دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: variation of barite. See barite.

n: a record showing variations in wellbore diameter by depth, indicating undue enlargement due to caving in, washout, or other causes. The caliper log also reveals corrosion, scaling, or pitting inside tubular goods.

n: A tool run on wireline that measures the diameter of the wellbore. It may be used for detecting washouts, calculating cement volumes, or detecting internal corrosion of casing.

a recording of the diameter changes in a well made by a tool with mechanical arms that touch the wellbore or a sonic signal bouncing off the borehole wall.

n: a variation of squeeze cementing for wells with two producing zones in which (1) the upper fluid sand is perforated;(2) tubing is run with a packer, and the packer is set between the two perforated intervals;(3) water is circulated between the two zones to remove as much mud as possible from the channel;(4) cement is pumped through the channel and circulated;(5) the packer is released and picked up above the upper perforation, a low squeeze pressure is applied, and the excess cement is circulated out. The process is applicable where there is communication behind the pipe between the two producing zones because of channelling of the primary cement or where there is essentially no cement in the annulus.

a secondary or repair cement method using upper and lower perforations and a packer set between. Circulation is established with water and mud remover chemicals to clean the channel. Cement is circulated with a set volume pumped, then the packer is releas

mouth of river deposits, usually fan shaped with significant variation in composition, sorting and thickness. Quality of the reservoir rock may vary widely.

n: a special radioactivity log for open-hole surveying that responds to variations in the specific gravity of formations. It is a contact log (i.e., the logging tool is held against the wall of the hole). It emits neutrons and then measures the secondary gamma radiation that is scattered back to the detector in the instrument. The density log is an excellent porosity-measure device, especially for shaley sands. Some trade names are Formation Density Log, Gamma- Gamma Density Log, and Densilog.

one of a number of logging techniques that estimate the density of the formation.

n: 1. the difference in quantity or degree between two measurements or units. For example, the pressure differential across a choke is the variation between the pressure on one side and that on the other. 2. the value or volume payment accompanying an exchange of oil for oil. The payment serves as compensation for quality, location, or gravity differences between the oils being exchanged.

n: the extent of variation between the lowest and highest differential pressures that an orifice meter can accurately measure.

n: Schlumberger wireline tool that records shear, compressional and stoneley waveforms. Used for amplitude variation with offset (AVO) calibration, shear seismic correlation, wellbore stability measurements, sanding analysis, fracture height estimation and s

n: 1. an instrument or assembly of instruments used to measure torque and other force-related properties of rotating or reciprocating machinery. 2. in sucker rod pumping, a device used to indicate a variation in load on the polished rod as the rod string reciprocates. A continuous record of the result of forces acting along the axis of the polished rod is provided on a dynamometer card, from which an analysis is made of the performance of the well pumping equipment.

a recording of the stresses in a rod string of a beam pumping unit.

n, v: variation of gauge. Until recently the API preferred gage" to "gauge."