During waterflooding of a multilayer oil field there is a constant deterioration of the structure and composition of residual reserves due to geological and technological reasons. The largest share of residual reserves is localized in pillars, which arise from uneven development of the production facility and are undrained or poorly drained zones. The results of a quantitative assessment of the distribution of residual oil reserves in the Middle and Upper Devonian deposits of the Romashkinskoe oil field of the Republic of Tatarstan are presented. A retrospective method is proposed to identify reserves by analyzing and summarizing historical exploration data and the long history of reservoir development, and a calculation algorithm is proposed to quantify them. It has been established that residual oil reserves are localized in rows of dividing and injection wells, as well as in the central rows of producing wells in a three-line drive, in abandoned and piezometric wells, in the areas adjacent to the zones of reservoir confluence, pinch-out, oil-bearing contours, distribution of reservoirs with deteriorated porosity and permeability properties. Depending on geological conditions, algorithms for selecting geological and technical measures to include localized reserves in development and forecasting production profiles were proposed. According to the proposed method, residual recoverable reserves were identified and a number of wells were recommended for experimental works on their additional recovery: in well 16 (hereinafter in the text, conventional well numbers are used) after isolation of overlying high-water-cut formations, the additional perforation was carried out and oil flow was obtained. Additional perforation in well 6 resulted in oil recovery during development as well. Thus, the developed approaches to identifying residual recoverable reserves and patterns of their spatial distribution can be recommended in other multilayer oil fields with a long history of development.
This article deals with the measuring of part of the hardly exploiting oil from the general oil reserves (Heavy Oil).The work includes the study of the specificities of the occurrence of such anomalous viscosities, the effect on structurally formed oil, the given applicable methods, the capacity of reducing the emergence of thixotropic properties of viscous oil. The technique of experimental researches and results of studying the influence of the plasma-pulse action based on the rheological properties of a highly viscous oil deposits is analysed.
In this article the analysis of the current condition of oil recovery at deposits of Russia and the world is presented. The technology of plasma-pulse influence, the operation principle and the basic technical characteristics of equipment are described. The technique of experimental research of the complex technology influence on oil filtration properties of the Usinsk oil deposit is resulted. Results of the filtration research of high-viscous oil in bottom hole formation after plasma-pulse and physical-chemical treatment in various thermobaric conditions are shown.
The article discusses detailed correlation of electrical and radioactive well logging data, mapping of horizontal sections (shears) and studies of optical properties of oil samples. These data were used to design a system of horizontal wells for the development of the Bobrikov and Kizelov deposits.
