Differential Pressure Actuation for Downhole Milling Travel Time
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Solution Overview
Problem
Current downhole milling processes in the oil and gas industry are slow due to long travel times of milling tools between plugs, especially when dealing with significant distances, leading to increased mill and travel times over the course of operations.
Innovation Solution
A tool connected to a tubing string featuring a housing with axial and piston-driven flow passages, allowing for fluid communication to be selectively blocked or allowed, enabling efficient agitation by altering fluid flow to transition the piston between positions and enhance milling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If milling tools are extended long distances down the wellbore to reach deep plugs, then the ability to access deep plugs is improved, but the travel time between plugs increases significantly
Solution Approach 1:
The patent employs periodic reciprocating motion of the milling tool through differential pressure actuation. The piston alternately blocks and opens flow passages to create periodic pressure differentials that drive the tool back and forth, enabling the tool to reach deep plugs without requiring continuous long-distance travel, thus reducing overall travel time while maintaining access capability
Solution Approach 2:
The patent uses differential pressure actuation through a piston mechanism that controls fluid flow passages. By alternately blocking and opening flow passages, the system creates hydraulic pressure differentials that drive the piston reciprocating motion, enabling the milling tool to move long distances efficiently without continuous mechanical propulsion
2Adaptability or versatility
If the milling tool travels significant distances between plugs, then all plugs can be removed, but the mill time and travel time increase over the course of the well
Solution Approach 1:
The patent transforms the static milling tool into a dynamic system with reciprocating motion capability. The piston mechanism enables the tool to actively move back and forth along the wellbore, adapting its position to access multiple plugs at different depths, thereby maintaining versatility while improving operational speed through controlled motion rather than passive dragging
3Productivity
If differential pressure actuation is used to reduce travel time, then productivity is improved, but device complexity increases due to additional flow passages and piston mechanism
Solution Approach 1:
The patent integrates multiple functions into a single compact piston assembly. The same piston mechanism that controls flow passage blocking also serves as the actuator for reciprocating motion, and the housing structure provides both mechanical support and fluid flow pathways. This multi-functionality reduces overall device complexity while maintaining the productivity benefits of differential pressure actuation
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 reduces travel time between milling operations by generating a differential pressure similar to that created by the milling motor, even when the motor is off, thereby improving the efficiency and consistency of milling processes.
Implementation Method 1
the piston is transitionable between the first and second positions by alternately introducing or increasing fluid flow to the housing via the housing inlet and ceasing or decreasing the fluid flow to the housing via the housing inlet
Data Source
AI summary
An improved downhole tool for use in wellbores. In some embodiments, the tool has a first position wherein fluids entering the tool can exit via two or more flow passages, and a second position wherein some of the two or more flow passages are blocked such that fluids in the tool exit via the remaining unblocked flow passages. In other embodiments, the tool has a first position wherein fluids entering the tool are directed to some of the two or more flow passages, and a second position wherein fluids entering the tool are directed to the remaining flow passages. The tool is transitionable between the first and second positions by alternately ceasing or decreasing fluid flow to the tool and introducing or increasing fluid flow to the tool.