Russia is one of the main oil producing country in the world with very long history of the oil industry. In one's time in former Soviet Union a lot of attention was paid to oil recovery problems. Unfortunattelly the unfavorable economic climate of the late 1980-s and economic shocks during the period of well-known events in the country in 1990-s caused the rapidly decline of the number of new EOR projects. EOR technologies started to develop in direction of sweep efficiency improvement by cheap agents. Nevetheless by now the very intereresting EOR experience has been accumulated in the country. It is likely that EOR- produced oil in Russia has not already reached its peak level and that it will increase above the current production rates because of improvement of economic situation in the country on the one hand and increasing of mature fields on the other hand. The paper presents an overview of EOR field experiences in former Soviet Union and Russia for the last 25 years, an analysis of recent efforts and discusses briefly on perspectives for conventional and new EOR methods. The main EOR experiences reviewed are chemical flooding (and flow diverting technologies in particular), gas injection, thermal recovery process, microbiological and unconventional EOR. Introduction The problem of enhanced oil recovery is particularly pointed in Russia today: for the last 25–30 years the tendency is from slow to steady decline of the oil recovery factors in the fields. In Fig.1 a dynamics of oil recovery factors over time is presented for the period 1970–2007, derived by averaging the values of oil recovery factors from a significant number of matured fields. The data fields from different regions of Russia had been used for this analysis.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractSteam chamber (SC) control during steam-assisted gravity drainage (SAGD) has a great impact on the efficiency of heavy oil and natural bitumen recovery. An optimal production rate and corresponding bottomhole temperature and pressure should be maintained to improve SAGD cumulative oil recovery and the steam-oil ratio.SAGD optimization work includes simulation results and real-time data monitoring. Existing analytical models 1,2 are mainly dedicated to describing the ability of a reservoir to drain heated oil and do not depict all details of real SAGD processes.In the present work a new analytical model of the SAGD production regime is described. The initial stage of oil production is considered before SC reaches the production well. The model accounts for mass and heat transfer during the process of heavy oil recovery and establishes a significant correlation between production rate and the dynamic of SC evolution. The model that was developed was compared with simulation done by commercial reservoir simulation software. Gravity Drainage RateAccording to Butler's original model 1 , the drainage volumetric rate per one meter of the well length ( d
The results of experimental and theoretical investigations of miscible displacement process of compressible fluids within fractured porous media are reported. On the basis of these studies the fluids miscible filtration mechanism within naturally fractured reservoirs is established.The influence of such factors as reservoir performance, dynamic characteristics of displacement process including displacement rates, the magnitude of rock pressure and rates of its variation on the displacement effectiveness was revealed. The considerations on the efficiency decrease of fluids extraction from fractured porous reservoirs assuming the use of different technological solutions: selection of optimal techniques of wells position, regulation and redistribution of injection rates and production rates of wells, and also cycling pressure variation within rocks are expressed.
Offshore oil-gas and oil-gas-condensate fields with several vertically stacked reservoirs requires a special approach for a choice of strategy their development. It is explained by necessity to solve a multivariate problem of determine of sequence of oil and gas reservoirs development, as well as the construction of facilities for oil and gas gathering and transportation of production from a field.In this paper we describe the principles and workflow of the definition a strategy for development of offshore oil-gas and oil-gas-condensate fields on the initial stage of their exploitation with a limited amount of geological information.The proposed technology for the choice of field development strategy includes four phases: definition of types of production systems for oil and gas recovery under the terms of their applicability to the field condition; selection of production systems for oil and gas reservoirs exploitation on the basis of ensuring a maximal economic effect; estimation of a priority in oil and gas production and recommendations for time input into the development of oil and gas reservoirs in line with the already defined sequence of their development.Implementation of proposed technology is demonstrated on the example of the choice strategy of development of hypothetical offshore oil-gas field.
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