Russian Federation
This work is devoted to the development of formulations and the study of the properties of rubber compounds and their vulcanizates based on nitrile-butadiene rubbers intended for elastomeric coatings of screw downhole motor stators, which are widely used in oil and gas production systems for well drilling. A number of operational requirements are imposed on this product, including high tensile strength, tear resistance, wear resistance, heat resistance, elasticity, low-temperature resistance, as well as resistance to drilling fluids and hydrocarbon media. At the same time, special technological properties of rubber compounds are required due to the specific manufacturing method of the coating by pouring onto the heated inner metal surface of the stator. The key technological requirements are low Mooney viscosity and high scorch resistance, which makes it possible to avoid defects during the molding of long-length products. Achieving all these operational and technological requirements simultaneously represents a complex scientific and technical challenge. This study investigated the influence of the rubber base type, including domestic nitrile butadiene rubbers of various grades with different acrylonitrile content and viscosity, as well as their combinations. Various curing systems, types of fillers and their combinations were considered. It was shown that an optimal set of properties is achieved using a combination of rubbers, special accelerators providing a long induction period and fillers that positively affect wear resistance. The developed rubber compounds demonstrate acceptable viscosity, high scorch resistance, and a good level of tensile properties, meeting the requirements for elastomeric coating materials for screw downhole motors. Promising formulations have been selected for further research, which will be studied for resistance to abrasive wear, exposure to aggressive environments, and the strength of rubber-to-metal bonding.
VULCANIZATE, SCREW DOWNHOLE MOTOR, ELASTOMERIC COATING, SCORCH
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