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Slotting Blades for Liners and Pipes

Slotting Blades for Liners and Pipes

Slotting  Blades for Liners and Pipes

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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.

Shape Design of Slotted Liner

Trapezoidal design

Reduce the rate of erosion of sewing caused by stream, improve self-cleaning, maintain the slot cavity open, and improve the recovery efficiency.

Shape Design of Slotted Liner


Principle of opting slot width and length for sand control:

Principle of opting slot width and length for sand control

Composite slot design

Také the rate of crudeoil seepage flow, flow resistence and lifetime into account, a combination of various slot. This slot is particularly design for complex reservoirs with different pressures. But the manufacture technology of composite slot is complicated and difficult.

Design of Slot Quantity and Open Area

In the premise of ensuring the intensity of the screen, the slots shall make sure there is sufficient flow area. The effective open area of the slotted liner is the liquid product each day / threshold value of reservoir sensitivity. Generally, open area is 2 % - 6 %.

α = δ Hn/Fs

Note: α – Open area, the valu eis the percentage (%) of slot area accounts for total surface area of liner, δ – Slot width, mm H – Slot length, mm Fs – Outer surface of slotted liner / m, mm2/m n – Number of slots / m, line/m

Slot Distribution Design

Mainly for determine the number of slot, stitching axial distance, type and direction. On the basis of production capacity, the proper slot distribution design will maximize the strength and stability of the slotted liner, and also maximize the economic benefits of slotted liner.

General Slot Distribution:

Slot Distribution Design


Order goods Slotting Blades for Liners and Pipes

Dear customer, you have the opportunity to make a preliminary inquiry to this product. The basket inquiries you can specify your requirements for the product in the table, or you can type in questions for sales representative. Sales representative will contact you as soon as possible.

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Czech Republic
Hlavní 438, Zborovice, 768 32

Phone: +420 573 369 286


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