Research of drilling chemicals influence on the rubber of elastomer bottomhole motor under different temperature conditions

Anton V. Epikhin National Research Tomsk Polytechnic University (TPU) Tomsk, Russian Federation
Viktor P. Shesterov National Research Tomsk Polytechnic University (TPU) Tomsk, Russian Federation  
Maksim I. Gubarev National Research Tomsk Polytechnic University (TPU) Tomsk, Russian Federation  
The study is devoted to the influence of drilling chemicals on characteristics of rubber samples IRP-1226, which are considered to be basic materials for the production of elastomers of a bottomhole motor. The results of the influence of four chemical reagents on the parameters of rubber samples IRP-1226 at different temperatures are introduced in the article. The synergistic effect of drilling chemicals and drill mud temperature on the elastomer of a bottomhole motor was confirmed. The description of the process, occurring in the elastomer, using various drilling chemicals, is presented. Application of the results allows to develop the methodology for improving the service life of elastomers of bottomhole motors.
Materials and methods
We tested samples of rubber IRP-1226 through total immersion in solutions of four chemical reagents of drilling mud. Experiment duration was 360-432 hours. Experimental temperature was from 25 to 85°C.
The effect of biocides and inhibitors of drill mud on the parameters of elastomer samples was proved. The type of mass change and geometrical dimension of the samples has logarithmic character - intensive growth at first base during the experiment is replaced by the slowing. This is due to the evaporation of chemicals and pore bridging of the samples. The most negative impact on the samples, according to experimental data, had the inhibitor SNPH-PKD-515.
Doing further research, tests of samples in solutions of drilling chemicals in various concentrations are planned, for the proper evaluation of their effect on the elastomer of the bottomhole motor during drilling process. Researches in impermeable conditions, allow to minimize the evaporation of chemicals.
Download article
drilling bottomhole motor drill mud elastomer clay inhibitor biocide