How should oil mud vibrating screen mesh be classified by process?

Oil mud vibrating screen plays an indispensable role in oil drilling operations, and the screen as the core component of the vibrating screen, the selection of its process has a crucial impact on the mud treatment effect and the efficiency of drilling operations. The following will discuss the classification of oil mud vibrating screen mesh process.

 woven screen process

Material selection

1. metal wire woven screen mesh

Stainless steel wire: High-strength stainless steel wire is usually used, such as 304 stainless steel and 316 stainless steel. These stainless steel wires have excellent abrasion and corrosion resistance as well as tensile strength, and are able to maintain stable performance in the harsh oil drilling environment. They are resistant to a wide range of chemicals in the mud and are not easily damaged by the high frequency vibration of the shaker. Special alloy wire: In addition to the common stainless steel wire, some special alloy wires are also used for weaving screens. For example, titanium alloy wire, which has very high strength and corrosion resistance, and even performs well in some extremely harsh environments. However, due to the high cost of titanium alloy, its application is usually limited to some special occasions which require very high performance of screen mesh.

2. Synthetic Fibre Woven Screens

Polyester fibre: Polyester fibre woven screen mesh has many advantages, such as light weight, low cost, corrosion resistance. When dealing with some less corrosive slurry, polyester fibre screen can play a good role. In addition, it is relatively easy to install and replace, which is an important advantage for some drilling operations that require frequent screen replacement. However, polyester fibre has relatively low strength and may be damaged when handling larger particles or high pressure muds. Nylon Fibre: Nylon fibre woven screens offer high strength and abrasion resistance, as well as some corrosion resistance. It has good elasticity, which can play a certain buffer role in the working process of vibrating screen and reduce the wear and tear of screen mesh. Nylon fibre screen mesh is suitable for dealing with some medium particle size and pressure slurry.

 Weaving method

1. Plain weaving characteristics: the warp and weft threads of the screen mesh intertwine with each other to form a flat surface. This kind of weaving makes the pore size of screen mesh uniform, and the filtering effect is better. Due to more interweaving points of the warp and weft threads, the structure of the screen mesh is relatively tight, and it can effectively filter the slurry of fine particles. However, precisely because of the many interweaving points, the strength of the screen is relatively low. When subjected to large external forces, plain weave screen mesh is easy to be deformed or damaged.
2. Twill weaving Characteristics: The interweaving angle of the warp and weft threads is large, forming a certain twill texture. This kind of weaving makes the screen mesh stronger, because the interweaving of warp and weft threads can better disperse the stress. The relatively large pore size of twill weave screens makes them suitable for handling slurries with larger particles. At the same time, the twill texture also makes the screen less likely to be clogged during the filtration process, and the slurry can pass through the screen more smoothly.
3. Dense weaving characteristics: high density weaving, very small pore size, can effectively filter fine particles. The filtration precision of dense weave screen is very high, which can filter out the tiny solid impurities in the slurry, thus greatly improving the quality of the slurry. However, due to the small pore size, the dense woven screen is easy to clog and needs to be cleaned regularly. During the cleaning process, if the operation is not done properly, the structure of the screen mesh may be damaged, affecting its filtering effect.

 Processing technology

1. Welding

For woven wire screen mesh, welding is usually used to fix the screen mesh on the screen frame. Welding can ensure the firmness and stability of the screen mesh, preventing the screen mesh from loosening or falling off during the working process of the vibrating screen. Common welding methods include resistance welding and argon arc welding. RESISTANCE WELDING: Resistance welding is a highly efficient welding method that melts and joins metal wires together through the heat generated by the electric current at the welding site. The welding speed of resistance welding is fast and the welding quality is stable, which is suitable for mass production. In the production of oil slurry vibrating screen mesh, resistance welding can quickly fix the wire woven screen mesh on the screen frame and improve the production efficiency TIG WELDING: TIG welding, on the other hand, is a high-quality welding method, which uses argon gas as a protective gas to prevent the welding parts from being oxidised. Argon arc welding welding quality is high, weld seam beautiful, but the welding speed is relatively slow, high cost.

2. Edging

Synthetic fibre woven screen mesh is generally wrapped to prevent the screen mesh edge wear and loose. Edging materials are usually rubber, plastic or metal. Rubber edging: rubber edging has good elasticity and abrasion resistance, which can effectively buffer the impact of the screen mesh in the vibration process and reduce the wear and tear of the screen mesh edges. In addition, rubber edging also has a certain degree of corrosion resistance, and can maintain stable performance in the slurry environment. Plastic edging: Plastic edging is less expensive and easier to install. However, the abrasion resistance of plastic edging is relatively poor, and it may wear out and break during long-term use. Therefore, plastic cladding is usually used in drilling operations with high cost requirements and low vibration.

Metal cladding: Metal cladding has a high degree of strength and durability, and is effective in protecting screen edges. However, the installation of metal cladding is relatively complex and requires specialised skills and equipment. In some occasions where the strength of the screen mesh is required to be higher, such as drilling operations that handle a large amount of coarse-grained mud, metal cladding can provide better protection for synthetic fibre woven screen mesh.

perforated screen process

Material selection

1. Advantages of stainless steel: Stainless steel perforated screen mesh has good corrosion and abrasion resistance, and can be used for a long time in harsh slurry environment. Stainless steel has higher strength and can withstand greater impact and pressure. In addition, the smooth surface of stainless steel perforated screen is not easy to adhere to the solid impurities in the mud, which is easy to clean and maintain. Application Scenario: It is suitable for various mud environments, especially in the more corrosive mud, stainless steel perforated screen mesh shows excellent performance. For example, on offshore drilling platforms, stainless steel perforated screen mesh is the preferred type of screen mesh due to the strong corrosiveness of seawater. In some high-temperature, high-pressure drilling operations, stainless steel perforated screens can also maintain stable performance to ensure the effective filtration of mud.
2. Advantages of carbon steel: Carbon steel perforated screen mesh is lower cost, with a certain degree of strength and wear resistance. The processing performance of carbon steel is good, and it can be made into various shapes and sizes by stamping and welding. Disadvantages: relatively poor corrosion resistance, easy to rust in the mud. In order to improve the corrosion resistance of carbon steel perforated screen mesh, anti-corrosion treatment can be carried out, such as spraying anti-corrosion paint, galvanised and so on. Application Scenario: Carbon steel perforated screen mesh can be an economical choice in some drilling operations that require high cost. However, it should be noted that regular anti-corrosion maintenance should be carried out in the process of use to prolong the service life of the screen mesh. For example, in some small drilling projects, carbon steel perforated screens can meet the basic requirements of mud filtration, while reducing equipment costs.

Punching method

1. Mechanical punching

Principle: use punching machine and other mechanical equipment to punch the metal plate. Punching machine exerts pressure on the metal sheet through the mould, so that the sheet forms a specific shape and size of the hole under the action of the mould. Characteristics: Mechanical punching has higher precision and regular hole shape, which can meet different filtration requirements. At the same time, mechanical punching has higher production efficiency and is suitable for mass production. However, the mould cost of mechanical punching is higher, and it is more difficult to process some complex shapes of eyelets. Application Scenario: Mechanical punching is a commonly used processing method in occasions that require mass production of standard specification screen mesh. For example, in some large-scale drilling projects, a large number of perforated screens are needed to handle mud, and mechanical punching can quickly and efficiently produce screens that meet the requirements. In addition, mechanical punching can also be used to produce some simple shapes of eyelets, such as round, square, etc., to meet different filtration needs.

2. Principle of laser punching: A laser beam is used to punch holes in metal sheets. Laser punching is a high-precision processing method, which uses the high energy density of laser to melt and evaporate the metal sheet instantly to form the eyelet. Features: Laser punching can achieve high-precision, complex shape eyelet processing without the limitation of moulds. Laser punching is fast and efficient and can meet the individual needs of different customers. In addition, the hole wall of laser punching is smooth and burr-free, which will not cause damage to the solid particles in the slurry. Application Scenario: In some occasions with high requirements for screen mesh holes, such as the need for special shaped holes or high precision filtration requirements, laser perforated screen mesh is an ideal choice. For example, in some high-end drilling equipment, laser perforated screens are needed to ensure the filtration effect of mud and the stability of the equipment. In addition, laser perforation can also be used to produce some small batch, personalised screens to meet the needs of special drilling operations.

 Hole design

1. Circular hole characteristics: circular holes are the most common hole type in perforated screens, which have good filtration effect and strength. The diameter of circular holes can be adjusted according to different filtration requirements, ranging from a few millimetres to tens of millimetres.
2. Features of square holes: square holes have a larger filtering area, which can improve the passing capacity of slurry. The side length of the square hole can be adjusted according to the need, generally between a few millimetres and tens of millimetres.
3. The characteristics of the long bar hole: the long bar hole can improve the open rate of the screen, increase the slurry throughput. The length and width of the bar holes can be adjusted according to different filtration requirements.

 composite screen process

 metal and non-metal composite

1. metal woven screen mesh and synthetic fibre screen mesh composite features: metal woven screen mesh and synthetic fibre screen mesh composite together, you can give full play to the metal screen mesh of high strength and abrasion resistance, as well as synthetic fibre screen mesh corrosion resistance and lightweight. This kind of composite screen mesh has good filtering effect, high strength and long service life.
2. Metal perforated screen mesh and rubber screen mesh composite features: the use of metal perforated screen mesh and rubber screen mesh composite, rubber screen mesh can play a role in damping and noise reduction, while improving the service life of the screen mesh. Rubber screen mesh has better elasticity, which can effectively buffer the impact of slurry on the screen mesh and reduce the wear and tear of the screen mesh.

Different materials metal composite

1. Stainless steel and carbon steel composite screen features: the use of stainless steel corrosion resistance and the strength of carbon steel, stainless steel and carbon steel composite screen made together. This composite screen has the corrosion resistance of stainless steel, but also has the strength and cost advantages of carbon steel.
2. Titanium alloy and stainless steel composite screen features: titanium alloy has very high strength and corrosion resistance, and stainless steel composite can further improve the performance of the screen. This kind of composite screen is suitable for some extreme harsh mud environment, such as high temperature, high pressure, strong corrosive mud.

In summary, the oil mud vibrating screen screen process mainly includes woven screen process, perforated screen process and composite screen process. Different screen processes have their own characteristics and application scenarios, and when choosing the screen process, it is necessary to make comprehensive consideration according to the specific requirements of drilling operations and the characteristics of the mud. Only by choosing the appropriate screen process can we effectively improve the mud treatment effect and ensure the smooth progress of drilling operations.