Long-Screened Test Well for Stacked Groundwater Chemistry Profiling
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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 the repetitive and labor-intensive nature of conventional zone tests, leading to potential water quality failures and cost overruns from blending non-compliant groundwater with compliant zones.
Innovation Solution
A method involving drilling a pilot hole, installing a long-screened test well with a well screen and pump, and using miniaturized technologies to perform stacked dynamic steady-state flow and chemistry profiling at multiple depths, enabling detailed groundwater analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional zone tests are used to delineate vertical groundwater distribution, then the testing procedure can be performed with simple equipment, but the repetitive and labor-intensive nature leads to inadequate data and potential water quality failures
Solution Approach 1:
The patent combines multiple zone tests into a single continuous screen by installing a long-screened test well with a screen length of at least 40 feet that spans multiple aquifer zones. This merging approach eliminates the need for repetitive installation and removal of separate zone test intervals, while providing comprehensive vertical chemistry data across all screened intervals through a single integrated testing system.
Solution Approach 2:
The long-screened test well serves multiple functions simultaneously: it acts as both the test well structure and the sampling platform across multiple depths. The single well configuration enables flow profiling, chemistry sampling, and data collection for multiple aquifer zones without requiring separate testing equipment or procedures for each zone, thereby improving measurement precision while managing device complexity.
2Loss of information
If multiple separate zone tests are performed to obtain comprehensive vertical groundwater data, then complete chemical profiling can be achieved, but the process becomes excessively labor-intensive and time-consuming
Solution Approach 1:
The patent performs preliminary action by installing the long-screened test well with extended screen intervals (at least 40 feet) before conducting the actual chemistry profiling tests. This preliminary structural preparation allows subsequent flow and chemistry tests to be conducted continuously across multiple depths without the time-consuming repetitive installation and removal of separate zone test intervals, thereby reducing total testing duration while maintaining data completeness.
3Reliability
If long-screened test wells are used to provide comprehensive vertical delineation, then water quality risks can be identified more accurately, but the construction and operational costs increase
Solution Approach 1:
The patent applies local quality by concentrating the extended screen length (at least 40 feet) specifically within the saturated zone to target areas where groundwater quality variation is most critical. This localized approach to screening provides enhanced water quality assessment reliability at the most relevant depths while avoiding unnecessary construction complexity in unsaturated zones, thereby improving the balance between reliability and ease of manufacture.
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.