Degradable downhole tools and components
Degradable downhole tools, tool components, and balls are formed from a polyvinyl alcohol (PVA) compound. The PVA compound exhibits strength and elasticity properties that are comparable to existing degradable downhole polymers and further exhibits degradability properties that are superior to existing degradable downhole polymers. For different components, the PVA compound may include a reinforcing material such as fiberglass. Usage of tools, tool components, and balls formed from the disclosed materials eliminates the requirement that such equipment be drilled out after use as the PVA compound quickly degrades in standard downhole fluids.
1. A tool, comprising:
a body having an axial bore extending therethrough;
one or more slips arranged about the body and configured to extend radially to engage an interior wall of a wellbore conduit; and
a sealing member configured to form a seal between an outer surface of the body and the interior wall of the wellbore conduit,
wherein at least a portion of the body is formed from a first polyvinyl alcohol (PVA) compound that comprises a fiberglass reinforcing material, and wherein
the sealing member comprises a second PVA compound that does not comprise a fiberglass reinforcing material.
2. The tool of claim 1 , wherein the one or more slips are formed from a third PVA compound and includes one or more pockets configured to accept a gripping material, wherein the third PVA compound is the same or different than the first PVA compound.
3. The tool of claim 2 , wherein the gripping material is a metal or ceramic material.
4. The tool of claim 1 , wherein the first PVA compound comprises between 5 and 60% fiberglass by weight.
5. The tool of claim 4 , wherein the PVA compound comprises a long fiber reinforced PVA compound.
6. The tool of claim 1 , wherein the second PVA compound is more flexible than the first PVA compound.
7. The tool of claim 6 , wherein the second PVA compound comprises a polyol plasticizer.
8. The tool of claim 6 , wherein the second PVA compound comprises a PVA component that is partially hydrolyzed.
9. The tool of claim 1 , wherein the body comprises a seat configured to accept a ball to block fluid passage through the axial bore in a downhole direction.
10. The tool of claim 1 , wherein the body comprises a first portion formed from the first PVA compound and a second portion formed from a different material.
11. The tool of claim 10 , wherein the first portion comprises a cylindrical extrusion having external threads that are configured to engage internal threads in the second portion.
12. The tool of claim 1 , wherein the first PVA compound comprises a blend polymer.
13. The tool of claim 12 , wherein the blend polymer is polycaprolactam.
14. The tool of claim 13 , wherein the PVA compound comprises between 1 and 25% polycaprolactam by weight.
15. The tool of claim 1 , wherein the first PVA compound comprises a colorant.
16. The tool of claim 1 , wherein the first PVA compound comprises degradable metal powder blended therein.