School of Petroleum Engineering
Design Project for Petroleum Engineers
Mass & Energy Balances
Due date: 29/ 8/ 2012
1. Executive summary
3. GOSP diagram
4. Gas Fractionation diagram
5. Three phase separation 6 6. Two phase separation 7 7. Oil water separator 7 8. Dehydration
8 9. Desalting 9 10. Energy Balance Calculations
11. Gas Fractionation Calculations
12. Conclusion 14
The aim of this report is to calculate the amount of the dry oil that can be obtained after processing the wellhead feed. Gas Oil separation Plant is used to achieve this goal. The process involves a three phase separator, two phase separators, gas fractionation, Dehydration and Desalting. At the end of the process, three products are obtained which are gas, dry oil and water. Gas is directed to the Gas Gathering System. Dry oil is sent to the refinery and water is injected back to the ground. Specific Gravity
Remnant water (vol %)
Density of Water(ft³/Ib)
Free water (%)
Associated Gas (wt %)
Water cut (vol %)
Salt Content (ppm)
In this report, mass balance and energy balance calculations are used to determine the amount of gas, dry oil and water. Table1 show the date used to establish the calculations. Table 1 Date used for calculation
These Calculations based on a series of assumptions that were made to obtain reasonable results in each stage. Table 2 shows the final results for Gas, Water and Dry oil. Input
Table 2: the final products from GOSP
To improve the results, we came up with following recommendations: Using HYSIS to confirm the results.
Use another two phase separator to separate the small percentage of oil that remains in the water after water oil separation, dehydration and desalting in order to maximize the recovery of oil.
Petroleum is a complex mixture of organic liquids called crude oil and natural gas. Crude oil varies from oilfield to oilfield in composition, colour and other properties. It is essential to separate gasses, water and other contaminates from it. This is done for safety, economic and environmental reasons. This separation makes the crude oil economically viable for storage, processing and export to meet the specifications set by the customers. As crude oil comes from the well it contains a mixture of hydrocarbon compounds and small quantities of other materials. These materials include oxygen, nitrogen, sulphur, salt and water. Most of these substances are removed and the oil is broken down into various components. This is done in a type of plant used primarily in the oil industry. It is called Gas Oil Separation Plant (GOSP).The products of these plants are then sent for supply and distribution.
Gas Fractionation diagram
We want first to determine the mass flow rates of oil, gas and water in the feed stream. Once that is done mass balance can be done using a number of assumptions. Feed flow rate in m3/day = 580,000 bbl/d * 0.159 m3/bbl = 92 220 m3/d. Total water cut = 0.19 * 92 220 = 17 521.8 m3/d.
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