Rotating Non-Circular Probe for Downhole Seal Quality
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Solution Overview
Problem
Existing downhole sensors face challenges in accurately collecting data due to interference from borehole fluids and materials, as the quality of the seal between the sensor and the subterranean formation is often compromised by uneven borehole walls, leading to reduced data accuracy.
Innovation Solution
The use of a rotating, non-circular probe that can be rotated up to 360 degrees to find the optimal seal with the borehole or casing surface, ensuring a high-quality seal by measuring parameters such as fluid leakage, acoustic waves, or magnetic force, and adjusting rotation until a tool-formation quality threshold is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is positioned against the inner borehole surface, then data collection is enabled, but the seal quality is compromised due to uneven borehole walls, leading to interference from borehole fluids and materials
Solution Approach 1:
The probe is made rotatable relative to the downhole tool, allowing dynamic adjustment of the probe's orientation. This enables the probe to rotate and search for an optimal seal position against the borehole wall, transforming a static seal problem into a dynamic optimization process where the probe can adapt to uneven borehole surfaces by changing its angular position.
Solution Approach 2:
The probe is designed with a non-circular cross-section, creating an asymmetric geometry that allows it to engage with the borehole wall at specific orientations. This asymmetric shape enables the probe to achieve a better seal by rotating to the correct angular position, where the non-circular profile makes contact with the borehole surface more effectively than a circular cross-section would allow.
2Measurement precision
If the probe is made rotatable to improve seal quality, then measurement precision improves, but device complexity increases
Solution Approach 1:
The rotational mechanism is integrated directly into the downhole tool assembly, merging the probe rotation function with the existing tool structure. By combining the rotation mechanism with the downhole tool rather than using a separate, independent rotation system, the overall device complexity is minimized while still achieving the desired probe orientation adjustment.
Solution Approach 2:
The system includes sensors that can detect seal quality parameters, and the rotation mechanism can be controlled based on feedback from these sensors. This self-service approach allows the probe to automatically adjust its orientation to achieve optimal sealing, reducing the need for complex external control systems and manual intervention.
Data Source
AI summary
Probes with sensors can be positioned within a borehole. Certain types of sensor data is collected by placing the sensor against an inside surface of the borehole or casing. To help reduce the impact of fluid, solids, or other material in the borehole from affecting collected sensor data, a seal is used by the probe to separate the casing or subterranean formation from material in the borehole. The probe can be elliptical, rectangular, or other types of non-circular shapes. In some aspects, the probe can be rotated so the collected sensor data can be collected from different orientations improving the resolution of the data collected. In some aspects, the probe can be rotated until a tool-formation quality threshold is satisfied or until a determined or selected seal quality is achieved. The probe can be rotated by a specified number of degrees of rotation and rotate in one or both directions.