دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a length of casing that runs from a set point to a point part way up in the previously set casing string, but usually not to surface. A liner may be used instead of a full casing string to save money, to maintain a larger ID for well equipment or to preve

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: the entire length of all the joints of casing run in a well. Most casing joints are manufactured to specifications established by API, although non-API specification casing is available for special situations. Casing manufactured to API specifications is available in three length ranges. A joint of range 1 casing is 16 to 25 feet (4.8 to 7.6 metres) long;a joint of range 2 casing is 25 to 34 feet (7.6 to 10.3 metres) long;and a joint of range 3 casing is 34 to 48 feet (10.3 to 14.6 metres) long. The out- side diameter of a joint of API casing ranges from 4Yz to 20 inches (11.43 to 50.8 centimetres).

n: The entire length of all the casing joints run into the borehole. Several different sizes of casing string may be required.

a continuous string of casing, usually cemented over at least part of its length and usually extending back to surface from the set point.

v: to install casing so that it is supported in the casinghead by slips.

installing casing to the casing set point.

a polished nipple is run below blast joints to allow a pack-off set point when by-passing a damaged joint.

n: 1. an automatic valve that opens or closes when an abnormal condition occurs (e.g., a pressure relief valve on a separator that opens if the pressure exceeds the set point, or the shutdown valve at the wellhead that closes if the line pressure becomes too high or too low). 2. a valve installed at the top of the drill stem to prevent flow out of the drill pipe if a kick occurs during tripping operations.

various. Generally used in describing a surface or subsurface safety valve.

n: the depth of the bottom of the casing when it is set in the well.