Regionalized Deep-Hole Methane Drainage With Adaptive Drilling
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Solution Overview
Problem
Current coal mine gas drainage technologies face challenges in ensuring reliable and efficient drainage without alternation of excavation and mining, requiring extensive engineering and high costs, with manual adjustments leading to trajectory errors and lack of permeability enhancement during drilling.
Innovation Solution
A device and method incorporating a high-pressure large-flow centralized liquid supply, while-drilling radar geological detection, deep-hole adaptive directional drilling rig, and electromagnetic transmission high-pressure sealing pipe column for real-time geological detection and hydraulic fracturing during drilling, enabling autonomous trajectory adjustment and permeability enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If through-seam borehole method is used for regional pre-drainage, then drainage coverage is improved, but engineering quantity and construction cost increase significantly
Solution Approach 1:
The patent transitions from traditional vertical or inclined boreholes to horizontal directional boreholes that extend along the coal seam. This dimensional change allows a single borehole to cover a much larger area (up to 1000m length) while requiring minimal surface infrastructure, thereby improving drainage coverage without proportionally increasing engineering complexity
Solution Approach 2:
The patent introduces a centralized liquid supply device as an intermediary system that provides both drilling fluid and fracturing fluid through a single high-pressure pipeline. This mediator eliminates the need for separate fluid supply systems at multiple borehole locations, reducing overall engineering quantity while maintaining large-scale drainage coverage
2Device complexity
If manual operation of directional drilling rig is used, then device complexity is reduced, but trajectory control precision deteriorates
Solution Approach 1:
The patent implements a feedback control system where a while-drilling measurement device continuously monitors borehole trajectory parameters and feeds this information back to the control system. The system automatically adjusts drilling parameters based on real-time feedback, achieving high trajectory precision (error < 0.5m per 100m) without requiring complex manual operation
Solution Approach 2:
The drilling system performs self-correction of trajectory deviations through automated control. The while-drilling measurement device detects position errors, and the control system automatically adjusts the drill bit orientation and drilling parameters to correct deviations, eliminating the need for constant manual intervention while maintaining high precision
3Device complexity
If drilling and fracturing are performed separately, then device complexity is reduced, but drainage effectiveness deteriorates
Solution Approach 1:
The patent merges drilling and fracturing operations into a single integrated process called hydraulic fracturing while drilling. The centralized liquid supply device delivers high-pressure fluid that simultaneously advances the borehole and creates fractures in the coal seam. This combination ensures immediate permeability enhancement during drilling, dramatically improving drainage effectiveness without requiring separate fracturing operations
Solution Approach 2:
The patent performs fracturing action preliminarily during the drilling process itself, rather than after drilling completion. The high-pressure fluid injected during drilling pre-creates fracture networks in the coal seam ahead of and around the borehole, ensuring permeability enhancement is established before the borehole reaches its final depth, thereby guaranteeing drainage effectiveness from the outset
4Area of stationary object
If multiple rock laneways are arranged for through-seam borehole construction, then drainage coverage is improved, but excavation speed and construction period worsen
Solution Approach 1:
The patent uses horizontal directional drilling to extend boreholes laterally along the coal seam dimension rather than creating multiple vertical access points. A single borehole can extend 1000m horizontally to cover an entire section, eliminating the need for multiple rock laneways and maintaining high excavation speed while achieving comprehensive section coverage
Solution Approach 2:
The centralized liquid supply device serves multiple functions: it provides drilling fluid for borehole advancement, fracturing fluid for permeability enhancement, and cooling fluid for the drill bit. This multi-functional system allows a single infrastructure to support the entire 1000m borehole construction and operation, achieving section-wide coverage without requiring multiple separate construction systems
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
Enables advanced and efficient coal mine gas drainage in large areas with reduced engineering, minimizing alternation and costs, by providing real-time geological guidance and integrated drilling and fracturing processes.
Implementation Method 1
an electromagnetic transmission high-pressure sealing pipe column (5), wherein the high-pressure and large-flow centralized liquid supply device is connected to the electromagnetic transmission high-pressure sealing pipe column (5), the electromagnetic transmission high-pressure sealing pipe column (5) is provided with a fracturing fluid channel and a drilling fluid channel, the fracturing fluid channel is connected to the open hole while-drilling segmented fracturing tool string (8), and the drilling fluid channel is connected to the screw motor (3)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed is an apparatus for regionalized coal mine methane drainage in a deep hole, comprising a high-pressure large-flow centralized liquid supply apparatus, a while-drilling radar geological detection apparatus (4), a deep-hole self-adaptive directional drilling rig apparatus, an electromagnetic transmission high-pressure sealing column (5), and an open-hole while-drilling staged fracturing tool string. The while-drilling radar geological detection apparatus continuously detects a geological formation and a coal-rock interface in real time in a drilling process; the deep-hole self-adaptive directional drilling rig apparatus adaptively adjusts a propelling force and a swivel speed on the basis of the detection result, so as to improve the drilling efficiency, and reduce the probability of drill jamming and bit balling in the drilling process; and methane control in a large area, and in particular, the design of drainage boreholes, while-drilling radar geological detection, self-adaptive drilling, staged fracturing of main boreholes, and while-drilling fracturing of branch boreholes of a weak seam can be effectively guided, so as to implement advanced and highly-efficient drainage of methane of a coal mine dominated by the weak seam in a laneless down-hole large area. Further disclosed is a method of using the apparatus.