Chemical Injection Valve Stem Bypass for Predictable Well Dosing
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Solution Overview
Problem
Existing chemical injection valves in subterranean wells face challenges in achieving 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 reduced seal erosion by directing the chemical treatment to bypass the primary seal during injection, utilizing a pressure differential to maintain consistent and predictable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If chemical treatment flows through the valve stem seal during injection, then the injection function is simple, but the seal erodes rapidly reducing longevity
Solution Approach 1:
The valve body is segmented into multiple flow passages: a first flow passage for chemical treatment injection and a second flow passage for stem bypass flow. This segmentation allows the seal to be isolated from the harmful chemical treatment flow during injection, preventing erosion and extending seal longevity while maintaining injection functionality.
2Reliability
If the valve stem directly controls chemical injection without bypass flow, then the device structure is simple, but control consistency and predictability are insufficient
Solution Approach 1:
The bypass flow passage acts as an intermediary mechanism that allows controlled flow of chemical treatment around the valve stem seal. This intermediary flow path enables consistent and predictable control over chemical injection by regulating the bypass flow, while adding only moderate structural complexity through the incorporation of additional flow passages.
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 consistent and predictable operation, thereby improving the longevity and efficiency of the chemical injection process in subterranean wells.
Implementation Method 1
bypass passages, which allows for controlled flow and reduced seal erosion by directing the chemical treatment to bypass the primary seal during injection
Implementation Method 2
utilizing a pressure differential to maintain consistent and predictable operation
Data Source
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.