Well Screen Spiral Standoff Layer Burst Strength
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Solution Overview
Problem
Conventional well screens face challenges in maintaining mechanical strength and preventing collapse under excessive well pressures during fluid extraction, as they often have clearances that reduce their effectiveness and increase the risk of filter layer damage.
Innovation Solution
The introduction of a discrete mesh outer standoff layer in a spiral wrap around the filter layer and base pipe minimizes or eliminates clearances, providing compressive force and enhanced mechanical support, thereby increasing the burst strength and resistance to collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clearances are maintained between filter layer and base pipe/protective cover, then ease of assembly is improved, but mechanical strength and resistance to collapse deteriorate
Solution Approach 1:
The discrete mesh outer standoff layer is pre-formed with a configuration that will automatically provide the required clearance when assembled. The spiral wrap design is prepared in advance to engage with the filter layer and base pipe, establishing the optimal gap distance before the well screen is installed in the wellbore.
Solution Approach 2:
The discrete mesh outer standoff layer acts as an intermediary component between the filter layer and the protective cover/base pipe. This intermediate element maintains the necessary clearance while transferring and distributing mechanical loads, thereby protecting the filter layer from direct contact stresses and maintaining structural integrity.
2Ease of manufacture
If filter layer thickness is reduced to lower cost, then manufacturing cost is improved, but mechanical strength and burst resistance deteriorate
Solution Approach 1:
The well screen employs a composite structure combining the filter layer with the discrete mesh outer standoff layer. This composite design allows the filter layer to be thinner and less expensive while the standoff layer provides the additional mechanical strength and burst resistance needed to withstand wellbore pressures.
Solution Approach 2:
The discrete mesh outer standoff layer is pre-formed with a configuration that will automatically provide the required clearance when assembled. The spiral wrap design is prepared in advance to engage with the filter layer and base pipe, establishing the optimal gap distance before the well screen is installed in the wellbore.
3Strength
If clearances are eliminated between filter layer and base pipe, then mechanical strength is improved, but ease of assembly deteriorates
Solution Approach 1:
The discrete mesh outer standoff layer is pre-formed with a configuration that will automatically provide the required clearance when assembled. The spiral wrap design is prepared in advance to engage with the filter layer and base pipe, establishing the optimal gap distance before the well screen is installed in the wellbore.
Solution Approach 2:
The discrete mesh outer standoff layer acts as an intermediary component between the filter layer and the protective cover/base pipe. This intermediate element maintains the necessary clearance while transferring and distributing mechanical loads, thereby protecting the filter layer from direct contact stresses and maintaining structural integrity.
4Strength
If outer standoff layer is added to provide mechanical support, then burst strength is improved, but device complexity increases
Solution Approach 1:
The discrete mesh outer standoff layer is constructed as a flexible yet strong mesh structure that can be spirally wrapped around the filter layer. This thin-film-like approach provides the necessary mechanical strength and burst resistance without adding significant complexity or weight to the overall well screen assembly.
Solution Approach 2:
The outer standoff layer is formed in a spiral wrap configuration that conforms to the cylindrical geometry of the well screen. This curved, spiral design efficiently distributes stresses around the circumference and along the length of the well screen, maximizing mechanical strength while maintaining a relatively simple construction.
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 enhances the mechanical strength and rigidity of the well screen, reducing the thickness and material requirements of the filter layer, while providing higher burst strength and resistance to collapse, thus improving the overall performance during fluid extraction.
Implementation Method 1
a compressive force is produced on the filter layer radially towards the base pipe
Implementation Method 2
the discrete mesh inner standoff layer is in contact with the base pipe. Because clearances between the base pipe and the discrete mesh inner standoff layer may be removed, support may be provided to the filter layer to minimise collapse of the same
Data Source
AI summary
A well screen (101) having a base pipe (103), a filter layer (105) arranged around the base pipe (103), and a discrete mesh outer standoff layer (107) arranged around the filter layer (105) in a first spiral wrap (109) is provided. The first spiral wrap (109) comprises a first succession of loops such that a trailing edge of a next one of the first succession of loops is in contact, or in overlap, with a leading edge of a previous one of the first succession of loops; and to produce a compressive force on the filter layer (105) radially towards the base pipe (103).