دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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

an elongated lens of sand formed during distribution of sediment in a delta.

n: the part of a marine delta that lies farthest from shore. It consists of silt and clay extending well out from the toe of the steep delta face. Such beds grow slowly, out of reach of most of the effects of river current and wave action.

n: see lacustrine delta. marine delta.

n: The formation water which is released by cuttings changes the resistance and chloride content of drilling fluid because the salinity of formation is different with drilling fluid. Drawing curve of the chloride increment with well depth. It can be a method

n: three-wire connection used in three-phase circuits, resembling the Greek letter delta (A). Used alone or in various combinations with wye connections.

n: A method of examining overflowing or leakage in the wellbore. Acquiring difference of circulating rate by computing the difference of delivery capacity and return flow of pump with electro magnetic current meter.

n: See deltaflow method.

the sonic travel time in microseconds per foot, of a sound wave through the formation. Denser formations (generally better consolidated and cemented) have lower (faster) delta t times.

n: The difference of bit load measured by weight indicator in drill floor and bit load measured by MWD.