Gas Extraction Borehole Sealing Detection via Segmented Negative Pressure Sampling
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Solution Overview
Problem
Current methods for detecting the sealing quality of gas extraction boreholes in coal mines are either complex, costly, or lack accuracy in identifying air leakage positions, leading to misjudgments and inefficiencies in gas extraction processes.
Innovation Solution
A sealing quality detection device comprising a detection host, a detection pipe, a three-way pipe, and a sealing element, which uses a negative pressure injector and air-suction ports to collect gas samples at multiple points within the boreholes, allowing for precise evaluation of air leakage rates and sealing quality through a simple and reliable method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas concentration detection is performed at multiple positions in boreholes by continuously adjusting detection pipe length, then air leakage positions can be identified, but detection time becomes excessively long and detection effectiveness is seriously affected
Solution Approach 1:
The detection pipe is divided into multiple segments with adjustable lengths, allowing the detection system to access different positions in the borehole. This segmentation enables systematic sampling at multiple locations without requiring continuous adjustment of the entire detection pipe, thereby reducing detection time while maintaining comprehensive coverage for accurate air leakage identification
Solution Approach 2:
The detection pipe is pre-configured with multiple fixed positions and sampling ports at predetermined locations along the borehole. This preliminary arrangement allows simultaneous or sequential detection at multiple positions without time-consuming adjustments during the detection process, significantly reducing total detection time while maintaining measurement precision
2Reliability
If air is pressed into boreholes to determine sealing quality by observing internal pressure changes, then sealing quality levels can be classified, but air leakage positions cannot be accurately analyzed
Solution Approach 1:
The detection system divides the borehole into multiple segments with dedicated sampling ports at each position. By pressurizing the borehole and then detecting gas concentration at each segmented position, the system can both classify overall sealing quality and identify specific leakage positions, resolving the contradiction between reliability and measurement precision
Solution Approach 2:
Gas concentration detection serves as an intermediary measurement that indirectly indicates both overall sealing quality and specific leakage positions. By using gas concentration as a mediator parameter, the system can infer sealing quality classification while simultaneously pinpointing exact leakage locations, eliminating the need for direct pressure observation
3Ease of operation
If water is injected into boreholes with ultrasonic detector to detect sealing quality, then detection can be performed, but operation becomes complex and ultrasonic reflection signal resolution is low
Solution Approach 1:
The system replaces complex ultrasonic detection with a simpler gas concentration-based detection method. By substituting the mechanical ultrasonic reflection principle with gas sampling and concentration measurement, the system achieves easier operation while improving detection resolution, as gas concentration measurements provide clearer and more reliable data for sealing quality assessment
Solution Approach 2:
Gas concentration serves as a more reliable intermediary parameter compared to ultrasonic reflection signals. By using gas concentration as the detection mediator, the system achieves higher measurement resolution and simpler operation, as gas concentration measurements are less affected by environmental factors and provide more consistent data for sealing quality evaluation
4Reliability
If tracer gas and gas concentration changes are used to determine sealing quality, then overall air leakage can be detected, but operation becomes complex and cost is high, and air leakage positions cannot be accurately determined
Solution Approach 1:
The system extracts and uses only the essential gas concentration measurement function, eliminating the need for complex tracer gas systems. By taking out the core detection capability and using simple gas concentration measurement at multiple positions, the system achieves reliable overall leakage detection while reducing device complexity and cost, and enables accurate position identification through systematic sampling
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 device enables accurate, quantitative evaluation of sealing quality, preventing misjudgments and improving gas extraction efficiency by determining air leakage rates and recommending appropriate treatment measures, while being easy to operate and cost-effective.
Implementation Method 1
a negative pressure injector is arranged in the detection host... a plurality of air-suction ports which are formed in a spacing manner are formed in the hollow pipe body
Data Source
AI summary
A sealing quality detection device for gas extraction boreholes includes a detection host, a detection pipe, a sealing element, and a three-way pipe. A plurality of air inlets and a plurality of exhaust ports are formed above the detection host, a negative pressure injector is arranged in the detection host, a quick joint and a control switch are also arranged on the detection host, the quick joint is used to be connected with an underground wind pipe, the underground wind pipe is connected to an underground compressed air tube, and the control switch is used for starting and switching off the negative pressure injector in the detection host. A sealing quality evaluating method for gas extraction boreholes is provided.