Downhole Cleaning Tool With Brushes and Jets
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Solution Overview
Problem
Existing methods for enhancing hydrocarbon recovery from downhole environments are inefficient and often damage the formation, as they require multiple tools and can't clear well casing perforations without leaving residue or altering permeability.
Innovation Solution
A device comprising a hollow tube with brushes and nozzles attached to a work string, which includes a filter and is designed to scrub the well casing and adjacent formations using high-pressure jets to remove wax, scale, and other residues, thereby improving fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple tools are used to remove debris and clear well casing perforations, then cleaning effectiveness is improved, but operation complexity and time consumption increase
Solution Approach 1:
The patent combines multiple cleaning functions (brushing, scraping, and jetting) into a single integrated downhole cleaning tool. The tool features a hollow tube with brushes on the outer surface, scrapers attached to the inner surface, and jet nozzles positioned to direct fluid at perforations, eliminating the need for multiple separate tools and reducing operational complexity while maintaining comprehensive cleaning effectiveness
Solution Approach 2:
The downhole cleaning tool is designed as a multi-functional device that simultaneously performs mechanical brushing, scraping, and hydraulic jetting operations. This universal tool can handle various types of debris and obstruction within a single deployment, replacing the need for multiple specialized tools and reducing the overall complexity of the cleaning operation
2Reliability
If multiple tools are used to clear well casing, then cleaning thoroughness is improved, but time consumption increases
Solution Approach 1:
The patent merges multiple cleaning mechanisms into one tool that operates simultaneously during a single downhole deployment. The brushes, scrapers, and jet nozzles work in parallel to clean different aspects of the well casing and perforations at the same time, achieving thorough cleaning without the time penalty of sequential multi-tool operations
Solution Approach 2:
The integrated cleaning tool maintains continuous cleaning action as it is pulled through the well casing. The brushes continuously contact the inner surface, scrapers continuously engage with deposits, and jet nozzles continuously flush perforations throughout the entire retrieval stroke, maximizing cleaning efficiency and minimizing total operation time
3Object-generated harmful factors
If conventional cleaning methods are used, then debris removal is achieved, but formation permeability is altered and formation damage occurs
Solution Approach 1:
The patent applies cleaning actions with locally appropriate intensity and method. Jet nozzles are positioned to direct high-velocity fluid specifically at perforations and localized debris deposits, while brushes and scrapers are configured to clean the casing interior without excessive force. This localized, targeted approach effectively removes debris while minimizing disruption to the surrounding formation and avoiding permeability alteration
Solution Approach 2:
The patent replaces aggressive mechanical cleaning methods with a combination of hydraulic jetting and gentle mechanical action. The high-velocity fluid jets perform the primary debris removal function, reducing the need for forceful mechanical scraping that could damage the formation. This substitution of mechanical force with hydraulic energy protects formation integrity while achieving thorough debris removal
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 solution effectively enhances hydrocarbon recovery by efficiently clearing obstructions in well casings and formations, maintaining formation integrity, and improving fluid flow without damaging the geological structure.
Implementation Method 1
designed to scrub the well casing and adjacent formations using high-pressure jets to remove wax, scale, and other residues
Implementation Method 2
brushes on the outer circumferential surface... a plurality of bristles on the outer circumferential surface
Data Source
AI summary
A device for improving down hole operations includes a tube that delivers high pressure jets of fluid against the interior surface of a well casing and optionally into perforations of the well casing. The tube also includes a helical array of brushes that scrape and scratch accumulated residue from the interior surface of a well casing and optionally into perforations of the well casing. A method for improving down hole operations includes moving the device into a bend or turn in an existing well casing string and retracting a nozzle or brush to facilitate passage of the device past the bend or turn.