Process for coating a threaded tubular component, threaded tubular component and resulting connection

Patent metadata

Field	Value
Publication number	US-9599273-B2
Application number	US-201113977238-A
Country	US
Kind code	B2
Filing date	Dec 12, 2011
Priority date	Dec 29, 2010
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The invention concerns a threaded tubular component for drilling or working hydrocarbon wells, said tubular component having at one of its ends ( 1; 2 ) a threaded zone ( 3; 4 ) produced on its outer or inner peripheral surface depending on whether the threaded end is male or female in type, in which at least a portion of the end ( 1; 2 ) is coated with at least one film of polyurethane ( 12 ), 100 % solid state, with an essentially rigid structure, based on a matrix of polyurethane and polyurea, in which the urethane functionality is predominant with respect to the urea functionality in a proportion of at least 55 % by weight.

First claim

The invention claimed is:

1. A threaded tubular component, comprising at one of its ends a threaded zone arranged on an outer or inner peripheral surface depending on whether the threaded zone is a male or female end,
wherein at least a portion of the male or the female end is coated with at least one dry film having a Shore D hardness of more than 50 and comprising a mono-component matrix of polyurethane and polyurea; and
a proportion of urethane functionality in the mono-component matrix of polyurethane and polyurea is at least 55% by weight with respect to urea functionality;
wherein the mono-component matrix of polyurethane and polyurea is obtained from a polyol monomer with a molecular mass in the range 300 to 6000 g/mol, a chain extension agent and free aromatic isocyanates which are optionally cured by polyaddition with moisture, and
wherein the mono-component matrix of polyurethane and polyurea comprises:
a multifunctional isocyanate pre-polymer with a functionality of at least 2, prepared from a mixture of a polyether, a polybutadiene or hydroxylated polyester polyols with a molecular mass in the range 300 to 6000 g/mol and aromatic isocyanates of diphenylmethane diisocyanate, in excess;
a co-reagent of a mono- or bis-oxazolidone to initiate reaction and dilute the pre-polymer;
an aliphatic polyisocyanate curing agent of hexamethylene diisocyanate to maintain curing;
a catalyst for the pre-polymer of dimorpholinodiethyl ether or dibutyl tin laurate;
a plasticizer to control foaming during formation of the dry film; and
a moisture scavenger to stabilize the pre-polymer during storage by capturing residual water, said moisture scavenger being p-toluene sulphonyl isocyanate, trimethyl orthoformate or trimethyl orthoacetate.

2. A threaded tubular component, comprising at one of its ends a threaded zone arranged on an outer or inner peripheral surface depending on whether the threaded zone is a male or female end,
wherein at least a portion of the male or the female end is coated with at least one dry film having a Shore D hardness of more than 50 and comprising a mono-component matrix of polyurethane and polyurea; and
a proportion of urethane functionality in the mono-component matrix of polyurethane and polyurea is at least 55% by weight with respect to urea functionality;
wherein the mono-component matrix of polyurethane and polyurea is obtained from a polyol monomer with a molecular mass in the range 300 to 6000 g/mol, a chain extension agent and free aromatic isocyanates which are optionally cured by polyaddition with moisture, and
wherein the mono-component matrix of polyurethane and polyurea comprises:
a multifunctional isocyanate pre-polymer with a functionality of at least 2, prepared from a mixture of a polyether, a polybutadiene or hydroxylated polyester polyols with a molecular mass in the range 300 to 6000 g/mol and aromatic isocyanates of diphenylmethane diisocyanate, in excess;
a co-reagent of a mono- or bis-oxazolidone to initiate reaction and dilute the pre-polymer;
an aliphatic polyisocyanate curing agent of hexamethylene diisocyanate to maintain curing;
a catalyst for the pre-polymer of dimorpholinodiethyl ether or dibutyl tin laurate;
a plasticizer to control foaming during formation of the dry film, and
a CO 2 scavenger of calcium oxide or magnesium oxide to control foaming and formation of bubbles during the reaction.

3. A threaded tubular component, comprising at one of its ends a threaded zone arranged on an outer or inner peripheral surface depending on whether the threaded zone is a male or female end,
wherein at least a portion of the male or the female end is coated with at least one dry film having a Shore D hardness of more than 50 and comprising a polyurethane and polyurea matrix;
a proportion of urethane functionality in the polyurethane and polyurea matrix is at least 55% by weight with respect to urea functionality, and
the polyurethane and polyurea matrix comprises at least one class 1, 2, 3 or 4 solid lubricant as a friction reducing agent, in a proportion by weight in the range 5% to 30%.

4. The threaded tubular component according to claim 3 , wherein the at least one class 1, 2, 3 or 4 solid lubricant is selected from the group consisting of:
a solid lubricant from class 2 of the Bi 2 S 3 type;
a solid lubricant from class 4 of the PTFE type; and
a combination thereof.

5. A threaded tubular component comprising at one of its ends a threaded zone arranged on an outer or inner peripheral surface depending on whether the threaded zone is a male or female end,
wherein at least a portion of the male or the female end is coated with at least one dry film having a Shore D hardness of more than 50 and comprising a polyurethane and polyurea matrix;
a proportion of urethane functionality in the matrix is at least 55% by weight with respect to urea functionality, and
the polyurethane and polyurea matrix comprises a corrosion inhibitor.

6. The threaded tubular component according to claim 1 , wherein the threaded zone is entirely coated with the dry film.

7. The threaded tubular component according to claim 1 , further comprising a metal/metal sealing surface coated with the dry film.

8. A threaded tubular connection, comprising a male threaded tubular component and a female threaded tubular component arranged one into the other,
wherein at least one of said threaded tubular components is the threated tubular component of claim 1 .

9. A method for coating the threaded tubular component of claim 1 for drilling or working hydrocarbon wells, the method comprising:
applying the polyurethane and polyurea matrix in a liquid state to the threaded zone located at one end of the threaded tubular component by spraying over a portion of the end; and
curing the mono-component matrix of polyurethane and polyurea to form the dry film with an essentially rigid structure.

10. The method according to claim 9 , wherein the curing is initiated by applying a relative humidity of at least 60% RH at a temperature of at least 20° C., optionally followed by drying.

11. The method according to claim 10 , wherein the curing comprises drying in an infrared or convection drying oven supplied with water vapour.

12. The method according to claim 9 , wherein the curing occurs with a bi-component spraying device including external mixing of a hardener.

13. The method according to claim 12 , wherein the curing is followed by a stoving or post-curing operation at a temperature of 90° C.

14. The threaded tubular component according to claim 2 , wherein the threaded zone is entirely coated with the dry film.

15. The threaded tubular component according to claim 2 , comprising a metal/metal sealing surface coated with the dry film.

16. A threaded tubular connection, comprising a male threaded tubular component and a female threaded tubular component arranged one into the other,
wherein at least one of said threaded tubular components is the threated tubular component of claim 2 .

17. The threaded tubular component according to claim 3 , wherein the threaded zone is entirely coated with the dry film.

18. The threaded tubular component according to claim 3 , comprising a metal/metal sealing surface coated with the dry film.

19. A threaded tubular connection, comprising a male threaded tubular component and a female threaded tubular component arranged one into the other,
wherein at least one of said threaded tubular components is the threated tubular component of claim 3 .

20.

Assignees

• Pinel Eliette
• Gard Eric
• Petit Mikael
• Gouider Mohamed
• Vallourec Oil & Gas France
• Nippon Steel & Sumitomo Metal Corp

Inventors

• Pinel Eliette
• Gard Eric
• Petit Mikael
• Gouider Mohamed

Classifications

• C10N2050/02

  dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating · CPC title

• C10N2080/00

  Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2050/08

  Solids · CPC title

• C08G2150/90

  Compositions for anticorrosive coatings · CPC title