Dual-Closure Drill Pipe Float Valve for Reverse Flow Reliability
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Solution Overview
Problem
Existing simple float valves for drill pipes, such as BAKER piston-type valves, are prone to failure due to foreign bodies, leading to operational inefficiencies and safety risks during drilling operations, including reverse fluid flow and well control issues.
Innovation Solution
A double-closure, anti-return floating valve assembly with a piston-type and flapper-type retention devices connected in series, ensuring reliable fluid control and reducing assembly connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple float valve (piston-type) is used, then the device complexity is reduced, but the reliability deteriorates due to foreign body interference and operational failures
Solution Approach 1:
The valve is divided into two independent closure devices (piston-type and flapper-type) that operate separately but provide complementary functions. Each device can independently perform closure, and neither device's failure prevents the other from functioning, thus resolving the contradiction by reducing reliance on a single complex mechanism while improving overall reliability through distributed functionality.
2Device complexity
If a single closure device is used, then the device complexity is reduced, but the service life deteriorates due to functional sticking and operational failures
Solution Approach 1:
The dual-closure design provides a backup mechanism that cushions against potential failures before they become critical. If one closure device fails due to foreign bodies or functional sticking, the second device remains available to maintain operation, thereby extending the overall service life of the valve assembly without requiring complex monitoring or maintenance systems.
3Reliability
If a double-closure assembly with two retention devices is used, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Two different closure mechanisms (piston-type and flapper-type) are merged into a single integrated valve assembly that operates as one unit. The devices are connected in series within the same housing, sharing common structural elements and control systems, which reduces the overall complexity increase while maintaining the reliability benefits of dual-closure functionality.
4Adaptability or versatility
If additional connections are added to assemble the Bottom Hole Assembly, then the adaptability is improved, but the productivity deteriorates due to increased assembly time
Solution Approach 1:
The valve assembly is designed with universal connection interfaces that can accommodate different drilling configurations and tool combinations. The standardized threading and mounting mechanisms allow the same valve assembly to be adapted to various Bottom Hole Assembly configurations without requiring additional custom connections, thereby maintaining versatility while improving assembly efficiency through reuse of standardized components.
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 double-closure assembly enhances operational reliability and extends service life by preventing failures and ensuring continuous fluid flow control, improving safety and efficiency in drilling operations.
Implementation Method 1
The backpressure action of the valve prevents cuttings from entering the drill pipe
Implementation Method 2
a flapper-type retention device (2) with a closure member configured to gravitationally close
Implementation Method 3
The float valve rests on a seat in the float valve housing
Data Source
AI summary
A floating valve assembly for drill pipes (C). The circulation systems contain conventional and non-conventional oil and gas drilling fluids. The assembly includes a first member device (D1) of the piston or plunger type and a second member device (D2) of the swing check type, which are integrally connected in series and arranged vertically in tandem inside the pipe.