Известия Томского политехнического университета: Инжиниринг георесурсов (Nov 2017)
Eliminating uncertainties in solving bottom hole zone stimulation tasks
Abstract
Relevance. Bottomhole formation zone treatment experience analysis shows that oil production stimulation operations success on average amounts to 50 %. Alongside with this, there are moments that do not allow interpreting unequivocally success and effectiveness due to the application of different evaluation criteria. These criteria often contradict each other and create uncertainty in the results in terpretation, as a consequence, make it difficult to solve the problem of increasing the effectiveness of bottomhole zone impact. The aim of the research is to eliminate various kinds of uncertainties in the wells and technologies justification and selection, taking in to account the geological and technological features of the development zones. Methods. Based on the canonical discriminant analysis, the experience of various types of oil production stimulation on hard-to-recover terrigenous reservoirs was studied. Results. The authors obtained the apparatus based on the use of canonical discriminant functions equations, the wells groups representation by the treatment types in the axes of these functions, and their confinement areas identification, allowing eliminating a number of uncertainties in solving the tasks of increasing the efficiency of diagnosis and impact on bottomhole zone. Conclusions. The results allow in the analyzed and similar zones conditions: according to the geological and technological parameters determining the belonging of the well to a certain group; to eliminate the «pseudo-effect» influence when estimating the results of impact; to transfer the wells from the «pseudo-effect» zones to the uniquely positive effect zones changing the technological impact parameters; to make a management decision promptly and use the experience in treating the group to which the particular well belongs; to adapt the impact technology to specific geological conditions and address the bottomhole zone impact, taking into account the time factor (development stages).
