Drilling Tool Percussion Generator for Hard Formations
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Solution Overview
Problem
Current rotary drilling tools are inefficient and prone to damage when drilling through formations with poor drillability, leading to high drilling costs.
Innovation Solution
A drilling tool with a percussion generator that combines rotary motion with axial reciprocating impact, transmitted to the drilling bit through a percussion assembly, enhancing the bit's ability to break up formations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotary drilling tools are used for formations with poor drillability, then the drilling process can be maintained continuously, but the drilling efficiency is low and the drilling bit is easily damaged
Solution Approach 1:
The patent combines rotary drilling and percussion drilling into a single drilling tool system. The rotary drill bit performs continuous cutting while the percussion mechanism delivers axial impact forces, merging two drilling methods to overcome the limitations of pure rotary drilling in hard formations with poor drillability.
Solution Approach 2:
The drilling tool transitions from static rotary motion to dynamic combined motion. The percussion mechanism introduces axial reciprocating motion to the rotating drill bit, creating a dynamic drilling action that adapts to hard formations by delivering intermittent impact forces during rotation.
2Productivity
If rotary drilling is used on formations with poor drillability, then the drilling operation can proceed without interruption, but the drilling cost increases due to bit damage and low efficiency
Solution Approach 1:
The patent merges rotary drilling and percussion drilling mechanisms into one integrated system, enabling the drill bit to simultaneously perform rotational cutting and axial impact. This combination increases drilling speed in hard formations while reducing bit consumption and overall drilling costs.
Solution Approach 2:
The percussion mechanism applies periodic axial impact forces to the rotating drill bit. This periodic action delivers concentrated energy bursts during rotation, increasing drilling speed and efficiency while reducing the total energy required compared to continuous rotary drilling in hard formations.
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 combination significantly increases drilling efficiency and reduces costs by rapidly breaking up formations, improving the tool's performance in challenging drilling conditions.
Implementation Method 1
an elastic member arranged in an annulus formed between the output main shaft and the outer cylinder and axially located between an upper end face of the cam hammer and a lower end face of the transmission shaft
Implementation Method 2
a cam hammer arranged around the outer wall of the output main shaft, a lower end of the cam hammer being formed with a driven tooth, which forms a conjugate set of cam teeth with a driving tooth formed on the cam anvil
Implementation Method 3
the percussion assembly is configured to generate reciprocating impact along the axial direction on the output main shaft... The impact can be transmitted to the drilling bit, which can impact on the formation
Data Source
AI summary
A drilling tool includes an outer cylinder; a power rotary shaft arranged in an inner chamber of the outer cylinder; a percussion generator arranged below the power rotary shaft, having a transmission shaft extending in the outer cylinder and can be driven by the power rotary shaft to rotate around its axis, an output main shaft engaged with a lower end of the transmission shaft so as to be driven by the transmission shaft to rotate about its axis and is movable relative to the transmission shaft along an axial direction, and an percussion assembly The percussion assembly is arranged between an annulus formed between the upper end of the output main shaft and the outer cylinder and can generate reciprocating impact along the axial direction on the output main shaft. A drilling bit connected with the output main shaft extending out of the inner chamber of the outer cylinder.