Deep Wellbore Drilling for Solid Resource Extraction
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Solution Overview
Problem
Current coal mining methods are environmentally damaging, costly, and limited in depth, with strip mining causing significant environmental issues and conventional mining methods restricted to shallow depths, while oil and gas recovery techniques do not efficiently extract coal due to narrow wellbores and single-hole extraction.
Innovation Solution
A method utilizing modified oil and gas drilling tools to create horizontal access holes and lateral holes at varying depths, allowing for the extraction of solid natural resources from deep formations with minimal environmental impact, using a drill bit, reamer, and plugging materials to maximize resource extraction and waste disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If strip mining is used to recover surface coal reserves, then coal can be extracted from shallow depths, but significant environmental damage occurs and reclamation costs are high
Solution Approach 1:
The patent transitions from surface-level strip mining to deep vertical drilling, changing the spatial dimension of extraction. By drilling vertical wells to access coal seams at depths of 1,500 to 12,000 feet, the method avoids surface environmental damage while maintaining extraction productivity through subsurface access points
Solution Approach 2:
The patent extracts only the necessary access points (vertical wellbores) rather than removing large surface areas. The drilling method creates minimal surface disturbance by extracting small diameter holes to reach deep coal reserves, eliminating the need for extensive land removal and reclamation
2Length of stationary object
If shaft mines are used to access deeper coal reserves, then mining depth is increased, but the process remains dangerous and environmentally scrutinized
Solution Approach 1:
The patent replaces traditional mechanical shaft mining systems with drilling technology adapted from oil and gas industries. This substitution enables deeper access (up to 12,000 feet) using rotational drilling mechanisms rather than mechanical excavation, reducing surface disruption and improving safety by avoiding open pit and shaft exposures
Solution Approach 2:
The patent applies multi-functionality by adapting drilling equipment originally designed for fluid extraction to solid coal recovery. The same drilling infrastructure and techniques used in hydrocarbon industries are repurposed for coal seam access, leveraging existing technological capabilities to achieve deep mining with reduced environmental footprint
3Length of stationary object
If conventional oil and gas drilling tools are used with narrow wellbores, then drilling depth is achieved, but coal extraction efficiency is limited
Solution Approach 1:
The patent implements dynamic wellbore sizing by initially drilling narrow pilot holes to deep formations, then progressively enlarging the wellbore diameter using expandable reamers. This dynamic adjustment allows the system to reach deep coal seams with minimal initial disturbance, then expand the extraction pathway to maximize coal recovery volume and rate
Solution Approach 2:
The patent segments the wellbore creation process into distinct phases: initial pilot hole drilling to establish depth access, followed by staged reaming operations to enlarge the borehole. This segmentation allows the system to achieve deep penetration first, then optimize extraction capacity through progressive wellbore expansion without requiring large equipment at the surface
Data Source
AI summary
A method of drilling vertical and horizontal pathways to mine for solid natural resources involves a drill bit, at least one reamer, a first plugging material, and a second plugging material; drilling a testing wellbore to a specific vertical depth with the drill bit and identifying at least one desired mining section wherein the desired mining section is associated with a corresponding vertical depth; creating a new bottom end for the testing wellbore by filling the testing wellbore up to an offset distance with the first plugging material; drilling a horizontal access hole from the new bottom end into the desired mining section with the drill bit and enlarging it with a reamer; excavating cuttings from the desired mining section through the horizontal access hole; filling the horizontal access hole with the second plugging material; and repeating the drilling, enlarging, and filling process to create a plurality of lateral holes.