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US 10,208,559 B2Granted
Diameter-expandable annular degradable seal member for downhole tool, plug for well drilling, and method for well drilling
AssigneeKureha Corporation
InventorsTakeo Takahashi, Masayuki Okura
Life of this patent
Estimating the term…
Abstract
A degradable seal member for downhole tools, the member being a diameter-expandable annular seal member, the diameter-expandable annular seal member comprising: two or more annular members distributed along an axial direction, the annular members being formed from a degradable polymer material having hardness in a range from A60 to D80; a plug for well drilling; and a method for well drilling using the degradable seal member for downhole tools.
Claims20
A degradable seal member for downhole tools, the member being a diameter-expandable annular seal member,
- the diameter-expandable annular seal member comprising:
- three annular members distributed along an axial direction, wherein:
- the annular members being formed from a degradable polymer material having durometer hardness in a range from type A (A60) to type D (D80),
- of the three annular members, a center annular member and two end annular members of the annular members being adjacent along the axial direction, and
- a length of the center annular member in the axial direction being 30 to 70% of a length of the diameter-expandable annular seal member in the axial direction.
2 more elements
Dependencies are inferred from the claim text.