دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the high-velocity ejection of a stream of drilling fluid ". from the nozzles of a jet bit to remove rock encountered during drilling. Sometimes sand or steel shot is added to the drilling fluid to increase its erosive capabilities.

n: drilling adopting flowing fluid with high speed from the spray head of the jet bit eroding the rock in the bottom

n: a drilling bit having replaceable nozzles through which the drilling fluid is directed in a high-velocity stream to the bottom of the hole to improve the efficiency of the bit. See bit.

n: a drilling bit that has replaceable nozzles through which the mud is circulated.the high velocity of the mud leaving the nozzles improves drilling efficiency.

n: a special jet bit that has a very large nozzle used to deflect a hole from the vertical. The large nozzle erodes one side of the hole so that the hole is deflected off vertical. A jet deflection bit is especially effective in soft formations.

n: a special jet bit.

n: 1 a passageway through jet bits that causes the drilling fluid to be ejected from the bit at high velocity. The jets of mud clear the bottom of the hole. Nozzles come in different sizes that can be interchanged on the bit to adjust the velocity with which the mud exits the bit. 2. the part of the fuel system of an engine that has small holes in it to permit fuel to enter the cylinder. Properly known as a fuel-injection nozzle, but also called a spray valve. The needle valve is directly above the nozzle.

n: a part that flows the fluid on the head of bit.

a shaped orifice for directing fluid flow.

n: see jet deflection bit.

n: under the certain pump, drill structure and fluid performance condition, the nozzle diameter can realized the designed jet bit drilling method.

n: under the certain pump, drill structure and fluid performance condition, the rate of mud flow can realized the designed jet bit drilling method.

n: The drilling that using the two-jet bit.which can improve the rate of drilling .

n: This kind of three-cone bit has a major jet,which can buildup well deviation at designed direction,usually be used in side track.