IP Library › Granted Patent US 9,580,971
Granted Patent B2
US 9,580,971 · App. 14/799,301 · Granted Feb 28, 2017

Coated apparatus for improved corrosion resistance and associated system and method for artificial lift

Inventor: Larry Lance McNease (Lake Charles, LA)
Assignee: BCM Production, LLC
E21B17/00B32B15/011B32B15/012B32B15/013B32B15/015C22C18/04E21B43/121
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Quick Facts
Patent No.
US 9,580,971
App. No.
14/799,301
Granted
Feb 28, 2017
Kind
B2
Abstract

Embodiments provide a coated apparatus for improved corrosion resistance and associated system and system and method for artificial lift.

Claims (44)

1. A sucker rod system for associating with a production tubing within a production casing of a hydrocarbon production well and having a high corrosion resistance for use in extending the life of a production tubing string and extending time between well work overs for a late life hydrocarbon production well, the well having a high radical concentration fluid environment, the sucker rod system comprising:

a plurality of solid sucker rod anodes for positioning within the production tubing for protecting the interior wall of the production tubing from electrochemical corrosion, each of the plurality of solid sucker rod anodes comprising

a carbon steel core having an outer surface extending from a first end to a second end, the outer surface comprising: carbon steel disposed to contact fluid in the hydrocarbon production well, and further comprising an anode coating adjacent the outer surface of the carbon steel core and molded onto said each of the plurality solid sucker rod anodes, ; and

a plurality of anode coatings molded around selected portions of the production tubing for protecting the exterior wall of the production tubing and the interior of the production casing from electrochemical corrosion, each of said plurality of anode coatings molded around selected portions of the production tubing for contacting the hydrocarbon production well fluid;

anode coating on said solid sucker rod anodes and anode coatings molded around selected portions of the production tubing formed of a composition comprising zinc in a proportion of at least 99.414% by weight for protecting said production tubing and said production casing from H2S, aluminium in a proportion of 0.1% to 0.5% by weight for protecting said production tubing and said production casing from chlorine and salt, and cadmium in a proportion of 0.025% to 0.070% by weight for protecting said production tubing and said production casing from CO2 corrosion, thereby extending the life of the production tubing and production casing in a later life hydrocarbon production well by reducing the electrochemical corrosion from H2S, chlorine and salt, and CO2.

2. The apparatus of claim 1 , wherein said sucker rod system comprises a carbon steel core further comprising a width ranging from ⅞inches and ¾inches in width.

3. The apparatus of claim 1 , wherein said sucker rod system comprises an anode coating further comprising an outer diameter between 1.625 inches and 2 inches in width.

4. The apparatus of claim 1 , wherein said anode coating further comprises not more than 99.414% by weight of zinc.

5. The apparatus of claim 1 , wherein said anode coating further comprises not more than 0.006% by weight of lead.

6. The apparatus of claim 1 , wherein said anode coating further comprises not more than 0.005% by weight of iron.

7. The apparatus of claim 1 , wherein said anode coating further comprises not more than 0.005% by weight of copper.

8. The apparatus of claim 1 , wherein said carbon steel core is sand blasted and galvanized prior to being coated.

9. A well for the production of hydrocarbons wherein a sucker rod system associates with production tubing within a production casing of a hydrocarbon production well and having a high corrosion resistance for use in extending the life of a production tubing string and extending time between well work overs for a late life hydrocarbon production well, the well having a high radical concentration fluid environment, comprising:

a well casing comprising an interior surface and an exterior surface;

a well tubing comprising an interior surface and an exterior surface, wherein at least a portion of the exterior surface of the well tubing comprises a well tubing coating comprising zinc, aluminum, and cadmium;

the sucker rod system comprising:

a plurality of solid sucker rod anodes for positioning within the production tubing for protecting the interior wall of the production tubing from electrochemical corrosion, and comprising a carbon steel core having an outer surface extending from a first end to a second end, the outer surface comprising carbon steel disposed to contact the fluid in the hydrocarbon production well, and further comprising an anode coating adjacent the outer surface of the carbon steel core and molded onto said solid sucker rod anode, ; and

a plurality of anode coatings molded around selected portions of the production tubing for protecting the exterior wall of the production tubing and the interior of the production casing from electrochemical corrosion, each of said plurality of anode coatings molded around selected portions of the production tubing for contacting the hydrocarbon production well fluid;

said the anode coating on said solid sucker rod anodes and anode coatings molded around selected portions of the production tubing formed of a composition comprising zinc in a proportion of at least 99.414% by weight for protecting said production tubing and said production casing from H2S, aluminium in a proportion of 0.1% to 0.5% by weight for protecting said production tubing and said production casing from chlorine and salt, and cadmium in a proportion of 0.025% to 0.070% by weight for protecting said production tubing and said production casing from CO2 corrosion, thereby extending the life of the production tubing and production casing in a later life hydrocarbon production well by reducing the electrochemical corrosion from H2S, chlorine and salt, and CO2.

10. The well of claim 9 , wherein said sucker rod system comprises a carbon steel core comprising a diameter ranging between ⅞inches and ¾inches in width.

11. The well of claim 9 , wherein said sucker rod system comprises an anode coating further comprising an outer diameter between 1.625 inches and 2 inches in width.

12. The well of claim 9 , wherein said anode coating further comprising not more than 99.414% by weight of zinc.

13. The well of claim 9 , wherein said anode coating further comprising 0.1 to 0.5% by weight of aluminum.

14. The well of claim 9 , wherein said anode coating further comprising not more than 0.006% by weight of lead.

15. The well of claim 9 , wherein said anode coating further comprising not more than 0.005% by weight of iron.

16. The well of claim 9 , wherein said anode coating further comprising not more than 0.005% by weight of copper.

17. The well of claim 9 , wherein said anode coating further comprising 0.025 to 0.07% by weight of cadmium.

18. The well of claim 9 , wherein said carbon steel core is sand blasted and galvanized prior to being coated.

19. A system for artificial lift within a hydrocarbon production well, and wherein a sucker rod system associates with production tubing within a production casing of a hydrocarbon production well and demonstrates a high corrosion resistance for use in extending the life of a production tubing string and extending time between well work overs for a late life hydrocarbon production well, the system for artificial lift comprising:

a production casing comprising an interior surface and an exterior surface;

a production tubing comprising an interior surface and an exterior surface;

a sucker rod system comprising:

a plurality of solid sucker rod anodes for positioning within the production tubing for protecting the interior wall of the production tubing from electrochemical corrosion, and comprising a carbon steel core having an outer surface extending from a first end to a second end, the outer surface comprising carbon steel disposed to contact the fluid in the hydrocarbon production well, and further comprising an anode coating adjacent the outer surface of the carbon steel core and molded onto said solid sucker rod anode, ; and

a plurality of anode coatings molded around selected portions of the production tubing for protecting the exterior wall of the production tubing and the interior of the production casing from electrochemical corrosion, each of said plurality of anode coatings molded around selected portions of the production tubing for contacting the hydrocarbon production well fluid;

said the anode coating on said solid sucker rod anodes and anode coatings molded around selected portions of the production tubing formed of a composition comprising zinc in a proportion of at least 99.414% by weight for protecting said production tubing and said production casing from H2S, aluminium in a proportion of 0.1% to 0.5% by weight for protecting said production tubing and said production casing from chlorine and salt, and cadmium in a proportion of 0.025% to 0.070% by weight for protecting said production tubing and said production casing from CO 2 corrosion, thereby extending the life of the production tubing and production casing in a later life hydrocarbon production well by reducing the electrochemical corrosion from H 2 S, chlorine and salt, and CO 2 .

20. A method for artificial lift comprising supporting in a well casing the following:

a well tubing comprising an interior surface and an exterior surface; and

a sucker rod system for associating with a production tubing within a production casing of a hydrocarbon production well and having a high corrosion resistance for use in extending the life of a production tubing string and extending time between well work overs for a late life hydrocarbon production well, the well having a high radical concentration fluid environment, the sucker rod system comprising:

a plurality of solid sucker rod anodes for positioning within the production tubing for protecting the interior wall of the production tubing from electrochemical corrosion, and comprising a carbon steel core having an outer surface extending from a first end to a second end, the outer surface comprising carbon steel disposed to contact the fluid in the hydrocarbon production well, and further comprising an anode coating adjacent the outer surface of the carbon steel core and molded onto said solid sucker rod anode, ; and

a plurality of anode coatings molded around selected portions of the production tubing for protecting the exterior wall of the production tubing and the interior of the production casing from electrochemical corrosion, each of said plurality of anode coatings molded around selected portions of the production tubing for contacting the hydrocarbon production well fluid;

said the anode coating on said solid sucker rod anodes and anode coatings molded around selected portions of the production tubing formed of a composition comprising zinc in a proportion of at least 99.414% by weight for protecting said production tubing and said production casing from H 2 S, aluminium in a proportion of 0.1% to 0.5% by weight for protecting said production tubing and said production casing from chlorine and salt, and cadmium in a proportion of 0.025% to 0.070% by weight for protecting said production tubing and said production casing from CO2 corrosion, thereby extending the life of the production tubing and production casing in a later life hydrocarbon production well by reducing the electrochemical corrosion from H 2 S, chlorine and salt, and CO 2 ;

and

powering the pump jack so as to actuate the sucker rod system and allow the displacement of underground fluid,

wherein the well tubing coating on the well tubing and the anode coating on the sucker rod system protect the sucker rod system, the interior surface of the tubing, the exterior surface of the tubing, and the interior surface of the casing from electrochemical corrosion during the displacement of the underground fluid.

Continuity (1)
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