دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a fitting that makes an angle between two joints of pipe and that decreases in diameter from one end to the other.

n: a kind of pipe joint with different diameter on both ends and certain degree of bending

n: cement placed in a wellbore after the primary cementing has occurred. Remedial cementing is used to repair holes in the casing, fill voids left behind in casing after primary cementing, stop lost circulation, and so on. Compare primary cementing.

n: Cementing operations performed to repair primary-cementing problems or to treat conditions arising after the wellbore has been constructed. The two main categories of remedial Cementing include squeeze cementing and the placement of cement plugs.

repair cementing.

n: the act of putting enough drilling fluid in the wellbore to replace the volume of any pipe or other tools that were removed.

n: the process in which reservoir fluids are caused to flow out of the reservoir rock and into a wellbore by natural energy. Gas drive depends on the fact that, as the reservoir is produced, pressure is reduced, allowing the gas to expand and provide the principal driving energy. Water drive reservoirs depend on water and rock expansion to force the hydrocarbons out of the reservoir and into the wellbore. Also called natural drive energy.

force exerted by a centralizer against the casing to keep it away from the wellbore wall.

n: a substance added to cement to prolong the setting time so that the cement can be pumped into place. Retarders are used for cementing in high-temperature formations.

n: A chemical additive used to increase the thickening time of cement slurries or similar fluids that may have a limited pumping time. The increased pressure and temperature typically associated with deep wellbores requires the use of such performance-enhanc

a chemical that slows a reaction. In cementing, retarders slow the set time of the cement and prolong the pumpability of the cement.

n: The bit can be replaced by wire rope and not need to tripping.

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.

v: to displace the wellbore fluid back to the surface;to displace tubing volume back to the pit.

removing gravel or cement by shifting the packer or opening the sleeve and circulating out of a well by reverse circulating.

n: a well servicing hand who cleans out wellbores.