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Definitions for a selection of terms related to Watercut, BS&W, OWD

  • Definitions for a selection of terms related to Watercut, BS&W, OWD

Definitions for a selection of terms related to Watercut, BS&W, OWD


flow proportional water measurement

The flow weighted average water content over a fixed time period or batch volume determined from the OWD measurement and the liquid flow rate through the pipe during the time or batch period.

flow weighted average (FWA)

The average of a variable weighted by the flow rate or incremental volume. It can be the average of the variable values sampled at uniform volume intervals, or it can be the average of variable values sampled at uniform time intervals and weighted by the incremental volume that occurred during that time interval.

footprint verification

A number, a set of numbers, a table, an equation or a curve representing the raw measurement (usually a frequency) of the meter, with a specific, uniquely defined content in the sensor section. The footprint should be recorded as part of factory calibration, so that it can later be used as a reference during a reproducibility check to verify that the meter has not changed its response.

measurement location

Point where the OWD measures the water content of the petroleum stream.

on-line water measurement device (OWD)

A real-time measuring device that uses electronics to detect and calculate water concentrations in petroleum and petroleum products.

OWD system

An OWD system may be comprised of one or more OWD’s, stream conditioning, other measurement devices (e.g., temperature, pressure, density, flow, etc.), and a computer to assimilate, compile, and report the data.

The OWD system can be full bore, insertion device installed in main line or within an analyzer loop.

pacing

The method of proportioning the measurement interval.

range

The maximum and minimum values attainable from a measurement device. When applied to an OWD, the units will be percent water in oil by volume (e.g., 0-5% or 0-100%). Units of percent water in oil by mass are also allowed if the OWD is suitably calibrated.

dissolved water

Water in solution in petroleum and petroleum products.

emulsion

An oil / water mixture that does not readily separate.

entrained water

Water suspended in oil. Entrained water includes emulsions but does not include dissolved water.

free water

Water that exists in a separate phase.

homogenous

When a liquid composition is the same at all points in the container, tank, or pipeline cross section.

representative sample

A portion extracted from a total volume that contains the constituents in the same proportions that are present in that total volume.

sample

A portion extracted from a total volume that may or may not contain the constituents in the same proportions that are present in that total volume.

static mixer

A device that utilizes the kinetic energy of the flowing stream to achieve stream conditioning.

sample loop, analyzer loop, fast loop, slipstream

A low volume stream diverted from the main pipeline which may be dedicated to analyzers, a sampling system or part of a power mixing loop.

stream condition

The distribution and dispersion of the pipeline contents, upstream on the sampling location.

stream conditioning

The mixing of a flowing stream so that a representative sample may be extracted.