Dual-Flow Auto-Fill Float Valve for Stable Mode Shifting
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Solution Overview
Problem
Existing wellbore auto-fill float valves lack efficient mechanisms to transition between auto-fill and float modes, particularly in response to varying fluid flow rates, which can lead to premature shifting due to factors like bump pressures, flow vibrations, or lost circulation materials during deployment and transportation.
Innovation Solution
A dual flow convertible auto-fill float valve (DFCAFFV) that includes a poppet movable between open and closed positions, biased by a spring, and a shifter with a drogue and detent system, allowing operation in auto-fill mode and shifting to float mode based on distinct flow rates, ensuring controlled fluid flow and cement slurry placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single flow rate threshold is used to trigger mode transition, then the valve can respond to fluid flow changes, but premature shifting occurs due to bump pressures, flow vibrations, or lost circulation materials
Solution Approach 1:
The patent introduces two distinct flow rate parameters (first flow rate for auto-fill to float mode transition, second flow rate for float to auto-fill transition) to replace a single threshold parameter. This dual-parameter approach allows the valve to differentiate between transient disturbances (bump pressures, vibrations) and genuine operational changes, enabling stable and responsive mode transitions by comparing actual flow rates against multiple predefined thresholds
Solution Approach 2:
The shifter component acts as an intermediary mechanism between the poppet and the fluid flow. It translates flow rate conditions into mechanical position changes of the poppet through the detent-drogue interaction, mediating the transition between modes while filtering out transient disturbances through the requirement of sustained flow rate conditions
2Reliability
If the valve remains in auto-fill mode during transportation, then the poppet stays in partially open position, but fluid surges can occur during deployment
Solution Approach 1:
The valve system performs self-service by automatically detecting flow rate conditions and transitioning modes without external control. The shifter-detag-drogue mechanism autonomously responds to fluid flow conditions, sensing the flow rate through the movement of the drogue and automatically adjusting the poppet position accordingly, eliminating the need for external sensors or control systems
Solution Approach 2:
The patent utilizes hydraulic principles where fluid flow directly acts on the drogue to generate mechanical force. The second flow rate creates sufficient drag force on the drogue to disengage the detent from the detent profile, converting fluid flow energy into mechanical motion to shift the valve mode, thereby controlling fluid surges through hydraulic actuation
3Reliability
If a frangible link or shear pin mechanism is used for mode transition, then the valve can transition modes, but the mechanism is complex and may fail prematurely
Solution Approach 1:
The patent replaces traditional mechanical frangible links or shear pins with a flow-driven drag force mechanism. Instead of relying on mechanical breaking or shearing, the system uses fluid flow to generate drag force on the drogue, which mechanically disengages the detent from the detent profile through controlled movement, eliminating weak mechanical links while maintaining reliable mode transition
Solution Approach 2:
The shifter mechanism incorporates dynamic elements including the movable drogue that responds to flow-induced drag forces. The detent-drogue interaction allows for controlled engagement and disengagement based on flow conditions, creating a dynamic system that adapts to operational conditions rather than relying on static mechanical breaks
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 DFCAFFV effectively mitigates premature shifting during deployment and transportation by requiring specific flow rates to transition modes, ensuring reliable auto-fill and float operations, thereby preventing fluid surges and maintaining cement slurry in the annulus.
Implementation Method 1
a second flow rate imparting a drag force on the drogue sufficient to disengage the detent from the detent profile
Implementation Method 2
a spring biasing the poppet toward the closed position
Data Source
AI summary
A flow-actuated valve for use in a wellbore includes: a body; a poppet movable relative to the body between an open position and a closed position; a spring biasing the poppet toward the closed position; and a shifter having a drogue and a detent engaged with a detent profile of the poppet and a locking receptacle of the body when in an auto-fill mode, thereby keeping the poppet in a partially open position. The valve is operable to shift to a float mode in response to a first flow rate moving the poppet toward the open position to disengage the detent from the locking receptacle and a second flow rate imparting a drag force on the drogue sufficient to disengage the detent from the detent profile. The second flow rate is different than the first flow rate.