Protective coating for a substrate
AssigneeBaker Hughes Incorporated
InventorsZhiyue Xu, Deepak Kumar
Life of this patent
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Abstract
A coating having a gradient composite structure, applied to a substrate, which may be a disposable tool. The gradient composite comprises a bonding component and an erosion and/or corrosion resistant component. When applied to a disposable tool, such as a ball and seat assembly in a downhole environment, the coating enhances the performance of disintegrable materials used in such tools. The coating may be configured to expire at the end of a selected duration, allowing the underlying material to disintegrate.
Claims24
A coating for a transitory substrate having a transitory property defined by a selected rate of disintegration, comprising:
- a composite structure having a bonding component and one of an erosion resistant component and a corrosion resistant component, the composite structure having a proximal layer and a distal layer, the proximal layer being attached to the transitory substrate having the transitory property defined by the selected rate of disintegration, the proximal layer having a greater concentration of the bonding component when compared with the distal layer.
A disposable tool, comprising:
- a transitory substrate having a transitory property defined by a selected rate of disintegration;
- and
- a coating disposed on an outer surface of the transitory substrate, the coating comprising a gradient composite structure, having a bonding component with a greater concentration at a proximal layer, and
- a composite structure having a bonding component and one of an erosion resistant component and a corrosion resistant component, the composite structure having a proximal layer and a distal layer, the proximal layer being attached to the transitory substrate having the transitory property defined by the selected rate of disintegration, the composite structure having a ratio of the bonding component to the erosion or corrosion resistant component at the proximal layer that is greater than a ratio of the bonding component to the erosion or corrosion-resistant component at the distal layer.
An apparatus for restricting flow through a well conduit, comprising:
- a housing having a longitudinal bore and a seat disposed within the bore;
- and
- a plug member configured to be disposed into the bore and landed on the seat to restrict fluid flow through the bore, wherein at least one of the seat and the plug member being formed of a transitory material having a transitory property defined by a selected rate of disintegration and having a protective coating applied thereon, wherein the protective coating comprises a gradient composite structure having a bonding component and an erosion or corrosion resistant component, the gradient composite structure comprises a proximal layer being attached to the at least one of the seat and the plug member, the proximal layer having a greater concentration of the bonding component when compared with a distal layer of the gradient composite structure.
A seat assembly located in a well bore, comprising a seat element having a substrate formed at least partially from a transitory material having a transitory property defined by a selected rate of disintegration and disposed in a well bore, the seat element being configured to receive a plug element, the seat element and the plug element restricting flow through the well bore when the plug is received by the seat element, wherein the disintegrable material includes an outer layer comprising a gradient composite material formed at least partially from a bonding material provided in a greater concentration at an inner surface attached to the substrate than at an outer surface of the outer layer.
Dependencies are inferred from the claim text.