Chemical Injection Valve Bypass Flow for Seal Erosion Control
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Solution Overview
Problem
Existing chemical injection valves in subterranean wells face challenges in maintaining consistent and predictable control over chemical treatment injection, leading to potential wastage and erosion of seals, which affects the longevity and efficiency of the injection process.
Innovation Solution
A chemical injection valve design featuring a valve stem with a resilient primary seal and a metal secondary seal, along with bypass passages, which allows for controlled flow and reduces seal erosion by adjusting the pressure differential and using friction-reducing materials to maintain consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a chemical injection valve is used to control chemical treatment injection, then injection control is achieved, but seal erosion occurs and seal longevity is reduced
Solution Approach 1:
The valve stem is divided into multiple functional sections: an upper stem section, a lower stem section, and a bypass flow section. This segmentation allows different portions of the stem to serve different purposes - the upper section controls sealing, the lower section manages flow, and the bypass section reduces erosion by diverting fluid away from the seal interface.
Solution Approach 2:
A bypass passage acts as an intermediary flow path that diverts chemical treatment fluid away from the seal interface. This intermediary channel reduces direct contact between the erosive chemical fluid and the seal, thereby extending seal longevity while maintaining injection control functionality.
2Reliability
If pressure differential is increased to maintain valve in closed position, then sealing is improved, but operational stress and seal erosion increase
Solution Approach 1:
The valve stem incorporates a dynamic bypass mechanism that adjusts fluid flow paths based on operating conditions. The bypass passage becomes active under certain pressure differentials to relieve stress on the seal, allowing the system to adapt between high-sealing and low-stress states rather than maintaining constant high pressure on the seal.
Solution Approach 2:
The bypass passage creates a secondary, lower-stress flow path that copies the function of the main flow path while relieving pressure from the seal interface. This alternative path allows the seal to maintain sealing effectiveness without bearing the full operational stress of the chemical treatment fluid.
3Device complexity
If valve stem directly controls flow without bypass, then结构简单 (structure is simple), but seal erosion increases and control consistency decreases
Solution Approach 1:
The valve stem is divided into multiple functional sections: an upper stem section, a lower stem section, and a bypass flow section. This segmentation allows different portions of the stem to serve different purposes - the upper section controls sealing, the lower section manages flow, and the bypass section reduces erosion by diverting fluid away from the seal interface.
Solution Approach 2:
The valve stem serves multiple functions simultaneously: it acts as a sealing element, a flow control element, and a structural support. The bypass passage integrated into the stem structure provides erosion protection while maintaining the compact design, making the single component perform multiple critical functions.
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 design enhances control over chemical treatment injection, reduces seal erosion, and ensures predictable and efficient operation by allowing controlled flow and minimizing pressure required to maintain the valve in open or closed positions, thereby improving the longevity of the valve and reducing wastage.
Implementation Method 1
a resilient primary seal prevents flow through an annular gap between the valve stem and the housing
Implementation Method 2
When the valve stem is in the open position, flow of the chemical treatment from the first flow passage section to the second flow passage section is permitted
Data Source
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AI summary
A chemical injection valve can include a valve stem, flow between sections of a flow passage being prevented and permitted in respective closed and open positions of the valve stem, a resilient primary seal that prevents flow through an annular gap surrounding the valve stem in the closed position, and a bypass passage in communication with the annular gap and a flow passage section, and in communication with another flow passage section in the open position. A chemical injection system can include a chemical treatment pumped through a chemical injection valve and into an interior of a tubular string, and the chemical injection valve including a valve stem and a bypass passage extending between a flow passage section and an annulus surrounding the valve stem, the annulus being positioned longitudinally between a resilient primary seal and a metal secondary seal.