Sealed Horizontal Directional Drilling Continuous Coring Device
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Solution Overview
Problem
Traditional vertical drilling methods face challenges in long and large tunnel projects, failing to provide adequate stratigraphic information for engineering design, and horizontal directional drilling lacks the capability for core extraction, limiting its application in geological surveys.
Innovation Solution
A sealed pressured horizontal directional drilling continuous coring device combining guiding and coring, featuring an outer and inner tube assembly with advanced mechanisms for precise direction control, core extraction, and pressure-feeding, including a bullet positioning mechanism, in-place reporting, core blockage alarm, and sealing components to ensure efficient and accurate coring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional vertical drilling method is used, then core extraction capability is available, but directional control accuracy deteriorates and applicability to long tunnel projects is limited
Solution Approach 1:
The patent combines the directional control capability of horizontal directional drilling with the core extraction capability of traditional core drilling by integrating a core tube into the horizontal directional drilling tool, creating a unified device that performs both functions simultaneously
Solution Approach 2:
The drilling device is designed with multi-functionality, enabling it to perform both directional drilling and continuous core extraction in a single operation, making it applicable to various geological investigation scenarios including long tunnel projects
2Measurement precision
If horizontal directional drilling is used, then directional control accuracy improves, but core extraction capability is lost
Solution Approach 1:
The patent merges the core tube from traditional core drilling with the horizontal directional drilling tool, allowing the drill to both steer accurately and extract continuous core samples through the same borehole
Solution Approach 2:
The core tube is nested within the horizontal directional drilling tool structure, with the core tube positioned inside the drill pipe assembly, allowing it to be transported to the drilling location and deployed for core extraction without compromising the directional control system
3Productivity
If core tube is lifted out by fisher with rope, then core extraction is achieved, but drilling efficiency deteriorates due to frequent lifting and lowering
Solution Approach 1:
The patent enables continuous coring by allowing the core tube to remain in place and continuously extract core material as the drill advances, eliminating the need to stop drilling for frequent core tube retrieval and replacement
Solution Approach 2:
The patent replaces the rope-based fisher lifting system with a pressure-driven system where drilling fluid pressure feeds the core tube forward continuously, eliminating the mechanical lifting and lowering operations that caused time losses
4Productivity
If traditional core drilling is used, then core extraction rate is moderate, but drilling efficiency deteriorates due to frequent operations
Solution Approach 1:
The system maintains continuous core extraction operation throughout the drilling process, with the core tube continuously filling with core material and being pressure-fed forward without interruption, significantly improving both efficiency and extraction rate
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 accurate directional control and efficient core extraction in horizontal drilling, overcoming the limitations of traditional methods by using pressure-feeding and non-magnetic materials for precise guidance and sealing, facilitating continuous coring and improved drilling efficiency.
Implementation Method 1
a first sealing component and a second sealing component, wherein the first sealing component is located in the single-wall drill pipe and the second sealing component is located in the dual-wall drill pipe assembly
Implementation Method 2
uses sealed pressure-feeding components, and uses the principle of mud pressure-feeding to push the coring device of the inner tube assembly
Data Source
AI summary
A sealed pressured horizontal directional drilling continuous coring device for engineering geological investigation includes an outer tube assembly and an inner tube assembly matching the outer tube assembly. The outer tube assembly includes a single-wall drill pipe and a dual-wall drill pipe assembly. The inner wall of the dual-wall drill pipe assembly is sequentially provided with a bullet stop head, a bullet room, a suspended seat ring, a positioning inner lock, a positioning outer lock, a first centralizing ring, a lock ring seat and a drill from top to bottom. The inner tube assembly includes a spear head, a first sealing component, a bullet positioning mechanism, a recovery pipe, a second sealing component, an in-place reporting mechanism, a core blockage alarm mechanism, a single-action mechanism, a guiding mechanism, a buffer mechanism, an adjustment mechanism, a core tube and a core clamping mechanism.