Float Collar Ball Deflector for Unobstructed Cementing Flow
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Solution Overview
Problem
Existing float collars in wellbores face challenges in efficiently managing the flow of fluids and preventing obstruction by balls during cementing operations, with prior art solutions being either fixed or not easily retrofittable to existing systems.
Innovation Solution
A float collar design incorporating a float valve, a tubular housing, a sheath, and a ball deflector made from drillable materials, featuring a ball deflector with an upper grate and lower anchor that can be easily installed into an existing float collar, ensuring unobstructed fluid flow and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball deflector is added to prevent ball obstruction, then fluid flow management is improved, but device complexity increases
Solution Approach 1:
The ball deflector is segmented into an upper grate portion and a lower anchor portion, allowing it to be installed as a separate component within the existing float collar housing. This segmentation enables the ball deflector to be added without redesigning the entire float collar assembly, thus improving fluid flow management while minimizing the increase in overall device complexity.
Solution Approach 2:
The ball deflector is nested within the existing float collar housing, with the upper grate portion positioned within the housing and the lower anchor portion engaging with the inner surface of the housing. This nesting approach allows the ball deflector to be integrated into the existing structure without requiring additional external components, thereby improving reliability while keeping device complexity manageable.
2Reliability
If a ball deflector with upper grate and lower anchor is installed, then ball obstruction is prevented, but ease of manufacture decreases
Solution Approach 1:
The ball deflector is divided into an upper grate portion and a lower anchor portion that can be manufactured separately and then assembled together. This segmentation allows each portion to be manufactured using standard processes and then joined through a simple installation process, reducing the overall manufacturing complexity compared to creating a completely new integrated component.
Solution Approach 2:
The lower anchor portion is designed to engage with the inner surface of the housing through self-aligning features, allowing the ball deflector to be installed without requiring complex assembly tools or procedures. The anchor portion automatically positions itself within the housing during installation, simplifying the manufacturing and assembly process.
3Adaptability or versatility
If float valve, sheath, and ball deflector are made from drillable materials, then adaptability to existing systems is improved, but strength decreases
Solution Approach 1:
The float valve, sheath, and ball deflector are made from drillable materials such as nonferrous metals or alloys, which changes the material parameters to be compatible with PDC drill bit drilling operations. This parameter change allows the components to be adapted to existing drillable wellbore systems while maintaining sufficient structural strength through careful material selection and design.
Solution Approach 2:
The use of nonferrous materials or alloys for the float valve, sheath, and ball deflector represents a composite material approach that combines drillability with adequate mechanical strength. These materials provide the necessary adaptability to existing drillable systems while maintaining the structural integrity required for wellbore operations.
Data Source
AI summary
A float collar for use in a wellbore includes: a float valve; a tubular housing having a coupling formed at a longitudinal end thereof for assembly as part of a downhole tubular; a sheath bonding the float valve to an inner surface of the housing within a flow bore thereof, the sheath having a bore formed therein; and a ball deflector seated against a top of the sheath and having: an upper grate and a lower anchor engaged with an inner surface of the sheath adjacent the bore. The float valve, the sheath, and the ball deflector are made from materials drillable by a polycrystalline diamond compact (PDC) drill bit.