Use of PEKK for producing parts with low gas permeability
The use of PEKK for lowering the CO 2 and H 2 S permeability of a part intended to enter into contact with a petroleum effluent. Also, a pipe for transporting a petroleum effluent, including a layer intended to be in contact with the petroleum effluent, wherein the layer intended to be in contact with the petroleum effluent comprises PEKK and has a CO 2 permeability at 130° C. of less than 10 −8 cm 3 , for a thickness of 1 cm and a surface area of 1 cm 2 and per second and bar of CO 2 pressure and/or an H 2 S permeability at 130° C. of less than 10 −8 cm 3 for a thickness of 1 cm and a surface area of 1 cm 2 and per second and bar of H 2 S pressure, the amount of CO 2 and H 2 S being measured by GC, respectively. Lastly, a number of methods for manufacturing such a pipe.
1. A method for lowering the CO 2 and H 2 S permeability of a part intended to be in contact with a petroleum effluent, the method comprising using PEKK for the part, wherein the PEKK has a degree of crystallinity by mass of greater than 5%.
2. A method for lowering the CO 2 and H 2 S permeability of a part intended to be in contact with a petroleum effluent, the method comprising using PEKK for the part, wherein the PEKK has a ratio T:I of 35% to 100%.
3. A method for lowering the CO 2 and H 2 S permeability of a part intended to be in contact with a petroleum effluent, the method comprising using PEKK for the part, wherein the CO 2 permeability at 130° C. is less than 10·10 −9 cm 3 of CO 2 for a thickness of 1 cm and a surface area of 1 cm 2 , per second and per bar of CO 2 pressure, and/or an H 2 S permeability at 130° C. is less than 10 −8 cm 3 for a thickness of 1 cm and a surface area of 1 cm 2 , per second and per bar of H 2 S pressure, the amount of CO 2 and H 2 S being measured by GC, respectively.
4. The method as claimed in claim 1 , wherein the part is selected from a tube, a sheath, a pressure layer and an interior coating.
5. A pipe for transporting a petroleum effluent, comprising a layer intended to be in contact with the petroleum effluent, wherein said layer intended to be in contact with the petroleum effluent comprises PEKK and has a CO 2 permeability at 130° C. of less than 10·10 −8 cm 3 of CO 2 for a thickness of 1 cm and a surface area of 1 cm 2 , per second and per bar of CO 2 pressure, and/or an H 2 S permeability at 130° C. of less than 10 −8 cm 3 for a thickness of 1 cm and a surface area of 1 cm 2 , per second and per bar of H 2 S pressure, the amount of CO 2 and H 2 S being measured by GC, respectively.
6. The pipe as claimed in claim 5 , wherein said layer intended to be in contact with the petroleum effluent is a sealing sheath surrounding a metal carcass.
7. The pipe as claimed in claim 5 , wherein said layer intended to be in contact with the petroleum effluent is devoid of reinforcing fibers.
8. The pipe as claimed in claim 5 , wherein said layer intended to be in contact with the petroleum effluent is surrounded by at least one mechanical reinforcement layer.
9. The pipe as claimed in claim 8 , wherein the at least one mechanical reinforcement layer is made of metal.
10. The pipe as claimed in claim 8 , wherein the at least one mechanical reinforcement layer is made of composite material.
11. The pipe as claimed in claim 10 , wherein the composite material comprises PEKK and carbon fibers.
12. The pipe as claimed in claim 5 , further comprising a rigid metal armature.
13. The pipe as claimed in claim 5 , further comprising a flexible metal armature.
14. A method for manufacturing or renovating a pipe as claimed in claim 12 , comprising the steps of:
a. preparing a tube comprising PEKK of appropriate size; and
b. inserting said tube inside a metal tube to form a liner.
15. A method for manufacturing a pipe as claimed in claim 13 , comprising the steps of:
a. providing a metal carcass;
b. extruding around said metal carcass at least one layer of a composition comprising PEKK, by crosshead extrusion; and
c. installing a vault around the resulting structure;
d. installing one or more tensile armor plies; and
e. extruding an external polymer sheath around the resulting assembly.
16. A method for manufacturing a pipe as claimed in claim 13 , the method comprising the steps of:
a. extruding at least one layer of a composition comprising PEKK by crosshead extrusion; and
b. installing a vault around the resulting structure;
c. installing one or more tensile armor plies; and
d. extruding an external polymer sheath around the resulting assembly.
17. The method as claimed in claim 2 , wherein the part is selected from a tube, a sheath, a pressure layer and an interior coating.
18. The method as claimed in claim 3 , wherein the part is selected from a tube, a sheath, a pressure layer and an interior coating.