Design and Effect of Fracture-flooding in Class III Oil Reservoirs

doi:10.11885/j.issn.1674-5086.2017.12.25.03

Abstract

Abstract: The efficient exploitation of the Class Ⅲ reservoir in the Daqing Oilfield is necessary for realizing a high and stable yield of oil. To solve the problems encountered in the Sazhong Development Zone, such as the multiple sand body types present, poor physical properties of the reservoir, low recovery, scattered distribution of remaining oil, high adsorption, and the difficulty in chemical flooding during oil extraction, a "fracturing flooding" technique is proposed. In this method, a high-speed channel is formed by a long fracture to quickly deliver high-efficiency oil displacement agents to sites with enriched remaining oil. Filtration loss happens along the way as the channel is formed by fracturing to reduce the contact duration and distance between the chemical agents and strata. Hence, the decrease in the effectiveness of the chemical agents during the injection process is minimized, and their usage efficiency and flooding effect are improved. Field tests show that the injection of oil displacement agents through a fracture is technically possible for the Class Ⅲ reservoir. Satisfactory flooding results are seen in the wells where trial injections are performed. This method could be applied to Sapu Class Ⅲ reservoir and Gaotaizi Class Ⅲ reservoir of the Sazhong Development Zone to realize production and injection enhancement for the rapid tapping of scattered remaining oil in the wells.

Key words: Daqing Oilfield, Class III oil reservoirs, fracture-flooding, alkali and surfactant binary system, remaining oil

CLC Number:

TE312

HE Jingang, WANG Hongwei. Design and Effect of Fracture-flooding in Class III Oil Reservoirs[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 95-104.

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