Teardrop-Orifice Oilfield Choke for Erosion-Resistant Flow Control
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Solution Overview
Problem
High-pressure oilfield choke valves face erosion and corrosion issues due to sand and particles in well production fluids, leading to costly downtime as existing technologies fail to effectively manage flow rates and reduce shear forces and emulsification.
Innovation Solution
A choke valve design featuring teardrop-shaped flow orifices and an internal sliding flow control member that adjusts the alignment of these orifices to regulate flow rates, reducing shear forces and emulsification, and minimizing erosion and corrosion by optimizing fluid flow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional choke valves with circular orifices are used, then flow control is achieved, but erosion and corrosion problems occur due to high shear forces and turbulence
Solution Approach 1:
The patent applies asymmetry by changing the orifice shape from circular to teardrop-shaped. The teardrop shape has a rounded leading edge and a tapered trailing edge, creating asymmetric flow patterns that reduce turbulence and shear forces. This asymmetric geometry allows the fluid to flow more smoothly through the orifice, reducing erosive forces on the choke valve body while maintaining effective flow control capability.
Solution Approach 2:
The patent utilizes curvature by designing the teardrop-shaped orifices with rounded edges and curved surfaces. The rounded leading edge of the teardrop shape allows fluid to transition smoothly into the orifice, reducing turbulence and shear forces. The curved geometry throughout the orifice path minimizes sharp transitions that would create high-velocity jets and turbulence, thereby reducing erosion and corrosion while preserving flow control.
2Ease of operation
If high-pressure fluid flows through conventional choke valves, then production control is achieved, but shear forces and emulsification increase causing equipment failure
Solution Approach 1:
The asymmetric teardrop shape with its rounded leading edge and tapered trailing edge creates a flow path that gradually accelerates and directs fluid, reducing turbulent mixing and emulsification. This asymmetric geometry allows production control while minimizing the harmful shear forces that cause emulsification and equipment failure.
Solution Approach 2:
The curved surfaces of the teardrop-shaped orifices create smooth flow transitions that reduce turbulent mixing. The rounded geometry allows high-pressure fluid to flow through with minimized shear forces and reduced emulsification, while still achieving effective production control through the adjustable orifice alignment.
3Productivity
If multiple holes are aligned in seat carrier and cage insert, then flow rate control is achieved, but complex manufacturing and assembly are required
Solution Approach 1:
The patent applies segmentation by dividing the flow control function into two separate components: the seat carrier with holes and the cage insert with corresponding holes. These segmented components can be manufactured independently using standard drilling and machining processes, then assembled together. The alignment of holes between segments enables flow rate control through adjustable positioning, achieving complex flow regulation through simple modular components.
Solution Approach 2:
The teardrop-shaped orifices serve multiple functions: they control flow rate through alignment adjustment, reduce erosion and corrosion through optimized geometry, and minimize shear forces and emulsification through their asymmetric curved design. This multi-functional design simplifies the overall system by combining several benefits into a single geometric feature, reducing manufacturing and assembly complexity.
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 teardrop-shaped orifice design provides more uniform pressure regulation, reduces turbulence, and decreases erosion and corrosion within the choke valve, leading to improved operational reliability and reduced maintenance costs.
Implementation Method 1
manipulation in shape can result in a reduction of shear force and emulsification of the fluid
Implementation Method 2
The teardrop-shaped orifice design provides more uniform pressure regulation, reduces turbulence
Implementation Method 3
the flow control member can be moved in relation to the orifice in the cage and the seat carrier such that the hole alignment increases or decreases, thereby increasing or decreasing flow volume respectively
Implementation Method 4
the regulation of the pressure passing through the choke valve is regulated more uniformly
Data Source
AI summary
A cage for a choke valve assembly and method for using the same is provided. The cage includes one or more teardrop shaped orifices for the manipulation of fluid flow through the choke valve assembly.