دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

friction reducing material composed of very small particles. Also used in lab tests to simulate mud cutting fines.

v/n: 1. The intentional pumping of wellbore fluids down the annulus and back up through the drillpipe. This is the opposite of the normal direction of fluid circulation in a wellbore. Since the inside volume of the drillpipe is considerably less than the volum

circulating down the annulus and up the tubing.

n: the course of drilling fluid downward through the annulus and upward dlrough the drill stem, in contrast to normal circulation in which the course is downward through the drill stem and upward through the annulus. Seldom used in open hole, but frequently used in workover operations. Also refers to as circulating the short way," since returns from bottom can be obtained more quickly than in normal circulation. Compare normal circulation.

n: A kind of preventing blowout ways .

n: a type of in situ combustion in which the combustion front moves counter to the direction of the injected air. Air is injected into a production well and burning is started near the well. When the combustion zone has advanced a short distance from the well. air injection is stopped from the production well and started from an adjacent injection well. The fire advances toward the injection well, but the oil moves toward the production well. This method may be used with very viscous oils. Compare forward combustion.

n: a sudden decrease in the rate of penetration. When drilling with an oil mud and diamond bit, and an abnonnally high-pressure formation is penetrated, the penetration rate may decrease rather than increase. An increase is a drilling brealc..

n: a relatively rare oilfield emulsion composed of globules of oil dispersed in water. Most oilfield emulsions consist of water dispersed in oil.

n: a dip-slip fault along which the hanging wall has moved upward relative to the footwall. Also called a thrust fault.

n: a method of joining a pipeline to a subsea riser on an offshore platform. In this method the pipe is welded together on the platform itself and then fed down through a guide tube to the seafloor. Compare J-tube method.