Float Shoe Eccentric Nose Cement-Filled Composite Design
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Solution Overview
Problem
Conventional float shoe noses made from composite and aluminum materials are costly and difficult to drill, with composite materials often breaking into pieces that obstruct the drilling assembly, while aluminum materials are hard to drill and increase overall equipment costs.
Innovation Solution
A float shoe design featuring a nose with a molded shell composed of composite or drillable metal, attached to a housing with a snap-in feature, filled with cement to provide strength and drillability, and equipped with a conical or eccentric shape to facilitate passage through boreholes, reducing costs and improving drillability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If composite or aluminum materials are used for the float shoe nose, then the nose provides sufficient strength to overcome high loads, but the materials become costly and difficult to drill
Solution Approach 1:
The float shoe nose combines a metallic housing with a composite or drillable metal liner material, creating a composite structure that leverages the strength of metal and the drillability of composite materials. This allows the nose to withstand high loads while remaining cost-effective and easy to drill.
Solution Approach 2:
Different parts of the float shoe nose have different material properties - the housing provides structural strength while the liner material provides drillability. This local differentiation of material qualities allows each component to optimize its function without compromising the other.
2Shape
If composite materials are used for the float shoe nose, then the nose can be given a conical or eccentric shape to facilitate passage through boreholes, but the materials break into pieces that obstruct the drilling assembly
Solution Approach 1:
The composite or drillable metal liner material within the metallic housing provides the desired conical or eccentric shape while maintaining structural integrity that prevents breaking into obstructive pieces during drilling operations.
Solution Approach 2:
The liner material acts as a flexible or semi-flexible component that can be formed into complex shapes (conical or eccentric) while the metallic housing provides the rigid structural support needed to prevent fragmentation during drilling.
3Ease of manufacture
If aluminum materials are used for the float shoe nose, then the nose can be made drillable, but the overall equipment costs increase
Solution Approach 1:
Instead of making the entire float shoe nose from expensive aluminum, only the liner material is made from drillable material while the housing uses more cost-effective metal, reducing overall equipment cost while maintaining drillability where needed.
Solution Approach 2:
The combination of metallic housing with composite or drillable metal liner creates a cost-effective composite structure that provides drillability only in the necessary areas, reducing material costs compared to using aluminum throughout.
Data Source
Figure 1~2C
Figure 3
Figure 4A~4B
AI summary
A float shoe for a downhole tubular or casing includes a housing, a nose, a support, and a valve. The housing is attached to the casing, and the nose having a shell of a millable material (e.g., composite, aluminum, etc.) extends from the housing. A support of cement, fills an internal cavity of the nose's shell and support a valve in the housing. The shell for the nose defines a flow passage communicating with the valve and can have a conical or eccentric shape to facilitate passage of the float shoe in a borehole during run-in. The shell for the nose can also have a port or jet that communicate the flow passage out the side of the nose.