AlfaCompact
Description
AlfaCompact is a version of a multi-layer mesh sand screen with increased erosion resistance strength. The screen has a three-layer structure. The internal drainage layer of the screen is a perforated casing up to 1.5mm thick with open holes of 6.35mm diameter and spherical recesses (2-3mm) for fitting onto the base pipe. The filtering layer is a spiral laid metal mesh of the reverse dutch weave, cell from 70 microns.
The outer layer of the screen is a casing up to 2 mm thick with slots extruded along the casing surface, the slot size is from 0.3 mm to 1.5 mm. The concave slots are bridged and contribute to an even distribution of fluid in the filter.
The filter uses a double drainage scheme, which increases the filter's permeability, reduces the effect of possible sticking, eliminates the formation of stagnant zones, and also reduces the fluid flow rate and the effect of erosion of the filter surface. AlfaCompact filters are manufactured using the technology of spiral welding of casings. Also, the filter design compression technology is used to minimize the outer diameter of the filter. The filtering layer between the casings is not fixed by welding, but the casings are fastened together by welding with end rings.
The filter belongs to the type of premium filters, since it is a highly durable product with high permeability rates. The filter can be used in a variety of oil and gas well applications including offshore fields.
Characteristics
- Robust compact design of the spiral-welded screen cartridge
- Inner casing from 1.5 mm thick with 6.35 mm perforations and spherical grooves for fixing to base pipe and internal drainage
- A filter layer of a reverse weave metal mesh with a cell of 70 microns, spirally laid in one or two layers
- Outer casing up to 2 mm thick with indented slots with a slot size from 0.3 to 1.5 mm
- Special filter compression technology to reduce the outer diameter of the screen
- Double drainage system that improves fluid distribution uniformity and filter permeability
Usage
Advantages
- High screen strength due to the presence of two welded shrouds
- High open area due to the large open surface of all filter layers and the presence of a double drainage system
- Increased product durability
- High resistance to corrosion and erosion
- Safety during liner running and lifting operations, as well as during transportation
Scheme of the device
