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: 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.

n: The ratio between minimal clearance of casing ectooecium and borehole wall and different of wellbore radius and casing external radius.

n: in a wellbore, the space between the inside of the casing and the outside of the tubing.

n: the theory that the earths landforms assumed their present configuration in a brief episode at the beginning of geologic history-possibly in a single great catastrophic event-and have remained relatively unchanged since that time. Compare uniformtarianism. catcher n: a device fitted into a junk basket that retains the junk picked up by the basket catch samples v: to obtain cuttings for geological information as formations are penetrated by the bit The samples are obtained from drilling fluid as it emerges from the wellbore or, in cable-tool drilling, from the bailer. Cuttings are carefully washed until they are free of foreign matter, dried, and labelled to indicate the depth at which they were obtained.

n: Obtaining of samples by the drilling crew from the drilling fluid as it emerges from the wellbore. Cuttings so obtained should be carefully washed until free of foreign matter, dried and accurately labelled with the depth at which they were drilled for ev

n: the collapse of the walls of the wellbore.

n: A severe form of sloughing (See also Sloughing).

n: collapsing of the walls of the wellbore. Also called sloughing.

n: Collapse of the walls of the borehole. Also referred to as sloughing.

n pi: particles that fall off (are sloughed from) the wall of the wellbore. Compare cuttings.

n: The block dropping into the wellbore due to fluctuation of borehole face.

loose formation materials that falls into the wellbore.

rock fragments that spall or break off the wellbore walls. Usually found as fill in the hole.