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US 2016/0237774 A1Published application
Plug for well drilling
AssigneeKureha Corporation
InventorsMASAYUKI OKURA, TAKEO TAKAHASHI
Life of this patent
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Abstract
A plug for well drilling comprising a mandrel and members attached on an outer circumferential surface orthogonal to an axial direction of the mandrel. In such a plug for well drilling, at least the mandrel or one of the members is formed from a degradable material and a curvature radius of a bent portion thereof is from 0.5 to 50 mm. Additionally, a well drilling method using the plug for well drilling, the method comprising degrading a part or all of the plug for well drilling after blocking a borehole.
Claims22
A plug for well drilling comprising:
- a mandrel and members attached on an outer circumferential surface orthogonal to an axial direction of the mandrel;
- at least the mandrel or one of the members being formed from a degradable material;
- and a curvature radius of a bent portion thereof being from 0.5 to 50 mm.
A plug for well drilling comprising:
- a mandrel and members attached on an outer circumferential surface orthogonal to an axial direction of the mandrel;
- at least the mandrel or one of the members being formed from a degradable material;
- and a curvature radius of a bent portion thereof being from 0.5 to 50 mm, wherein one of the members is the pair of ring-shaped fixing members formed from the degradable material;
- and the one of the pair of ring-shaped fixing members is integrally formed with the mandrel and is fixed in a state disenabling sliding in the axial direction of the mandrel.
1 more element
Dependencies are inferred from the claim text.