Last years there has been a trend in Russia to develop hard-to-recover oil reserves with low-permeability (less than (1-2)⋅10-3 mkm2) and hyper-low-permeable ((0.1-0.001)⋅10-3 mkm2) fields. The latter primarily include Bazhenov, Domanic and Achimov fields. As a result of the extremely low natural filtration properties of these reservoirs, their development at the present stage of technological development provides for the mandatory completion with multiple-fractured horizontal wells (MFHW). Experience in the development of layers of the specified type for Gazprom Neft PJSC shows that the highest oil production rate is achieved if the MFHW system reveals not only the low-permeability rock matrix, but also captures the highly conductive (typically fractured) streaks, that take place in some cases. The difference in the permeability of such highly conductive layers and the hyper-low-permeable matrix of the host rocks can be very significant, for example, up to 105-106. Highly conductive layers in the section associated with the achievement of high initial oil flow rates in new wells, in the process of further development, negative consequences may arise as a result of premature (and even worse – unpredictable) gas and water breakthroughs through narrow fractured layers. The authors dissertate upon how to take into account the risks of loss of well productivity as a consequence of the pronounced geological heterogeneity of these fields, even if the scale of the impact of this heterogeneity is still difficult to assess by modern research methods.
In this regard, this paper analyzes some of the results of core, logging, well-testing and indicator studies with the allocation of characteristic features indicating the presence of local highly conductive layers in the section of the oil complex. In addition, the authors proposed some control solutions to minimize the negative consequences of the development of such heterogeneous fields.
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