Modular Solution Mining Horizontal Wellbore Cavern Control
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Solution Overview
Problem
Conventional solution mining methods using vertical wellbores are inefficient due to prolonged time for dissolving salts or minerals and low flow rates, requiring large surface areas and high flow rates for mineral dissolution.
Innovation Solution
A modular solution mining system involving controlled horizontal well connections with injection points relocated from toe to heel as caverns are depleted, utilizing turbulent solvent flow to enhance mineral dissolution and increase production rates by creating a single elongated cavern with balanced resource sweep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vertical wellbores are used for solution mining, then the method is simpler to implement, but the dissolution time is extended and flow rates are low
Solution Approach 1:
The patent transitions from vertical wellbores to horizontal wellbores, changing the spatial dimension of mineral contact. This dimensional shift increases the surface area between the solvent and mineral deposit, thereby accelerating dissolution rates and improving productivity while maintaining implementation feasibility
Solution Approach 2:
The patent divides the mineral deposit into multiple discrete caverns along the horizontal wellbore path. Each cavern acts as an independent dissolution zone, allowing parallel processing of multiple mineral segments simultaneously, which significantly increases overall dissolution rate and productivity
2Device complexity
If vertical wellbores are used for solution mining, then the system is simpler, but large surface area is required for mineral dissolution
Solution Approach 1:
By transitioning to horizontal wellbores, the system utilizes the lateral extent of the deposit rather than requiring extensive vertical spacing. This dimensional change allows multiple dissolution zones to be accessed from a single surface location, reducing the required surface footprint while maintaining system simplicity
3Ease of operation
If injection points are fixed, then the system is simpler to operate, but cavern depletion is uneven and productivity decreases
Solution Approach 1:
The patent implements movable injection points that can be repositioned along the horizontal wellbore as caverns are depleted. This dynamic adjustment allows the system to continuously access fresh mineral zones, maintaining high productivity levels throughout the mining operation while adding manageable operational complexity
Solution Approach 2:
The system incorporates monitoring of cavern depletion status to determine when injection points should be relocated. This feedback mechanism ensures that injection points are strategically positioned in areas with remaining mineral reserves, optimizing productivity while maintaining operational control
4Use of energy by moving object
If turbulent solvent flow is not used, then energy consumption is lower, but dissolution time is extended
Solution Approach 1:
The patent utilizes the natural pressure differential created by horizontal wellbore geometry and solvent injection to generate turbulent flow conditions. By optimizing injection pressure and wellbore configuration, the system achieves turbulent flow that accelerates dissolution without requiring excessive energy input, balancing energy consumption with dissolution time reduction
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 reduces time delays between injection and production, increases mineral flow rates, and ensures uniform cavern expansion, addressing the inefficiencies of conventional methods.
Implementation Method 1
injecting a solvent into the horizontal injection portion; generating a turbulent solvent flow proximate to the toe end to generate a mineral solution
Implementation Method 2
generating a turbulent solvent flow proximate to the toe end to generate a mineral solution
Data Source
AI summary
A modular solution mining method may include the steps of: providing an injection wellbore, the injection wellbore including a horizontal injection portion, in which the horizontal injection portion includes a toe end and heel end; providing a production wellbore, in which the production wellbore includes a horizontal production portion that is proximate to the toe end; injecting a solvent into the horizontal injection portion; generating a turbulent solvent flow proximate to the toe end to generate a mineral solution and an initial cavern proximate to the horizontal production portion; and motivating the mineral solution from the initial cavern, into the horizontal production portion, and to a surface location. Optionally, the method may include the step of repositioning the turbulent solvent flow to be closer to heel ends to generate mineral solution and subsequent caverns further from horizontal production wellbore.