Modelos de velocidad para shales orgánicas de Vaca Muerta calibrados con datos de laboratorioy de pozos
Blanco, Gonzalo Ravazzoli, Claudia L. Soldo, Juan Carlos
Modelos de velocidad para shales orgánicas de Vaca Muerta calibrados con datos de laboratorioy de pozos - 2018 - 17 p. ; 1-18
Unconventional reservoirs have been extensively explored and developed in the last years. These reservoirs are characterized by having very low permeabilities (below 0.1mD) and they need to be hydraulically fractured in order to generate high conductivity channels. Hydraulic stimulations produce an important amount of induced fractures in the reservoir that interact with pre-existing natural fractures. The interaction generates a complex network of fractures that facilitates the flow of hydrocarbons from the rock to the wellbore. One important aspect of this process is the packing of proppants that may keep the fracture open and conductive, during the producing life of the well. However, far from the well, the distribution of proppants is not always efficient and the hydraulic properties of the induced fractures, with very little or even no proppants, can significantly differ from those of the main fractures. There is a great deal of uncertainty about the impact of the unpropped or closely unpropped fracture network on the ultimate recovery of wells. Special conductivity tests are required to mimic the fractures with either very low concentration or noproppants at reservoir conditions, to understand and evaluate the contribution of such ‘far field’ fractures. In this paper, we present results of conductivity tests of fractures with and without proppants, under the influence of stress cycles. The tests were performed on induced fractures of Vaca Muerta formation cores. The results show a clear hysteresis effect with degradation of the fracture conductivity as a function of the applied effective stress. These tests, under realistic conditions, bring substantial information for the analysis of well performance, the definition of draw down protocols and the optimization of the stimulation design.
Física de rocas
Vaca Muerta
No convencionales
068.82 553.28 C62 2018 0015657
Modelos de velocidad para shales orgánicas de Vaca Muerta calibrados con datos de laboratorioy de pozos - 2018 - 17 p. ; 1-18
Unconventional reservoirs have been extensively explored and developed in the last years. These reservoirs are characterized by having very low permeabilities (below 0.1mD) and they need to be hydraulically fractured in order to generate high conductivity channels. Hydraulic stimulations produce an important amount of induced fractures in the reservoir that interact with pre-existing natural fractures. The interaction generates a complex network of fractures that facilitates the flow of hydrocarbons from the rock to the wellbore. One important aspect of this process is the packing of proppants that may keep the fracture open and conductive, during the producing life of the well. However, far from the well, the distribution of proppants is not always efficient and the hydraulic properties of the induced fractures, with very little or even no proppants, can significantly differ from those of the main fractures. There is a great deal of uncertainty about the impact of the unpropped or closely unpropped fracture network on the ultimate recovery of wells. Special conductivity tests are required to mimic the fractures with either very low concentration or noproppants at reservoir conditions, to understand and evaluate the contribution of such ‘far field’ fractures. In this paper, we present results of conductivity tests of fractures with and without proppants, under the influence of stress cycles. The tests were performed on induced fractures of Vaca Muerta formation cores. The results show a clear hysteresis effect with degradation of the fracture conductivity as a function of the applied effective stress. These tests, under realistic conditions, bring substantial information for the analysis of well performance, the definition of draw down protocols and the optimization of the stimulation design.
Física de rocas
Vaca Muerta
No convencionales
068.82 553.28 C62 2018 0015657
