Slotted Liner

The slotted liner or screen is the mechanical device that contains the gravel-pack sand in an annular ring between it and the casing wall or open hole . Slotted liner is actually a kind of sand control screen, chiefly used as the water and oil reservation layer for sand control. Its major function is to prevent rock pieces dropping into the water or the oil well. This type of slotted product is commonly used in sand control devices, especially useful for horizontal wells.

Working Principle:

The slotted liner screen works by allowing certain particle size coming through the surface with crude oil while keeping the bigger size sand staying outside, and thereby the anti-sand purpose is achieved.
Slotting Patterns: Line slot pattern, staggered slot pattern, multiple staggered slot pattern.

Product Features:

  • The slotted liner is a robust and cost-effective solution for long completions or low productivity wells.
  • We offer slotted liners in wide range of slotting patters to satisfy the requirement for different open area.
  • High rigidity, high intensity, excellent anti-corrosion and even distribution of pressure.

Main Technical Data

  1. Material:

    Stainless steel, carbon steel

  2. Categories of pipes:

    petroleum casing pipe, oil pipe

  3. Length of pipe (single):


  4. Outside diameter of pipe:

    10 to 660mm

  5. OD Tolerance:

    D<50mm,+-0.5mm ,D>50MM,+-1% 

  6. Wall thickness:


  7. Width of slot:


  8. Number of slots:

    Custom made

  9. Distribution types of slots:

    parallel, crisscross, spiral

  10. Distance of slots:

    Custom made

  11. Tensile strength:


  12. Yield Point:

    WT<16MM 245MPA, WT >16-30MM 235MPA

Slotted liners are made from tubulars by saw-cutting slot configurations,  Slot widths are often referred to in terms of gauge. Slot or screen gauge is simply the width of the opening in inches multiplied by 1,000. For instance, a 12-gauge screen has openings of 0.012 in. 
The machining consists of cutting rectangular openings with small rotary saws. Routine slot widths are 0.030 in. or larger. The minimum slot width that can be achieved is about 0.012 in. Slots that cut less than 0.020 in. in width involve high costs because of excessive machine downtime to replace broken saw blades that overheat, warp, and break. 
The single-slot staggered, longitudinal pattern is generally preferred because the strength of the unslotted pipe is preserved. The staggered pattern also gives a more uniform distribution of slots over the surface area of the pipe. The single-slot staggered pattern is slotted with an even number of rows around the pipe with a typical 6-in. longitudinal spacing of slot rows. 


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