Influence of conditions of the technology applied to level injection profile on the efficiency of multi-layer formations development
The paper, on the basis of numerical simulation, proves the fact that the effectiveness of the injection profile alignment (IPA) of an injection well is highly dependent on the order of the technology application. If there is a low-permeable non-recovered layer in a reservoir section, IPA use should be preceded by the above-said formation shutdown to avoid being hit by plugging agent’s penetration into it. It is shown that, otherwise, the IPA positive effect is of a short time, followed by a significant deterioration of the oil extraction process. For the case discussed, oil losses in the accumulated oil production amounted to 1 % for the entire period of development or 8 % for the period after carrying out of IPA. In case of the address impact (with prior shutdown of a low-permeable layer) decrease of permeability of high-permeable layers leads to a real injection profile alignment of an injection well, thus producing some positive effect on the dynamics of technological parameters of a site development. For the case considered, oil increase in the accumulated oil production made 1,9 % for the whole period of development or 15 % for the period after carrying out of IPA. It is clear that preliminary shutdown of a low-permeable layer increases the cost of the IPA technology use. Economic evaluation of the options considered showed that IPA option with preliminary isolation of a low-permeable layer is preferable.