Degradable downhole tools comprising magnesium alloys

Patent metadata

Field	Value
Publication number	US-9702029-B2
Application number	US-201514783479-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Aug 28, 2014
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Downhole tools having at least one component made of a doped magnesium alloy solid solution that at least partially degrades in the presence of an electrolyte, wherein the doped magnesium alloy is selected from the group consisting of a doped MG magnesium alloy, a doped WE magnesium alloy, a doped AZ magnesium alloy, a doped ZK magnesium alloy, a doped AM magnesium alloy, and any combination thereof.

First claim

What is claimed is:

1. A downhole tool comprising:
at least one component of the downhole tool made of a doped magnesium alloy solid solution formed from a single melt that at least partially degrades in the presence of an electrolyte,
wherein the doped magnesium alloy is 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 comprises about 94.5% magnesium, about 3% aluminum, about 1% zinc, 1% 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.

2. The downhole tool of claim 1 , wherein the doped magnesium alloy is selected from the group consisting of the doped AZ magnesium alloy and the doped ZK magnesium alloy.

3. The downhole tool of claim 1 , wherein the doped magnesium alloy is selected from the group consisting of the doped WE magnesium alloy, the doped AZ magnesium alloy, the doped ZK magnesium alloy, the doped AM magnesium alloy, and any combination thereof, and further comprises a supplemental material present in an amount of less than about 10% by weight of the doped magnesium alloy.

4. The downhole tool of claim 1 , wherein the doped magnesium alloy is selected from the group consisting of the doped WE magnesium alloy, the doped AZ magnesium alloy, the doped ZK magnesium alloy, the doped AM magnesium alloy, and any combination thereof, and comprises 0.5% to 5% dopant.

5. The downhole tool of claim 1 , wherein the rare earth metal in the doped WE magnesium alloy that is not yttrium is selected from the group consisting of scandium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and any combination thereof.

6. The downhole tool of claim 1 , wherein the downhole tool is selected from the group consisting of a wellbore isolation device, a completion tool, a drill tool, a testing tool, a slickline tool, a wireline tool, an autonomous tool, a tubing conveyed perforating tool, and any combination thereof.

7. The downhole tool of claim 1 , wherein the downhole tool is a wellbore isolation device, the wellbore isolation device being a frac plug or a frac ball.

8. The downhole tool of claim 1 , wherein the at least one component is selected from the group consisting of a mandrel of a packer or plug, a spacer ring, a slip, a wedge, a retainer ring, an extrusion limiter or backup shoe, a mule shoe, a ball, a flapper, a ball seat, a sleeve, a perforation gun housing, a cement dart, a wiper dart, a sealing element, a wedge, a slip block, a logging tool, a housing, a release mechanism, a pumpdown tool, an inflow control device plug, an autonomous inflow control device plug, a coupling, a connector, a support, an enclosure, a cage, a slip body, a tapered shoe, and any combination thereof.

9. A method comprising:
introducing a downhole tool comprising at least one component made of a doped magnesium alloy solid solution formed from a single melt into a subterranean formation;
performing a downhole operation; and
degrading at least a portion of the doped magnesium alloy solid solution in the subterranean formation by contacting the doped magnesium alloy solid solution with an electrolyte, wherein the doped magnesium alloy is 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 selected from the group consisting of iron, nickel, copper, and any combination thereof, and 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 comprises about 94.5% magnesium, about 3% aluminum, about 1% zinc, 1% 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.

10. The method of claim 9 , wherein the electrolyte is selected from the group consisting of an introduced electrolyte into the subterranean formation, a produced electrolyte by the subterranean formation, and any combination thereof.

11. The method of claim 9 , wherein the downhole operation is selected from the group consisting of a stimulation operation, an acidizing operation, an acid-fracturing operation, a sand control operation, a fracturing operation, a frac-packing operation, a remedial operation, a perforating operation, a near-wellbore consolidation operation, a drilling operation, a completion operation, and any combination thereof.

12. The method of claim 9 , wherein the downhole tool is selected from the group consisting of a wellbore isolation device, a completion tool, a drill tool, a testing tool, a slickline tool, a wireline tool, an autonomous tool, a tubing convey

Assignees

• Halliburton Energy Services Inc

Inventors

• Fripp Michael Linley
• Walton Zachary William

Classifications

• C22C23/04

  with zinc or cadmium as the next major constituent · CPC title

• E21B23/01

  for anchoring the tools or the like (E21B23/02 - E21B23/06 take precedence; anchoring of drives in the borehole E21B4/18) · CPC title

• C22C23/02 Primary

  with aluminium as the next major constituent · CPC title

• E21B33/134

  Bridging plugs · CPC title

• E21B43/25

  Methods for stimulating production {(by vibrating earth formations E21B43/003)} · CPC title