Tracer Retaining Mechanism for Downhole Screen Assemblies
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Solution Overview
Problem
Retaining tracers in screen assemblies within wellbores is challenging due to fluid flow through openings, which can cause tracers to move along the annular space, making it difficult to determine the producing zone effectively.
Innovation Solution
The implementation of tracer retaining mechanisms such as rings, clips, and retainer rings that are coupled to the base pipes and screens, allowing fluid flow while preventing axial movement of tracers, ensuring they remain in a fixed position within each screen joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the annular space is closed at each axial end to retain tracers, then tracer retention is improved, but fluid flow through the joint is restricted
Solution Approach 1:
The patent applies local quality by implementing tracer retention mechanisms only at specific locations where needed, rather than closing the entire annular space. Retainer rings or clips are positioned locally at the axial ends of screen joints to contain tracers, while the rest of the annular space remains open to allow fluid flow through openings in the base pipe and filter media.
Solution Approach 2:
The patent segments the annular space into controlled and open zones. Retainer rings divide the annular space into separate compartments, allowing tracers to be retained in specific segments while fluid can still flow through other segments via openings in the base pipe and screen joints.
2Stability of the object's composition
If tracer retaining mechanisms are installed to prevent axial movement of tracers, then tracer position stability is improved, but device complexity increases
Solution Approach 1:
The patent introduces intermediary components such as retainer rings or clips that act as mediators between the tracer and the screen assembly structure. These retainers are simple circular components with protrusions that engage with the base pipe or filter media, providing tracer retention without requiring complex mechanical structures.
Solution Approach 2:
The retainer rings are designed as simple, inexpensive components that can be easily installed and removed. They serve their purpose of retaining tracers during shipping and installation, and can be discarded or replaced if needed, rather than requiring permanent complex retention structures.
3Productivity
If the annular space is connected across multiple screen joints to allow fluid flow, then fluid productivity is improved, but tracer retention becomes difficult
Solution Approach 1:
The patent applies local quality by implementing tracer retention mechanisms only at specific locations where annular spaces connect between screen joints, rather than throughout the entire connected annular space. This allows fluid to flow freely through the connected annular spaces while tracers are retained locally at connection points.
Solution Approach 2:
The patent extracts the tracer retention function from the main screen assembly structure and implements it as separate, removable retainer components. This allows the annular space to remain connected for fluid flow while tracers are held in place by extracted retention mechanisms at critical locations.
Data Source
AI summary
A screen assembly can include a tracer retaining mechanism for retaining a tracer in an annular area defined between a screen portion and a base pipe. The tracer retaining mechanism can be coupled to the screen portion, the base pipe, or the tracer. The tracer retaining mechanism can allow fluid flow in and out of the annular area.