دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: Made by adding gas into common water base drilling fluid. Mainly used to protect circulation loss in low pressure formation and leakage zone.

n: Used compressive air which replaces flushing fluid as circulation media to cool the bit and carry over cuttings.

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).

usually reverse circulation

n: a drilling operation in which the drilling fluid is not returned to the surface;rather. it flows into an under- ground formation. Sometimes blind-drilling techniques are resorted to when lost circulation occurs.

n: the discharge pipe from a wen being drilled by air drilling. The blooey line is used to conduct the air or gas used for circulation away from the rig to reduce the fire hazard as well as to transport the cuttings a suitable distance from the wen. See air drilling.

v: to begin or start (e.g., to bleak circulation or break tour).

n: To start movement of the drilling fluid after it has been quiescent in the hole.

n: see starting torque. break circulation v: to start the mud pump for restoring circulation of the mud column. Because the stagnant drilling fluid has thickened or gelled during the period of no circulation, high pump pressure is usually required to break circulation.