Selection of components acid composition for the low-permeability clay layers high Bazhenov Formation
During the time, production rate of producing wells and injectability of injectors are reduced. On objects with reserves difficult to recover and non-conventional reserves, this process proceeds more rapidly. This leads to the need to increase or bring up filtration characteristics of bottomhole formation zone to achieve a project targets. In the article the question of selection of special additives in acid composition for improving its quality indicators is considered. Such additives include reducer of boundary tension at the «oil-acid composition" interface, the corrosion inhibitor and iron-stabilizing additive. These components of the acid composition increase its permeability to the reservoir, facilitate the removal of the reaction products of the treated object, reduce the corrosion activity of acids in regards to ground and underground equipment and also prevent the precipitation of difficult and insoluble sediments. The authors carried out a literary analysis on the basis of which a group of laboratory studies was formed to select the optimal components of the acid composition and concentrations of these additives in percentage correlation The studies were navigated using standard methods and modern laboratory equipment. The results obtained showed that of the four surfactants considered, only one of them was able to provide an boundary tension value of less than 1 mN/m. Both for active acid composition and neutralized pH > 5. The authors also compared the manufacturability of corrosion inhibitors, including foreign ones. The best results were shown by the domestic product, which cope with its task by 99 % at a high temperature - 105 °C. The results of the navigated studies showed that a consecutive set of components of acid composition with observance of all necessary requirements leads to the expected positive result.