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n: a large, sloping sedimentary deposit at the mouth of a canyon, laid down by intermittently flowing water, especially in arid climates, and composed of gravel and sand. The deposit tends to be coarse and unworked, with angular, poorly sorted grains in thin, overlapping sheets. A line of fans may eventually coalesce into an apron that grows broader and higher as the slopes above are eroded away.
land counterpart of a river delta. Characteristic of sediments that have been transported by a fast moving stream then dropped out of the flow as the stream velocity drops as it spreads out. Typical of zones of heavy water runoff such as found at the base
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abbr: a trademark name for an annular pressure-responsive valve for a DST string.
annular pressure relief valve. Used in reverse circulating to prevent pipe collapse.
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n: I. the fore and aft reference line at the upper surface of the flat plate keel at the centre line for flush shell plate vessels. 2. the thickness of the garboard strake above that level for vessels having lap seam shell plating.
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n: The diameter of the drilled wellbore. The borehole diameter can change greatly even the same bit due to the change of formation lithology and formation collapse.
n: The tripping jamming due to borehole wall collapsing, low-performance drilling fluid or cuttings accumulating.
n: The wellbore which is blocked by collapsed formation, cutting, or low-performance drilling fluid.
a device used to reround slightly collapsed tubulars.
n: the amount of pressure that, when applied inside a string of casing, causes the wall of the casing to fail. This pressure is critically important when a gas kick is being circulated out, because gas on the way to the surface expands and exerts more pressure than it exerted at the bottom of the well.
n: The pressure leading to collapsing of the casing.
n: The phenomenon that casing is collapsed or damaged because the difference of external pressure and internal pressure is more than collapsing strength of casing.
