Convertible Downhole Valve Bi-Directional to Unidirectional Switch
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Solution Overview
Problem
Existing oilfield downhole valve systems require unidirectional float valves for cementing operations, but these valves hinder the running-in of the casing string without floating, necessitating a convertible valve that can switch from bi-directional to unidirectional configuration.
Innovation Solution
A convertible valve assembly with plunger-type upper and lower valves, maintained in a bi-directional configuration during run-in by a retainer device, which releases to convert the valves to a unidirectional configuration using a shear pin mechanism and occluding device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unidirectional float valve is used for cementing operations, then fluid flow control is improved, but the running-in of the casing string is hindered
Solution Approach 1:
The valve assembly dynamically changes its flow direction capability from bi-directional during run-in to unidirectional during cementing operations. The retainer device holds the plunger valves in an open bi-directional position during run-in, then releases them to allow automatic conversion to unidirectional flow control when needed for cementing.
2Ease of operation
If a bi-directional valve configuration is used during run-in, then ease of operation is improved, but fluid flow control during cementing is compromised
Solution Approach 1:
The valve assembly transitions from a static bi-directional configuration to a dynamic system that can convert to unidirectional flow control. The retainer device and shear pin mechanism enable automatic conversion from bi-directional (during run-in) to unidirectional (during cementing) configuration based on operational phase.
3Adaptability or versatility
If a convertible valve mechanism is added to switch configurations, then versatility is improved, but device complexity increases
Solution Approach 1:
The valve assembly performs self-conversion from bi-directional to unidirectional configuration through automatic triggering mechanisms. The shear pin breaks under specific conditions (such as weight or pressure thresholds), automatically releasing the retainer device and converting the valve configuration without requiring external intervention or complex control systems.
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
Enables the casing string to be run in without floating, while ensuring fluid flow during cementing operations by converting the valve assembly from bi-directional to unidirectional, preventing backflow and facilitating efficient drilling and cementing processes.
Implementation Method 1
A convertible valve assembly with plunger-type upper and lower valves, maintained in a bi-directional configuration during run-in by a retainer device, which releases to convert the valves to a unidirectional configuration using a shear pin mechanism
Data Source
AI summary
A convertible valve assembly has an upper and lower plunger valve connected to one another so that they reciprocate together. A retainer assembly holds the valves in a bi-directional configuration, allowing fluid flow in both directions through the valves. The retainer assembly then releases the valves to a unidirectional configuration upon application of a downhole hydraulic pressure, so that fluid can flow only one direction through the valve assembly.