«Oilfield engineering»

Study of the influence of wells grids density and geological conditions of formation fluids filtration on the efficiency of reserves recovery in the oil fields of the Perm Krai

UDC: 622.276.342
DOI: -

Authors:

¹ Perm National Research Polytechnic University, Perm, Russia

Keywords: well grid density, carbonate reservoir, terrigenous reservoir, current oil recovery factor, accumulated water-liquid ratio, complex parameter, oil viscosity, Kruskal – Wallis criterion, Mann – Whitney criterion

Annotation:

The authors of the article consider the identification and substantiation of correlations between the oil reserves recovery efficiency and the wells grids density as well as geological parameters characterizing the properties of reservoir and formation fluids in conditions of terrigenous and carbonate production objects of the Perm Krai fields, developed with the help of water-flooding. As an indicator of the efficiency of oil reserves recovery there used a complex parameter, which is no less than a ratio of two integral characteristics – the achieved current oil recovery factor and the accumulated water-liquid factor. The initial representative selection of fields data of terrigenous and carbonate reservoirs was differentiated into three groups with statistically significant differences in the mean value of the complex parameter. These groups of data were studied using the well-known methods of nonparametric statistics – the Kruskal – Wallis and Mann – Whitney criteria. The results of the analysis proved the fact that in terrigenous production objects in case of comparable reservoir characteristics and average well grids density of 23...28 hectares per well, the maximum values of the complex parameter are achieved in productive formations due to the greatest oil-saturated thicknesses when filtering the least viscous and resinous oil. It was noted that in carbonate production objects the main direction of work to improve the efficiency of oil reserves recovery is well grids densification, including the conditions of reduced dynamic viscosity of reservoir oil. The obtained results of the analysis of a long-term experience in the development of producing oil fields in the Perm Krai can be used when solving various problems in the field of development design, for example, for selection of objects-analogs and justification of oil recovery factors.

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