Threaded end of a tubular component for drilling or working hydrocarbon wells, and resulting connection
View Patent ↗A threaded end ( 1; 2 ) of a tubular component for drilling or working hydrocarbon wells, said end comprising a threaded zone ( 3; 4 ) produced on its external or internal peripheral surface depending on whether the threaded end is male or female in type, at least a portion of the end ( 1; 2 ) being coated with a dry film comprising an organic matrix in which ion exchange pigments are dispersed in proportions in the range 3% to 30% by weight; and a connection resulting from connecting two corresponding ends by makeup.
1. A threaded end of a steel tubular component suitable for drilling or working hydrocarbon wells, said threaded end comprising a threaded zone on an external or internal peripheral surface of the threaded end depending on whether the threaded end is male or female,
wherein at least a portion of the threaded end is coated with a dry film comprising an organic matrix in which 10% to 15% by weight of calcium ion exchange amorphous silica pigments are dispersed,
wherein the organic matrix is a thermoplastic matrix comprising a thermoplastic selected from the group consisting of a polyethylene wax, a copolyamide based on an acid dimer, an esterified colophane, and a terpene resin.
2. The threaded end of claim 1 , wherein the organic matrix has a shear strength under contact pressures of at least 500 MPa and a torque on shoulder resistance value which is greater than or equal to a torque on shoulder resistance value obtained for a grease conforming to API standard RP 5A3.
3. The threaded end of claim 1 , wherein the organic matrix comprises a polyethylene wax.
4. The threaded end of claim 1 , wherein the organic matrix comprises a copolyamide resin.
5. The threaded end of claim 1 , wherein the portion of the threaded end is pre-treated by a surface preparation selected from the group consisting of a sanding, a conversion treatment and an electrolytic deposition, before coating with the dry film.
6. The threaded end of claim 1 , wherein the organic matrix further comprises particles of solid lubricants.
7. The threaded end of claim 1 , wherein the organic matrix further comprises corrosion inhibitors.
8. The threaded end of claim 1 , wherein the threaded zone is at least partially coated with dry film.
9. The threaded end of claim 1 , further comprising a metal/metal sealing surface, said sealing surface being coated with dry film.
10. A threaded tubular connection, comprising a male threaded end and a female threaded end of a tubular component connected one into the other, wherein at least one of the threaded ends is the threaded end of claim 1 .
11. The threaded tubular connection of claim 10 , wherein the portion of the threaded end coated with the dry film exists on the female threaded end.
12. A steel tubular component having a threaded end suitable for drilling or working hydrocarbon wells, said threaded end comprising a threaded zone on an external or internal peripheral surface of the threaded end depending on whether the threaded end is male or female,
wherein at least a portion of the threaded end is coated with a dry film comprising an organic matrix in which 10% to 15% by weight of calcium ion exchange amorphous silica pigments are dispersed, and
wherein the organic matrix is a thermoplastic matrix comprising a thermoplastic selected from the group consisting of a polyethylene wax, a copolyamide based on an acid dimer, an esterified colophane, and a terpene resin.
13. The steel tubular component of claim 12 , wherein the calcium ion exchange amorphous silica has a particle size not exceeding 20 μm.
14. The steel tubular component of claim 12 , wherein the organic matrix also contains at least one nanometric pigment.
15. The steel tubular component of claim 14 , wherein the nanometric pigment is nanometric alumina.
16. The steel tubular component of claim 15 , wherein the calcium ion exchange amorphous silica has a particle size not exceeding 20 μm.
17. The threaded end of claim 1 , wherein the calcium ion exchange amorphous silica has a particle size not exceeding 20 μm.
18. The threaded end of claim 1 , wherein the organic matrix also contains at least one nanometric pigment.
19. The threaded end of claim 18 , wherein the nanometric pigment is nanometric alumina.