Corrosion Resistant Equipment for Oil and/or Gas Applications
Equipment for oil and/or gas drilling, completion, storage and transportation, including pressure vessels, tools, pipes, tubes, connections and any other parts is coated with highly structured composite material. Due to its highly structured composition it is a particularly effective barrier to protect metals against attack by corrosive substances such as hydrogen sulfide, carbon dioxide and sea water, if necessary under hydrothermal conditions. At the same time it is also abrasion stable, for example against a grinding effect by sand, as well as resistant to the impact of mechanical load e.g. by tools. This is achieved by a coating comprising a binder comprising at least one cross-linked resin, wherein the resin comprises at least one of polar group; at least one type of hydrophilic flakes with an aspect ratio of more than 10, wherein the surface of the flakes at least partially comprises a metal oxide.
1 . Equipment for oil and/or gas drilling, completion, storage and transportation, including pressure vessels, tools, pipes, tubes, connections and any other parts coated with a coating as a barrier against gaseous or liquid corrosive environments, comprising:
a) a cured binder comprising at least one cured cross-linkable resin, wherein the resin comprises at least one polar group; and
b) at least one type of hydrophilic flakes with at least one type of hydrophilic flakes with an aspect ratio of more than 10, wherein the surface of the flakes at least partially comprises a metal oxide.
2 . Equipment according to claim 1 , wherein the metal oxide is a transition metal oxide.
3 . Equipment according to claim 2 , wherein the transition metal oxide is selected from the group consisting of TiO 2 , Fe 2 0 3 , Zr0 2 and mixtures thereof.
4 . Equipment according to claim 1 , wherein the hydrophilic flakes are obtained by a web coating process and then coated by precipitation.
5 . Equipment according to claim 1 , wherein the polar group is a group containing hetero atoms.
6 . Equipment according to claim 5 , wherein the hetero atoms are selected from the group consisting of nitrogen, oxygen, sulfur and phosphorus.
7 . Equipment according to claim 5 , wherein the polar group is selected from the group consisting of hydroxyl, alkoxysilyl, epoxy, carboxyl, ester, carbonyl, oxycarbonyl, sulfide, disulfide, sulfonyl, sulfinyl, thiol, thiocarbonyl, imino, amino, nitrile, ammonium, imide, amide, hydrazo, azo, diazo, cyanide, guanidine, oxygen-containing heterocyclic, nitrogen-containing heterocyclic, and sulfur-containing heterocyclic groups.
8 . Equipment according to claim 1 , wherein the crosslinkable resin is selected from the group consisting of epoxy resins, phenol resins, phenoxy resins and mixtures thereof.
9 . Equipment according to claim 1 , wherein the composition further comprises inorganic particles.
10 . Equipment according to claim 9 , wherein the inorganic particles are hard particles.
11 . Equipment according to claim 10 , wherein the hard particles are selected from the group consisting of at least one of oxides, nitrides, carbides, carbonitrides, silicides and borides.
12 . Equipment according to claim 11 , wherein the hard particles are selected from the group consisting of at least one of boron carbide, silicon carbide and/or silicon nitride.
13 . Equipment according to claim 1 , wherein the coating further comprises a fluorine-containing polymer or oligomer.
14 . Equipment according to claim 1 , wherein the cured binder is further cross-linked by a cross-linking co-monomer, oligomer or polymer.
15 . Equipment according to claim 14 , wherein the cross-linking co-monomer is selected from the group consisting of a co-monomer comprising at least one cyano group, a functionalized perfluoropolyether and/or mixtures therefrom.
16 . Equipment according to claim 14 , wherein the co-monomer comprising at least one cyano group is a compound derived from cyanoguanidines.
17 . Equipment according to claim 1 , wherein the coating comprises 40 to 95 wt.-% of binder.
18 . Equipment according to claim 17 , wherein the binder comprises of a mixture of epoxy resins and phenoxy resins with a ratio 10:1 to 1:1.
19 . (canceled)
20 . A part for oil and/or gas drilling, completion, storage and transportation, comprising pressure vessels, tools, pipes, tubes, or connections having a substrate coated with a coating according to claim 1 .