دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a record of the measurement of porosity, done by comparing depth to the time it takes for a sonic impulse to travel through a given length of formation. The rate of travel of the sound wave through a rock depends on the composition of the formation and the fluids it contains. Because the type of formation can be ascertained by other logs, and because sonic transit time varies with relative amounts of rock and fluid, porosity can usually be determined in this way.

n: A display of traveltime of acoustic waves versus depth in a well. The term is commonly used as a synonym for a sonic log. Some acoustic logs display velocity.

n: 1. the depth in a well at which casing is set, generally the depth at which the casing shoe rests.2. the objective depth in a drilling contract, either a specified depth or the depth at which a specific zone is penetrated. When the depth is reached, the operator makes a decision with respect to running and setting a production string of casing. Under some farm- out and letter agreements, some owners are carried to casing point.

n: The depth of casing shoe in the wellbore.

the depth at which a casing string is set, either by design or because the mud can no longer control the pressure of the next deeper zone without adding weighting agents that would break down upper intervals.

n: A logging device for depth-correlation purposes, operated mechanically or magnetically to produce a log showing the location of each casing, tubing collar, or coupling in a well. It provides an accurate way to measure depth in a well.

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.

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

n: The required drilling depth in drilling contract.

n: The operation which is not included in payment by footage in drilling contract. For example, coring, DST, ES and perforation and the drilling operation which exceeds contractual well depth in the drilling contract.

n: the depth of the wellbore when a new bit or other tool is run in. Compare depth out.

n: The well depth that new bit or tool begins descenting down hole.

n: the depth of the wellbore when a bit or other tool is pulled out of the hole. Compare depth in.

n: The well depth when bringing out drill bit or tool.

n: the depth in the hole at which the tubing, casing, or drill pipe is stuck. See free-point indicator.

n: refer to stuck point.

n: the change in geostatic pressure per unit of depth in the earth.