What materials are used for well screen casing?

Date:2024-05-29Tags:screen casing, well casing, slotted casing

The slotted casing and screen casing in the oil field have the function of sand prevention. screen casing sand prevention is a technology commonly used in oil fields, coal mines, water treatment and other industrial fields. Its main function is to prevent solid particles from entering the fluid to protect pipeline equipment from erosion and wear of sand particles. Because its specific function is more important for the development of oil fields, the selection of raw materials and the production process need to be strictly controlled. The following will introduce in detail the selection of materials and the production process of screen casings.

screen casing

What materials are used to make screen casing?

The selection of materials during the production of screens is very rigorous. Screen casing can be made from different raw materials according to different needs, mainly including: 304 and 316 stainless steel, monel copper-nickel alloy, galvanized or ungalvanized low-carbon steel and thermoplastic materials, mainly polyvinyl chloride and acrylonitrile-butadiene-styrene or alloys thereof. Some other highly specialized materials can be used for water with particularly corrosive properties. The most commonly used one is made of stainless steel, because stainless steel has the characteristics of corrosion resistance, high temperature resistance, wear resistance, etc., which can meet the use requirements in harsh working environments.


Introduction to the manufacturing process of screen casing:

The manufacturing process of wire screen casing includes material cutting, rolling, welding, head processing, surface treatment and other steps. During the manufacturing process, it is necessary to pay attention to maintaining the roundness of the wire screen casing and the firmness of the weld, so that the wire pipe can withstand the impact and wear of the fluid. The screen casing adopts the world's advanced full-wound welding production process, using special trapezoidal wire and triangular wire windings to weld on a group of support wires arranged in a circular manner. The whole process is welded, and the winding wire is connected to the support rod by electric welding, which ensures the strict continuity of the product. The integrity, so that it forms an ideal gap size, and has a large amount of high pressure resistance. The gap opening of the screen casing is formed by the interval continuous winding wire to form the ideal gap size, the whole process is monitored by the computer console operation, and the entire production process is manually supervised. Each production link is produced by professional production personnel using advanced and sophisticated professional installation. The individual slot space of the screen casing can be different during the production process.

Screen casings are usually made through the following steps:

1. Material cutting: First, prepare screen materials of appropriate size, usually stainless steel or plastic materials. According to product requirements and design drafts, use cutting equipment to cut the materials into the required size.

2. Rolling: Roll the cut materials into a tube, usually using special equipment or tools to complete the rolling operation. Ensure that the diameter and length of the tube meet the design requirements.

3. Welding: Weld the rolled tube. Common welding methods include TIG welding, MIG welding, etc. Ensure that the welding is complete and firm so that the screen casing forms a complete structure.

4. Heading processing: Heading processing is performed on both ends of the screen casing, which is generally completed by stamping, welding and other technologies. Ensure that both ends of the screen casings are closed and no screen leaks.

5. Surface treatment: The surface of the screen is treated, generally through polishing, sandblasting and other processes to make the surface smooth and beautiful.

6. Inspection and quality control: The finished screen is inspected for appearance, size measurement, functional performance testing and other inspections, and quality control is performed in accordance with quality standards.

After the above steps, the manufacturing process of the screen casing is completed, and it can be quality tested and put into use.


Screen casing installation process

When installing the screen casing, you need to choose a suitable support structure so that the screen casing can be firmly fixed in the pipeline, pay attention to the connection method between the screen and the well casing, use suitable sealing materials, and there will be no leakage at the connection. Finally, you need to pay attention to the protection measures for the screen casing, such as adding a protective layer on the outside of the screen casing to prevent physical damage and corrosion from the outside.

In practical applications, screen casings are often used in combination with other process technologies to further improve the sand control effect. For example, a filter layer can be set on the outside of the screen casing to filter out particles smaller than a certain particle size, thereby increasing the filtering capacity of the screen casing; in addition, the movement of solid particles can be controlled by adjusting the flow rate and pressure of the fluid to reduce the impact and wear on the screen casing.


In summary, the key to screen casing sand control technology lies in the selection of materials, manufacturing process, installation process and the combination with other technologies. Only when these aspects meet certain requirements and standards can the screen casing be effectively prevented from entering the fluid and the service life and reliability of pipeline equipment be improved.

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