Slotting Blades for Liners and Pipes
HSS Slotting Blades for production of Slotted Liners
Pipe slotting saw blades are used in multi-spindle milling machines to produce slotted pipe liners for drilling heavy oil. Blades are designed to produce either straight or keystone slots. Most popular O.D. of blades are 3”; 3 ¼”; 3 ½”; 4”. The central hole is usually 1” without keyway. The width of blades (width of slots) is up to instructins of client.
Product description Slotting Blades for Liners and Pipes
Design principle for the slot width of the screen prevent sand movement absolutely
For severely sandy wells (oil, water or gas), it´s better to use the screen with the slot widths are less than or equal to sand size of corresponding formations, which can be used to prevent sand movement absolutely.
δ ≤ 3/2D50
Note: δ – The slot width of the screen D50 – The median diameters of the sand from first sand washing before mining with sand control
Design principal for the slot width of the slotted liner used in bridge technology
The slot width of the screen must be calculated according to the sand size of the sand formation, when the screen without gravel is used in sand control.
δ = 2D10
Note: δ – The slot width of the screen
D10 – The slot width, 90% sand will get through the screen. Illustration: Sand will be prevented from further entering effectively, once a bridge formatted by the sand getting through screen. The formation of bridge is affected by the number of the sand particles, added value of the pair particle diameters is more than or equal to the slot width, and the sand migration pattern. Usually, this kind of screen is used in the wells with some extent sanding, coarse sand particles, smaller separation coefficient and rare workover in horizontal section.
