Effect Analysis and Recognition of 2-D Black Nano-SHEET in Different Karst Reservoirs in Tahe Oilfield

Abstract

Due to the long-term development of water and gas injection in Tahe Oilfield, the production increase effect decreases year by year. Based on the understanding of the treatment difficulties of water injection and gas injection in the development stage of the fractured vuggy reservoir in Tahe Oilfield, this paper combined with the theoretical analysis of Nano-sheet technology at this stage, such as super amphiphilic interface performance, super emulsification and viscosity reduction ability, ultra-low core adsorption, and super oil washing ability, and has carried out the field application of 2-D black nano-sheet oil displacement in the fractured vuggy reservoir in Tahe Oilfield for a total of 15 wells. Through the oil increase evaluation and comparison of well groups with different inter-well displacement types and different karst reservoir spaces after the application of Nano-sheet, it is found that the well groups with good inter-well connectivity composed of weathered crust underground river karst reservoir space had a high degree of effectiveness. It is the best-selected area for field application. The mine receiving efficiency was as high as 85.7%, and the oil increase is significant, with a cumulative oil increase of more than 5000 tons. It provides practical guidance and a theoretical basis for the follow-up development of 2-D black nano-sheet oil displacement technology in the fractured vuggy reservoir of Tahe Oilfield.