دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. see conductor casing.2. a boot, or flume.

n: A short string of large-diameter casing set to support the surface formations. The conductor pipe is typically set soon after drilling has commenced since the unconsolidated shallow formations can quickly wash out or cave in. Where loose surface soil exis

the first string of casing run, usually to keep rocks or dirt out of the wellbore. It is usually not cemented in place. It may be jetted in, driven in, drilled in or installed in an excavated hole.

n: the relatively small amount of gas enters a well when the mud pump is stopped for a connection to be made. Since bottomhole pressure decreases when the pump is stopped, gas may enter the well.

the small amount of gas that enters the wellbore when circulation is stopped to make a connection. The gas only enters the wellbore in this case when the static fluid pressure is less than the pore pressure.

n: The method of equiping slurry that make sure the density of cement slurry is the same at any depth in the wellbore by equiping cement slurry with different ratio of gas and slurry.

placing a material in a cement slurry (usually already in a wellbore) that purposely prevents the cement form setting so that it can be circulated out of the wellbore.

n: A kind of cementing method in deep well. The cement slurry is pumped into the wellbore continually by two-step.

n: the depth of the wellbore at which a drilling contract is fulfilled.

n: The required drilling depth in drilling contract.

n: The method that blasting when the liquid head is lower than the pressure of contributing zone by decreasing liquid head in the wellbore.

n: an electric log in which current flow in the logging tool was dispersed through the mud in the wellbore prior to entering the formation. As a result, formation resistivity measurements were often inaccurate. These logs are no longer used.

n: A kind of tool for fishing core dropping into the wellbore.

n: 1. a small portion of a formation obtained by using a core bit in an existing wellbore. See core bit. 2. a spot sample of the contents of an oil or oil product storage tank usually obtained with a thief, or core sampler, at a given height in the tank.

n: The rock sample whose diameter is from 50mm to 100mm ,acquired from bottom hole when core drilling.