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A global trend to introduce enhanced oil recovery (EOR) methods at the early field development stages has been recently observed. Zarubezhneft group is no exception in this regard. Early introduction of EOR methods makes it possible to achieve higher process efficiency, and, first and foremost, economic efficiency. This article describes a pilot project involving implementation of diverter technologies at the field with complex carbonate reservoirs. The following aspects have been reviewed: the structure of the Kharyaga D3-III reservoir, main issues related to the reservoir development and ways to resolve such issues. Laboratory studies of the applied compositions’ properties, as well as filtration experiments have been described. The article also presents an overview of the available diverter technologies. The article also describes field implementation of the operations completed, namely, criteria for interface area selection, injection design development, work progress and efficiency evaluation for the EOR method applied. The operations completed on 5 injectors resulted in around 65 thousand tons of incremental oil from the producers. The operations were found successful; a new program for injection of polymer solution slugs is currently being developed. |
