Caliper Tool Non-Contact Sensor for High Pressure Wellbores
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Solution Overview
Problem
Current caliper tools used in wellbore operations face challenges in accurately measuring borehole geometry in high-pressure environments due to the limitations of dynamic seals, which can fail under pressures exceeding 30,000 psi, and require complex designs to maintain reliability and accuracy.
Innovation Solution
A non-contact sensor arrangement is employed in the caliper tool, utilizing a magnetically-permeable target and inductive coupling to measure the pivot angle of articulated arms, eliminating the need for dynamic seals and simplifying the design, while allowing the tool to withstand high pressures and maintain accuracy across wide temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic seals are used in contact sensors, then mechanical contact measurement is enabled, but reliability deteriorates under high pressure exceeding 30,000 psi
Solution Approach 1:
The patent replaces the mechanical contact sensor system with a non-contact inductive sensor system. The inductive sensor measures the position of the articulated arm through electromagnetic coupling without physical contact, eliminating the need for dynamic seals that fail under high pressure. This substitution of mechanical measurement with electromagnetic measurement resolves the reliability issue in high-pressure environments.
Solution Approach 2:
The patent introduces a non-magnetic, non-conductive target attached to the articulated arm as an intermediary element. The inductive sensor detects changes in inductance caused by the target's position without direct contact. This intermediary enables measurement while maintaining isolation between the sensor and the high-pressure environment, preventing pressure-related failures.
2Reliability
If non-contact sensor arrangement is used, then reliability in high pressure environments is improved, but device complexity increases
Solution Approach 1:
The inductive sensor assembly is designed to perform multiple functions: it measures the position of the articulated arm, provides electrical isolation from the high-pressure environment, and requires no maintenance-free operation. By consolidating these functions into a single non-contact sensor system, the patent reduces overall device complexity while maintaining high reliability.
Solution Approach 2:
The patent extracts the measurement function from the high-pressure environment by using a non-contact sensor. The inductive sensor remains in a controlled, low-pressure environment while still measuring the articulated arm's position through electromagnetic coupling. This extraction eliminates the need for complex pressure containment and sealing systems.
3Reliability
If dynamic seals are used to prevent fluid entry, then sensor protection is improved, but measurement precision deteriorates due to seal interference
Solution Approach 1:
The patent replaces mechanical contact measurement that required dynamic seals with non-contact inductive measurement. The inductive sensor detects the target's position through electromagnetic fields without physical contact or seals, completely eliminating seal-related measurement interference and achieving high precision in high-pressure environments.
4Ease of manufacture
If contact sensors with dynamic seals are used, then ease of manufacture is improved, but productivity deteriorates due to frequent maintenance and replacement
Solution Approach 1:
The non-contact inductive sensor system is designed to be maintenance-free and requires no replacement parts. The sensor and target are solid-state components with no moving parts or consumable elements. This self-service characteristic eliminates downtime for maintenance and replacement, significantly improving operational efficiency and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The non-contact sensor arrangement enables the caliper tool to reliably measure wellbore shape and size in high-pressure environments, reducing complexity and measurement errors, and extending the tool's service life by avoiding mechanical contact and dynamic seals.
Implementation Method 1
A non-contact sensor arrangement is employed in the caliper tool, utilizing a magnetically-permeable target and inductive coupling to measure the pivot angle of articulated arms
Data Source
AI summary
A caliper tool for measuring a shape of a wellbore may include a sensor assembly and a movable measurement component including a hub and a measurement arm extending from the hub, and a magnetically-permeable target coupled to the hub and configured to rotate with the hub upon movement of the measurement arm. A sensor assembly includes primary coil and one or more secondary coils spaced apart from the primary coil, wherein output signals from the secondary coils facilitates measurement of the shape of the wellbore.