Different systems of stratal flooding by mineral or fresh water into oil bearing formation are used today to enhance reservoir recovery. At low temperatures, 25 degrees below zero and lower, there is a great possibility of freezing of the well head equipment due to cyclic flooding or separate horizontal flooding, lessening injection capacity of the well, emergency stops in flooding, due to water pipe breakage or power cutting off. Besides the wells, crossover bends from water injection wells to the pipe header, and stagnation zones of the embedded in grooves pipes can freeze. According to expert estimation of PJSC "Tatneft" specialists, the amount of frozen injection stations is more than 500 wells per year. Due to the urgency of the issue technological measures have been developed to prevent oil-field equipment freezing.
Based on the generalization of different groups of fields of the terrigenous strata of the lower Cretaceous age of Western Siberia flooding experience, models are obtained that allow to assess the degree of hydrodynamic interaction of producing and injection wells, reflected by the maximum value of the cross-correlation function determined by analyzing the time series of production and injection wells. An algorithm for predicting the values of the cross-correlation function using the geophysical studies of wells and distances between wells data is proposed. It also allows making justifiable management decisions when choosing measures to identify and improve flooding systems in different geological conditions of objects.
The paper deals with the issues of constructing the distribution of pore throats by size for productive strata of Western Siberia at a known value of the coefficient of absolute permeability. It is shown that for this purpose it is possible to use the Brooks-Corey model, which allows approximating the entire set of capillary curves obtained in the laboratory conditions for a particular productive stratum. It is noted that it is possible to estimate parameters of the approximation model with the accuracy sufficient for practical purposes, at known value of absolute permeability of a layer. We obtained analytical expressions that allow us to move from the parameters of the approximation model to the parameters of the distribution of pore channels and sizes. The examples of distribution density for different values of absolute permeability are presented.
Currently, the use of gas methods to increase oil recovery is underexplored. However, the experience of applying these methods, both in Russia and abroad, indicates their high technological and economic efficiency. The article takes the first step towards substantiating the use of gas methods in the conditions of operational facilities in Bashkortostan. The goal of the research was to carry out a forecast of the results of gas exposure on hard-to-recover and residual oil reserves in Bashkortostan fields. The objectives of the research were the creation and adaptation of mathematical models of oil displacement for the conditions of productive objects and the fulfillment of the forecast for an increase in the production of residual oil reserves in the fields. The studies were carried out using models of filtering processes of multicomponent mixtures, a three-dimensional formulation of the problem and complex boundary conditions of polygon objects. The completeness of the generation of residual reserves was calculated. As a result of the research, a mathematical model of gas exposure to hard-torecover and residual oil reserves was adapted to the geological and field conditions of the Volga-Urals, which allowed for a reduction in the volume of calculations. The article presents the results of mathematical modeling of the process of displacing oil from the porous medium of the reservoir rocks of the fields of the Republic of Bashkortostan through the use of gas exposure.
Industrial experiment works (IEW) were carried out to study the mechanism of filtration and reservoir properties changes (FRP) in the process of wells swabbing. Based on the hydrodynamic studies, the results of the works are analyzed. A method for oil production enhancing by reservoirs hydraulic compression has been worked out. In the process of well swabbing the barograms were recorded, pressure recovery curves were taken with the determination of hydraulic conductivity and piezoconductivity values, potential productivity coefficients, well flow rate, reservoir pressure before and after exposure. The interpretation of hydrodynamic studies was carried out by the deterministic analysis with subsequent modeling of the situation. The reservoir, opened by the perforation interval, is of complex structure, as a result of which the liquid was absorbed by the interlayer located above the area with newly formed microcracks. Keywords: hard-to-recover reserves; swabbing; carbonate reservoirs; filtration reservoir properties; pressure recovery curve.
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