Estimation of well drainage radius and reservoir pressure maintenance system efficiency in a tight reservoir by the data obtained by minifrac in the offset horizontal wells with multifrac

Abstract

The low efficiency of classical methods of well testing during the development of hydrocarbon fields with tight and ultra-tight reservoirs forces engineers to use indirect approaches, one of which is the analysis of pressure drop curves during minifrac and main hydraulic fracturing operations to estimate reservoir pressure by the Nolte method. The paper focuses on obtaining a qualitative assessment of reserve recovery for an area of a field with hard-to-recover reserves with the wells arranged linearly and the distance between them of 500 m by estimating the drainage area and the impact of the pressure maintenance system in a reservoir with permeability of 1 mD or less based on restored inter-well reservoir pressure from the Nolte after-closure analysis of falloff data by quantitative and qualitative pore pressure estimations for each of the frac ports in a horizontal well with multifrac.