Vol. 337 No. 7 (2026)
DOI https://doi.org/10.18799/24131830/2026/7/5264
System analysis of the results of studying filtration in low-permeability formations of the Priobskoe field
Relevance. It is known that horizontal wells with multi-stage hydraulic fracturing are used in the exploitation of low-permeability productive oil formations in Western Siberia. For example, the development of the best parts of the Priobskoe field (with a confident prediction of the boundaries of the reservoirs, their lithological correlation and a reliable prediction of properties by area) by creation of man-made cracks has been virtually completed. The acquisition of additional oil production is associated with the growing role of “deep-water” reservoirs, which are characterized by the absence of clear differentiation of boundaries by seismic data, insufficient predictability of the properties and boundaries of reservoirs, and sharp lithological and facies variability of rocks. It was established that the efficient exploitation of these zones of low-permeability productive formations AC10 and AC12 is possible only in the case of the implementation of a selective plan for the development of the field. This provides for the selective application of methods taking into account the geology of the developed areas, for example, horizontal wells in which transverse cracks are created, ensuring an increase in the contact area of the wellbore with the productive rock, taking into account the minimum horizontal stress. A number of specialists have reached different conclusions on the same exploitation object. This is due to the fact that tracer and microseismic studies revealed the presence of natural barriers and man-made channels of fluid movement in the formation and that crack development is not proceeding in the design direction. This also was revealed at other fields in Western Siberia. In this regard, a systematic analysis of well hydrodynamic survey data and development results is needed: features of the current state of development and the success of reserves development as a result of the formation of a branched system of man-made channels and cracks. Aim. To ensure the implementation of a selective field development plan that includes the use of technologies that form a spatially heterogeneous drainage zone for horizontal wells. Methods. Analytical and numerical modeling tools, pressure recovery and stabilization curves. Results and conclusions. As a result of computational experiments and calculation of waterflooding efficiency in the absence of impermeable barrier boundaries and isotropic permeability of the formation in the injection zone, it was established that the design value of oil production volume is achieved.
For citation: Bikkulov M.M., Grachev S.I., Semenenko A.F., Gracheva S.K. System analysis of the results of studying filtration in low-permeability formations of the Priobskoe field. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 7, pp. 78-87. https://doi.org/10.18799/24131830/2026/7/5264
Keywords:
filtration, low-permeability formations, displacement coefficient, oil recovery coefficient, longitudinal and transverse hydraulic fracturing cracks, disjunctive faults, productive drainage zone, water flooding
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