Rolling Probe EM Inspection for Wellbore Casing Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nondestructive testing methods for wellbore casings, such as MFL and EC measurements, face challenges in effectively monitoring structural integrity due to limitations in detecting corrosion and mechanical stress-induced degradation over time, which can lead to failures if not regularly inspected.
Innovation Solution
A nondestructive inspection apparatus and method utilizing rolling contact engagement with rolling probe devices equipped with measurement instrumentation, such as microstrip antennae, to capture electromagnetic data indicative of structural properties, providing comprehensive imaging and defect identification through rolling contact engagement and data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireline-deployed tools are used for MFL or EC measurements, then structural integrity monitoring is enabled, but measurement precision and reliability are insufficient for detecting corrosion and mechanical stress degradation
Solution Approach 1:
The patent replaces conventional wireline-deployed electromagnetic measurement tools with a rolling contact inspection system that uses mechanical rolling motion to enable comprehensive electromagnetic scanning. The rolling probe devices with microstrip antennas make contact with the casing inner surface, allowing eddy current measurements to be taken while the tool rolls along the casing, thereby improving both measurement precision and reliability through continuous contact and multi-angle inspection.
Solution Approach 2:
The inspection system transitions from static wireline measurements to dynamic rolling contact measurements. The rolling probe devices rotate and move along the casing surface, enabling continuous data acquisition from multiple positions and angles. This dynamic inspection approach improves detection capability by capturing structural variations throughout the entire casing circumference, thereby enhancing both measurement precision and monitoring reliability.
2Reliability
If regular inspection is performed to detect degradation, then safety and environmental risks are reduced, but inspection time and operational disruption increase
Solution Approach 1:
The rolling contact inspection system enables continuous electromagnetic measurements as the tool rolls along the casing length. Unlike discrete point measurements from wireline tools, the rolling probes continuously scan the casing surface, allowing complete inspection of long casing sections in a single pass. This continuous inspection approach maintains high safety standards while reducing total inspection time and minimizing operational disruption.
Solution Approach 2:
The rolling probe devices create a controlled inspection environment by maintaining consistent mechanical contact with the casing inner surface. This stable contact ensures reliable electromagnetic coupling between the microstrip antennas and the casing, producing consistent measurement quality throughout the inspection. The inert-like stability of the rolling contact reduces measurement variability, enabling faster, more reliable inspections that enhance safety without increasing time loss.
3Measurement precision
If comprehensive imaging is achieved through rolling contact engagement, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The inspection system divides the casing surface into multiple inspection zones by using several rolling probe devices spaced around the tool body. Each probe independently scans its sector of the casing, and the data from all probes are integrated to form a complete circumferential image. This segmentation approach improves defect detection capability by providing multiple viewing angles while managing device complexity through modular probe design.
Solution Approach 2:
The rolling probe devices serve multiple functions simultaneously: they provide mechanical support for the tool, enable positional tracking through their rotation, and carry the electromagnetic measurement instrumentation. The microstrip antennas on each rolling probe perform both eddy current measurement and serve as reference markers for position encoding. This multi-functionality improves defect detection capability while minimizing the increase in device complexity by eliminating separate systems for each function.
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
Enables reliable and comprehensive monitoring of wellbore casing integrity by capturing detailed electromagnetic measurements, allowing for early detection of corrosion and mechanical stress, thereby preventing failures and informing timely maintenance decisions.
Implementation Method 1
measurement instrumentation, such as microstrip antennae, to capture electromagnetic data indicative of structural properties
Implementation Method 2
Casing inspection is often performed using wireline-deployed tools capturing magnetic flux leakage (MFL) measurements or eddy current (EC) measurements
Data Source
AI summary
An apparatus and method provides for nondestructive inspection of a generally tubular target structure (such as a wellbore casing) by rolling contact engagement of one or more rolling probe devices with the target structure. Each rolling probe device carries electromagnetic (EM) measurement instrumentation to capture measurement data during rolling contact engagement with the casing. Each rolling probe device may comprise an instrumentation carrier (e.g., a roller or a wheel) having an endless tread surface to engage the target structure, with the EM measurement instrumentation extending along the endless tread surface and being located at or adjacent an exterior of the instrumentation carrier. A plurality of such rolling instrumentation carriers can be mounted at azimuthally spaced positions on a tool body configured for axial movement along a wellbore.