Category: Crude Oil Treating System

Example Sizing a Vertical Treater

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Given: Oil gravity = 40°API, 0.875 S.G. Oil flow rate = 2,000 bpd Inlet oil temperature = 90°F Water S.G. = 1.04 Inlet BS&W = 10% Outlet BS&W =1% Solution: 1. Settling Equation. Investigate treating at 90°F, 100°F, 120°F. 2. Retention Time. Plot computations of d and h with retention times less than 20 minutes. …

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Example Sizing a Horizontal Treater

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Given: Oil gravity = 30°API, 0.875 S.G. Oil flow rate = 5,000 bpd Inlet oil temperature = 80°F Water S.G. = 1.04 Inlet BS&W =10% Outlet BS&W =1% Solution: 1. Settling Equation. Investigate treating at 80°F, 100°F, 120°F. 2. Retention Time Equation. Plot computations of d and Leff with retention times less than 20 minutes. …

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Treaters Design Procedure

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In specifying the size of a treater, it is necessary to determine the  diameter (d), length or height of the coalescing section (Leff or h), and treating temperature or fire-tube rating. As we have seen, these variables are interdependent, and it is not possible to arrive at a unique solution for each. The design engineer …

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Treaters Water Droplet Size

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In order to develop a treater design procedure, the water droplet size to be used in the settling equation to achieve a given outlet water cut must be determined. As previously mentioned, it would be extremely rare to have laboratory data of the droplet size distribution for a given emulsion as it enters the coalescing …

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Treater Retention Time Equations

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The oil must be held at temperature for a specific period of time to enable de-emulsifying the water-in-oil emulsion. This information is best determined in the laboratory but, in the absence of such data, 20 to 30 minutes is a good starting point. Depending on the specific properties of the stream to be treated, geometry …

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Treater Settling Equations

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The specific gravity difference between the dispersed water droplets and the oil should result in the water “sinking” to the bottom of the treatment vessel. Since the oil continuous phase is flowing vertically upward in both vertical and horizontal treaters previously described, the downward velocity of the water droplet must be sufficient to overcome the …

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Electrostatic Treaters

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Some treaters use an electrode section. Figure 6-11 illustrates a typical design of a horizontal electrostatic treater. The flow path in an electrostatic treater is the same as a horizontal treater. The only difference is that an AC and/or DC electrostatic field is used to promote coalescence of the water droplets. Procedures for designing electrostatic …

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Horizontal Treaters

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For most multi-well situations horizontal treaters are normally required. Figure 6-10 shows a typical design of a horizontal treater. Flow enters the front section of the treater where gas is flashed. The liquid falls around the outside to the vicinity of the oil-water interface where the liquid is “water washed” and the free water is …

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Vertical Treaters

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The most commonly used single-well lease treater is the vertical treater as shown in Figure 6-8. Flow enters the top of the treater into a gas separation section. Care must be exercised to size this section so that it has adequate dimensions to separate the gas from the inlet flow. If the treater is located …

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Electrostatic Coalescers

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Coalescing of the small water drops dispersed in the crude can be accomplished by subjecting the water-in-oil emulsion to a high-voltage electrical field. When a non-conductive liquid (oil) containing a dispersed conductive liquid (water) is subjected to an electrostatic field, the conductive particles or droplets are caused to combine by one of three physical phenomena: …

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