Physicomechanical Properties of Compositions Based on Butadiene-Nitrile Rubbers after Long-Term Exposure to a Drilling Fluid

The influence of a drilling fluid on the physicomechanical properties of commercial rubbers of two types (RTD-1, RTD-2), which are used as stator coatings for downhole drilling motors, is studied. Prolonged (60 days) contact with a drilling fluid at 25 degrees C is found to increase the stiffness and the coefficient of mechanic loss of rubber. The stability of the properties of RTD-1 rubber during operation in contact with a drilling fluid is shown to be higher than that of RTD-2 rubber. At 80 degrees C, the elastic-hysteresis properties of the rubbers of both types have deteriorated by 30-50%.

Automated summary

The influence of drilling fluid on the physicomechanical properties of commercial rubbers was studied. Prolonged contact with the fluid resulted in increased stiffness and coefficient of mechanic loss of the rubber. It was also found that RTD-1 rubber exhibited higher stability than RTD-2 rubber when in contact with the drilling fluid. At 80 degrees C, the elastic-hysteresis properties of both types of rubber deteriorated by 30-50%.