Downhole Sand Separator Helical Vortex Guide
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Solution Overview
Problem
Downhole rod pumps in oilfield production face failures due to sand and particulate matter causing wear, sticking, and erosion, leading to reduced efficiency and potential complete failure, with existing sand separators having inefficient designs and metallic components prone to erosion.
Innovation Solution
A downhole sand separator using a thermoplastic sleeve and liner with a vortex guide, forming a helical passage to separate solids through centrifugal forces, eliminating gaps for a 100% seal and maximizing efficiency, and featuring a dump valve for particulate discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior art sand separators reduce fluid velocity to improve separation, then separation efficiency is improved, but pump intake flow rate deteriorates
Solution Approach 1:
The patent employs a curved helical flow path within the separator body that guides fluid in a spiral motion. This curved trajectory enables effective separation of solids from fluid through centrifugal forces while maintaining sufficient flow velocity to preserve pump intake rates, resolving the contradiction between separation efficiency and productivity
Solution Approach 2:
The patent optimizes the flow velocity parameter within the separator to achieve an optimal range that enables effective solid-fluid separation while preventing excessive velocity loss. By carefully controlling this parameter, the system maintains both high separation efficiency and adequate flow rate for pump operation
2Strength
If metallic materials are used in sand separator construction, then structural strength is improved, but erosion resistance deteriorates
Solution Approach 1:
The patent utilizes composite construction with an erosion-resistant liner material (such as polyurethane or rubber) bonded to a structurally strong metallic separator body. This composite approach combines the advantages of both materials: the metal provides structural integrity while the liner protects against sand erosion, resolving the contradiction between strength and erosion resistance
Solution Approach 2:
The erosion-resistant liner is designed as a replaceable component that can be worn and then replaced without replacing the entire separator assembly. This approach protects the main structural body from erosion while providing an economical solution where only the consumable liner needs periodic replacement
3Ease of manufacture
If gaps are left between separator components for assembly, then ease of manufacture is improved, but separation efficiency deteriorates
Solution Approach 1:
The patent employs a flexible liner that can be installed within the rigid separator body, allowing for assembly tolerances and manufacturing variations. The flexible nature of the liner enables it to conform to the separator body interior, eliminating gaps that would reduce separation efficiency while maintaining ease of assembly
Solution Approach 2:
The patent utilizes thermal expansion of the liner material during installation or operation to ensure tight contact with the separator body interior surfaces. The thermal expansion fills any gaps created by manufacturing tolerances, maintaining separation efficiency without requiring precision machining
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 sand and particulate entry into downhole pumps, maintaining pump efficiency and extending its lifespan by removing solids before they reach the pump intake, while the thermoplastic materials resist abrasion and corrosion.
Implementation Method 1
The vortex guide has a helical exterior structure configured to be in engaging contact with the interior surface of the liner member. When so positioned, a single helical passage is formed by the engagement of the helical exterior structure with the interior surface of the liner member.
Implementation Method 2
Sand separators having components fabricated from steel have, by necessity, a gap between the inner diameter of the sleeve and outside diameter of the vortex guide, resulting in a loss of efficiency. However, because the thermoplastics expand in heat, the embodiments of the present invention which utilize thermoplastic for the components had a 100 percent seal between the surfaces of the components, thereby maximizing efficiency.
Data Source
AI summary
A downhole separator separates solids from an inflow of downhole fluid resulting in a cleansed fluid which is directed to the intake of a subsurface pump. The downhole separator has a separator unit which has a sleeve member with a liner member disposed within the sleeve member, the liner member having an exterior surface immediately adjacent the inner surface of the sleeve member. The sleeve member has an opening which is aligned with an opening in the sleeve liner to form an inlet. A vortex guide is disposed inside an inner surface of the liner member. The vortex guide has a helical exterior which is in engaging contact of the inner surface, wherein a single helical passage is formed which extends from the inlet to a second end of the vortex guide.