Abstract
At present time, many oil fields, especially in historically developed areas of oil production, such as Western Siberia, characterized by a mature stage of development, accompanied by a high level of watercut of the produced wells while maintaining significant residual oil reserves. In such conditions, it is necessary to provide for the use of various methods aimed at additional recovery of oil reserves. In particular, it is necessary to provide for the use of tertiary impact methods, a significant share of which is occupied by flow- diverting technologies. The meaning of their application lies in the injection of a small amount of chemical reagents aimed at reducing the permeability of water-washed zones by installing a water-insulating barrier in them and redirecting water filtration flows to previously non-flooded reservoir zones. It should be noted that, unlike most methods of increasing oil recovery, in the case of the use of flow-diverting technologies, the flooding agent does not change — both before and after pumping the rim of chemical reagents, water is used as a flooding agent.From an analysis of literary sources and experience in the use of various types of flow-diverting technologies, it follows that one of the most frequently used technologies, with high versatility of action, is the technology of cross-linked polymer systems based on polymers of the acrylamide series. In this connection, this work presents the results of cross-linked polymer systems studies for selected promising development objects of LLC RN-Purneftegaz. Formulations containing polymers in the concentration range from 0.18 to 1.0 % with the addition of 0,018–0,01 % chromium acetate cross-linker were investigated. Additionally, compositions with the addition of bentonite clay powder in an amount of 0.5 wt.% were studied. A study was carried out of solubility, compatibility with water, crosslinkability of compositions,viscosity properties of initial solutions and crosslinked systems based on them. The thermal stability of cross-linked polymer systems was studied at temperatures from 44 ℃ to 95 ℃ and different mineralization. Recommendations for the use of flow-diverting technologies have been developed.
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