Sealed Coalbed Coring Device for Methane Loss Control
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Solution Overview
Problem
Existing coalbed methane sampling technologies are inefficient, prone to methane loss, and provide inaccurate data due to structural complexity and fluid media pollution, affecting the accuracy and timeliness of coalbed methane content and pressure measurements, which hinders effective risk evaluation and engineering guidance in coal mining.
Innovation Solution
A sealed coring device with a rib drill pipe assembly, motor cylinder, and sampling cylinder assembly, featuring multi-layer sealing, sensors, and remote monitoring, allowing simultaneous drilling and sampling without replacing drill bits, and ensuring constant air pressure and reduced methane leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open or ball valve closed coring technology is used, then the device structure is simple, but methane loss occurs and measurement timeliness is low
Solution Approach 1:
The coring device is divided into multiple sealed segments including a sealed coring head, sampling cylinder, and multiple sealing components (sealing rings, sealing plates). Each segment contributes to the overall sealing system, allowing the device to maintain structural simplicity while achieving reliable methane containment through distributed sealing points throughout the coring and sampling system.
2Reliability
If fluid media are introduced into the coring device, then pressure-maintaining coring is achieved, but pollution to coalbed cores occurs and water content determination is influenced
Solution Approach 1:
The device creates an inert sealed environment within the sampling cylinder that maintains coalbed pressure without introducing contaminating fluid media. The sealed coring head and sampling cylinder form an isolated system where coal samples are collected and preserved in their original state, eliminating pollution from water or other fluids while maintaining pressure through the sealed structure itself.
3Adaptability or versatility
If different accessories are used to cut different coalbeds, then various coalbed types can be processed, but the operation becomes uneasy and work efficiency is low
Solution Approach 1:
The sealed coring head is designed as a universal component that can process different coalbed types without requiring accessory changes. The coring head incorporates adjustable parameters and a versatile cutting mechanism that adapts to various coalbed characteristics through parameter adjustment rather than physical component changes, enabling one device to handle multiple coalbed types while maintaining ease of operation.
4Ease of operation
If rope-based lifting and compressed air or water pressure driving are used, then the coring device can be operated, but coring efficiency is low and operation is complex
Solution Approach 1:
The device replaces traditional rope-based mechanical lifting with a more efficient driving mechanism. The coring head and sampling cylinder are equipped with integrated driving components that eliminate the need for external rope operations, and the system uses controlled pressure differentials rather than compressed air or water pressure, resulting in faster operation and higher coring efficiency while maintaining ease of operation.
Data Source
AI summary
The sealed coring device for an underground coalbed comprises a rib drill pipe assembly, a tail bearing pack, a motor cylinder assembly and a sampling cylinder assembly. The rib drill pipe assembly consists of a rib drill pipe, a tail drill pipe joint and a head drill pipe joint. The tail bearing pack is mounted in the tail drill pipe joint and configured for protecting an internal structure from relatively rotating during drilling of the rib drill pipe, so that the stability of the sampling cylinder is ensured. The motor cylinder assembly is mounted in the rib drill pipe and configured for providing power for action of a center shaft in the sampling cylinder assembly.