Long-Screened Test Well Profiling for Vertical Groundwater Chemistry
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Solution Overview
Problem
Existing groundwater profiling systems for locating new production wells are financially constrained and provide inadequate data due to sparse vertical testing, leading to high construction costs and water quality failures from blending non-compliant groundwater with compliant water, often missing contaminant concentrations near lithologic boundaries.
Innovation Solution
A method involving drilling a pilot hole, installing a long-screened test well with a pump and packer assembly, and using miniaturized technologies to perform dynamic steady-state flow and chemistry profiling at multiple depths within the well, enabling detailed groundwater analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional zone tests with limited vertical testing are used, then testing costs are reduced, but water quality data completeness deteriorates leading to blending non-compliant groundwater with compliant water
Solution Approach 1:
The patent divides the groundwater testing process into multiple discrete depth intervals within the well, performing separate flow and chemistry profiling at each interval. This segmentation allows comprehensive vertical delineation of water quality without requiring a single complex system, as each interval can be tested independently using the same standardized apparatus.
Solution Approach 2:
The patent employs a universal testing apparatus that can be deployed at multiple depths and performs both flow profiling and chemistry analysis functions. This multi-functional device eliminates the need for separate specialized equipment for each testing parameter, reducing overall system complexity while enabling comprehensive data collection across multiple vertical intervals.
2Measurement precision
If sparse vertical testing is performed, then testing time and costs are reduced, but measurement precision of water quality distribution deteriorates
Solution Approach 1:
The patent implements continuous flow profiling and chemistry sampling across multiple consecutive depth intervals within the well. By maintaining continuous pumping and sequential sampling operations at each interval without interruption, the system achieves high measurement precision across the entire vertical profile while minimizing total testing time compared to discontinuous or repeated testing approaches.
3Reliability
If detailed flow and chemistry profiling at multiple depths is performed, then water quality identification accuracy is improved, but device complexity and operational complexity increase
Solution Approach 1:
The patent nests multiple measurement and sampling functions within a single deployable apparatus. The flow profiler and chemistry sampling system are integrated into one unit that can be positioned at different depths, eliminating the need for multiple separate devices and reducing operational complexity despite performing detailed multi-parameter profiling.
4Length of stationary object
If long-screened test wells are used, then vertical coverage is improved, but difficulty of performing detailed testing at multiple depths increases
Solution Approach 1:
The patent replaces complex mechanical positioning and sampling systems with a pump-based flow and chemistry profiling approach. By using controlled pumping to move water through the well and collecting samples at different depths, the system achieves detailed vertical delineation in long-screened wells without requiring complex mechanical deployment mechanisms, thereby reducing testing difficulty.
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
This approach significantly increases the number of vertical delineations, reducing the risk of water quality failures by identifying potential geochemical issues before well construction, thus minimizing construction overruns and ensuring compliance with regulatory limits.
Implementation Method 1
positioning a pump within the test well, the pump being configured to move the groundwater within the test well
Implementation Method 2
positioning a packer assembly within the test well, the packer assembly being configured to selectively provide a seal between the test well and the pilot hole
Data Source
AI summary
A method and system for determining dynamic steady-state flow and chemistry of groundwater within a long-screened test well, includes (i) drilling a pilot hole through an aquifer; (ii) installing a test well within the pilot hole, including a well screen that is at least 40 feet in length; (iii) positioning a pump within the test well to move the groundwater within the test well; (iv) positioning a packer assembly within the test well to selectively provide a seal between the test well and the pilot hole; and (v) performing downhole testing at a plurality of different depths within the test well with miniaturized technologies that are equal to or less than 1.5 inches in diameter to determine a dynamic steady-state flow and chemistry profile of the groundwater within the test well. The pump is used at a first depth and then is moved to a second depth within the test well to perform stacked dynamic steady-state flow and chemistry profiles. The miniaturized technologies include a tracer injection system that determines downhole velocity and flow measurements of the groundwater within the test well, and a groundwater sampling system that selectively removes groundwater samples from the test well.