Self-Cleaning Downhole Filter Assembly to Prevent Packoff
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Solution Overview
Problem
Downhole debris removal apparatuses face issues with filtration members becoming clogged, leading to packoffs that require pulling the entire string out of the hole for cleaning, disrupting operations.
Innovation Solution
A downhole debris removal apparatus with a cleaning assembly that moves relative to the filtration member, such as rotating or translating, to dislodge particulate matter, maintaining filtration efficiency and preventing packoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filtration member is used to separate debris from circulating fluid, then debris separation efficiency is improved, but the filtration member becomes clogged with particulate matter over time
Solution Approach 1:
The patent applies preliminary action by incorporating a cleaning assembly that proactively removes particulate matter from the filtration member before complete clogging occurs. The cleaning assembly includes cleaning elements positioned to contact the filtration member surface and remove debris through mechanical action, preventing the filtration member from becoming fully blocked and maintaining its separation efficiency throughout operation.
Solution Approach 2:
The patent implements self-service through an automated cleaning system that continuously or periodically cleans the filtration member without requiring external intervention or removal of the apparatus from the wellbore. The cleaning assembly is driven by a motor or other actuation mechanism that automatically activates to remove particulate matter, allowing the filtration system to maintain itself during operation.
2Ease of manufacture
If the entire string is pulled out for cleaning when packoff occurs, then the filtration member can be cleaned, but operational continuity is disrupted
Solution Approach 1:
The patent applies segmentation by dividing the cleaning function into a separate, independent cleaning assembly that operates independently from the main debris removal apparatus. This cleaning assembly is positioned adjacent to the filtration member and can be activated to clean the filtration member without requiring removal of the entire apparatus from the wellbore, thus maintaining operational continuity while providing accessible cleaning capability.
Solution Approach 2:
The patent uses an intermediary cleaning assembly as a mediator between the filtration member and the external environment. This cleaning assembly includes cleaning elements that directly contact the filtration member surface and remove particulate matter, serving as an intermediate mechanism that enables cleaning without requiring full withdrawal of the apparatus. The cleaning assembly translates rotational motion into effective cleaning action through its positioning and engagement with the filtration member.
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 cleaning assembly effectively keeps the filtration member clear, allowing continuous operation by dislodging debris, thereby avoiding the need to withdraw the entire string for cleaning.
Implementation Method 1
a cleaning assembly positioned radially about at least a portion of the filtration member, the cleaning assembly configured to move relative to the filtration member to dislodge particulate matter from the filtration member
Data Source
AI summary
This disclosure provides a downhole debris removal apparatus, a method for operating a downhole debris removal apparatus, and a well system including the same. The downhole debris removal apparatus, in one aspect, includes an inner pipe positioned within a tubular, and a filtration member substantially encircling the inner pipe. The downhole debris removal apparatus, in this aspect, further includes a cleaning assembly positioned radially about at least a portion of the filtration member, the cleaning assembly configured to move relative to the filtration member to dislodge particulate matter from the filtration member.