Production of reserves of oil- water zones of low-viscosity oil deposits

Abstract

The authors state that during the production there is the process of transition of deposits to the category of bottom water-drive reservoirs due to frontal displacement by the injected water. As a result, the nature of water flooding becomes similar to the primary areas of bottom water-drive reservoirs. It is shown that for water-drive areas, the development is characterized by unfavorably high input values of water flooding and its intensive growth in the range of oil recovery factor from 0.1 to 0.3 fractions of units. The nature of the displacement curves of areas with water-oil zones (WOZ) is identical and differs only by the amount of water flooding of oil reserves in a deposit or area, which allows drawing a conclusion about a similar mechanism of oil displacement, which is characteristic of oil reservoir. It is shown that the main feature that characterizes the development of areas and deposits with water-oil zones is the increase in water flooding at the first stage of production.

Using microbiological technology to increase oil recovery for terrigenous oil deposits

“…The technology of microbiological impact based on DAS (dry activated sludge) developed at BashNIPIneft has been introduced since 1996; 146 well treatments have been carried out on the carbonate reservoirs of the Novouzybashevsky, Volkovsky and Znamensky fields, additional 153.9 thousand tons of oil have been produced (Table 1). The results of the use of activated sludge in the injection wells of the Bobrikov horizon, developed by NGDU Tuimazaneft, are shown in Table 2 [10]. The average efficiency of one treatment is 1.0-1.5 thousand tons of additional oil.…”

Comparison of the effectiveness of flow diverting technologies with hydrodynamic oil recovery improvement methods

“…In [7], a hypothetical reservoir with a porous reservoir type developed by three production wells and one injection well was described. It was assumed that the reservoir is conditionally homogeneous in terms of permeability.…”

Choosing well grid density for low productivity carbonate reservoirs

“…Therefore, it is important to choose an optimal density of the well grid in order to achieve satisfactory technical and economic indicators with the maximum oil recovery. Identification of areas, the drilling of which is not economically viable (due to the low values of recoverable reserves), will allow for more rational use of funds [4][5][6][7].…”