دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the use of a mill or similar downhole tool to cut and remove material from equipment or tools located in the wellbore. Successful milling operations require appropriate nselection of milling tools,fluids and techniques.the mills,or similar cutting tools,m

removing a blockage, fish or casing wall by drilling with a metal-cutting device to gain access to the area beyond.

injection of a large volume of gas from an injection well where the gas is designed to lower the viscosity of the oil and help displace it towards the wellbore.

n: a drilling technique that uses air or gas to which a foaming agent has been added.

n: A variation of air drilling in which a small amount of water trickles into the wellbore from exposed formations and is carried out of the wellbore by the compressed air used for air drilling. The onset of mist drilling often signals the impending end of p

n: schlumberger wireline tool that allows pressure testing and sampling of formation fluids by a probe which seals against the wellbore. Sample chambers are available in three sizes and many pressure tests can be made in a single trip. Used for anisotropic p

n: a hydraulic or pneumatic device usually installed between the travelling block and hook.its function is to keep a more constant weight on the drillbit when drilling from a floating vessel.as the rig heaves up and down,a piston moves within the device to c

n: the liquid circulated through the wellbore during rotary drilling and workover operations. In addition to its function of bringing cuttings to the surface, drilling moo cools and lubricates the bit and the drill stem, protects against blowouts by holding back subsurface pressures, and deposits a mud cake on the wall of the borehole to prevent loss of fluids to the formation. Although it originally was a suspension of earth solids (especially clays) in water, the mud used in modem drilling operations is a more complex, three-phase mixture of liquids, reactive solids, and inert solids. The liquid phase may be fresh water, diesel oil, or crude oil and may contain one or more conditioners. See drilling fluid.

n: common term for drilling fluid.

drilling mud. Usually a slurry of weighting and fluid-loss control solids in a liquid.

n: a mixture of hydrochloric and hydrofluoric acids and surfactants used to remove wall cake from the wellbore.

n: also called earth acid, it is mixture of hydrogen chloride, hydrogen fluoride and surface acting agent.




an inexact term, usually meaning a mixture of hydrochloric (HCl) and hydrofluoric acid (HF),HCL/HF. HF will dissolve some silicates and some of the components of drilling mud.

n: a continuous examination of the drilling fluid circulating in the wellbore for the purpose of discovering evidence of oil or gas regardless of the quantities entrained in the fluid. When this service is utilised, a portable mud logging laboratory is set up at the well. Also called mud logging.

n: see mud weight.

n: The mass per unit volume of a drilling fluid, synonymous with mud density. Weight is reported in lbm/gal (also known as ppg),kg/m3 or g/cm3 (also called specific gravity or SG),lb/ft3 or in hydrostatic gradient, lb/in2/ft (psi/ft) or pptf (psi/1000 ft).

the specific gravity of the mud expressed in lb/gal, kg/m3, etc.

n: a trough or pipe that is placed between the surface connections at the wellbore and the shale shaker and through which drilling mud flows on its return to the surface from the hole. Also called flow line.

n: a though or pipe through which the mud being circulate up the annulus is transferred from the top of wellbore to the shale shakers (q.v.).sometimes calledflowline.