Optimizing Artificial Recharge Well Screen Height and Injection Pressure
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Solution Overview
Problem
Current artificial recharge methods for confined aquifers often result in inefficient water injection due to reliance on experiential well design and pressure settings, leading to potential cracks in the aquiclude and reduced water injection capacity.
Innovation Solution
A method using a computer-based system to calculate optimal screen height and injection pressure for injection wells, determining the maximum permissible quantity of fresh water injection based on aquiclude and aquifer characteristics, ensuring efficient and safe water injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If much water is injected into one well, then water injection quantity is improved, but crack occurs in the aquiclude and water is lost
Solution Approach 1:
The injection system is divided into multiple wells instead of concentrating injection into one well. This segmentation distributes the injection pressure across different locations, preventing excessive pressure buildup that would cause cracks in the aquiclude while still achieving the desired total water injection quantity.
Solution Approach 2:
The invention changes the spatial distribution parameter of injection by configuring multiple wells at different positions and depths. This parameter change allows the system to achieve the required water injection quantity without exceeding the pressure tolerance of the aquiclude at any single location.
2Ease of manufacture
If appropriate number of wells and injection amount are determined based on experiences, then implementation simplicity is improved, but artificial recharge efficiency deteriorates
Solution Approach 1:
The invention performs preliminary calculation and optimization of well configuration, screen height, and injection pressure before implementation. By pre-determining the optimal number of wells, their positions, and operating parameters through systematic methods rather than experience, the design achieves both efficiency optimization and implementation simplicity.
Solution Approach 2:
The invention replaces the experience-based mechanical judgment system with a calculation-based optimization system. By using mathematical models and computational methods to determine well configuration and injection parameters, the system achieves higher efficiency while maintaining ease of implementation through clear quantitative guidelines.
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 optimizes artificial recharge by maximizing water injection while preventing aquiclude cracking, thereby enhancing the efficiency and effectiveness of the recharge process.
Implementation Method 1
injecting fresh water into a confined aquifer... calculating a maximum permissible injection pressure... determining an injection pressure P1 of the fresh water to be injected into the aquifer
Data Source
AI summary
There is provided a method for determining an optimal condition for artificial recharge by using a computer in an artificial recharge system provided with an injection well for injecting fresh water into an aquifer, the method including: a step of calculating a maximum permissible quantity of injection of fresh water to be injected into the aquifer; a step of determining a height of a screen which is an area on a side surface of the injection well where penetrating holes are formed, based on the calculated maximum permissible quantity of injection; and a step of determining an injection pressure of the fresh water to be injected into the aquifer, based on the height of the screen.