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US 9,518,442 B2Granted
Easy drill slip with degradable materials
AssigneeBaker Hughes Incorporated
InventorsRichard Yingqing Xu, Zhiyue Xu
Life of this patent
Estimating the term…
Abstract
Slip elements for a downhole tool include an inner body portion that is substantially formed of a material that is degradable by dissolution in response to a dissolving fluid and a hardened, resilient, radially outer contact portion. The inner body portion may be formed of magnesium, aluminum or iron based powder.
Claims23
A slip element comprising:
- an inner body portion that is formed of a dissolvable material that is dissolvable in response to a dissolving agent;
- and
- an outer contact portion in contact with the inner body portion and being formed of a material suitable to provide engaging contact with a tubular member near the outer contact portion and that is not dissolvable by the dissolving agent or dissolvable at a slower dissolution rate relative to the dissolvable material.
A downhole tool having a gripping system for resisting axial or torsional movement within a flowbore of a surrounding tubular, the gripping system comprising:
- a setting cone;
- a slip element that is selectively radially moveable with respect to the setting cone between unset and set positions, the slip element comprising:
- an inner body portion formed of a dissolvable material that is dissolvable in response to a dissolving agent;
- and
- an outer contact portion in contact with the inner body portion and being formed of a material suitable to provide engaging contact with a tubular member near the outer contact portion and that is not dissolvable by the dissolving agent or dissolvable at a slower dissolution rate relative to the dissolvable material.
2 more elements
A method of releasing a downhole tool that is set within a flowbore from the flowbore, comprising the steps of:
- a) providing a set downhole tool having:
- a setting cone;
- a slip element that is selectively radially moveable with respect to the setting cone between unset and set positions, the slip element comprising:
- an inner body portion formed of a dissolvable material that is dissolvable in response to a dissolving agent;
- an outer contact portion in contact with the inner body portion and being formed of a material suitable to provide engaging contact with a tubular member near the outer contact portion, the material forming the outer contact portion being not dissolvable by the dissolving agent or dissolvable at a slower dissolution rate relative to the dissolvable material;
- and
- b) flowing a dissolving agent within the flowbore to dissolve the inner body portion.
4 more elements
Dependencies are inferred from the claim text.