Abstract
Abstract The long-term oil development projects in the Volga-Ural region are associated with depleted reservoirs. TATNEFT fields with 80% reserves depletion level produce 16.2 million tons of oil; fields with 70-80 % reserves depletion produce 4.4 million tons out of 25.8 million tons of total production. Profitable oil production of TATNEFT fields is challenged by highly depleted reservoirs of Romashkinskoye, Bavlinskoye, Sabanchinskoye, Novo-Elkhovskoye, Pervomayskoye, and Bonduzhskoye fields. TATNEFT has developed a suite of technological options for marginal oil field development. 1.Reservoir engineering management, efficient development of depleted fields.Based on the analysis data TATNEFT specialists have selected and approved screening criteria for up to 50 different EOR techniques.Annual incremental oil production due to water-flooding management and application of EOR techniques exceeds 11.6 mln tons, including 5.1 mln tons due to tertiary recovery (about 20% of total production) and 6.5 mln tons due to water-flooding (25%).2.Efficient oil production technologiesChain-drive pumping systems with 3-m and 6-m stroke length have been implemented in TATNEFT assets since 2002, and by the end of 2009, their number totaled to 1113. The systems show maximum efficiency in heavy oil wells and wells with emulsion-related problems, reducing specific energy consumption by up to 60%.Dual-completion systems find wide application in the development of new targets in marginal wells. This paper presents modified dual-completion systems deployed in 533 wells. Incremental oil production due to these systems has exceeded 1 million tons. A dual-injection technology was developed in 2007, and to date dual-injection systems have been deployed in 128 injectors. The new technology yielded 170 200 tons of cumulative incremental oil production.The overall operational benefit is the reduction of specific energy consumption per 1 ton of produced oil. In 2009 it made 119 kwh/ton, which is 4.7% lower as compared to 1998.
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