Downhole Packer Deformation Monitoring via Embedded Optical Fiber
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Solution Overview
Problem
Current downhole operations for fracturing and formation testing lack precise measurement capabilities for deformation and strain, which are crucial for accurately estimating formation properties and stress characteristics, often resulting in uncertainty and potential packer damage.
Innovation Solution
A system and method utilizing optical fiber sensors integrated with packer elements to measure deformation, strain, temperature, and pressure during fluid injection operations, allowing real-time monitoring and precise estimation of formation properties by correlating deformation with fluid injection data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional downhole measurement methods are used during fluid injection operations, then the operational simplicity is maintained, but the measurement precision of deformation and strain is insufficient leading to uncertainty in formation property estimation
Solution Approach 1:
The patent replaces conventional mechanical measurement systems with optical fiber-based measurement systems. Optical fibers are integrated into the packer deformable elements to directly measure deformation and strain through optical signal changes, providing high measurement precision while being immune to electromagnetic interference in harsh downhole environments.
Solution Approach 2:
The optical fiber measurement system is nested within the packer structure itself. The optical fibers are embedded in the deformable packer elements, allowing the measurement system to be integrated into the existing packer design without requiring separate external measurement devices, thus managing complexity through integration.
2Reliability
If optical fiber sensors are integrated with packer elements to measure deformation, then the measurement precision and reliability are improved, but the device complexity increases
Solution Approach 1:
The patent merges the measurement function with the packer structure by integrating optical fiber sensors directly into the deformable packer elements. This combination ensures that the measurement system and the packer operate as a unified reliable system, where the optical fibers directly experience the same deformations as the packer material itself.
Solution Approach 2:
The packer elements with integrated optical fibers perform self-measurement of their own deformation and strain. The optical fibers are embedded within the packer material, allowing the structure to monitor its own state without requiring external sensing systems, thereby improving reliability through direct structural feedback.
3Measurement precision
If real-time optical signal measurement is implemented during fluid injection, then the measurement precision and real-time monitoring capability are improved, but the use of energy and system complexity increase
Solution Approach 1:
The optical fiber measurement system enables continuous real-time monitoring of packer deformation throughout the fluid injection process. Optical signals are continuously transmitted through the fibers embedded in the packer elements, providing uninterrupted measurement data without requiring repeated mechanical measurements or interruptions in the injection process.
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 system provides accurate and reliable measurements of deformation and strain, reducing uncertainty in formation property estimation and ensuring packer integrity, while being immune to electromagnetic interference and suitable for harsh environments.
Implementation Method 1
a measurement assembly including an interrogation unit coupled to at least one optical fiber, the at least one optical fiber having a length that includes a plurality of measurement locations, the length disposed at the deformable element, the interrogation unit including an electromagnetic source configured to direct an optical signal into the optical fiber during the downhole operation and a detector configured to detect signals reflected by the plurality of measurement locations
Data Source
AI summary
An embodiment of a system for performing a downhole operation includes a carrier having an isolation assembly including at least one packer having a deformable element configured to isolate a section of a borehole in the earth formation, and an injection assembly configured to inject a fluid into the isolated section and pressurize the isolated section. The system also includes a measurement assembly including an interrogation unit coupled to at least one optical fiber having a length disposed at the deformable element that includes a plurality of measurement locations, and a processor configured to receive signals reflected by the plurality of measurement locations in real time during the downhole operation, calculate an amount of deformation of the deformable packer element, and estimate at least one property of the formation based on the deformation, the at least one property including a strain of the formation in response to injection of fluid.