Patent ID: 11946332
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Materials, metallurgy (Chemistry)
Classification: CPC E  C | IPC C  E

Claim 14:
15. A downhole swellable packer system comprising:
a conveyance;
a mandrel coupled with the conveyance;
a sealing element disposed about a least a portion of the mandrel, the sealing element formed of a material responsive to exposure to a trigger fluid in a wellbore to radially expand from the mandrel; and
a degradable metal coating disposed about at least a portion of an outer surface of the sealing element, the degradable metal coating fluidly isolating the portion of an outer surface of the sealing element from an exterior of the coating, wherein the degradable metal coating comprises a doped magnesium alloy selected from the group consisting of:
a doped WE magnesium alloy comprising 86.6% to 90.6% magnesium, about 4% rare earth metal yttrium, about 4% rare earth metal that is not yttrium, 1% to about 5% dopant from the group consisting of iron, nickel, copper, and any combination thereof, and selected about 0.4% supplemental material of zirconium, each by weight of the doped WE magnesium alloy;
a doped AZ magnesium alloy comprising about 88.5% magnesium, about 9% aluminum, about 0.7% zinc, 1% to about 5% dopant selected from the group consisting of iron, nickel, copper, and any combination thereof, about 0.2% supplemental material of manganese, and about 0.3% supplemental material of zinc, each by weight of the doped AZ magnesium alloy;
a doped AZ magnesium alloy comprising about 94.5% magnesium, about 3% aluminum, about I % zinc, I % to about 5% dopant selected from the group consisting of iron, nickel, copper and any combination thereof, and about 0.3% supplemental material of manganese, each by weight of the doped AZ magnesium alloy;
a doped ZK magnesium alloy comprising about 91.7% magnesium, about 5.9% zinc, about 0.2% zirconium, and about 2% dopant selected from the group consisting of copper, nickel, iron, and any combination thereof, each by weight of the doped ZK magnesium alloy;
a doped ZK magnesium alloy comprising about 89.9% magnesium, about 3.2% zinc, about 0.6% zirconium, and about 6.3% dopant selected from the group consisting of copper, nickel, iron, and any combination thereof, each by weight of the doped ZK magnesium alloy; and
a doped AM magnesium alloy comprising about 91.4% magnesium, about 6% aluminum, about 0.2% manganese, about 2% dopant selected from the group consisting of copper, nickel, iron, and any combination thereof, about 0.2% supplemental material of silicon, and about 0.2% supplemental material of zinc, each by weight of the doped AM magnesium alloy;
wherein the degradable metal coating is selectively removable from the mandrel downhole so as to expose the sealing element to the trigger fluid in the wellbore.