Rotating Brush Well Cleaning Tool for Horizontal Debris Removal
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Solution Overview
Problem
In well cleaning operations, especially in horizontal wells, debris such as drill cuttings, sticky petroleum residues, and particulates accumulate along the well wall, causing accessibility issues and equipment malfunctions due to their distribution along the well length, rather than being concentrated at the bottom, making conventional cleaning tools ineffective.
Innovation Solution
A well cleaning tool equipped with a steerable assembly sub, conveying device, rotatable brush assembly, electromagnetic coil for capturing metallic debris, noise detector, and multiple nozzles for fluid delivery, which can be deployed during or after drilling to dislodge and remove debris using well fluid flow, radially centering and scraping the well wall, and capturing metallic debris while carrying away non-metallic debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cleaning tools are used in horizontal wells, then the tools can operate in the well, but they fail to effectively remove debris distributed along the well length
Solution Approach 1:
The brush assembly is made rotatable to dynamically engage with debris distributed along the well wall. The rotation mechanism allows the brushes to actively scrape and dislodge debris rather than relying on static contact, significantly improving cleaning effectiveness in horizontal wells where gravity cannot concentrate debris at the bottom.
Solution Approach 2:
The cleaning tool integrates multiple functions including debris dislodgement via rotating brushes, metallic debris capture via electromagnetic coil, fluid delivery via nozzles, and monitoring via noise detector. This multi-functional design makes the tool universally effective for various types of debris and well conditions, particularly in horizontal wells where conventional single-function tools fail.
2Productivity
If brush assembly rotation is added to dislodge debris, then debris removal capability improves, but device complexity increases
Solution Approach 1:
The electromagnetic coil replaces complex mechanical sorting mechanisms by using magnetic fields to automatically capture metallic debris. This substitution simplifies the overall device structure while maintaining high debris removal capability, as the magnetic field naturally attracts and collects metallic particles without requiring additional mechanical sorting components.
Solution Approach 2:
The noise detector provides automatic monitoring and feedback on debris removal effectiveness without requiring external intervention. The system self-regulates by detecting noise levels that indicate successful debris dislodgement, reducing the need for complex external control systems while maintaining high productivity.
3Productivity
If electromagnetic coil is added to capture metallic debris, then debris capture capability improves, but device complexity and cost increase
Solution Approach 1:
The electromagnetic coil replaces complex mechanical sorting mechanisms by using magnetic fields to automatically capture metallic debris. This substitution simplifies the overall device structure while maintaining high debris removal capability, as the magnetic field naturally attracts and collects metallic particles without requiring additional mechanical sorting components.
4Productivity
If multiple nozzles are added for fluid delivery, then cleaning effectiveness improves, but device complexity increases
Solution Approach 1:
The fluid delivery system is segmented into multiple nozzles positioned at different locations and angles. This segmentation allows targeted fluid delivery to specific areas of the well wall where debris accumulates, improving overall cleaning effectiveness while keeping each individual nozzle simple in design.
Solution Approach 2:
The multiple nozzles serve universal cleaning functions across different well configurations and debris types. By distributing multiple simple nozzle units throughout the tool, the system achieves comprehensive cleaning coverage without requiring a single complex fluid delivery mechanism.
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 tool effectively removes both sticky and non-sticky debris from the well wall, improving accessibility and reducing the need for multiple cleaning operations, while the noise detector monitors debris removal efficiency and prevents operational complications.
Implementation Method 1
an electromagnetic coil for capturing metallic debris that has been dislodged by the brush assembly
Implementation Method 2
multiple nozzles for jetting substances (for example, cleaning fluids) that can aid in a cleaning operation carried out at the well
Data Source
AI summary
A well cleaning tool includes a positioning device configured to control a position of the well cleaning tool within a well, a rotatable brush assembly configured to scrape a wall of the well, a capture device configured to catch debris dislodged from the wall by the rotatable brush assembly, and a fluid delivery assembly configured to deliver a cleaning fluid to the well.