Category: Production Process Component

Lease Automatic Custudy Transfer

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Lease Automatic Custudy Transfer

In large facilities oil is typically sold through a LACT unit, which is designed to meet API Standards and whatever additional measuring and sampling standards are required by the crude purchaser. The value received for the crude will typically depend on its gravity, BS+W content, and volume. Therefore, the LACT unit must not only measure […]

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Oil Treating Process

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Oil Treating Process

Most oil treating on offshore facilities is done in vertical or horizontal treaters, such as those described in “Crude Oil Treating System“. Figure 2-8 is an enlargement of the oil treater in Flow Sheet. In this case, a gas blanket is provided to assure that there is always enough pressure in the treater so the […]

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Process Separator Operating Pressure

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Process Separator Operating Pressure

The choice of separator operating pressures in a multistage system is large. For large facilities many options should be investigated before a final choice is made. For facilities handling less than 50,000 bpd, there are practical constraints that help limit the options. A minimum pressure for the lowest pressure stage would be in the 25 […]

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Stages Separation Selection

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Stages Separation Selection

As more stages are added to the process there is less and less incremental liquid recovery. The diminishing income for adding a stage must more than offset the cost of the additional separator, piping, controls, space, and compressor complexities. It is clear that for each facility there is an optimum number of stages. In most […]

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Separation Stages

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Separation Stages

Figure 2-5 deals with a simple single-stage process. That is, the fluids are flashed in an initial separator and then the liquids from that separator are flashed again at the stock tank. Traditionally, the stock tank is not normally considered a separate stage of separation, though it most assuredly is. Figure 2-6 shows a three-stage […]

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Separator Initial Pressure

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Separator Initial Pressure

Because of the multicomponent nature of the produced fluid, the higher the pressure at which the initial separation occurs, the more liquid will be obtained in the separator. This liquid contains some light components that vaporize in the stock tank downstream of the separator. If the pressure for initial separation is too high, too many […]

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Separation Flow Control

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It is very rare that flow must be controlled in an oil field process. Normally, the control of pressure, level, and temperature is sufficient. Occasionally, it is necessary to assure that flow is split in some controlled manner between two process components in parallel, or perhaps to maintain a certain critical flow through a component. […]

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Separation Temperature Control

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The way in which the process temperature is controlled varies. In a heater, a temperature controller measures the process temperature and signals a fuel valve to either let more or less fuel to the burner. In a heat exchanger the temperature controller could signal a valve to allow more or less of the heating or […]

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Separator Level Control

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It is also necessary to control the gas/liquid interface or the oil/water interface in process equipment. This is done with a level controller and liquid dump valve. The most common form of level controller is a float, although electronic sensing devices can also be used. If the level begins to rise, the controller signals the […]

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