Well Liner Tracer Placement Annular Gap Cementing
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Solution Overview
Problem
Existing well liner tracer systems face issues where apertures intended for fluid flow become blocked with cement during the cementing process, preventing contact between the tracer and well fluids and potentially reducing fluid flow, and it is impractical to place tracer material within the liner due to interference with cement flow or disturbance during cementing.
Innovation Solution
A well liner system comprising a tracer-liner portion with an inner and outer tube, where the tracer material is fixed to the outer surface of the inner tube with an annular gap between the tubes, allowing for controlled placement and avoiding blockages, and perforations are formed post-cementing to enable fluid contact with the tracer material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tracer material is placed within the liner bore, then accurate tracer placement is achieved, but the tracer material interferes with cement flow and may be disturbed during cementing
Solution Approach 1:
The tracer material is relocated from the inner bore (one-dimensional space) to the annular space between inner and outer tubes (two-dimensional space), eliminating interference with cement flow through the inner tube while maintaining precise placement capability
Solution Approach 2:
The liner is divided into inner and outer tubes creating separate functional zones: the inner tube handles cement flow while the annular space contains the tracer material, separating conflicting functions into distinct spatial segments
2Ease of operation
If apertures are provided in the liner for fluid flow, then fluid contact with tracer is enabled, but the apertures become blocked with cement during cementing
Solution Approach 1:
Perforations are created after cementing is complete rather than before, ensuring that the cementing process proceeds without obstruction while the tracer system is already in place and ready for future fluid contact
Solution Approach 2:
The fluid flow function is extracted from the cementing process by using the existing perforations in the wellbore rather than relying on liner apertures, allowing cementing to proceed unimpeded while maintaining tracer accessibility
Data Source
Figure 1~2
Figure 3~4
AI summary
A tracer-liner portion comprises an inner tube and an outer tube, each comprising at least one wall having an internal surface and an external surface, the walls of the inner tube and the outer tube being impermeable to fluid flow, said outer tube having an internal diameter which is larger than the outer diameter of said inner tube, said inner tube being arranged coaxially within said outer tube such that at least a portion of the external surface of said inner tube is covered by said outer tube; the internal diameter of the outer tube exceeds the outer diameter of the inner tube by an amount sufficient to form a space between the external surface of the inner tube and the internal surface of the outer tube, and a tracer material containing a tracer compound is present in said space.