Lubricator Valve Flip-Flap Arm Debris Management
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Solution Overview
Problem
Conventional lubricator valves face issues with debris accumulation, incomplete pressure testing due to lack of bi-directional sealing, and reliance on torsion springs for flapper closure, which can fail if damaged.
Innovation Solution
The design incorporates two independently controllable flapper-type safety valves with a rotational flip-flap arm for the upper valve and an integrated poppet-style pressure equalizing valve for the lower valve, allowing bi-directional pressure testing and ensuring the flappers open downward to prevent debris obstruction, with a mechanism to securely close the upper flapper for bi-directional sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flapper valves open upward from closed position, then valve closure is achieved, but debris accumulation on flapper top prevents opening
Solution Approach 1:
The flapper valve is designed to open downward instead of upward. The hinge mechanism allows the flapper to pivot from a closed position where it seals against the valve seat, to an open position where it swings downward. This inversion ensures that debris cannot accumulate on the top surface of the flapper to prevent opening, as the opening motion naturally sheds debris downward.
2Device complexity
If single flapper valve is used, then device complexity is reduced, but bi-directional pressure testing capability is lost
Solution Approach 1:
The valve system is divided into two independent flapper valves: an upper flapper valve and a lower flapper valve. Each flapper can be independently opened or closed to enable different testing configurations. The upper flapper tests pressure from above, while the lower flapper tests pressure from below, providing bi-directional pressure testing capability.
Solution Approach 2:
The valve system dynamically configures its sealing configuration by independently controlling the upper and lower flappers. During operation, the flappers can be positioned in different states (both closed, upper open/lower closed, upper closed/lower open, both open) to adapt to different pressure testing requirements from above or below the valve.
3Device complexity
If torsion spring alone closes flapper, then mechanism simplicity is maintained, but closure reliability fails when spring is damaged
Solution Approach 1:
A second torsion spring is introduced as an intermediary closure mechanism. The first torsion spring provides primary closure force, while the second torsion spring acts as a backup or reinforcement mechanism. If either spring fails or is damaged, the other can still maintain adequate closure force to ensure the flapper remains sealed, thereby improving overall system reliability.
4Reliability
If flapper secures in closed position, then bi-directional sealing is achieved, but mechanism complexity increases
Solution Approach 1:
The flapper valve design allows the flapper to self-secure in the closed position through its hinge mechanism and spring biasing. When pressure is applied, the flapper naturally seals against the valve seat, and the torsion springs maintain the closed position without requiring additional active locking components. The geometry of the hinge and seat arrangement provides inherent stability in the closed state.
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 configuration enables reliable and safe pressure testing from both directions, reducing the risk of debris-related issues and ensuring proper closure of flapper valves, even if debris accumulates, and provides a secure mechanism for maintaining the upper flapper in a closed position for effective bi-directional sealing.
Implementation Method 1
any debris that has accumulated on the axial top of the flapper valve element will be dropped off of the flapper element as it opens
Implementation Method 2
the flapper valves within the lubricator valve will fail to close properly
Data Source
AI summary
An improved lubricator valve arrangement for use within a wellbore to allow the passage of tools, such as perforating guns and the like, into the wellbore while it is live. The inclusion of two, independently controllable flapper-type safety valves within the lubricator valve will permit coordinated testing of fluid pressure both above and below the lubricator valve. The upper flapper valve includes a rotational flip-flap arm arrangement to positively open and close the upper flapper valve. The lower flapper valve is equipped with an integrated poppet-style pressure equalizing valve to allow the lower flapper valve to be opened more easily. The direction of opening of the flapper valves precludes or reduces the risk debris-related problems that might prevent or hinder opening of the flapper valves.