Oil well gas lift by hydrogen production through produced water electrolysis completion

Patent metadata

Field	Value
Publication number	US-9458704-B2
Application number	US-201414337398-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Jul 26, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A method of using an electrochemical gas lift apparatus to induce artificial gas lift in a production fluid includes introducing the electrochemical gas lift apparatus into a well bore having a production zone, operating the electrochemical gas lift apparatus such that a combination of hydrocarbon fluid and formation water is introduced into the interior of the electrochemical gas lift apparatus, introducing electrical power to the electrochemical gas lift apparatus such that at least a portion of formation water in the interior of the electrochemical gas lift apparatus converts into product gases, operating the electrochemical gas lift apparatus such that the product gases form product gas bubbles in the interior of the electrochemical gas lift apparatus, and operating the electrochemical gas lift apparatus such that production fluid forms in the interior of the electrochemical gas lift apparatus. The production fluid comprises hydrocarbon fluid, unconverted formation water and product gas bubbles.

First claim

What is claimed is:

1. A method of using an electrochemical gas lift apparatus to induce artificial gas lift in a production fluid, the method comprising the steps of:
introducing the electrochemical gas lift apparatus into a well bore such that the electrochemical gas lift apparatus is located in the production zone of the well bore, where the well bore is defined by a well bore wall and traverses the hydrocarbon-bearing formation, where the production zone contains a well bore fluid and where the well bore fluid comprises a hydrocarbon fluid and a formation water, and wherein the electrochemical gas lift apparatus includes an anode, a cathode and an interior wall, where the interior wall defines an interior that contains both the anode and the cathode;
operating the electrochemical gas lift apparatus such that the well bore fluid is introduced into the interior of the electrochemical gas lift apparatus;
introducing electrical power to the electrochemical gas lift apparatus such that a portion of the formation water in the well bore fluid in the interior of the electrochemical gas lift apparatus is converted into a product gas, where the product gas includes hydrogen gas and oxygen gas; and
operating the electrochemical gas lift apparatus such that the product gas forms product gas bubbles and the production fluid forms, where the production fluid comprises hydrocarbon fluid, unconverted formation water and product gas bubbles, and where the product gas bubbles induce artificial gas lift in the production fluid.

2. The method of claim 1 where introduction of the electrochemical gas lift apparatus further comprises isolating a portion of the production zone fluidly from a remainder of the well bore.

3. The method of claim 1 where the electrochemical gas lift apparatus is part of a completion string and the product gas bubbles induce artificial gas lift in the production fluid within the completion string.

4. A method of using an electrochemical gas lift system to produce electrical power from a production fluid comprising the steps of:
introducing the electrochemical gas lift apparatus into a well bore such that the electrochemical gas lift apparatus is located in the production zone of the well bore, where the well bore is defined by a well bore wall and traverses the hydrocarbon-bearing formation, where the production zone contains a well bore fluid and where the well bore fluid comprises a hydrocarbon fluid and a formation water;
operating the electrochemical gas lift apparatus such that the well bore fluid is introduced into an interior of the electrochemical gas lift apparatus;
introducing electrical power to the electrochemical gas lift apparatus such that a portion of the formation water in the well bore fluid in the interior of the electrochemical gas lift apparatus is converted into a product gas, where the product gas include hydrogen gas and oxygen gas; and
operating the electrochemical gas lift apparatus such that the product gas forms product gas bubbles and the production fluid forms, where the production fluid comprises hydrocarbon fluid, unconverted formation water and product gas bubbles, and where the product gas bubbles induce artificial gas lift in the production fluid;
operating the electrochemical gas lift system such that the production fluid is produced and is introduced into a separation system, a reactive gas is selectively separated from the production fluid in the separation system and is introduced into an electrical generation system, electrical power is produced from the reactive gas in the electrical generation system and at least a portion of the produced electrical power is introduced to the electrochemical gas lift apparatus;
where the electrochemical gas lift apparatus, the separation system and the electrical generation system couple and are in fluid communication with each other, and
where the electrochemical gas lift apparatus and the electrical generation system are in electrical communication with one another.

5. The method of claim 4 where the reactive gas is selected from the group consisting of hydrogen, oxygen, methane, ethane, propane, butanes, pentanes, hexanes, carbon monoxide, carbon dioxide, hydrogen sulfide and combinations thereof.

6. The method of claim 4 where the electrical generation system includes a solid oxide fuel cell and the reactive gas comprise hydrogen, oxygen, methane, ethane, propane, butanes, pentanes, hexanes, carbon monoxide and carbon dioxide.

7. A completion string that is operable to provide artificial lift to a production fluid from a production zone to a surface within the completion string, the completion string comprising:
an internal fluid conduit within the completion string that is operable to convey the production fluid from the production zone to the surface, and
an electrochemical gas lift apparatus, where the electrochemical gas lift apparatus:
comprising an anode, a cathode and an interior wall, where the interior wall defines an interior that contains both the anode and the cathode and that is operable as part of the internal fluid conduit of the completion string to convey production fluid;
that is operable to selectively permit the introduction of a well bore fluid from the production zone into the interior, where the well bore fluid comprises a hydrocarbon fluid and a formation water; and
that is operable to convert the formation water at the anode and the cathode using electrical power into product gas, to convert product gas into product gas bubbles, and to convert the introduced well bore fluid into production fluid, where the production fluid comprises hydrocarbon fluid, unconverted formation water and product gas bubbles, such that the production fluid is artificially lifted.

8. The completion string of claim 7 where the anode and the cathode are located upstring of an inlet flow control valve that is operable to selectively permit introduction of the well bore fluid from the production zone.

9. The completion string of claim 7 where the interior wall includes an electrically resistant coating.

10. The completion string of claim 7 where the electrochemical gas lift apparatus further comprises an ion exchange membrane in the interior that separates fluid between the anode and the cathode.

11. The completion string of claim 10 where the ion exchange membrane is a cation exchange membrane.

12. The completion string of claim 7 where the electrochemical gas lift apparatus further comprises a sensor that is operable to detect a condition and to transmit a signal associated with the detected condition.

13. The completion string of claim 12 where the detectable condition is a presence of the formation water in the well bore fluid.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Mulhem Abdulrahman Abdulaziz
• Noui-Mehidi Mohamed Nabil

Classifications

• E21B43/121 Primary

  Lifting well fluids (monitoring of down-hole pump systems E21B47/008) · CPC title

• E21B43/122 Primary

  Gas lift · CPC title