Search and Argumentation of Decisions Aimed at Increasing the Efficiency of Bottom-Hole Zone Stimulation in Oil Accumulations with Challenged Reserves

Abstract

Abstract The main goal of the work was the algorithms of search creation and solutions justifications aimed at of Jurassic age hard to recover terrigenous deposits of the West Siberian oil and gas province bottom-hole formation zone treatment efficiency increasing with the use of the acidic compounds composition on the basis of the results analysis and in field conditions treatment experience generalization. A total of about 300 impacts on the bottom-hole zone of wells with the use of acid compositions have been carried out. The methods of mathematical statistics and probability theory have been used. The influence of parameters characterizing objects’ geological features, technological features of wells and deposits performance, impact technology on success and impact effectiveness indices were studied. The impact effectiveness was reflected with the help of a complex of seven parameters characterizing the process from different perspectives. When analyzing and generalizing the results, the methods of nonparametric criteria, discriminant and stepwise regression analyses were used, which made it possible to formalize the impact process on the basis of the models obtained. On the basis of the research, a set of algorithms is proposed allowing search and justification of solutions reducing costs significantly and risks when bottom-hole formation zone treatment is being performed. This set of algorithms allows: –to increase the treatments success basing on the established geological and technological conditions for the most successful treatment; scientifically-based wells selection, and treatment parameters regulation;–to predict the technological effect values by absolute and relative incremental oil rate and water cut production decrease, by oil production increase during the impact time; by the comprehensive efficiency parameter;–to justify the wells selection basing on any effectiveness criterion depending on company's tactics and strategy in the market economy environment;–to justify the impact parameters taking into account the deposits’ geological characteristics and objects’ development technologies. The algorithms and techniques involve different volumes of geological information use, depending on its availability, the objects’ development stage and are offered for implementation within the analyzed objects and of the analogous range of objects.