14.6 metres) long and from 4.5 to 20 inches (11.4 to 50.8 centimetres) in diameter. Casing is made of many types of steel alloy, which vary in strength, corrosion resistance, and so on. 2. large pipe in which a carrier pipeline passes under railroad rights-of-way and some roads to shield the pipeline from the unusually high load stresses of a particular location. State and local regulations identify specific locations where casing is mandatory.

n: Steel pipe placed in an oil or gas well to prevent the wall of the hole in a drilled interval from caving in, as well as to prevent movement of fluids from one formation to another.


one of several strings of steel pipe in a well design that, together with cement, forms a barrier to fluid movement along the drilled hole. It is commonly at least partly cemented in the wellbore.

n: The clearance between casing and wellbore.

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.

n: A logging method of checking wall thickness of casing. The device is consisted of energizing coil and coupling coil and tripped in the wellbore by cable.