Ceramic Screen for Wellbore Sand Control
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Solution Overview
Problem
Existing filters used in well bores, such as wire wrapped steel screens, suffer from high erosion rates and limited flow capacity due to sand particle wear and restricted inflow area, leading to reduced production rates and clogging issues.
Innovation Solution
A ceramic filter, preferably made from boron carbide, is used around sliding sleeve doors with an annular space for fluid flow, providing enhanced durability and acid resistance, allowing for effective sand removal and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wire wrapped steel screens are used as filters, then the filter provides structural strength and initial filtration capability, but the filter suffers from high erosion rates due to sand particle wear
Solution Approach 1:
The patent applies composite materials by combining a metal support structure with a ceramic filter material. The metal tube provides mechanical strength and structural integrity, while the ceramic coating (such as boron carbide, silicon carbide, or aluminum oxide) provides erosion resistance and filtration capability. This composite structure resolves the contradiction by allowing each material to contribute its superior properties.
Solution Approach 2:
The patent changes the material parameter of the filter from traditional metal to ceramic-coated metal. By altering the material composition and applying ceramic coatings with specific hardness and erosion resistance properties, the filter maintains structural strength while significantly improving resistance to sand particle wear and extending service life.
2Device complexity
If traditional screens are used with small inflow area, then the filter material can be simpler in structure, but the maximum flow rate from the well is greatly limited
Solution Approach 1:
The patent employs porous ceramic materials with controlled pore sizes and distributions. These porous structures provide large surface area for filtration while maintaining high flow capacity. The porous nature allows significant increase in active inflow area compared to traditional solid screens, enabling higher production rates without compromising filtration effectiveness.
3Strength
If metal filters are used, then the filter provides good mechanical properties, but the filter cannot be effectively cleaned by acid treatment due to corrosion concerns
Solution Approach 1:
The ceramic-coated metal composite structure allows the underlying metal tube to provide mechanical strength while the ceramic outer layer provides chemical inertness and acid resistance. This enables effective acid cleaning to remove sand and deposits without corroding the filter structure, resolving the contradiction between mechanical properties and acid cleaning capability.
4Manufacturing precision
If the filter pore size is small enough to block particles, then filtration effectiveness is improved, but particles will plug openings and further reduce inflow area
Solution Approach 1:
The patent utilizes porous ceramic materials with carefully controlled pore size distributions. The porous structure provides numerous small pathways for filtration while maintaining overall open structure that prevents particle plugging. The three-dimensional porous network allows particles to be filtered effectively without blocking the entire inflow area, maintaining high productivity.
Solution Approach 2:
The patent transitions from two-dimensional screen surfaces to three-dimensional porous structures. This dimensional change provides vastly increased surface area for filtration within the same footprint, allowing effective particle blocking while maintaining high flow capacity through the volumetric porous structure rather than surface-level openings.
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 ceramic filter minimizes erosion, maintains high flow rates, and allows for acid-based cleaning, reducing particle accumulation and improving well bore fluid extraction efficiency.
Implementation Method 1
a filter arranged external the tubing and covering the sliding sleeve doors, such that the filter prevents particles above a predefined size from entering through the sliding sleeve doors
Implementation Method 2
a supportive tube having apertures allowing well bore fluids to pass, and furthermore said filter is arranged on the inner side of said supportive tube
Data Source
AI summary
A screen assembly for removing particulates from a fluid in a well bore said well bore being provided with a tubing for transport of fluids inside the tube, said tube being provided with sliding sleeve doors through which the fluids flow from the well bore external the tube and into the tube. The screen assembly comprises a filter arranged external the tubing and covering the sliding sleeve doors, such that the filter prevents particles above a predefined size from entering through the sliding sleeve doors: The screen assembly further comprises a supportive tube having apertures allowing well bore fluids to pass. Furthermore said filter is arranged on the inner side of said supportive tube, such that the filter is placed between the supportive tube and the tube with the sliding sleeve doors. The filter is made from ceramic material.