Wellbore Gravity Energy Storage Using Suspended Masses
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Solution Overview
Problem
Current energy storage technologies, such as batteries and pumped hydro systems, face challenges in efficiency, environmental impact, and high initial costs, making them impractical for large-scale energy storage, especially with the intermittent nature of renewable energy sources like wind and solar.
Innovation Solution
The proposed solution involves a gravity-based potential energy conversion system that utilizes existing non-producing wellbores to store and release energy by suspending a movable mass within the well, leveraging the vertical distance to generate electricity, with features like monitoring systems and failsafe devices to manage environmental and operational risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If batteries and supercapacitors are used for large-scale energy storage, then energy storage capacity is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive batteries and supercapacitors with a simple gravity-based system using concrete blocks, steel cables, and basic mechanical components. The system uses inexpensive, readily available materials like concrete and steel to create energy storage capacity that can be scaled without proportionally increasing costs.
Solution Approach 2:
The patent replaces electrochemical energy storage (batteries/supercapacitors) with a mechanical gravity-based system. Instead of storing energy chemically, the system stores energy by lifting massive concrete blocks using gravity, converting electrical energy to gravitational potential energy and back again through simple mechanical means.
2Quantity of substance
If pumped hydro systems are used for large-scale energy storage, then energy storage capacity is improved, but environmental impact increases
Solution Approach 1:
The patent converts abandoned oil and gas wells, which are environmental liabilities requiring plugging and abandonment, into beneficial energy storage infrastructure. By repurposing these existing holes in the ground, the system avoids the environmental damage associated with building new pumped hydro reservoirs while providing useful energy storage capacity.
Solution Approach 2:
The patent extracts and eliminates the harmful environmental components of traditional pumped hydro systems (large surface reservoirs that disrupt ecosystems and require land flooding) while retaining the core energy storage function. The system uses subsurface vertical wells instead of surface reservoirs, removing the environmental harm while preserving the energy storage capability.
3Quantity of substance
If gravity-based systems use larger elevation differences to increase storage capacity, then energy storage capacity is improved, but construction cost increases
Solution Approach 1:
The patent makes existing oil and gas wells serve a dual function: they originally provided subsurface access for resource extraction, and now they provide both structural support for the energy storage system and the vertical elevation difference needed for gravity-based energy storage. This eliminates the need to build separate towers or pits for each well location.
Solution Approach 2:
The patent merges the structural infrastructure (well casing and cement) with the elevation-providing infrastructure (tower or pit) into a single integrated system. The well casing becomes both the structural containment and the vertical guide for the suspended mass, eliminating redundant construction and reducing overall costs.
4Quantity of substance
If pumped hydro facilities are installed to provide energy storage, then energy storage capacity is improved, but installation difficulty increases due to environmental regulations
Solution Approach 1:
The patent takes advantage of the preliminary infrastructure already in place from oil and gas well construction (drilled holes, installed casing, cemented annuli). By utilizing this pre-existing subsurface infrastructure, the system avoids the complex environmental permitting and construction processes required for building new pumped hydro reservoirs from scratch.
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 enhances energy storage efficiency, reduces environmental impact, and lowers infrastructure costs by repurposing abandoned wells, providing a viable and economically attractive solution for large-scale energy storage while minimizing methane leakage and visual impact.
Implementation Method 1
a generator operable to produce electricity when lowering the movable mass
Implementation Method 2
a motor operable to lift the movable mass
Data Source
AI summary
Potential energy conversion systems include a movable mass suspended by a line in a non-producing well, the line being coupled to a motor operable to lift the movable mass, and a generator operable to produce electricity when lowering the movable mass. Energy conversion methods include providing the potential energy conversion system; and storing potential energy by raising the movable mass, or releasing potential energy and converting the potential energy to electricity by lowering the movable mass.