Horizontal Borehole Drilling with Pneumatic Cuttings Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing underground boring systems face challenges with the weight and frictional resistance of long augers, and the environmental hazards associated with drilling fluids, particularly in sensitive habitats or waterways, where the inadvertent return of drilling lubricants can be harmful.
Innovation Solution
A method and apparatus that utilize a cutter head and a casing with a cutting passage and an air passage to discharge cuttings using pressurized air, reducing the need for drilling fluids and minimizing the length and weight of the auger by using a casing with a smaller rear diameter section, thereby reducing friction and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If drilling fluids are used to facilitate cutting and removal of cuttings, then the cutting process is facilitated, but environmental hazards arise particularly in sensitive habitats or waterways
Solution Approach 1:
The patent extracts and eliminates drilling fluids from the system by using compressed air as the sole medium for cutting facilitation and cuttings removal. The compressed air system includes air passages in the cutter head and casing that deliver pressurized air to the cutting zone and transport cuttings to the surface without any liquid drilling fluids, thereby removing the source of environmental contamination.
Solution Approach 2:
The patent applies pneumatic principles by using compressed air instead of hydraulic drilling fluids. The system utilizes pressurized air delivered through air passages to facilitate the cutting process and remove cuttings, replacing the traditional hydraulic fluid-based system with a pneumatic one that eliminates environmental hazards associated with fluid discharge.
2Productivity
If long augers are used to remove cuttings from long boreholes, then cuttings removal is achieved, but weight and frictional resistance increase substantially
Solution Approach 1:
The patent extracts and removes the traditional long auger from the system. Instead of using a mechanical auger that extends the full length of the borehole, the invention uses compressed air delivered through the casing to transport cuttings to the surface. This eliminates the need for a long, heavy auger while maintaining effective cuttings removal capability.
Solution Approach 2:
The patent applies pneumatic principles to replace the mechanical auger system. Compressed air is used as the transport medium to move cuttings through the casing to the surface, eliminating the need for a long mechanical auger and its associated weight and friction problems.
3Power
If a reduced diameter casing is used to drive rotation of the cutting head, then rotation is facilitated, but the casing must be precisely fitted
Solution Approach 1:
The patent introduces an intermediary air passage system between the casing and the cutting head. The air passages are formed in the cutter head and casing, allowing compressed air to flow through them to facilitate cutting and cuttings removal. This intermediary pneumatic system allows for some tolerance in the casing fit while still achieving effective rotation and cutting performance.
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
This solution efficiently removes cuttings without drilling fluids, minimizing environmental harm and reducing borehole length, which leads to cost savings and allows for drilling closer to obstacles, while also reducing friction and the need for lengthy augers.
Implementation Method 1
moving pressurized air rearwardly through a cutter head air passage formed in the cutter head and a casing cuttings passage formed in the casing to discharge cuttings created by the cutter head out of a rear end of the casing
Data Source
AI summary
An apparatus and method for drilling an underground borehole is presented, wherein pressurized air may be used to discharge out of the borehole cuttings created by a cutter head. A casing may be secured to the cutter head such that the cutter head and casing may be rotatable together as a unit. The casing may have larger and smaller diameter sections. An auger may be disposed adjacent the front of the casing.