دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a joint with ball valve and connected between the pipe and the kelly bar

v: to carry on drilling operations with a mud whose density is such that it exerts less pressure on bottom than the pressure in the fonnation while maintaining a seal (usually with a rotating head) to prevent the well fluids from blowing out under the rig. Drilling under pressure is ad- vantageous in that the rate of penetration is relatively fast;however, the technique requires extreme caution.

n: a permanent packer, drillable in nature, capable of withstanding extreme working pressures, for remedial work. It has a positive flow-control valve built in.

n: the phenomenom of conspicuous volume -broden when the drilled gas reaches the shallow well section

n: an internal-combustion engine used to power a drilling rig. From two to six engines are used on a rotary rig and are usually fueled by diesel fuel, although liquefied petroleum gas, natural gas, and, very rarely, gasoline can also be used.

n: the internal combustion engine used as drilling rig power

n: an assembly equipment composed with cyclone group and several vibrosieves

n: the physical and chemical characters of the drilling fluid including density, viscosity,shear force,filter loss,sediment charge,PH value and so on

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.