East-Messoyakhskoye is a giant oil green field, unique in terms of oil reserves, located in arctic conditions. The main distinctive field characteristic is viscous oil in the cold, unconsolidated reservoir. Understanding all the challenges of developing such reservoirs, a proactive study of polymer flooding began at an early field development stage. A lot of study and research has been done, including the full range of necessary elements. This paper summurises the first pilot project results, gained experience and achievements that allowed us to successfully implement the pilot project, confirm the prospects of polymer flooding technology and lay the foundation for further work.

No abstract

No abstract

The main objective of this paper is to share experience obtained from waterflood implementation in unconsolidated reservoir PK1-3 with heavy oil in East-Messoyakhskoe oil field. Key geological features of PK1-3 reservoir are presented, on which attention should be paid during waterflooding organization in unconsolidated reservoir with heavy oil. Typical effects are described, which are observed during waterflooding of such reservoirs, their analysis is made, based on world experience and actual field results. The history of waterflood implementation from the design and pilot stage to the full-field implementation stage and obtained results are highlighted. Waterflooding strategy and tactics used at this field development stage are described in details: analytical tools, selection and justification of injection pressure, selection of target VRR, individual injection rates selection, investigation program, tactical waterflood management. In addition, proactive actions to improve waterflooding efficiency and field development of PK1-3 reservoir are described. We hope that our experience will be useful to colleagues - reservoir engineers who already started or only plan to start field development with waterflooding of similar fields.

The paper describes the basic features of the East-Messoyahskoe oil field that are important for efficient reservoir development, the key of which are high oil viscosity (111 cP), high heterogenieity and permeability contrast, and the presence of aquifer with a different strength. The review of the experience in proactive breakthrough risks identification is presented. The actual breakthroughs during waterflooding of the PK-13 reservoir of the East-Messoyahskoe oil field are described and analyzed. The backgrounds and regularities increasing the risks of breakthroughs are identified. The analytical calculations have been made and key influencing factors have been defined. Based on the obtained results, the methodology of the proactive breakthrough identification was developed. The methodology has been tested in the real conditions of the East-Messoyahskoe oil field. The first results have been received, which confirm the operational efficiency of the developed methodological approach. All wells were rated according to their breakthrough risk, and measures for operative and proactive breakthroughs risk management has been proposed. All listed are combined into a system which permits minimization of breakthrough risks and manages them for the increase of unconsolidated heavy oil reservoirs development efficiency.