Development of the method for evaluation of effect of drilling fluid surfactants on rocks destruction
Efficiency of hard rocks destruction at a wellbottom mainly depends on their physical-mechanical properties, composition and technical parameters of drilling fluids. The authors of the present paper made an attempt to evaluate influence of some physical properties of water solutions of surfactants on the change of hard rocks physical-mechanical characteristics, followed by development of quantitative evaluation method of circulation fluid weakening effect on drilled rocks. Anionic surfactant research results based on the above-mentioned method are presented. It is stated that anionic surfactants, which are under study now, have high factor of efficiency of hard rocks destruction, but 0,1 % water solution of sodium lauryl sulfate has shown better results. The results of the research revealed the fact that the developed method provides possibility of quantitative evaluation of that or other surfactants influence on destruction efficiency.