Experimental Evaluation of Influence of Physico-chemical Properties of Surfactants on Drilling Process in Pay-zones

Despite the global trend for the development and implementation of green energy, petroleum is still the main source of energy in the society. In this regard, the issue of increasing efficiency and reducing the cost of construction and operation of oil and gas wells is still relevant. Drilling into the pay-zone is one of the most important stages of the whole field development. This paper is devoted to the consideration of the possibility of applying the effect of changing the wettability of oil-saturated rock to increase the relative permeability of oil and improve the overall drill-in operation. For this purpose, the authors analyzed international experience in the use of surfactants in technological fluids. Further, a methodology for testing and selection of the most effective surfactant samples using KRUSS DSA 100 tensiometer and regression analysis of the collected data was prepared. As a result of this work, it was found that surfactants can change the wettability of saturated rock in hydrocarbon environment and due to adsorption of surfactant molecules on the surface of saturated rock, the adhesion of hydrocarbons decreases, which leads to an increase in their mobility on the rock surface.