دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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: the location of the bottom of a string of casing that is cemented in a well. Typically, a casing shoe is made up on the end of the casing at this point.

n: The position of the bottom of casing string after cementing.

the set point of the end of casing. Should be in an impermeable, stable formation.

n: a procedure whereby the formation immediately below the casing shoe is subjected to a pressure equal to the pressure expected to be exerted later by the drilling fluid or by the drilling fluid and the back-pressure created by a kick. See leakoff test.

a LOT or an FIT test (check specifics for details),a pressurized test after primary cementing to make sure the bottom most seal with the formation will handle pressures needed for drilling the rest of the well.

n: see guide shoe. casing slip n: see spider.

n: A short section of steel filled with concrete and rounded at the bottom. This is installed on the bottom of the casing string to guide the casing past any ledges or irregularities in the borehole. Sometimes called a guide shoe.

a tapered guid shoe on the bottom of a casing string to assist in passing ledges and dog-legs in the wellbore.

a pressure test of the casing seal, after the cement job, to the pressures necessary to safely control the pressure of the deeper zones.

n: See cementing shoe.

n: See diamond-set casing shoe.

n: See diamond-set casing shoe.

n: The casing shoe hollow bit whose surface is installed with natural diamond.

n: a kind of casing shoe with cataclinal side openings around the bottom of the float valve