ABSTRACT
In the present context, a decline in oil production and a steady increase in its costs require a different approach to the selection of type and technological parameters of well killing fluids that provide safe operating conditions for underground repairs and have no negative impact on the filtration properties of the bottomhole formation zone. Practice shows that the most promising solution to this problem is the application of invert emulsion drilling fluids that have become widespread in various branches of the oil industry. In this paper, authors provide a comprehensive methodology of emulsifier selection for the preparation of invert emulsion drilling fluids for designated production well parameters. As compared to previously used emulsifiers, the agents specified in this paper allow not only to improve the characteristics of well killing fluids, but also, other parameters being equal, to reduce the concentration of emulsifier in the final solution and thereby to lower the cost of production well killing.
