Downhole Separation Filter With Automatic Solids Flushing
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Solution Overview
Problem
Conventional downhole filters for drilling fluids become clogged, requiring removal from the wellbore for cleaning, leading to lost drilling time and increased costs, or releasing unfiltered fluid that damages downstream equipment.
Innovation Solution
A downhole separation system that automatically flushes collected solids into the annulus around its outer surface, using a sliding assembly and spring-biased mechanism to switch between filtering and flushing modes based on flow rate and pressure differentials, without requiring removal from the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filters are pulled out from the drill string for cleaning, then collected solid particles can be removed from the filter, but drilling operations must be stopped resulting in lost drilling time and increased drilling costs
Solution Approach 1:
The filter system automatically flushes collected solid particles downstream through a central fluid path using the drilling fluid flow itself, without requiring removal from the drill string or external intervention. The system serves itself by utilizing the existing fluid flow to clear its own filter elements.
Solution Approach 2:
The system performs preliminary flushing action during normal operation before the filter becomes completely clogged, maintaining continuous drilling operations. The flush pathway is prepared and available to clear particles proactively rather than reactively after complete clogging occurs.
2Ease of operation
If collected solid particles are flushed downstream through the central fluid path, then the filter can be cleared without removal, but increased amounts of solid particles flow through the drilling motor increasing wear and failure risk
Solution Approach 1:
The system extracts collected solid particles from the filter elements and removes them from the central fluid path that leads to the drilling motor. By providing a separate flush pathway, particles are taken out of the main flow route before they can reach and damage the drilling motor.
Solution Approach 2:
The flush pathway acts as an intermediary route that intercepts solid particles during the flushing operation. This intermediate path allows particles to be transported away from the filter without directing them through the drilling motor, serving as a mediator between the filter and motor.
3Quantity of substance
If filters retain solid particles in the collecting section, then filtration capacity is maintained, but the filter becomes clogged requiring removal or bypassing that allows unfiltered fluid to reach the drilling motor
Solution Approach 1:
The system maintains continuous filtration action by automatically flushing collected particles during operation. The filter elements remain in place and continue filtering while the flush pathway periodically clears accumulated particles, ensuring uninterrupted filtration without removal or bypassing.
Solution Approach 2:
The system discards collected solid particles by flushing them downstream through the central fluid path to the annulus. This recovery mechanism clears the filter capacity continuously, allowing the filter to maintain its filtering function without becoming clogged or requiring removal.
Data Source
AI summary
A downhole separation system for use upstream of any tool through which a media flows. The separation system filters at least a portion of any solids from the media flowing through a filter flow path. The separation system flushes at least a portion of the filtered solids through a flush flow path, through a flush outlet on an outer surface of a housing, and into a space surrounding the housing. A screen and an activation mechanism are disposed within a housing inner bore. The filter flow path extends through a plurality of openings in the screen. The activation mechanism is configured to move between a default position in which it directs fluid through the filter flow path and an activated position in which it directs fluid through the flush flow path. Optionally, a spring within the housing inner bore is configured to bias the activation mechanism toward the default position.