Correct estimation of the possible volume of replacement of conventional reservoir structures with compacted sandstones/carbonates in existing fields and production areas is a controversial issue not only in Ukraine but also abroad, due to parametric uncertainty and the impact of formation fluid filtration in unconventional reservoirs. This leads to an overestimation of the forecasted development of compact gas-saturated reservoirs, a decrease in the replacement rate, and an increase in the rate of production decline. Therefore, the aim of the study was to assess the influence of the coefficient of additional filtration resistance, which occurs due to the high rate of upward fluid flow as one of the key uncertain parameters, on the well productivity and the resulting accumulated gas extraction. A multi-stage hydraulic fracturing was performed in a synthetic horizontal well, which was created in the Petrel software. Using typical correlations, the additional resistance coefficients (D-factor) are determined and a hydrodynamic model is constructed in the Eclipse software. Simulations with different values of the D-factor were performed to determine its effect on productivity on accumulated samples for the same type of formations. The results of the study indicate that the revaluation can reach 40%, which is significant when calculating the economic indicators of the feasibility of drilling and conducting multi-stage hydraulic fracturing. The proposed selection and methodology for low-permeability formations encountered in the fields of the Dnipro-Donetsk Basin of Ukraine can be used by gas and oil companies for a detailed analysis of uncertainties and correct planning of stabilisation of the gas production decline
Received 09.01.2024
Revised 17.04.2024
Accepted 31.05.2024
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