Multi-Barrier Downhole Valve System for Redundant Fluid Containment
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Solution Overview
Problem
In the downhole drilling and completion industry, existing systems for containing formation fluids lack redundancy and fail-safe mechanisms to ensure effective fluid containment during operations, particularly when the Electric Submersible Pump (ESP) is pulled from the downhole environment.
Innovation Solution
A multi-barrier system comprising two valves in fluidic communication with a lower completion, operated by a member that can be positioned in four distinct states to control fluid flow, ensuring redundant sealing upon retrieval of the upper completion, with one valve closing before the other to prevent hydraulic lock conditions and allow independent testing of each valve's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single valve is used to contain formation fluid, then the system is simpler, but the reliability and fail-safe capability are insufficient
Solution Approach 1:
The single valve is segmented into two separate valves (first valve and second valve) that operate independently. Each valve can be tested and controlled separately, providing redundant containment paths. This segmentation increases reliability by ensuring that if one valve fails, the other can still contain the formation fluid.
Solution Approach 2:
The system incorporates fail-safe mechanisms that activate automatically upon detection of valve failure or during upper completion retrieval. The second valve serves as a backup containment barrier that can be closed beforehand or in response to failure conditions, cushioning against potential fluid leakage scenarios.
2Reliability
If both valves are closed simultaneously, then fluid containment is maximized, but hydraulic lock conditions prevent proper valve operation
Solution Approach 1:
Before closing both valves for final containment, the system performs preliminary actions by closing one valve at a time while maintaining the other open. This allows pressure equalization and prevents hydraulic lock conditions that would occur if both valves were closed simultaneously. The staged closing sequence ensures proper operational control.
Solution Approach 2:
The valve closing operation is made dynamic and sequential rather than static and simultaneous. The control system dynamically adjusts the closing sequence, allowing one valve to remain open as a pressure relief path while the other closes. This dynamic operation prevents hydraulic lock and maintains ease of operation throughout the containment process.
3Measurement precision
If valves are tested independently, then sealing integrity is verified, but the system requires additional operational steps
Solution Approach 1:
The system performs partial testing by testing each valve independently in sequence rather than requiring simultaneous testing of both valves. This partial action approach allows verification of each valve's sealing integrity through the member's four positions, achieving thorough measurement while managing the time required through efficient sequential operation.
Data Source
AI summary
A multi-barrier system includes a first valve and a second valve that are both in fluidic communication with a lower completion. The first valve and the second valve are positioned proximate an uphole extent of the lower completion, and a member in operable communication with the first valve and the second valve. The system is configured such that both the first valve and the second valve are open when the member is in a first position, the first valve is closed and the second valve is open when the member in a second position, the first valve is open and the second valve is closed when the member is in a third position, and the first valve and the second valve are both closed when the member is in a fourth position. The first valve and the second valve are closable in response to retrieval of an upper completion.