Methods and systems for optimizing demulsifier and wash water injection rates in gas oil separation plants
AssigneeSaudi Arabian Oil Company
InventorsSamusideen Adewale Salu, Mohamed A. Soliman, Talal A. Zahrani
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Abstract
Control strategy and algorithms to be utilized in a programmable logic control for automating injection rates of demulsifier and wash-water in a Gas-Oil-Separation Plant (GOSP). The logic control system can be programmed on a Distributed Control System (DCS) of the plant. The automating system is developed with the objective of optimizing demulsifier and wash water usage, improving plants water removal efficiency and minimizing process upsets from insufficient injection of demulsifier or wash water.
Claims15
A system for optimizing demulsifier injection rate in a GOSP (Gas-Oil-Separation Plant) including a control unit, the system comprising:
- a programmable logic controller operatively coupled to the control unit associated with the plant;
- and
- a non-transitory computer-readable medium in communication with the programmable logic controller and having stored thereon a set of instructions that when executed cause the programmable logic controller to perform operations comprising:
- reading a demulsifier dosage rate for a crude inlet to the plant;
- reading a wet crude flow rate for the crude inlet to the plant;
- reading a first primary demulsifier injection rate for the crude inlet to the plant;
- reading a current value of basic sediment and water (BS&W) at either a desalter outlet or an export crude outlet of the plant;
- determining the current value of BS&W is not within a first predetermined range;
- determining a second primary demulsifier injection rate based on the first primary demulsifier injection rate, the demulsifier dosage rate, and the wet crude flow rate;
- and
- causing to modify a demulsifier injection pump stroke to inject the demulsifier at the second primary demulsifier injection rate.
A method for optimizing demulsifier injection rate in a GOSP (Gas-Oil-Separation Plant), the method comprising:
- reading, by a programmable logic controller coupled to a control unit associated with the plant, a demulsifier dosage rate for a crude inlet to the plant;
- reading a wet crude flow rate for the crude inlet to the plant;
- reading a first primary demulsifier injection rate for the crude inlet to the plant;
- reading a current value of basic sediment and water (BS&W) at either a desalter outlet or an export crude outlet of the plant;
- determining the current value of BS&W is not within a first predetermined range;
- determining a second primary demulsifier injection rate based on the first primary demulsifier injection rate, the demulsifier dosage rate, and the wet crude flow rate;
- and
- causing to modify a demulsifier injection pump stroke to inject the demulsifier at the second primary demulsifier injection rate.
Dependencies are inferred from the claim text.