Screen Casing

The screen casing structure is composed of two parts: support bars and screen bars. The cross-section of the screen bars is trapezoidal/V-shaped, so the gap is always small outside and large inside, which is very conducive to filtering and flushing. (The opposite is true for the internal liquid inlet) The cross-section of the ribs is wedge-shaped, strip-shaped, or circular. According to the different uses of the user, it can be matched with the screen bars in various ways. It is mainly used for multi-media filtration such as sand control and mud filtration in oil wells, gas wells, and water wells. It can also be used for water treatment, water softening treatment, mid-end filtration of petroleum products, and recovery filtration of organic solutions such as chemical acids. Its function is to filter out impurities and particles from the well wall and formation to ensure the normal operation of the bottom well equipment and pipelines. Most of the screen casings are used for sand control in oil production. Due to the different geology and sand layers of the oil wells, the steel grade and type of the pipes used are different.

Drilled Screen Casing

Base pipe: oil casing, oil pipe, seamless pipe, straight seam pipe
Material: J/K55/N80/L80/P110 carbon steel, stainless steel, alloy steel;
Steel pipe length (single): no more than 20m
Pipe outer diameter: 60---500mm
Wall thickness: no more than 20mm
Hole diameter: 1~30mm
Seam type: round hole
Seam density: any, can be customized according to the customer's flow area
Seam type: parallel, staggered, spiral

Wire Wound Screen Casing

Wire and support strip materials: AIS1304, AIS1304L, AIS1316, AIS1316L
Center base tube: J55, N80, P110 and 13Cr, etc.
Opening area: up to about 60%
Range: 0.1-2.0mm
Length (single): 1.8, 3.0, 6.0, 9.0, 12.0, etc.

Features ⇀ Resistant to acid and alkali corrosion, long life. ⇀ After continuous optimization of the opening design, the large opening design is adopted to make the filtration accuracy and area more precise. Moreover, the small outer gap and the large inner gap make the gap self-cleaning and difficult to block, ensuring the smoothness of fluid filtration, production efficiency and the service life of the filter. ⇀ The minimum width of the opening gap reaches 0.1mm, which can meet the needs of most sand control work underground. Under the same gap accuracy, the flow area is higher and the flow resistance is lower, which is 3 to 5 times that of ordinary slotted screens. ⇀ Mature technology, easy to layer. The wire winding and all ribs are fully welded, and the screen sleeve is supported by a base pipe inside to increase durability and strength and effectively extend the service life. The strength of the central base pipe is only 2-3% lower than that of the original steel pipe.

Screen Casing Processing Method

In the oil extraction industry, screens are common equipment and are widely used in oil production, sand prevention and well completion processes. The most widely used type of screen is wire-wound screen. The manufacturing process of this screen is to evenly wrap the cross-section steel wire around the metal liner and weld it firmly, while leaving a certain gap as the screen hole. However, when used in the well, especially in high-angle wells and horizontal wells, special attention should be paid to avoid extrusion and collision with the well wall or casing. Such collisions may cause the screen wires to become disordered or the gaps to deform, thereby affecting the performance of the screen, reducing the completion quality and sand prevention effect, and even leading to failure.

The traditional processing methods of oil slotted screens are mainly the following:

1.Metal block inlay method: This method uses mechanical processing to open an opening much wider than the predetermined requirement at the slot of the pipe body, and then embeds a narrower metal block into the opening and welds it to form a slot. This method has many processes, low efficiency, high cost, and may affect the strength of the screen.

2.Electrochemical and mechanical processing composite processing method: This method first uses the principle of electrochemical corrosion to etch a blind groove with the same size as the slit on the inner wall of the tube, then uses an ultrasonic thickness gauge to measure the center line of the groove on the outer wall of the tube, and finally uses a milling cutter to mill through the blind groove to form a slit. This method is inefficient, the subsequent cleaning work is arduous, and it is not suitable for mass production.

3.Ceramic blade cutting method: This method uses a ceramic blade to "mill" the slit. Although this method has a certain range of use, it also has some disadvantages, such as low efficiency, high cost, slow blade feed speed and easy damage, requiring frequent replacement, and can only cut simple slit shapes, and cannot cut trapezoidal slits, curved slits and folded line slits.

4.Laser cutting method: This method uses a high-energy-density laser beam to scan the surface of the screen tube and cut out qualified slits based on the basic principles of laser cutting. The advantages of laser cutting include regular slit width, no slag, excellent slit quality, and can cut complex slit shapes such as trapezoidal slits, folded line slits and ultra-wide slits. In addition, laser cutting has low noise, high efficiency and relatively low cost.

Compared with other methods, slotted pipes are gradually being widely used in the field of oil extraction due to their lower price and superior performance.

Advantages Of Screen Tubes

1. This product can be customized with different specifications and materials (mainly stainless steel and carbon steel) according to the actual needs of customers, so as to ensure reasonable investment and save production costs.

2. The screen tube is a non-stainless steel product, which can be galvanized to form a protective layer, with a beautiful and neat appearance.

3. The screen tube has high filtering effect and stable effluent water quality, which can be applied to different raw water quality and water use requirements.

4. The screen tube is widely used in the filtration and matching of industrial water treatment such as make-up water and condensate water in power plant equipment, petroleum, pharmaceutical chemicals, coal, metallurgy, papermaking, food and beverage, beer production, environmental protection and other industries.

5. The screen tube has many advantages and performances, such as strong structure, high temperature and corrosion resistance, good mechanical properties, long service life, safety and reliability, which improves the working efficiency and service life of the filter, making this product a leader in water resource filtration equipment.

6. Reduce pump wear. Under the same conditions, the higher porosity makes the speed of groundwater infiltrating into the filter pipe much slower than that of infiltrating into other filtration devices, thus avoiding sand from entering the filter pipe under greater water pressure and reducing pump wear.

7. Low operating cost, high porosity filter pipe is more conducive to groundwater infiltration. The abundant water volume reduces the depth of water level drop, thereby reducing energy consumption. It is especially suitable for fine sand and silt sand formations in water wells.

screen tubes