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ALFA Direct

Wire wrap-on-pipe sand screen

ALFA Direct
DESCRIPTION

AlfaDirect - a robust design of a downhole wire wrap sand screen designed to filter oil and gas from mechanical impurities. This type of screen by characteristics basically corresponds to the AlfaShell screen, but differs in the way the wire wrap screen is manufactured and installed. The sand screen model has tight fit wrap-on-pipe construction. When manufacturing the AlfaDirect screen, the method of direct winding of the V-shaped wire to the base tube with welded elements for fixing the wire is used. This method of manufacturing allows to achieve a compact screen size and high strength of its attachment to the base pipe.

To safely run the liner with sand screens into the hole, the technology of using special caps pressed inside base tube to protect the perforations of the base pipe from premature penetration of the fluid into the well can be applied. After liner installation, the caps are cut with a special tool inside the base tube or removed with hydrochloric acid.

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SPECIFICATIONS:

                    Compact, robust design of sand screen with wrap-on-pipe construction

                    Outer diameter in the range from 60 to 1000 mm

                    Length in the range from 100 to 8000 mm

                    The slot size is from 50 to 2000 μm

                    Product material: stainless steel AISI 304, 321, 316L

APPLICATION:

                    AlfaDirect sand screen is used in oil and gas wells to increase the life of the well and downhole equipment.

                    It is applicable in conditions of variable chemical composition of the extracted fluid, when there is a danger of corrosion and sticking with ferruginous and carbonate sediments, as the filter restores its efficiency after regeneration (washing, acid treatment)

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ADVANTAGES:

                    Large open screen surface (up to 30%) allows increasing the debit of the well and reducing the compression pressure on the surface of the filter.

                    High accuracy of slot size, size tolerances of slotted holes no more than 15 μm 

                    The dense shrinkage of the wire jacket on the base pipe provides an ideal cylindrical shape

                    Heavy-duty filter design. By the level of compressive strength and rupture is not inferior to the casing

                    Stainless steel grade AISI 304, AISI 316 makes the sand screen resistant to corrosion and high temperatures.

                    All forces are transferred to base pipe. And screen and base pipe behave as one unit.

                    The V-shaped profile of the wire contributes to the stability of the filter to the sticking effect, since there is virtually no sticking inside the slot.


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