Coal Seam Water Injection Pressure Control via Hydraulic Gradient
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Solution Overview
Problem
Existing coal seam water injection technologies face challenges in effectively controlling water injection pressure, leading to difficulties in cracking with low-pressure injection and water flooding with high-pressure injection, which limits the dust reduction effect.
Innovation Solution
A method for bedding precise pressurized water injection based on coal seam interval hydraulic gradient calculation, involving the construction of pressure measurement boreholes around a water injection borehole, real-time pressure monitoring, and adjusting water injection pressure based on calculated hydraulic gradients to avoid flooding and compensate for dynamic damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-pressure water injection is used, then energy consumption is reduced, but water injection effectiveness deteriorates (cannot effectively crack coal seam)
Solution Approach 1:
The patent pre-calculates the interval hydraulic gradient before water injection and uses it to determine the optimal injection pressure. This preliminary action allows the system to start with the correct pressure setting, avoiding the need for trial-and-error adjustments and ensuring effective water injection from the beginning while maintaining energy efficiency.
Solution Approach 2:
The patent implements real-time monitoring of water injection pressure and flow rate, using this feedback to dynamically adjust injection parameters. The system continuously compares actual injection effects with target values and modifies pressure accordingly, ensuring both effectiveness and energy efficiency throughout the injection process.
2Reliability
If high-pressure water injection is used, then water injection effectiveness is improved, but water flooding occurs
Solution Approach 1:
The patent pre-calculates the interval hydraulic gradient and uses it to determine the precise injection pressure threshold before beginning water injection. This allows the system to establish the correct pressure setting in advance, ensuring effective coal seam cracking while preventing excessive pressure that would cause water flooding.
Solution Approach 2:
The patent employs real-time monitoring of injection pressure and flow rate with automatic adjustment capabilities. When approaching the critical pressure threshold that could cause flooding, the system automatically reduces pressure through feedback control, maintaining effective injection while preventing harmful flooding effects.
3Manufacturing precision
If stable pressure water injection system is used, then water injection pressure control is improved, but device complexity increases
Solution Approach 1:
The patent uses the natural hydraulic gradient of the coal seam interval to self-regulate water injection pressure. By aligning injection pressure with the pre-calculated hydraulic gradient, the system leverages the coal seam's own characteristics to maintain optimal pressure without requiring complex active pressure control mechanisms.
Solution Approach 2:
The patent changes the control parameter from active pressure regulation to passive gradient-based pressure setting. Instead of using complex pressure control systems, the method uses the pre-calculated interval hydraulic gradient as the control parameter, simplifying the system while maintaining precise pressure control through proper parameter selection.
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
The method effectively controls water injection pressure, reduces construction workload, and enhances the wetting radius of coal seam water injection, improving disaster prevention by minimizing power and energy losses.
Implementation Method 1
coal seam interval hydraulic gradient calculation
Data Source
AI summary
Provided is a method for bedding precise pressurized water injection based on coal seam interval hydraulic gradient calculation, including: setting pressure measurement boreholes on both sides of a water injection borehole with the water injection borehole as the center, and installing monitoring devices to measure internal stress of the pressure measurement boreholes in real time; during the coal seam water injection process, real-time pressure changes are obtained to determine the along-the-path dynamic damage of the pressurized water; according to the pressure difference changes within different water injection radius ranges and the pressure change nodes of the pressure measurement boreholes, during a water injection process in the same coal seam, the coal seam water injection pressure should be increased in a timely manner at the corresponding time nodes. The method of the present disclosure can effectively avoid the phenomenon of water flooding caused by excessive initial pressure during water injection.