Downhole Active Filter with Bypass for Mud Filtrate
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Solution Overview
Problem
Current techniques for formation evaluation during drilling are hindered by contamination of formation fluids with mud filtrate and drilling mud, which affects measurement accuracy and requires additional time for obtaining clean samples, leading to costly delays and erroneous results.
Innovation Solution
An active filter system is integrated into the downhole tool, providing a filter flow route and a bypass flow route within the sample flow line, allowing for the diversion of contaminants and ensuring that only clean formation fluid reaches contaminant-sensitive devices, with the ability to purge and clean the filter media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If formation fluid sampling is performed during drilling operations, then real-time formation evaluation is achieved, but contamination with mud filtrate and drilling mud occurs
Solution Approach 1:
The probe is divided into separate functional zones: a guard probe section that captures contaminants and a sample probe section that obtains clean formation fluid. This segmentation allows simultaneous sampling and contamination prevention during drilling operations.
Solution Approach 2:
A filter media is introduced as an intermediary between the formation fluid and the sampling chamber. The filter media selectively allows formation fluid to pass through while blocking mud filtrate and drilling mud contaminants, enabling real-time evaluation without contamination.
2Object-affected harmful factors
If traditional filtering methods are used, then contamination is reduced, but the filter media clogs and requires sacrificial sample bottles
Solution Approach 1:
The filter media is designed to be recoverable and reusable. After capturing contaminants during sampling operations, the filter media can be cleaned and reused, eliminating the need for sacrificial sample bottles and reducing tool downtime associated with filter replacement.
Solution Approach 2:
The filter system is integrated into the sampling tool in a manner that allows it to self-maintain during operations. The continuous flow of formation fluid helps prevent complete clogging by keeping the filter media surface active, extending operational life between maintenance intervals.
3Measurement precision
If wireline tools are used for formation testing, then accurate measurements are obtained, but drill string must be removed causing time loss
Solution Approach 1:
The formation testing functionality is merged with the drilling operations by integrating the sampling tool into the drill string. This allows formation evaluation to occur during drilling without requiring separate wireline trips, eliminating time loss while maintaining measurement capabilities.
Solution Approach 2:
The downhole tool is designed with multi-functionality, serving both as part of the drilling system and as a formation evaluation device. This universal design enables the tool to perform drilling functions and formation testing simultaneously, eliminating the need for separate operations.
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 active filter system effectively reduces contamination, enhances the accuracy of downhole fluid analysis, and prolongs the tool's operational life by preventing clogging, thereby improving the efficiency and reliability of formation fluid sampling and measurement processes.
Implementation Method 1
The filter system includes a filter media in fluid communication with the sample flow line and configured to filter the formation fluid as it passes through the sample flow line
Data Source
AI summary
An apparatus for testing a subterranean formation penetrated by a wellbore, comprising a tool having a sample flow line an inlet disposed with the tool and configured to establish fluid communication between the formation and the sample flow line to draw a fluid sample into the sample flow line, and an active filter positioned in the sample flow line and providing a filter flow route and a bypass flow route in the sample flow line.