Valve Stop Mechanism for Drilling Pressure Control
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Solution Overview
Problem
In oil and gas drilling, standard technologies face challenges in managing unbalanced pressures, leading to safety hazards due to the inability to effectively prevent well fluids from returning through the drill string, particularly when drilling fluid pressures are not balanced.
Innovation Solution
A valve mechanism comprising first and second valve seat carriers, a valve ball positioned between the valve seats, and a stop mechanism that limits the travel of the valve seats to allow the valve ball to be pushed away from sealing engagement, ensuring fluid containment and preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve seat is allowed to move freely towards the valve ball, then the sealing engagement is improved, but the valve ball cannot be pushed away from sealing engagement to prevent backflow
Solution Approach 1:
The valve seat is designed to be movable rather than fixed, allowing it to dynamically adjust its position. The stop mechanism provides a defined limit to this movement, enabling the valve seat to move toward the valve ball for sealing while preventing excessive movement that would block backflow prevention. This dynamic design resolves the contradiction by allowing controlled movement that satisfies both sealing requirements and operational control.
2Ease of operation
If the valve seat is constrained to limit travel, then the valve ball can be pushed away from sealing engagement, but the sealing engagement may be compromised
Solution Approach 1:
The stop mechanism acts as an intermediary element between the valve seat and the valve ball. It provides a controlled interface that allows the valve seat to move toward the valve ball for sealing while preventing excessive movement. This intermediary structure enables both sealing engagement and backflow prevention by mediating the interaction between the movable valve seat and the valve ball.
3Reliability
If a stop mechanism is introduced to limit valve seat travel, then the device complexity increases, but the pressure balance and safety are improved
Solution Approach 1:
The valve mechanism is segmented into distinct functional components: the movable valve seat, the stop mechanism, and the valve ball. This segmentation allows each component to perform its specific function independently - the valve seat provides sealing, the stop mechanism provides movement limitation, and the valve ball provides flow control. By dividing the system into separate functional segments, the complexity is managed while achieving reliable pressure balance and safety.
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 valve mechanism effectively prevents well fluids from returning through the drill string by allowing controlled movement of the valve ball, thereby maintaining pressure balance and enhancing safety during drilling operations.
Implementation Method 1
a biasing mechanism biasing each valve seat toward the valve ball
Data Source
AI summary
In the specification and drawings, a valve is described and shown having a first and second valve seat carrier, a valve seat associated with each valve seat carrier, and a valve ball between the valve seats. The valve further includes a stop mechanism operatively connected to at least a first valve seat, the stop mechanism limiting travel of the first valve seat towards the valve ball such that the valve ball may be push away from a sealing engagement with the first valve seat.