Simplified logic injection control (SLIC) for demulsifier chemical automation

Patent metadata

Field	Value
Publication number	US-11092935-B2
Application number	US-201816052163-A
Country	US
Kind code	B2
Filing date	Aug 1, 2018
Priority date	Aug 1, 2018
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Systems and techniques for demulsifier automation of the wet crude handling facilities can include a computer-implemented method. Demulsifier automation parameters for automating demulsifier injection points of a wet crude handling facility are determined. The determining includes performing a data convolution and a smoothening of inlet demulsifier automation parameters. Performing the demulsifier automation of the wet crude handling facility, includes, for each demulsifier, the following: A current state of the demulsifier is identified based on the demulsifier automation parameters. Demulsifier calculation input parameters are determined, including performing a convolution and a smoothening of the demulsifier calculation input parameters. A demulsifier dosage rate is calculated using the determined demulsifier calculation input parameters. A state dependent dosage multiplication factor is applied to the demulsifier based on the current state based on the calculated demulsifier dosage rate.

First claim

What is claimed is:

1. A computer-implemented method, comprising:
determining demulsifier automation parameters for automating demulsifier injection points of a wet crude handling facility, the determining including performing a data convolution and a smoothening of inlet demulsifier automation parameters; and
performing the demulsifier automation of the wet crude handling facility, including, for each demulsifier:
identifying a current state of the demulsifier, the identifying based on the demulsifier automation parameters;
determining demulsifier calculation input parameters, including performing a convolution and a smoothening of the demulsifier calculation input parameters;
calculating, using the determined demulsifier calculation input parameters, a demulsifier dosage rate;
applying, to the demulsifier and based on the current state, a state dependent dosage multiplication factor based on the calculated demulsifier dosage rate.

2. The computer-implemented method of claim 1 , wherein states of the demulsifier include a normal state, an abnormal state, and a transit state.

3. The computer-implemented method of claim 2 , further comprising performing a state transition from the current state to a new state based on the current state and a determination that a boundary condition has been breached or, when the current state is the transit state, has become normalized.

4. The computer-implemented method of claim 3 , wherein state transitions are state-dependent and include:
a state transition from the normal state to the abnormal state when the boundary condition is breached;
a state transition from the transit state to the abnormal state when the boundary condition is breached;
a state transition from the abnormal state to the transit state when the boundary condition is normalized; and
a state transition from the transit state to the normal state when the boundary condition and the transit setpoint are normal.

5. The computer-implemented method of claim 4 , wherein, when the current state is the abnormal state, transitioning to the normal state cannot occur without first transitioning to the transit state.

6. The computer-implemented method of claim 1 , wherein the input parameters include a crude temperature and a gas-oil separator plant (GOSP) total liquid flowrate.

7. The computer-implemented method of claim 6 , wherein the GOSP total liquid flowrate is a sum of a net crude export rate and a net water injection rate.

8. The computer-implemented method of claim 3 , wherein the boundary conditions include threshold values for a temperature, a dehydrator voltage, a desalter voltage, a dehydrator water outlet flow, and a basic sediment and water (BS&W) at a desalter outlet.

Assignees

• Saudi Arabian Oil Co

Inventors

• Syed Khuzzan Syed Haizir
• Teuling Marnix Jan
• Franklin Randall L

Classifications

• C10G31/08

  by treating with water · CPC title

• C10G33/08

  Controlling or regulating · CPC title

• B01D17/12

  Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits · CPC title

• B01D17/047 Primary

  with separation aids · CPC title

• C10G2300/205

  Metal content · CPC title