Downhole Tool Fluid-Actuated Piston Springless Reciprocation
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Solution Overview
Problem
Current downhole drilling technologies face challenges in efficiently drilling through varying rock types, as they often require switching between percussion and conventional drilling methods, leading to increased time and costs due to the need for frequent arrangement changes and potential failure of return springs in reciprocating mass tools.
Innovation Solution
A downhole tool with a fluid-actuated piston and motor-driven valve that allows for bidirectional movement of a reciprocating mass, reducing reliance on return springs and enabling operation in both active and inactive configurations, and a drill bit with adjustable pressure profiles to suit different rock types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a return spring is used to return the piston and mass to the initial position, then the tool can operate with simpler valve control, but the reliability decreases due to potential failure of return springs in challenging downhole environments
Solution Approach 1:
The patent removes the return spring from the system entirely. Instead of using a spring to return the piston and mass to the initial position, the invention uses a valve-controlled fluid pressure system where the valve simply redirects fluid flow to achieve the return motion, eliminating the unreliable spring component from downhole operation
Solution Approach 2:
The patent replaces the mechanical return spring system with a fluid-pressure-based return mechanism. The valve controls fluid flow to create pressure differential that returns the piston and mass to the initial position, substituting mechanical spring energy with controlled fluid pressure
2Productivity
If the tool is designed for percussion drilling only, then it can provide high penetration rates in hard rock, but it cannot operate effectively in softer formations without frequent arrangement changes
Solution Approach 1:
The patent makes the drilling mode dynamic and adjustable. The tool can transition between percussion mode (for hard rock) and conventional drilling mode (for softer formations) by controlling the valve and piston system, allowing the same tool to adapt to different rock types without frequent arrangement changes
Solution Approach 2:
The patent designs the tool to perform multiple functions: it can operate as a percussion drilling tool for hard rock and as a conventional drilling tool for softer formations. The valve-controlled piston system enables the tool to switch between these modes, making it a universal drilling tool that eliminates the need for separate tools for different rock types
3Device complexity
If the piston is actuated unidirectionally only, then the structure can be simpler, but the reciprocating mass cannot be operated in both directions reducing operational flexibility
Solution Approach 1:
The patent implements periodic bidirectional action of the piston through valve control. The valve cycles between positions to alternately pressurize the piston in downward and upward directions, creating periodic reciprocating motion of the mass that can be operated in both directions for enhanced operational flexibility
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 enhances drilling efficiency by allowing seamless transitions between percussion and conventional drilling modes without the need for frequent arrangement changes, reducing wear and vibration, and maintaining reliable operation in challenging downhole environments.
Implementation Method 1
a motor-driven valve configured to supply actuating fluid sequentially to drive the piston downwards and upwards
Data Source
AI summary
A downhole tool including a fluid-actuated piston and a motor-driven valve. The fluid-actuated piston is operatively associated with a reciprocating mass. The motor-driven valve is configured to supply actuating fluid sequentially to drive the piston downwards and upwards.A method of reciprocating a mass in a downhole tool. The method including cycling a motor-driven valve between a first configuration and a second configuration. In the first configuration actuating fluid pressure drives a piston associated with the mass downwards. In the second configuration actuating fluid pressure drives the piston upwards.