Due to the harsh working conditions of oil wells, many downhole tools bear long-term loads and are used under corroded and worn working conditions, causing them to fail and destroy prematurely, thereby shortening their lifespan. For example: large rotor journals, roulettes, sleeves, bearings, oil drill collars, etc. However, these parts are often very expensive, involving many types of parts, in complex shapes, and with large differences in working conditions. Suspension of production for maintenance and replacement of components not only increases material costs, but also affects oilfield production and brings many losses. Most oil drilling industries choose laser cladding technology to prepare and repair the hard coating in the wear area of large parts. There is no need for preheating, and the subsequent processing volume is small, which shortens the repair cycle and improves the surface hardness and corrosion resistance of the workpiece. And the wear resistance greatly improves the service life of components.
It is used for the rapid preparation of wear-resistant coatings for axisymmetric parts such as shaft journals, sleeve shafts, and wheel discs of impellers and large rotors; due to low heat input and small deformation, it has unique advantages in surface cladding of thin-walled and small-sized parts.
This solution is used for the preparation of wear-resistant hard coatings, erosion-resistant or corrosion-resistant coatings on the inner surface of bearing sleeves, oil drill collars and other parts, rapid repair of local defects on the inner surface, and laser cladding repair of narrow and restricted locations.
This solution is used for the remanufacturing of damaged parts or the manufacture of functional coatings on the surface of new parts. Such as the laser cladding repair of screw wear belts, gates, and wear sleeves.
Application of specific parts:
Laser cladding for inner wall of oil drill collars
In oil, natural gas and geological exploration drilling projects, drill collars are oil drilling tools that are often used in drilling. The quality and service life of drill collars are critical to the economic benefits of the petroleum industry. Therefore, the use of drill collars must ensure the ability of impact resistance, toughness, wear resistance, and corrosion resistance. The laser cladding equipment developed by Senfeng Laser for the inner wall of ultra-long long tubes with a maximum depth of 3000mm and a minimum inner diameter of 80mm, makes it possible and successfully challenges the maximum depth of laser repair of the inner wall of long tubes. The matched high-precision powder-feeding cladding nozzle and endoscopic image monitoring system can complete the precise repair of the damaged area on the inner wall. In the small diameter, long tube drill collar, it can achieve long-term and stable cladding processing and achieve the surface with continuous and even coating without defects after machining. At present, this technology has been successfully applied to oil drill collar repair and remanufactured products, which greatly reduces the product scrap rate and saves a lot of use costs for customers. It has become a major technical highlight in this field.
Laser cladding for dampers
The preparation of surface coatings with both high wear resistance and corrosion resistance has always been a major technical difficulty in the field of laser cladding. Senfeng Laser accurately regulates the powder composition ratio and the coordinated control of the energy of the cladding process, uniformly precipitates the dispersed strengthening phase in the coating structure, improves the wear resistance of the coating while reducing the stress level, and obtains no cracks and pores. The high-quality coating (coating thickness 0.3mm) that is defective and resistant to strong acid corrosion has been successfully applied to the gate products of the flat gate valve. The salt mist test of the actual machine proves that the coating life is more than doubled without cracking and corrosion. The average Vickers hardness of the coating is higher than 800HV0.2.
Screw laser cladding
The screw rotates in the barrel, and the friction between the materials causes the working surface of the screw and the barrel to wear gradually; the diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel increases. In this way, the matching diameter gap between the screw and the barrel increases with the gradual wear of the two, resulting in a decline in production. Laser cladding technology can effectively solve this type of wear problem. Remanufacturing and repairing the wear surface of the screw effectively prolongs the service life of the screw and reduces the use and maintenance costs.
If you are interested in laser cladding technique to repair the part surface of the equipment in oil drilling industry, Senfeng is your best choice. Contact us to get more information.
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