Horizontal Wireline Core Drilling Rig Pipe Management
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Solution Overview
Problem
Current steel-strand core drilling rigs for long-distance horizontal core drilling face challenges such as large storage requirements for long steel strands, occupying space, and time-consuming auxiliary operations due to multiple round trips and frequent engagement/disengagement with the spearhead.
Innovation Solution
A long-distance core drilling method utilizing a horizontal wireline core drilling rig with a pipe-straightening mechanism, pipe-feeding mechanism, washing pump, power head, thrust cylinder, rotating chuck, and gripper, which allows for efficient steel-pipe string management and reduced auxiliary operations by enabling one round-trip fishing mechanism per core tube operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long steel strand is used to meet long-distance core drilling requirements, then the drilling distance is sufficient, but a large storage rack is needed which occupies large tunnel area and hinders coring operations
Solution Approach 1:
The steel strand is divided into multiple steel pipe sections that can be connected together. Each section is stored separately in compact segments rather than requiring one long continuous strand, significantly reducing the storage space needed while still achieving the required drilling depth through sectional connection
Solution Approach 2:
The storage approach transitions from horizontal winding (occupying large area) to vertical stacking or compact sectional storage. The steel pipes are stored in a multi-dimensional arrangement that minimizes footprint while maintaining accessibility for drilling operations
2Productivity
If the steel strand is output and recovered multiple times in one round trip operation, then the core tube can be retrieved, but the fishing device needs to be engaged and disengaged multiple times which makes auxiliary operation time-consuming
Solution Approach 1:
The fishing device is pre-positioned and pre-engaged with the spearhead before the drilling operation begins. This preliminary setup eliminates the need for repeated engagement and disengagement during the drilling process, reducing auxiliary operation time and improving overall productivity
Solution Approach 2:
The fishing device remains continuously engaged with the spearhead throughout the entire drilling operation, maintaining a continuous useful action rather than repeatedly disengaging and re-engaging. This continuity eliminates idle time and auxiliary operations, significantly improving coring efficiency
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
The method significantly reduces working time, enhances drilling efficiency, and improves coring rates, making it suitable for narrow spaces like tunnels with minimal auxiliary work time and high coring efficiency.
Implementation Method 1
a piston rod of the thrust cylinder is configured to drive the power head to move on the slide rail by extension and contraction
Implementation Method 2
A water outlet of the washing pump is communicated with the inner cavity of the active drill rod through a rotating water-supply device
Data Source
AI summary
A long-distance core drilling method suitable for a horizontal geological core drilling rig. (1) An active drill rod is connected to a drill rod, which is connected to a wireline-coring outer-tube drilling tool. (2) A steel-pipe string is connected to a fishing device, and the fishing device is connected to a spearhead on a core tube, which is placed to a designated position through a pipe-feeding mechanism. (3) A washing pump is started. (4) A core drilling is carried out. (5) A core is pulled out. (6) The steel-pipe string and the fishing device are reconnected. (7) The core tube is salvaged. (8) The core tube and drill pipe are replaced. (9) A hole is swept. (10) Steps (1)-(9) are repeated until the hole is drilled to a designated depth. (11) The core tube and the wireline-coring outer-tube drilling tool are recovered.