GEOLOGICAL AND PHYSICAL CHARACTERISTICS OF THE FIELD DEVELOPMENT OF UNCONSOLIDATED VISCOUS OIL RESERVOIRS

Abstract

The relevance. The East-Messoyakhskoe field is unique not only in terms of geological reserves, but also in its geological characteristics. Main reservoir PK 1-3 contains about 65 % of the reserves and is an unconsolidated reservoir with a high-viscosity oil. There is practically no experience in development of similar oil fields in the Arctic conditions. The study of geological and physical characteristics of unconsolidated reservoirs with viscous oil is a relevant objective. The main aim of the research is to analyze and identify the key geological and physical characteristics of the field development of unconsolidated viscous oil reservoirs in order to find methods and technologies for improving field development efficiency. Objects of the research are unconsolidated viscous oil reservoir under development of the East- East-Messoyakhskoe field. Methods: critical analysis, content analysis, analysis and generalization of existing experience in the development of unconsolidated viscous oil reservoirs on the example of the PK 1-3 reservoir of the East-Messoyakhskoe field. Results. The authors have carried out the critical analysis of the key geological and physical characteristics of the PK 1-3 reservoir and its fluids research, which must be taken into account in order to develop it with maximum efficiently. The list of key characteristics was made. Their impact on the field development efficiency was shown. The analysis of waterflooding experience and aquifer impact reservoir development was performed. The need for the use of secondary development methods for PK 1-3 reservoir and reservoir pressure maintaining system was proved. However, due to the characteristics described above, the traditional waterflooding of unconsolidated viscous oil reservoirs carries with it high risks of early water breakthrough and poor sweep efficiency, which will have a great impact on the field development efficiency and the final oil recovery factor. It was concluded about the requirement of alternative technologies and flooding agents research, including the application of physico-chemical enhanced oil recovery methods with a systemic approach, which is a relevant and interesting task.

Keywords

• unconsolidated reservoir
• viscous oil
• flooding
• geological and physical characteristics
• field development