Fiber-Reinforced Borehole Lining for Continuous Drilling
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Solution Overview
Problem
Conventional deep drilling methods result in a discontinuous drilling process due to frequent drill bit replacements and require a time-consuming, multi-stage casing process with decreasing borehole diameters, which is not advantageous for all applications.
Innovation Solution
A method using a fiber-reinforced hybrid material, such as carbon fibers and concrete, is applied directly to the borehole wall after drilling, allowing for a continuous lining process with a substantially constant borehole diameter, facilitated by a borehole lining module with spray nozzles and a reinforcement fabric laying device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-stage casing with decreasing pipe diameters is used to line the borehole, then the borehole is securely supported and protected from collapse, but the lining process becomes very time-consuming and the borehole diameter continuously decreases
Solution Approach 1:
The borehole lining is divided into multiple sections, each lined independently with fiber-reinforced material. This allows continuous lining without requiring complete withdrawal and replacement of the entire lining system, significantly reducing the time required while maintaining borehole stability throughout the drilling process
Solution Approach 2:
The invention changes the material parameters from traditional metal casing to fiber-reinforced hybrid material (such as carbon fibers and concrete). This material transformation enables the lining to maintain structural integrity and support stability while allowing constant borehole diameter and reducing the time-consuming multi-stage casing process
2Strength
If traditional metal casing is used for borehole lining, then the borehole is securely supported, but the process requires multiple stages with decreasing diameters and is very time-consuming
Solution Approach 1:
The invention uses fiber-reinforced hybrid materials combining carbon fibers with concrete or plastic matrices. This composite material provides equivalent or superior strength and support capability compared to traditional metal casing, while enabling a more efficient continuous lining process that maintains constant borehole diameter and improves overall drilling productivity
Solution Approach 2:
The lining process continues uninterrupted during drilling operations. The fiber-reinforced material is applied continuously to the borehole wall as drilling progresses, eliminating the discontinuous stop-start nature of traditional multi-stage casing installation and significantly improving drilling productivity
3Productivity
If drill bit replacement is performed frequently to maintain drilling efficiency, then the drilling process can continue, but the entire drill string must be pulled out and disassembled, resulting in discontinuous drilling
Solution Approach 1:
The fiber-reinforced lining is installed in advance and remains in place throughout the drilling process. This preliminary lining protects the borehole wall and provides a stable environment that allows drill bits to be replaced or refurbished without requiring complete drill string withdrawal, enabling more efficient bit maintenance and continuous drilling operations
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 a quick and continuous borehole lining process with a constant diameter, reducing downtime and improving efficiency by allowing the drilling and lining to be performed continuously without the need for frequent drill bit replacements or multiple casing stages.
Implementation Method 1
the curing medium be sprayed onto the fiber material. The spraying process ensures uniform and rapid wetting of the fiber material with the curing medium
Implementation Method 2
Carbon fibers and concrete are preferably used to form this hybrid material, which serves to line the borehole wall and consists of a reinforcing fiber and a hardening medium
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for lining boreholes for deep bores. A lining method, which makes a rapid process sequence possible with a substantially uniform borehole diameter, is characterized, according to the invention, in that the borehole (5) is lined directly after boring with a hybrid material consisting of a fibrous material and a hardenable medium. The invention also relates to a device for carrying out the method.