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- W4297349144 abstract "ABSTRACT: The study presents an analysis of the back-stress effect on precise determination of in-situ stresses in a model samples in laboratory experiments on hydraulic fracturing. Main stage of this study included the determination of the fracture closure pressure using standard methods and comparing this pressure with the minimum loads applied to the sample. The comparison showed the inequality of these values. To eliminate the identified discrepancy, it was proposed to take into account the back-stress effect. This stress occurs due to an increase in pore pressure when fluid is filtrated into the reservoir from a hydraulic fracture. It affects the walls of the fracture, contributing to its closure. The second part of the study was devoted to analysis of back-stress effect impact on estimation of maximum horizontal stress. In this work, we evaluated the influence of this effect on the determination of the minimum and maximum stresses in the medium in laboratory experiments on hydraulic fracturing. Some assumptions about how to account for back-stress in the calculation of minimum stresses were considered. It was found that taking into account the back-stress when calculating the horizontal stresses significantly reduces the difference between the calculated values and experimental data. 1. INTRODUCTION The problem of boundary conditions estimation emerges often when dealing with reservoir geomechanics problems (Zoback, 2007). First of all, contrary to the classical problems of mathematical physics, determination of stress-strain state of rock masses cannot be carried out with boundary conditions postulated at real boundaries of the rock mass, as there are no distinct boundaries constraining the rock mass within a single domain (Mukhamediev, 2015). Information necessary for stress estimation can be obtained only at discrete points – from seismic events analysis or wellbore data. This paper is focused on the latter – the problem of using wellbore data to understand the in-situ stresses at rock mass via estimating stresses existing in the well vicinity." @default.
- W4297349144 created "2022-09-28" @default.
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- W4297349144 date "2022-06-26" @default.
- W4297349144 modified "2023-09-27" @default.
- W4297349144 title "Impact of the Back-Stress Effect on Horizontal Stress Values Calculation in Hydraulic Fracturing Experiments" @default.
- W4297349144 doi "https://doi.org/10.56952/arma-2022-0402" @default.
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