Down-hole Sand Separator Velocity and Filter Stages
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Solution Overview
Problem
Petroleum production wells face issues with particulates such as sand and silt causing damage and maintenance problems due to their presence in the production stream, which can lead to leaks, equipment wear, and reduced efficiency, especially with increased fracturing activities.
Innovation Solution
A two-stage particulate separator system comprising a velocity stage with intake slots and a filter stage using a filter medium to separate particulates from the fluid mixture, ensuring downward velocity allows particulates to be captured while the fluid is drawn into the inner tube and filtered, preventing them from reaching the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a velocity stage is used to allow particulates to continue downward with the fluid, then particulates are prevented from damaging equipment, but the device complexity increases due to the two-stage separation system
Solution Approach 1:
The separator is divided into two distinct functional stages: a velocity stage with an outer casing and inner tube that allows fluid and particulates to flow downward, and a filter stage with a filter medium that captures particulates. This segmentation allows each stage to perform its specific function optimally while working together to protect equipment.
Solution Approach 2:
The inner tube is nested within the outer casing in the velocity stage, creating a compact two-stage structure. The filter medium is contained within the filter stage housing. This nesting arrangement reduces overall device complexity while maintaining the necessary functional separation.
2Reliability
If a filter medium is used to filter particulates from the fluid mixture, then particulate removal efficiency increases, but the device complexity and maintenance requirements increase
Solution Approach 1:
The filter medium is contained within a separate filter stage housing that can be accessed independently. This extraction of the filter element from the main flow path allows for easier maintenance and replacement without disrupting the velocity stage operation.
Solution Approach 2:
The filter stage is separated from the velocity stage, with distinct housings and flow paths. This segmentation allows the filter medium to be maintained or replaced independently, reducing overall maintenance complexity.
3Reliability
If the fluid mixture is drawn through a filter medium, then particulate matter is effectively filtered, but the pressure loss increases
Solution Approach 1:
The velocity stage performs preliminary separation by allowing the fluid mixture to flow downward with sufficient velocity to keep particulates suspended. This preliminary action reduces the burden on the filter medium, as larger particulates are already separated before reaching the filter stage.
Solution Approach 2:
By segmenting the separation process into a velocity stage (coarse separation) and a filter stage (fine separation), the pressure drop is distributed across two stages rather than one, reducing the pressure loss at any single point.
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
Effectively prevents particulates from damaging down-hole equipment and surface facilities by ensuring they are captured and filtered out, reducing maintenance costs and extending the life of production equipment.
Implementation Method 1
the fluid mixture reaches a downward velocity sufficient to allow the particulate matter in the fluid mixture to continue downward as the fluid is drawn into the inner tube through the pump intake
Implementation Method 2
passing the fluid mixture through a filter stage wherein the fluid mixture is drawn through a filter medium to filter the particulate matter from the fluid mixture
Data Source
AI summary
A new method separating sand, solids, and produced particulates down-hole in a well producing hydrocarbons. The separation assembly can include ether one, two, or more segments or stages of varying lengths depending upon the individual application. The assembly is installed into the tubing string or delivery conduit of a well producing hydrocarbons. One stage can consist of a velocity chamber whereby separation of particulates occurs by increasing the downward velocity of particulates and reducing the upward velocity of hydrocarbons thereby allowing the particulates to “fall-out” into a lower chamber where the particulates are captured. Another stage can consist of a filter whereby particulates are captured in a chamber that can consist of filtering materials such as gravel, rock, sand, wood, or manmade materials. Each of the stages can be employed individually or in combination.