Vibratory Separator Multi-Layer Screening Flow Directors
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Solution Overview
Problem
Current drilling fluid separation systems face issues with fluid loss over the screening surface during increased flow rates, screen clogging due to power fluctuations, and inefficient mesh sizes, leading to unfiltered fluid mixing with filtered fluid and reduced separation efficiency.
Innovation Solution
The system employs a multi-layered screening arrangement with adjustable weirs and flow directors to redirect excess fluid to subsequent screens, preventing loss and ensuring recirculation, and incorporates side dams to maintain fluid flow pathways, optimizing separation efficiency and reducing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flow rate of feed mud is increased, then the productivity of the drilling operation is improved, but the screening surface becomes congested with solids and unfiltered fluid is lost over the front edge
Solution Approach 1:
The patent introduces a vertical dimension by stacking multiple screening surfaces at different heights within the basket. This multi-level arrangement allows unfiltered fluid that would normally overflow the front edge to be redirected downward to lower screening surfaces for additional filtration, thereby maintaining productivity while preventing fluid loss.
Solution Approach 2:
The patent introduces flow directors as intermediary components that actively redirect unfiltered fluid from the front edge area back onto the screening surfaces. These flow directors act as mediators between the overflowing fluid and the screening system, ensuring that fluid is recirculated through the screens rather than being lost.
2Reliability
If the mesh size of the screen is increased to prevent clogging, then the reliability of continuous operation is improved, but the separation precision of fine particles deteriorates
Solution Approach 1:
The patent divides the single-screen system into multiple screening surfaces with different mesh sizes arranged vertically. Upper screens can use larger mesh sizes to handle high flow rates without clogging, while lower screens use finer mesh sizes to achieve precise separation of fine particles, thus resolving the contradiction between reliability and precision.
Solution Approach 2:
Different regions of the screening system are assigned different screen mesh sizes based on local requirements. The upper screening surfaces use coarser meshes for initial filtration at high flow rates, while lower surfaces use finer meshes for precise particle separation, optimizing both reliability and precision in their respective zones.
3Device complexity
If a single screening surface is used, then the device complexity is reduced, but the productivity during high flow rates deteriorates due to screen congestion
Solution Approach 1:
The patent transitions from a single-plane screening arrangement to a multi-level vertical stacking configuration. This three-dimensional arrangement increases the total screening area and allows parallel processing of different flow streams, significantly enhancing productivity while maintaining manageable device complexity through modular construction.
Solution Approach 2:
Multiple screening surfaces are nested vertically within the single basket structure, with each screen positioned at a different height. This nested arrangement maximizes the use of available space, providing increased screening capacity without proportionally increasing the overall device footprint or complexity.
4Loss of substance
If the front end of the separator is raised to prevent fluid loss, then the loss of substance is reduced, but unfiltered fluid drains into the filtered fluid collection area through the gap between basket and housing
Solution Approach 1:
The patent introduces flow directors as intermediary components that actively intercept and redirect unfiltered fluid before it can drain into the filtered fluid collection area. These flow directors guide the fluid back onto the screening surfaces, ensuring proper filtration while maintaining the raised front end configuration.
Solution Approach 2:
The patent extracts the problematic unfiltered fluid stream from the main flow path using flow directors, separating it from the filtered fluid collection area. This extracted fluid is then redirected to the screening surfaces for proper filtration, preventing contamination of the filtered fluid while maintaining productivity.
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
This configuration effectively prevents fluid loss, maintains separation efficiency during power fluctuations, and allows for more desirable mesh sizes, enhancing the quality of filtered drilling fluid and reducing the need for frequent screen replacements.
Implementation Method 1
A vibratory separator is disclosed that effectively prevents fluid loss, maintains separation efficiency during power fluctuations, and allows for more desirable mesh sizes
Data Source
AI summary
An apparatus for separating solids from a drilling fluid that includes a basket having two opposed spaced-apart side walls having first ends and second ends, the first ends spaced apart by an end wall connected to each of the side walls, the basket further including a bottom wall through which a fluid outlet passage is defined, a plurality of screening surfaces having a front edge and a back edge and positioned within the basket between the side walls with each screening surface spaced apart vertically from adjacent screening surfaces and the back edge spaced apart from the end wall of the basket, wherein the back edge of each screening surface is lower than the front edge of the corresponding screening surface, a plurality of weirs, each weir retained along the back edge of a corresponding screening surface and spaced apart from the end wall to define a fluid passage between each weir and the end wall, wherein each weir has a top edge extending to a weir height above the back edge of the corresponding screening surface and the top edge is lower than the front edge of the corresponding screening surface, at least one flow director catching unseparated drilling fluid in the fluid passage and directing the unseparated drilling fluid onto a lower screen, and wherein fluid in the fluid passage between the lowermost screen and the end wall is directed to a spillover fluid outlet is disclosed.