Multi-Zone Packer Casing Scraper Assembly
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Solution Overview
Problem
Current tools for removing debris and burrs in wellbore casing are inflexible and inefficient, causing issues during the deployment of multi-zone completion technology, leading to increased costs and potential damage to equipment.
Innovation Solution
A wellbore casing scraper assembly is integrated with a multi-zone completion assembly, featuring radially deployable scrapers that can be positioned downhole to remove debris and burrs prior to the completion assembly encountering them, reducing the need for additional trips and minimizing ID interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If current tools for removing debris and burrs are used, then debris removal is achieved, but the tools are inflexible and cause ID interference that restricts tool size and increases operational complexity
Solution Approach 1:
The scraper assembly is nested within the multi-zone completion assembly, with the scraper housing positioned inside the completion assembly's outer diameter. This allows the scraper to be conveyed through the wellbore casing along with the completion assembly without requiring separate trips, eliminating ID interference issues while maintaining effective debris removal capability
Solution Approach 2:
The scraper assembly is combined with the multi-zone completion assembly into a single integrated unit. The scraper latch engages with the completion assembly, allowing both functions (debris removal and completion installation) to be performed simultaneously in one operation, reducing operational complexity and eliminating the need for separate de-burring trips
2Object-affected harmful factors
If separate de-burring trips are made before completion assembly installation, then debris removal is achieved, but drilling costs increase and operational time is extended
Solution Approach 1:
The scraper assembly is positioned to perform debris removal action before the completion assembly encounters debris during installation. The scrapers are deployed ahead of the completion assembly components, proactively removing burrs and debris before they can obstruct or damage the completion equipment, eliminating the need for preliminary separate de-burring trips
Solution Approach 2:
The scraper assembly continuously engages with the wellbore casing inner surface during the conveyance of the completion assembly, maintaining debris removal function throughout the entire installation process. This continuous action ensures debris is removed as the completion assembly progresses, rather than requiring separate intermittent trips
3Loss of time
If debris and burrs are not removed, then operational time is reduced, but equipment damage risk increases and reliability decreases
Solution Approach 1:
The scraper assembly applies preliminary anti-action by removing debris and burrs before they can cause harmful effects to the completion assembly. The scrapers actively counteract the potential damage by clearing the wellbore casing surface in advance, preventing burrs from cutting elastomeric packers or obstructing tool movement during installation
Data Source
AI summary
Provided is a method for deploying a multi-zone completion assembly, as well as a downhole tool and a well system. In one aspect, the method for deploying the multi-zone completion assembly includes coupling a casing scraper assembly to an inner service tool string hanging from a beginning section of a packer assembly suspended from a rig floor, the inner service tool string located within and extending below the beginning section of the packer assembly, and the casing scraper assembly located entirely below the beginning section of the packer assembly string. In one or more other aspects, the method includes completing the packer assembly string from the rig floor as the inner service tool string and casing scraper assembly are hanging therefrom.