دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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

n: a method of rotary drilling that uses compressed air as the circulation medium. The conventional method of removing cuttings from the wellbore is to use a flow of water or drilling mud. Compressed air removes the cuttings with equal or greater efficiency. The rate of penetration is usually increased considerably when air drilling is used;however, a principal problem in air drilling is the penetration of formations containing water, since the entry of water into the system reduces the ability of the air to remove the cuttings.

n: A method of rotary drilling that uses compressed air as the circulating medium.

drilling with air instead of drilling mud (requires diverters at the surface to handle cuttings and formation fluids).

n: the cutting or boring element used in drilling oil and gas wells. The bit consists of a cutting element and a circulating element. The cutting element is steel teeth, tungsten carbide buttons, industrial diamonds, or polycrystalline diamonds (PDCs). The circulating element permits the passage of drilling fluid and utilises the hydraulic force of the fluid stream to improve drilling rates. In rotary drilling, several drill collars are joined to the bottom end of the drill pipe column, and the bit is attached to the end of the drill collars.

a drill bit, commonly either a roller cone, button bit, PDC, diamond or drag bit, used with a rotary string or a mud motor to drill through rock.

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.

n: a light rig that has the essential elements for both rotary and cabletool drilling. It is sometimes used for reconditioning wells.

n: A kind of lightweight drill rig possessing rotary drilling and cable drilling.

n: the rotary drilling system that uses a conventional swivel, a kelly, a kelly drive bushing, a master bushing, and a rotary table to turn the drill stem and bit. Compare top drive.

n: all members in the assembly used for rotary drilling from the swivel to the bit, including the kelly, the drill pipe and tool joints, the drill collars, the stabilizers, and various specialty items. Compare drill string

n: All the components from the swivel down to the bit.

typically, rotating components in a drill string.

n: a specially compounded liquidcirculated through the wellbore during rotary drilling operations. See drilling fluid, mud.

n: A circulating fluid used in rotary drilling to perform any or all of various functions required in the drilling operation.

the fluid, water, oil or gas based, that is used to establish well control, transport cuttings to the surface, provides fluid loss control, lubricates the string and cools the bottom hole assembly.

n: a method to prevent inclination and correct drift in rotary drilling