System and method for incorporating a velocity spool (ejector) in a corrosion inhibition system

Patent metadata

Field	Value
Publication number	US-11761309-B2
Application number	US-202016998575-A
Country	US
Kind code	B2
Filing date	Aug 20, 2020
Priority date	Aug 20, 2020
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present disclosure describes a wellhead system that includes a wellhead; a tank of corrosion inhibitor chemical; and an ejector device comprising: a high pressure nozzle connected to the wellhead through a first flowline; a low pressure nozzle connected to the tank of corrosion inhibitor chemical through a second flowline; and wherein the ejector device is configured to generate a gas and chemical mixture fluid that exits the ejector device and flows downstream of the wellhead system.

First claim

What is claimed is:

1. A wellhead system, comprising:
a wellhead;
a tank of corrosion inhibitor chemical; and
an ejector device configured as a stationary installation without a rotating component that includes a reciprocating pump,
the ejector device comprising:
a high pressure nozzle connected to the wellhead through a first flowline;
a low pressure nozzle connected to the tank of the corrosion inhibitor chemical through a second flowline; and
wherein the ejector device is configured to generate a gas and chemical mixture fluid that, when exiting the ejector device, flows away from the wellhead and downstream of the wellhead system.

2. The wellhead system of claim 1 , wherein the ejector device further comprises:
a converging nozzle distal to the high pressure nozzle and the low pressure nozzle, wherein the converging nozzle is configured to convert a pressure of fluid from the first flowline to create a low pressure zone that provides a motive gas to entrain fluid from the second flowline such that the gas and chemical mixture fluid is created.

3. The wellhead system of claim 2 , wherein the fluid from the second flowline contains sufficient dose of a corrosion inhibitor chemical to protect pipelines downstream of the wellhead system from corrosion.

4. The wellhead system of claim 2 , wherein the converging nozzle is configured to increase a fluid velocity of the fluid from the first flowline such that a high static pressure of the fluid from the first flowline is transformed into a velocity pressure that results in the low pressure zone.

5. The wellhead system of claim 2 , wherein the ejector device further comprises a diffuser section located distal to the converging nozzle.

6. The wellhead system of claim 5 , wherein the diffuser section comprises a diverging nozzle configured to reduce a velocity of the gas and chemical mixture fluid and increase a pressure of the gas and chemical mixture fluid such that the gas and chemical mixture fluid is re-compressed before exiting the ejector device.

7. The wellhead system of claim 6 , wherein the gas and chemical mixture fluid exits the ejector device to reach facilities downstream of the wellhead system.

8. The wellhead system of claim 1 , wherein the tank of corrosion inhibitor chemical comprises a restriction orifice (RO).

9. The wellhead system of claim 8 , wherein the restriction orifice is configured to restrict a dosage of the corrosion inhibitor chemical being released at the ejector device.

10. The wellhead system of claim 8 , wherein the restriction orifice is configured to avoid an over-dosage of the corrosion inhibitor chemical being released at the ejector device.

11. The wellhead system of claim 1 , further comprising:
a pressure choke valve connected to the wellhead through a third flowline.

12. The wellhead system of claim 11 , wherein the pressure choke valve is configured to drop a pressure of fluid from the third flowline.

13. The wellhead system of claim 11 , wherein the ejector device is located upstream of the pressure choke valve.

14. The wellhead system of claim 1 , further comprising:
a communication device configured to communicate data encoding a measured concentration of the corrosion inhibitor chemical in the gas and chemical mixture fluid.

15. A computer-implemented method, comprising:
accessing data encoding a measurement of a concentration of a corrosion inhibitor chemical in a mixture fluid exiting a wellhead system; and
controlling a dose of the corrosion inhibitor chemical being released at an ejector device of the wellhead system such that the concentration of the corrosion inhibitor chemical in the mixture fluid exiting the wellhead system is within a pre-determined range, wherein the ejector device is configured to generate the mixture fluid that, when exiting the ejector device, flows away from a wellhead of the wellhead system and downstream of the wellhead system.

16. The computer-implemented method of claim 15 , further comprising
in response to the concentration being lower than a pre-determined threshold level, enlarging an opening of a restriction orifice (RO) at a tank of the corrosion inhibitor chemical such that a quantity of the corrosion inhibitor chemical being released at the ejector device of the wellhead system is increased.

17. The computer-implemented method of claim 15 , further comprising
in response to the concentration being higher than a pre-determined threshold level, reducing an opening of a restriction orifice (RO) at a tank of the corrosion inhibitor chemical such that a quantity of the corrosion inhibitor chemical being released at the ejector device of the wellhead system is decreased.

18. The computer-implemented method of claim 15 , further comprising:
applying renewable energy to power at least one piece of active equipment of the wellhead system, wherein the renewable energy is harvested onsite at the wellhead system.

19. The computer-implemented method of claim 15 , further comprising:
monitoring the concentration of the corrosion inhibitor chemical in the mixture fluid exiting the wellhead system.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alsayed Khaled Ali
• Alsadhan Saud F

Classifications

• E21B41/02 Primary

  in situ inhibition of corrosion in boreholes or wells · CPC title

• B05B7/262

  a liquid and a gas being brought together before entering the discharge device · CPC title

• E21B41/0078

  Nozzles used in boreholes (drilling by liquid or gas jets E21B7/18; drill bits with nozzles E21B10/60; perforators using direct fluid action E21B43/114; obtaining a slurry of minerals using nozzles E21B43/29) · CPC title