Sensing Link Placement for Wellbore Pressure Measurement
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Solution Overview
Problem
In wellbore operations, sensors struggle to accurately measure parameters like pressure and temperature near filter elements due to close tolerances with the wellbore wall, and debris accumulation can clog sensing links, impeding accurate readings.
Innovation Solution
The use of sensing links, such as fluid communication lines or electrical lines, coupled with debris barriers to extend gauge measurements radially across wellbore components, allowing parameters to be communicated from sensing points to gauges located at different longitudinal positions, while debris barriers protect against debris accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed directly at the sensing point near filter elements, then measurement precision is improved, but device complexity increases due to close tolerances with wellbore wall
Solution Approach 1:
A sensing link acts as an intermediary between the sensing point near the filter element and the gauge at a different longitudinal location. The sensing link extends the measurement capability without requiring direct placement of the gauge at the sensing point, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The system transitions from a single-point measurement approach to a distributed measurement approach by placing the gauge at a different longitudinal position along the wellbore tubular string. This dimensional separation allows the sensing link to bridge the gap radially and longitudinally, simplifying sensor placement while preserving measurement accuracy.
2Ease of operation
If sensing links are extended across wellbore components, then ease of operation is improved by allowing gauge placement at different locations, but reliability deteriorates due to debris accumulation clogging sensing links
Solution Approach 1:
The sensing system is segmented into distinct functional components: the sensing link for parameter communication and the debris barrier for protection. This segmentation allows the sensing link to maintain operational flexibility while the debris barrier independently protects against reliability-damaging debris accumulation.
Solution Approach 2:
The debris barrier converts the harmful effect of debris accumulation into a beneficial protective function. By strategically placing the debris barrier at the sensing point, the system allows the sensing link to extend freely for ease of operation while the barrier prevents debris from clogging the sensing link, thereby maintaining reliability.
3Device complexity
If gauges are placed at locations longitudinally separated from filter elements, then device complexity is reduced by avoiding tight tolerances, but measurement precision deteriorates due to radial misalignment
Solution Approach 1:
The sensing link serves as a mediator that bridges the radial and longitudinal gap between the gauge and the filter element. It transfers the parameter information from the sensing point at the filter element to the gauge at a different longitudinal location, maintaining measurement precision while reducing device complexity.
Solution Approach 2:
The sensing link performs multiple functions: it extends the measurement range radially across wellbore components, communicates parameters over longitudinal distances, and enables gauge placement at locations that simplify device assembly. This multi-functionality resolves the contradiction between complexity reduction and precision maintenance.
Data Source
AI summary
A sensing assembly for use in a wellbore comprises a wellbore component disposed in a wellbore tubular string, at least one gauge configured to sense at least one parameter, and at least one sensing link coupled to the at least one gauge. The at least one gauge is disposed at a first location along the wellbore tubular string, and the sensing link is configured to provide communication of at least one parameter from a sensing point at a second location to the first location. The sensing point is radially adjacent the wellbore component.