Double-layer wire wound (slit) pre-filled screen

The double-layer wire-wound pre-filled screen is mainly composed of a base tube, an inner and outer wire-wound screen, and the annulus of the inner and outer wire-wound screen is filled with high permeability coating sand or fracturing ceramsite sand;

The double-layer slotted pre-filled screen is composed of an inner tube, a sand control filter layer and an outer tube. The inner and outer pipes are slotted liners, and the sand control filter layer is pre-coated gravel or fracturing ceramsite sand to form a pre-filled double-layer screen. Due to the high strength of the screen, it is not easy to be damaged during construction and has a good sand control effect.

Double-layer wire wound pre-filled screen

Performance characteristics:

1. Good sand control effect, especially for silt fine sandstone, excellent sand retaining performance, not easy to block;

2. Corrosion and acid and alkali resistance;

3. High tensile and flexural strength;

4. Long effective period of sand control;

5. Because the resin sand is easy to crack, the impact resistance is poor;

6. The cost of sand control is higher;

7. Largely restricted by the borehole size;

8. It is difficult to detect the density of the finished sand filter tube.

Double-layer slotted pre-filled screen

Performance characteristics:

1. Simple structure,

2. High overall tensile strength,

3. The best combination of the middle filter layer and the inner and outer slotted screens has a good sand control effect and a long sand control period.

4. Wide application range of temperature and pressure, so it can not be restricted by well depth conditions.

5. The surface of the slotted screen is treated with pulse vacuum anti-corrosion nitriding, which can effectively prevent the corrosion of the screen body by various corrosive media such as high salinity salt water, carbon dioxide medium and organic acid, and prolong the service life of the screen.

6. Strong resistance to hydrogen sulfide corrosion.