دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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: a report that lists each bit used during a drilling operation, giving the type, the footage it drilled. the formation it penetrated, its condition, and so on.

a record of bit run, depth, rate of penetration, etc., in a wellbore.

n: a centrifugal device for removing very fine particles, or silt, from drilling fluid to keep the amount of solids in the fluid at the lowest possible point. Usually, the lower the solids content of mud, the faster is the rate of penetration. The desilter works on the same principle as a desander. Com- pare desander.

n: A hydrocyclone with an inside diameter less than 6 inches. It can remove a large fraction of solids larger than 15–20 microns.

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 sudden increase in the drill bits rate of penetration. It sometimes indicates that the bit has penetrated a highpressure zone and thus warns of the possibility of a kick.

n: a phenomenon of the drilling speed abrupt changes when the formation characteristics

change

a sudden increase in the ROP (rate of penetration) while drilling. May indicate a higher pressure formation, a change in lithology, a naturally fractured zone, or a poorly consolidated zone.

n: a device that controls the rate of penetration by maintaining a predetermined constant weight on the bit. Also called an automatic driller or automatic drilling control unit.

n: the equipment which controls the drilling speed without the controls of the driller

n: the speed with which the bit drills the formation;usually called the rate of penetration (ROP).

n: refer to penetration rate

n: an instrument that records hook load, rate of penetration, rotary speed and torque, pump rate and pressure, mud flow, and so forth during drilling. drilling rig n: see rig.

n: the instrment used to record the drillng parameters during drilling such as the drill speed ,rotate speed ,drill pressure ,torque , fluid volume,pump pressure ,hook load and fluid ability and so on

n: a record of the time required for a hole to be drilled;it is a record of the rate of penetration of the bit through various formations encountered during the drilling of a well.

n: refer to drill time recorder

n: trade name for a patented device that automatically records the rate of penetration and depth during drilling.