# Category: Crude Oil Treating System

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. […]

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. […]

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 […]

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 […]

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 […]

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 […]

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 […]