Packer Assembly with Fiber Optic Pass-Through for Zonal Isolation
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Solution Overview
Problem
Current wellbore production systems for open-hole wellbores with multiple zones face challenges in isolating zones, passing electrical or fiber optic cables, and monitoring temperature and pressure conditions, as conventional packer systems lack conduit pass-through capabilities and radial fluid communication, leading to contamination and inadequate condition monitoring.
Innovation Solution
A production tubing string assembly with hydrostatically-set packers and perforated screens, incorporating fiber optic sensor lines or hydraulic control lines that pass through packers to monitor wellbore conditions, allowing for unbroken sensing lines to the surface, and enabling temperature, pressure, or other wellbore conditions to be monitored while maintaining radial fluid communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large expansion packer system is used to provide large radial expansion of the sealing element, then isolation effectiveness is improved, but the ability to pass electrical or fiber optic cables axially through the packer assembly is lost
Solution Approach 1:
The packer assembly is divided into separate functional components: a mandrel that provides structural support and defines axial passages, and a carrier that provides the sealing element with large radial expansion capability. This segmentation allows each component to be optimized independently - the mandrel can accommodate cables while the carrier provides isolation.
Solution Approach 2:
The carrier is radially nested within the mandrel, creating a concentric arrangement where the carrier's sealing element can expand radially against the wellbore wall while the mandrel's axial passages remain intact for cable penetration. This nested configuration allows both isolation and conduit pass-through functions to coexist.
2Reliability
If complete pressure isolation is maintained between the conduit and the annulus, then cable protection is improved, but radial communication of fluid from the flowbore to the exterior is prevented
Solution Approach 1:
The mandrel is segmented with separate functional zones: axial passages for cable protection and radial passages for fluid communication. This segmentation allows the system to maintain pressure isolation around cables while enabling controlled fluid communication through dedicated radial pathways.
Solution Approach 2:
The mandrel acts as an intermediary structure that mediates between the need for cable protection and fluid communication. It provides a controlled environment where cables are isolated from annular pressure while radial passages allow fluid to communicate from the flowbore to the exterior through the mandrel body.
3Reliability
If multiple interior pieces are used to define longitudinal cable passages, then cable protection is improved, but assembly complexity and fabrication difficulty increase
Solution Approach 1:
The mandrel and carrier are merged into a single integrated assembly where the carrier is radially nested within the mandrel. This merging reduces the number of separate components that need to be assembled, simplifying the overall construction while maintaining cable protection through the mandrel's axial passages.
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 effective isolation and monitoring of individual zones within open-hole wellbores, preventing fluid contamination and allowing for controlled production while providing real-time data on wellbore conditions, overcoming limitations of prior systems.
Implementation Method 1
The use of multiple interior pieces, such as a separate carrier and mandrel, to define a longitudinal cable/conduit pass-through, and the attendant assembly requirements, also adds to the difficulty of incorporating a cable feed-through feature into a hydrostatically-set device.
Implementation Method 2
One or more fiber optic sensor lines are disposed upon the outside of the screens and running portion of the production tubing string.
Data Source
AI summary
Devices and methods for monitoring wellbore conditions while conducting hydrocarbon production within a wellbore, particularly an open-hole wellbore, having multiple zones within. A production tubing string assembly is made up having a plurality of packers for sealing within an open-hole wellbore having multiple individual zones. The production tubing string includes production nipples and one or more fiber optic sensor lines disposed upon the outside of the production tubing string. The sensor line or lines are disposed through the packers using a pass-through system so as to provide unbroken sensing line(s) to the surface of the wellbore. This allows temperature, pressure or other wellbore conditions to be monitored at the surface in each of the individual zones of interest.