Abstract
Most of the current Russian oil production comes from mature fields. The application of enhanced oil recovery methods on oil fields increases recovery efficiency. This article presents an analysis of the increased field development efficiency methods of the Volga-Ural oil and gas region, which allows the full and efficient development of last-stage fields with unconventional reserves and production stabilization. The selection of the optimum method for a given field is a complex procedure consisting of many stages, from collecting data about the field, through more advanced data interpretation, to working out a detailed proposal for the most efficient extraction method. In this article the instantaneous and average annual growth above wells average was taken as a performance criterion for enhanced oil recovery methods. Based on the performed analysis, it follows that candidate wells for enhanced oil recovery method use must meet the I group parameters (high values of the remaining recoverable reserves and improved reservoir properties, low water cut, obtained oil rate increase). In order to assess the possible increase in production rate after enhanced oil recovery methods hydrodynamic modeling of radial drilling, acid treatment and water-alternated-gas injection for two oil fields of the Volga-Ural oil and gas region were performed.
Highlights
Due to early production of most pay-out beds the oil reserves structure of Russian fields is experiencing negative qualitative changes
In 2008–2012 enhanced oil recovery methods have been actively used on the fields of the East part of the Volga-Ural oil and gas region, among which we can determine 22% hydrodynamic; 25% production intensification methods; 37% physical and 16% chemical approaches [18]
As a result of enhanced oil recovery methods the average increase in daily oil production of unconventional reserve fields amounted to 8.13 t/day
Summary
Due to early production of most pay-out beds the oil reserves structure of Russian fields is experiencing negative qualitative changes. Unconventional oil share is nowadays 60% in total, whereof. Fields related to these regions contain 60% of total Russian reserves of heavy oil (density more than 900 kg/m3). Nowadays the share of heavy oil is more than 23% of the total Russian production, whereof about 50% is produced in the Khanty-Mansiisk autonomous district [1,2]. It is considered that unconventional oil recovery technologies are divided into well, mine and quarry (while producing heavy oil more than 900 kg/m3 and bitumen, Table 1). Existing field development technologies are not efficient and this causes undershoots of high oil recovery factor value [3,4]
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